Release 4.11 mm/hugetlb.c
/*
* Generic hugetlb support.
* (C) Nadia Yvette Chambers, April 2004
*/
#include <linux/list.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/sysctl.h>
#include <linux/highmem.h>
#include <linux/mmu_notifier.h>
#include <linux/nodemask.h>
#include <linux/pagemap.h>
#include <linux/mempolicy.h>
#include <linux/compiler.h>
#include <linux/cpuset.h>
#include <linux/mutex.h>
#include <linux/bootmem.h>
#include <linux/sysfs.h>
#include <linux/slab.h>
#include <linux/sched/signal.h>
#include <linux/rmap.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/page-isolation.h>
#include <linux/jhash.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/tlb.h>
#include <linux/io.h>
#include <linux/hugetlb.h>
#include <linux/hugetlb_cgroup.h>
#include <linux/node.h>
#include <linux/userfaultfd_k.h>
#include "internal.h"
int hugepages_treat_as_movable;
int hugetlb_max_hstate __read_mostly;
unsigned int default_hstate_idx;
struct hstate hstates[HUGE_MAX_HSTATE];
/*
* Minimum page order among possible hugepage sizes, set to a proper value
* at boot time.
*/
static unsigned int minimum_order __read_mostly = UINT_MAX;
__initdata LIST_HEAD(huge_boot_pages);
/* for command line parsing */
static struct hstate * __initdata parsed_hstate;
static unsigned long __initdata default_hstate_max_huge_pages;
static unsigned long __initdata default_hstate_size;
static bool __initdata parsed_valid_hugepagesz = true;
/*
* Protects updates to hugepage_freelists, hugepage_activelist, nr_huge_pages,
* free_huge_pages, and surplus_huge_pages.
*/
DEFINE_SPINLOCK(hugetlb_lock);
/*
* Serializes faults on the same logical page. This is used to
* prevent spurious OOMs when the hugepage pool is fully utilized.
*/
static int num_fault_mutexes;
struct mutex *hugetlb_fault_mutex_table ____cacheline_aligned_in_smp;
/* Forward declaration */
static int hugetlb_acct_memory(struct hstate *h, long delta);
static inline void unlock_or_release_subpool(struct hugepage_subpool *spool)
{
bool free = (spool->count == 0) && (spool->used_hpages == 0);
spin_unlock(&spool->lock);
/* If no pages are used, and no other handles to the subpool
* remain, give up any reservations mased on minimum size and
* free the subpool */
if (free) {
if (spool->min_hpages != -1)
hugetlb_acct_memory(spool->hstate,
-spool->min_hpages);
kfree(spool);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Gibson | 48 | 66.67% | 1 | 50.00% |
| Mike Kravetz | 24 | 33.33% | 1 | 50.00% |
| Total | 72 | 100.00% | 2 | 100.00% |
struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
long min_hpages)
{
struct hugepage_subpool *spool;
spool = kzalloc(sizeof(*spool), GFP_KERNEL);
if (!spool)
return NULL;
spin_lock_init(&spool->lock);
spool->count = 1;
spool->max_hpages = max_hpages;
spool->hstate = h;
spool->min_hpages = min_hpages;
if (min_hpages != -1 && hugetlb_acct_memory(h, min_hpages)) {
kfree(spool);
return NULL;
}
spool->rsv_hpages = min_hpages;
return spool;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Gibson | 56 | 51.38% | 1 | 33.33% |
| Mike Kravetz | 53 | 48.62% | 2 | 66.67% |
| Total | 109 | 100.00% | 3 | 100.00% |
void hugepage_put_subpool(struct hugepage_subpool *spool)
{
spin_lock(&spool->lock);
BUG_ON(!spool->count);
spool->count--;
unlock_or_release_subpool(spool);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Gibson | 36 | 100.00% | 1 | 100.00% |
| Total | 36 | 100.00% | 1 | 100.00% |
/*
* Subpool accounting for allocating and reserving pages.
* Return -ENOMEM if there are not enough resources to satisfy the
* the request. Otherwise, return the number of pages by which the
* global pools must be adjusted (upward). The returned value may
* only be different than the passed value (delta) in the case where
* a subpool minimum size must be manitained.
*/
static long hugepage_subpool_get_pages(struct hugepage_subpool *spool,
long delta)
{
long ret = delta;
if (!spool)
return ret;
spin_lock(&spool->lock);
if (spool->max_hpages != -1) { /* maximum size accounting */
if ((spool->used_hpages + delta) <= spool->max_hpages)
spool->used_hpages += delta;
else {
ret = -ENOMEM;
goto unlock_ret;
}
}
/* minimum size accounting */
if (spool->min_hpages != -1 && spool->rsv_hpages) {
if (delta > spool->rsv_hpages) {
/*
* Asking for more reserves than those already taken on
* behalf of subpool. Return difference.
*/
ret = delta - spool->rsv_hpages;
spool->rsv_hpages = 0;
} else {
ret = 0; /* reserves already accounted for */
spool->rsv_hpages -= delta;
}
}
unlock_ret:
spin_unlock(&spool->lock);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 76 | 52.05% | 2 | 66.67% |
| David Gibson | 70 | 47.95% | 1 | 33.33% |
| Total | 146 | 100.00% | 3 | 100.00% |
/*
* Subpool accounting for freeing and unreserving pages.
* Return the number of global page reservations that must be dropped.
* The return value may only be different than the passed value (delta)
* in the case where a subpool minimum size must be maintained.
*/
static long hugepage_subpool_put_pages(struct hugepage_subpool *spool,
long delta)
{
long ret = delta;
if (!spool)
return delta;
spin_lock(&spool->lock);
if (spool->max_hpages != -1) /* maximum size accounting */
spool->used_hpages -= delta;
/* minimum size accounting */
if (spool->min_hpages != -1 && spool->used_hpages < spool->min_hpages) {
if (spool->rsv_hpages + delta <= spool->min_hpages)
ret = 0;
else
ret = spool->rsv_hpages + delta - spool->min_hpages;
spool->rsv_hpages += delta;
if (spool->rsv_hpages > spool->min_hpages)
spool->rsv_hpages = spool->min_hpages;
}
/*
* If hugetlbfs_put_super couldn't free spool due to an outstanding
* quota reference, free it now.
*/
unlock_or_release_subpool(spool);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 96 | 72.18% | 2 | 66.67% |
| David Gibson | 37 | 27.82% | 1 | 33.33% |
| Total | 133 | 100.00% | 3 | 100.00% |
static inline struct hugepage_subpool *subpool_inode(struct inode *inode)
{
return HUGETLBFS_SB(inode->i_sb)->spool;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Gibson | 24 | 100.00% | 1 | 100.00% |
| Total | 24 | 100.00% | 1 | 100.00% |
static inline struct hugepage_subpool *subpool_vma(struct vm_area_struct *vma)
{
return subpool_inode(file_inode(vma->vm_file));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Gibson | 22 | 88.00% | 1 | 50.00% |
| Al Viro | 3 | 12.00% | 1 | 50.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
/*
* Region tracking -- allows tracking of reservations and instantiated pages
* across the pages in a mapping.
*
* The region data structures are embedded into a resv_map and protected
* by a resv_map's lock. The set of regions within the resv_map represent
* reservations for huge pages, or huge pages that have already been
* instantiated within the map. The from and to elements are huge page
* indicies into the associated mapping. from indicates the starting index
* of the region. to represents the first index past the end of the region.
*
* For example, a file region structure with from == 0 and to == 4 represents
* four huge pages in a mapping. It is important to note that the to element
* represents the first element past the end of the region. This is used in
* arithmetic as 4(to) - 0(from) = 4 huge pages in the region.
*
* Interval notation of the form [from, to) will be used to indicate that
* the endpoint from is inclusive and to is exclusive.
*/
struct file_region {
struct list_head link;
long from;
long to;
};
/*
* Add the huge page range represented by [f, t) to the reserve
* map. In the normal case, existing regions will be expanded
* to accommodate the specified range. Sufficient regions should
* exist for expansion due to the previous call to region_chg
* with the same range. However, it is possible that region_del
* could have been called after region_chg and modifed the map
* in such a way that no region exists to be expanded. In this
* case, pull a region descriptor from the cache associated with
* the map and use that for the new range.
*
* Return the number of new huge pages added to the map. This
* number is greater than or equal to zero.
*/
static long region_add(struct resv_map *resv, long f, long t)
{
struct list_head *head = &resv->regions;
struct file_region *rg, *nrg, *trg;
long add = 0;
spin_lock(&resv->lock);
/* Locate the region we are either in or before. */
list_for_each_entry(rg, head, link)
if (f <= rg->to)
break;
/*
* If no region exists which can be expanded to include the
* specified range, the list must have been modified by an
* interleving call to region_del(). Pull a region descriptor
* from the cache and use it for this range.
*/
if (&rg->link == head || t < rg->from) {
VM_BUG_ON(resv->region_cache_count <= 0);
resv->region_cache_count--;
nrg = list_first_entry(&resv->region_cache, struct file_region,
link);
list_del(&nrg->link);
nrg->from = f;
nrg->to = t;
list_add(&nrg->link, rg->link.prev);
add += t - f;
goto out_locked;
}
/* Round our left edge to the current segment if it encloses us. */
if (f > rg->from)
f = rg->from;
/* Check for and consume any regions we now overlap with. */
nrg = rg;
list_for_each_entry_safe(rg, trg, rg->link.prev, link) {
if (&rg->link == head)
break;
if (rg->from > t)
break;
/* If this area reaches higher then extend our area to
* include it completely. If this is not the first area
* which we intend to reuse, free it. */
if (rg->to > t)
t = rg->to;
if (rg != nrg) {
/* Decrement return value by the deleted range.
* Another range will span this area so that by
* end of routine add will be >= zero
*/
add -= (rg->to - rg->from);
list_del(&rg->link);
kfree(rg);
}
}
add += (nrg->from - f); /* Added to beginning of region */
nrg->from = f;
add += t - nrg->to; /* Added to end of region */
nrg->to = t;
out_locked:
resv->adds_in_progress--;
spin_unlock(&resv->lock);
VM_BUG_ON(add < 0);
return add;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 145 | 45.89% | 2 | 33.33% |
| Mike Kravetz | 143 | 45.25% | 2 | 33.33% |
| Davidlohr Bueso A | 16 | 5.06% | 1 | 16.67% |
| JoonSoo Kim | 12 | 3.80% | 1 | 16.67% |
| Total | 316 | 100.00% | 6 | 100.00% |
/*
* Examine the existing reserve map and determine how many
* huge pages in the specified range [f, t) are NOT currently
* represented. This routine is called before a subsequent
* call to region_add that will actually modify the reserve
* map to add the specified range [f, t). region_chg does
* not change the number of huge pages represented by the
* map. However, if the existing regions in the map can not
* be expanded to represent the new range, a new file_region
* structure is added to the map as a placeholder. This is
* so that the subsequent region_add call will have all the
* regions it needs and will not fail.
*
* Upon entry, region_chg will also examine the cache of region descriptors
* associated with the map. If there are not enough descriptors cached, one
* will be allocated for the in progress add operation.
*
* Returns the number of huge pages that need to be added to the existing
* reservation map for the range [f, t). This number is greater or equal to
* zero. -ENOMEM is returned if a new file_region structure or cache entry
* is needed and can not be allocated.
*/
static long region_chg(struct resv_map *resv, long f, long t)
{
struct list_head *head = &resv->regions;
struct file_region *rg, *nrg = NULL;
long chg = 0;
retry:
spin_lock(&resv->lock);
retry_locked:
resv->adds_in_progress++;
/*
* Check for sufficient descriptors in the cache to accommodate
* the number of in progress add operations.
*/
if (resv->adds_in_progress > resv->region_cache_count) {
struct file_region *trg;
VM_BUG_ON(resv->adds_in_progress - resv->region_cache_count > 1);
/* Must drop lock to allocate a new descriptor. */
resv->adds_in_progress--;
spin_unlock(&resv->lock);
trg = kmalloc(sizeof(*trg), GFP_KERNEL);
if (!trg) {
kfree(nrg);
return -ENOMEM;
}
spin_lock(&resv->lock);
list_add(&trg->link, &resv->region_cache);
resv->region_cache_count++;
goto retry_locked;
}
/* Locate the region we are before or in. */
list_for_each_entry(rg, head, link)
if (f <= rg->to)
break;
/* If we are below the current region then a new region is required.
* Subtle, allocate a new region at the position but make it zero
* size such that we can guarantee to record the reservation. */
if (&rg->link == head || t < rg->from) {
if (!nrg) {
resv->adds_in_progress--;
spin_unlock(&resv->lock);
nrg = kmalloc(sizeof(*nrg), GFP_KERNEL);
if (!nrg)
return -ENOMEM;
nrg->from = f;
nrg->to = f;
INIT_LIST_HEAD(&nrg->link);
goto retry;
}
list_add(&nrg->link, rg->link.prev);
chg = t - f;
goto out_nrg;
}
/* Round our left edge to the current segment if it encloses us. */
if (f > rg->from)
f = rg->from;
chg = t - f;
/* Check for and consume any regions we now overlap with. */
list_for_each_entry(rg, rg->link.prev, link) {
if (&rg->link == head)
break;
if (rg->from > t)
goto out;
/* We overlap with this area, if it extends further than
* us then we must extend ourselves. Account for its
* existing reservation. */
if (rg->to > t) {
chg += rg->to - t;
t = rg->to;
}
chg -= rg->to - rg->from;
}
out:
spin_unlock(&resv->lock);
/* We already know we raced and no longer need the new region */
kfree(nrg);
return chg;
out_nrg:
spin_unlock(&resv->lock);
return chg;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 210 | 51.72% | 2 | 28.57% |
| Mike Kravetz | 115 | 28.33% | 2 | 28.57% |
| Davidlohr Bueso A | 68 | 16.75% | 1 | 14.29% |
| JoonSoo Kim | 12 | 2.96% | 1 | 14.29% |
| Lucas De Marchi | 1 | 0.25% | 1 | 14.29% |
| Total | 406 | 100.00% | 7 | 100.00% |
/*
* Abort the in progress add operation. The adds_in_progress field
* of the resv_map keeps track of the operations in progress between
* calls to region_chg and region_add. Operations are sometimes
* aborted after the call to region_chg. In such cases, region_abort
* is called to decrement the adds_in_progress counter.
*
* NOTE: The range arguments [f, t) are not needed or used in this
* routine. They are kept to make reading the calling code easier as
* arguments will match the associated region_chg call.
*/
static void region_abort(struct resv_map *resv, long f, long t)
{
spin_lock(&resv->lock);
VM_BUG_ON(!resv->region_cache_count);
resv->adds_in_progress--;
spin_unlock(&resv->lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 46 | 100.00% | 1 | 100.00% |
| Total | 46 | 100.00% | 1 | 100.00% |
/*
* Delete the specified range [f, t) from the reserve map. If the
* t parameter is LONG_MAX, this indicates that ALL regions after f
* should be deleted. Locate the regions which intersect [f, t)
* and either trim, delete or split the existing regions.
*
* Returns the number of huge pages deleted from the reserve map.
* In the normal case, the return value is zero or more. In the
* case where a region must be split, a new region descriptor must
* be allocated. If the allocation fails, -ENOMEM will be returned.
* NOTE: If the parameter t == LONG_MAX, then we will never split
* a region and possibly return -ENOMEM. Callers specifying
* t == LONG_MAX do not need to check for -ENOMEM error.
*/
static long region_del(struct resv_map *resv, long f, long t)
{
struct list_head *head = &resv->regions;
struct file_region *rg, *trg;
struct file_region *nrg = NULL;
long del = 0;
retry:
spin_lock(&resv->lock);
list_for_each_entry_safe(rg, trg, head, link) {
/*
* Skip regions before the range to be deleted. file_region
* ranges are normally of the form [from, to). However, there
* may be a "placeholder" entry in the map which is of the form
* (from, to) with from == to. Check for placeholder entries
* at the beginning of the range to be deleted.
*/
if (rg->to <= f && (rg->to != rg->from || rg->to != f))
continue;
if (rg->from >= t)
break;
if (f > rg->from && t < rg->to) { /* Must split region */
/*
* Check for an entry in the cache before dropping
* lock and attempting allocation.
*/
if (!nrg &&
resv->region_cache_count > resv->adds_in_progress) {
nrg = list_first_entry(&resv->region_cache,
struct file_region,
link);
list_del(&nrg->link);
resv->region_cache_count--;
}
if (!nrg) {
spin_unlock(&resv->lock);
nrg = kmalloc(sizeof(*nrg), GFP_KERNEL);
if (!nrg)
return -ENOMEM;
goto retry;
}
del += t - f;
/* New entry for end of split region */
nrg->from = t;
nrg->to = rg->to;
INIT_LIST_HEAD(&nrg->link);
/* Original entry is trimmed */
rg->to = f;
list_add(&nrg->link, &rg->link);
nrg = NULL;
break;
}
if (f <= rg->from && t >= rg->to) { /* Remove entire region */
del += rg->to - rg->from;
list_del(&rg->link);
kfree(rg);
continue;
}
if (f <= rg->from) { /* Trim beginning of region */
del += t - rg->from;
rg->from = t;
} else { /* Trim end of region */
del += rg->to - f;
rg->to = f;
}
}
spin_unlock(&resv->lock);
kfree(nrg);
return del;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 234 | 65.18% | 2 | 25.00% |
| Andy Whitcroft | 79 | 22.01% | 2 | 25.00% |
| Mel Gorman | 18 | 5.01% | 2 | 25.00% |
| Davidlohr Bueso A | 16 | 4.46% | 1 | 12.50% |
| JoonSoo Kim | 12 | 3.34% | 1 | 12.50% |
| Total | 359 | 100.00% | 8 | 100.00% |
/*
* A rare out of memory error was encountered which prevented removal of
* the reserve map region for a page. The huge page itself was free'ed
* and removed from the page cache. This routine will adjust the subpool
* usage count, and the global reserve count if needed. By incrementing
* these counts, the reserve map entry which could not be deleted will
* appear as a "reserved" entry instead of simply dangling with incorrect
* counts.
*/
void hugetlb_fix_reserve_counts(struct inode *inode)
{
struct hugepage_subpool *spool = subpool_inode(inode);
long rsv_adjust;
rsv_adjust = hugepage_subpool_get_pages(spool, 1);
if (rsv_adjust) {
struct hstate *h = hstate_inode(inode);
hugetlb_acct_memory(h, 1);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 55 | 100.00% | 1 | 100.00% |
| Total | 55 | 100.00% | 1 | 100.00% |
/*
* Count and return the number of huge pages in the reserve map
* that intersect with the range [f, t).
*/
static long region_count(struct resv_map *resv, long f, long t)
{
struct list_head *head = &resv->regions;
struct file_region *rg;
long chg = 0;
spin_lock(&resv->lock);
/* Locate each segment we overlap with, and count that overlap. */
list_for_each_entry(rg, head, link) {
long seg_from;
long seg_to;
if (rg->to <= f)
continue;
if (rg->from >= t)
break;
seg_from = max(rg->from, f);
seg_to = min(rg->to, t);
chg += seg_to - seg_from;
}
spin_unlock(&resv->lock);
return chg;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 89 | 74.79% | 1 | 25.00% |
| Davidlohr Bueso A | 16 | 13.45% | 1 | 25.00% |
| JoonSoo Kim | 12 | 10.08% | 1 | 25.00% |
| Wang Sheng-Hui | 2 | 1.68% | 1 | 25.00% |
| Total | 119 | 100.00% | 4 | 100.00% |
/*
* Convert the address within this vma to the page offset within
* the mapping, in pagecache page units; huge pages here.
*/
static pgoff_t vma_hugecache_offset(struct hstate *h,
struct vm_area_struct *vma, unsigned long address)
{
return ((address - vma->vm_start) >> huge_page_shift(h)) +
(vma->vm_pgoff >> huge_page_order(h));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mel Gorman | 17 | 36.17% | 2 | 40.00% |
| Andy Whitcroft | 16 | 34.04% | 1 | 20.00% |
| Andi Kleen | 13 | 27.66% | 1 | 20.00% |
| Johannes Weiner | 1 | 2.13% | 1 | 20.00% |
| Total | 47 | 100.00% | 5 | 100.00% |
pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
unsigned long address)
{
return vma_hugecache_offset(hstate_vma(vma), vma, address);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 27 | 100.00% | 1 | 100.00% |
| Total | 27 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(linear_hugepage_index);
/*
* Return the size of the pages allocated when backing a VMA. In the majority
* cases this will be same size as used by the page table entries.
*/
unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
{
struct hstate *hstate;
if (!is_vm_hugetlb_page(vma))
return PAGE_SIZE;
hstate = hstate_vma(vma);
return 1UL << huge_page_shift(hstate);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mel Gorman | 39 | 92.86% | 1 | 50.00% |
| Wanpeng Li | 3 | 7.14% | 1 | 50.00% |
| Total | 42 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(vma_kernel_pagesize);
/*
* Return the page size being used by the MMU to back a VMA. In the majority
* of cases, the page size used by the kernel matches the MMU size. On
* architectures where it differs, an architecture-specific version of this
* function is required.
*/
#ifndef vma_mmu_pagesize
unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
{
return vma_kernel_pagesize(vma);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mel Gorman | 17 | 100.00% | 1 | 100.00% |
| Total | 17 | 100.00% | 1 | 100.00% |
#endif
/*
* Flags for MAP_PRIVATE reservations. These are stored in the bottom
* bits of the reservation map pointer, which are always clear due to
* alignment.
*/
#define HPAGE_RESV_OWNER (1UL << 0)
#define HPAGE_RESV_UNMAPPED (1UL << 1)
#define HPAGE_RESV_MASK (HPAGE_RESV_OWNER | HPAGE_RESV_UNMAPPED)
/*
* These helpers are used to track how many pages are reserved for
* faults in a MAP_PRIVATE mapping. Only the process that called mmap()
* is guaranteed to have their future faults succeed.
*
* With the exception of reset_vma_resv_huge_pages() which is called at fork(),
* the reserve counters are updated with the hugetlb_lock held. It is safe
* to reset the VMA at fork() time as it is not in use yet and there is no
* chance of the global counters getting corrupted as a result of the values.
*
* The private mapping reservation is represented in a subtly different
* manner to a shared mapping. A shared mapping has a region map associated
* with the underlying file, this region map represents the backing file
* pages which have ever had a reservation assigned which this persists even
* after the page is instantiated. A private mapping has a region map
* associated with the original mmap which is attached to all VMAs which
* reference it, this region map represents those offsets which have consumed
* reservation ie. where pages have been instantiated.
*/
static unsigned long get_vma_private_data(struct vm_area_struct *vma)
{
return (unsigned long)vma->vm_private_data;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mel Gorman | 15 | 71.43% | 2 | 66.67% |
| Andy Whitcroft | 6 | 28.57% | 1 | 33.33% |
| Total | 21 | 100.00% | 3 | 100.00% |
static void set_vma_private_data(struct vm_area_struct *vma,
unsigned long value)
{
vma->vm_private_data = (void *)value;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 13 | 52.00% | 1 | 50.00% |
| Mel Gorman | 12 | 48.00% | 1 | 50.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
struct resv_map *resv_map_alloc(void)
{
struct resv_map *resv_map = kmalloc(sizeof(*resv_map), GFP_KERNEL);
struct file_region *rg = kmalloc(sizeof(*rg), GFP_KERNEL);
if (!resv_map || !rg) {
kfree(resv_map);
kfree(rg);
return NULL;
}
kref_init(&resv_map->refs);
spin_lock_init(&resv_map->lock);
INIT_LIST_HEAD(&resv_map->regions);
resv_map->adds_in_progress = 0;
INIT_LIST_HEAD(&resv_map->region_cache);
list_add(&rg->link, &resv_map->region_cache);
resv_map->region_cache_count = 1;
return resv_map;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 64 | 51.61% | 1 | 33.33% |
| Andy Whitcroft | 52 | 41.94% | 1 | 33.33% |
| Davidlohr Bueso A | 8 | 6.45% | 1 | 33.33% |
| Total | 124 | 100.00% | 3 | 100.00% |
void resv_map_release(struct kref *ref)
{
struct resv_map *resv_map = container_of(ref, struct resv_map, refs);
struct list_head *head = &resv_map->region_cache;
struct file_region *rg, *trg;
/* Clear out any active regions before we release the map. */
region_del(resv_map, 0, LONG_MAX);
/* ... and any entries left in the cache */
list_for_each_entry_safe(rg, trg, head, link) {
list_del(&rg->link);
kfree(rg);
}
VM_BUG_ON(resv_map->adds_in_progress);
kfree(resv_map);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 54 | 59.34% | 2 | 66.67% |
| Andy Whitcroft | 37 | 40.66% | 1 | 33.33% |
| Total | 91 | 100.00% | 3 | 100.00% |
static inline struct resv_map *inode_resv_map(struct inode *inode)
{
return inode->i_mapping->private_data;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| JoonSoo Kim | 21 | 100.00% | 1 | 100.00% |
| Total | 21 | 100.00% | 1 | 100.00% |
static struct resv_map *vma_resv_map(struct vm_area_struct *vma)
{
VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma);
if (vma->vm_flags & VM_MAYSHARE) {
struct address_space *mapping = vma->vm_file->f_mapping;
struct inode *inode = mapping->host;
return inode_resv_map(inode);
} else {
return (struct resv_map *)(get_vma_private_data(vma) &
~HPAGE_RESV_MASK);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| JoonSoo Kim | 31 | 39.24% | 1 | 16.67% |
| Mel Gorman | 29 | 36.71% | 2 | 33.33% |
| Andy Whitcroft | 16 | 20.25% | 2 | 33.33% |
| Sasha Levin | 3 | 3.80% | 1 | 16.67% |
| Total | 79 | 100.00% | 6 | 100.00% |
static void set_vma_resv_map(struct vm_area_struct *vma, struct resv_map *map)
{
VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma);
VM_BUG_ON_VMA(vma->vm_flags & VM_MAYSHARE, vma);
set_vma_private_data(vma, (get_vma_private_data(vma) &
HPAGE_RESV_MASK) | (unsigned long)map);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 36 | 62.07% | 2 | 40.00% |
| David Gibson | 15 | 25.86% | 1 | 20.00% |
| Sasha Levin | 6 | 10.34% | 1 | 20.00% |
| Mel Gorman | 1 | 1.72% | 1 | 20.00% |
| Total | 58 | 100.00% | 5 | 100.00% |
static void set_vma_resv_flags(struct vm_area_struct *vma, unsigned long flags)
{
VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma);
VM_BUG_ON_VMA(vma->vm_flags & VM_MAYSHARE, vma);
set_vma_private_data(vma, get_vma_private_data(vma) | flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 22 | 44.90% | 1 | 14.29% |
| David Gibson | 12 | 24.49% | 1 | 14.29% |
| Sasha Levin | 6 | 12.24% | 1 | 14.29% |
| Andrew Morton | 5 | 10.20% | 1 | 14.29% |
| Kenneth W. Chen | 2 | 4.08% | 1 | 14.29% |
| Mel Gorman | 1 | 2.04% | 1 | 14.29% |
| Atsushi Nemoto | 1 | 2.04% | 1 | 14.29% |
| Total | 49 | 100.00% | 7 | 100.00% |
static int is_vma_resv_set(struct vm_area_struct *vma, unsigned long flag)
{
VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma);
return (get_vma_private_data(vma) & flag) != 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 21 | 55.26% | 1 | 25.00% |
| Nishanth Aravamudan | 13 | 34.21% | 1 | 25.00% |
| Sasha Levin | 3 | 7.89% | 1 | 25.00% |
| Andrew Morton | 1 | 2.63% | 1 | 25.00% |
| Total | 38 | 100.00% | 4 | 100.00% |
/* Reset counters to 0 and clear all HPAGE_RESV_* flags */
void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma);
if (!(vma->vm_flags & VM_MAYSHARE))
vma->vm_private_data = (void *)0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 23 | 54.76% | 1 | 14.29% |
| Andrew Morton | 7 | 16.67% | 1 | 14.29% |
| Mel Gorman | 5 | 11.90% | 2 | 28.57% |
| Christoph Lameter | 4 | 9.52% | 2 | 28.57% |
| Sasha Levin | 3 | 7.14% | 1 | 14.29% |
| Total | 42 | 100.00% | 7 | 100.00% |
/* Returns true if the VMA has associated reserve pages */
static bool vma_has_reserves(struct vm_area_struct *vma, long chg)
{
if (vma->vm_flags & VM_NORESERVE) {
/*
* This address is already reserved by other process(chg == 0),
* so, we should decrement reserved count. Without decrementing,
* reserve count remains after releasing inode, because this
* allocated page will go into page cache and is regarded as
* coming from reserved pool in releasing step. Currently, we
* don't have any other solution to deal with this situation
* properly, so add work-around here.
*/
if (vma->vm_flags & VM_MAYSHARE && chg == 0)
return true;
else
return false;
}
/* Shared mappings always use reserves */
if (vma->vm_flags & VM_MAYSHARE) {
/*
* We know VM_NORESERVE is not set. Therefore, there SHOULD
* be a region map for all pages. The only situation where
* there is no region map is if a hole was punched via
* fallocate. In this case, there really are no reverves to
* use. This situation is indicated if chg != 0.
*/
if (chg)
return false;
else
return true;
}
/*
* Only the process that called mmap() has reserves for
* private mappings.
*/
if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
/*
* Like the shared case above, a hole punch or truncate
* could have been performed on the private mapping.
* Examine the value of chg to determine if reserves
* actually exist or were previously consumed.
* Very Subtle - The value of chg comes from a previous
* call to vma_needs_reserves(). The reserve map for
* private mappings has different (opposite) semantics
* than that of shared mappings. vma_needs_reserves()
* has already taken this difference in semantics into
* account. Therefore, the meaning of chg is the same
* as in the shared case above. Code could easily be
* combined, but keeping it separate draws attention to
* subtle differences.
*/
if (chg)
return false;
else
return true;
}
return false;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| JoonSoo Kim | 33 | 35.11% | 3 | 21.43% |
| Andy Whitcroft | 22 | 23.40% | 2 | 14.29% |
| Mike Kravetz | 22 | 23.40% | 2 | 14.29% |
| Nicholas Krause | 6 | 6.38% | 1 | 7.14% |
| Mel Gorman | 6 | 6.38% | 4 | 28.57% |
| Andrew Morton | 4 | 4.26% | 1 | 7.14% |
| Adam Litke | 1 | 1.06% | 1 | 7.14% |
| Total | 94 | 100.00% | 14 | 100.00% |
static void enqueue_huge_page(struct hstate *h, struct page *page)
{
int nid = page_to_nid(page);
list_move(&page->lru, &h->hugepage_freelists[nid]);
h->free_huge_pages++;
h->free_huge_pages_node[nid]++;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 30 | 56.60% | 1 | 25.00% |
| Andi Kleen | 11 | 20.75% | 1 | 25.00% |
| Adam Litke | 11 | 20.75% | 1 | 25.00% |
| Aneesh Kumar K.V | 1 | 1.89% | 1 | 25.00% |
| Total | 53 | 100.00% | 4 | 100.00% |
static struct page *dequeue_huge_page_node(struct hstate *h, int nid)
{
struct page *page;
list_for_each_entry(page, &h->hugepage_freelists[nid], lru)
if (!is_migrate_isolate_page(page))
break;
/*
* if 'non-isolated free hugepage' not found on the list,
* the allocation fails.
*/
if (&h->hugepage_freelists[nid] == &page->lru)
return NULL;
list_move(&page->lru, &h->hugepage_activelist);
set_page_refcounted(page);
h->free_huge_pages--;
h->free_huge_pages_node[nid]--;
return page;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 85 | 93.41% | 3 | 75.00% |
| Aneesh Kumar K.V | 6 | 6.59% | 1 | 25.00% |
| Total | 91 | 100.00% | 4 | 100.00% |
/* Movability of hugepages depends on migration support. */
static inline gfp_t htlb_alloc_mask(struct hstate *h)
{
if (hugepages_treat_as_movable || hugepage_migration_supported(h))
return GFP_HIGHUSER_MOVABLE;
else
return GFP_HIGHUSER;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 28 | 100.00% | 2 | 100.00% |
| Total | 28 | 100.00% | 2 | 100.00% |
static struct page *dequeue_huge_page_vma(struct hstate *h,
struct vm_area_struct *vma,
unsigned long address, int avoid_reserve,
long chg)
{
struct page *page = NULL;
struct mempolicy *mpol;
nodemask_t *nodemask;
struct zonelist *zonelist;
struct zone *zone;
struct zoneref *z;
unsigned int cpuset_mems_cookie;
/*
* A child process with MAP_PRIVATE mappings created by their parent
* have no page reserves. This check ensures that reservations are
* not "stolen". The child may still get SIGKILLed
*/
if (!vma_has_reserves(vma, chg) &&
h->free_huge_pages - h->resv_huge_pages == 0)
goto err;
/* If reserves cannot be used, ensure enough pages are in the pool */
if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0)
goto err;
retry_cpuset:
cpuset_mems_cookie = read_mems_allowed_begin();
zonelist = huge_zonelist(vma, address,
htlb_alloc_mask(h), &mpol, &nodemask);
for_each_zone_zonelist_nodemask(zone, z, zonelist,
MAX_NR_ZONES - 1, nodemask) {
if (cpuset_zone_allowed(zone, htlb_alloc_mask(h))) {
page = dequeue_huge_page_node(h, zone_to_nid(zone));
if (page) {
if (avoid_reserve)
break;
if (!vma_has_reserves(vma, chg))
break;
SetPagePrivate(page);
h->resv_huge_pages--;
break;
}
}
}
mpol_cond_put(mpol);
if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie)))
goto retry_cpuset;
return page;
err:
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 78 | 33.19% | 1 | 5.56% |
| JoonSoo Kim | 47 | 20.00% | 4 | 22.22% |
| Mel Gorman | 27 | 11.49% | 3 | 16.67% |
| Nishanth Aravamudan | 22 | 9.36% | 1 | 5.56% |
| Miao Xie | 17 | 7.23% | 1 | 5.56% |
| Naoya Horiguchi | 16 | 6.81% | 2 | 11.11% |
| Andi Kleen | 14 | 5.96% | 1 | 5.56% |
| Adam Litke | 8 | 3.40% | 1 | 5.56% |
| Andrew Morton | 2 | 0.85% | 1 | 5.56% |
| Konstantin Khlebnikov | 2 | 0.85% | 1 | 5.56% |
| Nicholas Piggin | 1 | 0.43% | 1 | 5.56% |
| Vladimir Davydov | 1 | 0.43% | 1 | 5.56% |
| Total | 235 | 100.00% | 18 | 100.00% |
/*
* common helper functions for hstate_next_node_to_{alloc|free}.
* We may have allocated or freed a huge page based on a different
* nodes_allowed previously, so h->next_node_to_{alloc|free} might
* be outside of *nodes_allowed. Ensure that we use an allowed
* node for alloc or free.
*/
static int next_node_allowed(int nid, nodemask_t *nodes_allowed)
{
nid = next_node_in(nid, *nodes_allowed);
VM_BUG_ON(nid >= MAX_NUMNODES);
return nid;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 32 | 96.97% | 1 | 50.00% |
| Andrew Morton | 1 | 3.03% | 1 | 50.00% |
| Total | 33 | 100.00% | 2 | 100.00% |
static int get_valid_node_allowed(int nid, nodemask_t *nodes_allowed)
{
if (!node_isset(nid, *nodes_allowed))
nid = next_node_allowed(nid, nodes_allowed);
return nid;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 36 | 100.00% | 1 | 100.00% |
| Total | 36 | 100.00% | 1 | 100.00% |
/*
* returns the previously saved node ["this node"] from which to
* allocate a persistent huge page for the pool and advance the
* next node from which to allocate, handling wrap at end of node
* mask.
*/
static int hstate_next_node_to_alloc(struct hstate *h,
nodemask_t *nodes_allowed)
{
int nid;
VM_BUG_ON(!nodes_allowed);
nid = get_valid_node_allowed(h->next_nid_to_alloc, nodes_allowed);
h->next_nid_to_alloc = next_node_allowed(nid, nodes_allowed);
return nid;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 49 | 100.00% | 1 | 100.00% |
| Total | 49 | 100.00% | 1 | 100.00% |
/*
* helper for free_pool_huge_page() - return the previously saved
* node ["this node"] from which to free a huge page. Advance the
* next node id whether or not we find a free huge page to free so
* that the next attempt to free addresses the next node.
*/
static int hstate_next_node_to_free(struct hstate *h, nodemask_t *nodes_allowed)
{
int nid;
VM_BUG_ON(!nodes_allowed);
nid = get_valid_node_allowed(h->next_nid_to_free, nodes_allowed);
h->next_nid_to_free = next_node_allowed(nid, nodes_allowed);
return nid;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 49 | 100.00% | 1 | 100.00% |
| Total | 49 | 100.00% | 1 | 100.00% |
#define for_each_node_mask_to_alloc(hs, nr_nodes, node, mask) \
for (nr_nodes = nodes_weight(*mask); \
nr_nodes > 0 && \
((node = hstate_next_node_to_alloc(hs, mask)) || 1); \
nr_nodes--)
#define for_each_node_mask_to_free(hs, nr_nodes, node, mask) \
for (nr_nodes = nodes_weight(*mask); \
nr_nodes > 0 && \
((node = hstate_next_node_to_free(hs, mask)) || 1); \
nr_nodes--)
#if defined(CONFIG_ARCH_HAS_GIGANTIC_PAGE) && \
((defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || \
defined(CONFIG_CMA))
static void destroy_compound_gigantic_page(struct page *page,
unsigned int order)
{
int i;
int nr_pages = 1 << order;
struct page *p = page + 1;
atomic_set(compound_mapcount_ptr(page), 0);
for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
clear_compound_head(p);
set_page_refcounted(p);
}
set_compound_order(page, 0);
__ClearPageHead(page);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 80 | 86.96% | 1 | 25.00% |
| Gerald Schaefer | 10 | 10.87% | 1 | 25.00% |
| Kirill A. Shutemov | 2 | 2.17% | 2 | 50.00% |
| Total | 92 | 100.00% | 4 | 100.00% |
static void free_gigantic_page(struct page *page, unsigned int order)
{
free_contig_range(page_to_pfn(page), 1 << order);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 26 | 96.30% | 1 | 50.00% |
| Kirill A. Shutemov | 1 | 3.70% | 1 | 50.00% |
| Total | 27 | 100.00% | 2 | 100.00% |
static int __alloc_gigantic_page(unsigned long start_pfn,
unsigned long nr_pages)
{
unsigned long end_pfn = start_pfn + nr_pages;
return alloc_contig_range(start_pfn, end_pfn, MIGRATE_MOVABLE,
GFP_KERNEL);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 32 | 94.12% | 1 | 50.00% |
| Lucas Stach | 2 | 5.88% | 1 | 50.00% |
| Total | 34 | 100.00% | 2 | 100.00% |
static bool pfn_range_valid_gigantic(struct zone *z,
unsigned long start_pfn, unsigned long nr_pages)
{
unsigned long i, end_pfn = start_pfn + nr_pages;
struct page *page;
for (i = start_pfn; i < end_pfn; i++) {
if (!pfn_valid(i))
return false;
page = pfn_to_page(i);
if (page_zone(page) != z)
return false;
if (PageReserved(page))
return false;
if (page_count(page) > 0)
return false;
if (PageHuge(page))
return false;
}
return true;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 97 | 85.09% | 1 | 50.00% |
| JoonSoo Kim | 17 | 14.91% | 1 | 50.00% |
| Total | 114 | 100.00% | 2 | 100.00% |
static bool zone_spans_last_pfn(const struct zone *zone,
unsigned long start_pfn, unsigned long nr_pages)
{
unsigned long last_pfn = start_pfn + nr_pages - 1;
return zone_spans_pfn(zone, last_pfn);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 38 | 100.00% | 1 | 100.00% |
| Total | 38 | 100.00% | 1 | 100.00% |
static struct page *alloc_gigantic_page(int nid, unsigned int order)
{
unsigned long nr_pages = 1 << order;
unsigned long ret, pfn, flags;
struct zone *z;
z = NODE_DATA(nid)->node_zones;
for (; z - NODE_DATA(nid)->node_zones < MAX_NR_ZONES; z++) {
spin_lock_irqsave(&z->lock, flags);
pfn = ALIGN(z->zone_start_pfn, nr_pages);
while (zone_spans_last_pfn(z, pfn, nr_pages)) {
if (pfn_range_valid_gigantic(z, pfn, nr_pages)) {
/*
* We release the zone lock here because
* alloc_contig_range() will also lock the zone
* at some point. If there's an allocation
* spinning on this lock, it may win the race
* and cause alloc_contig_range() to fail...
*/
spin_unlock_irqrestore(&z->lock, flags);
ret = __alloc_gigantic_page(pfn, nr_pages);
if (!ret)
return pfn_to_page(pfn);
spin_lock_irqsave(&z->lock, flags);
}
pfn += nr_pages;
}
spin_unlock_irqrestore(&z->lock, flags);
}
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 166 | 98.22% | 1 | 33.33% |
| JoonSoo Kim | 2 | 1.18% | 1 | 33.33% |
| Kirill A. Shutemov | 1 | 0.59% | 1 | 33.33% |
| Total | 169 | 100.00% | 3 | 100.00% |
static void prep_new_huge_page(struct hstate *h, struct page *page, int nid);
static void prep_compound_gigantic_page(struct page *page, unsigned int order);
static struct page *alloc_fresh_gigantic_page_node(struct hstate *h, int nid)
{
struct page *page;
page = alloc_gigantic_page(nid, huge_page_order(h));
if (page) {
prep_compound_gigantic_page(page, huge_page_order(h));
prep_new_huge_page(h, page, nid);
}
return page;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 61 | 100.00% | 1 | 100.00% |
| Total | 61 | 100.00% | 1 | 100.00% |
static int alloc_fresh_gigantic_page(struct hstate *h,
nodemask_t *nodes_allowed)
{
struct page *page = NULL;
int nr_nodes, node;
for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) {
page = alloc_fresh_gigantic_page_node(h, node);
if (page)
return 1;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 58 | 100.00% | 1 | 100.00% |
| Total | 58 | 100.00% | 1 | 100.00% |
static inline bool gigantic_page_supported(void) { return true; }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 12 | 100.00% | 1 | 100.00% |
| Total | 12 | 100.00% | 1 | 100.00% |
#else
static inline bool gigantic_page_supported(void) { return false; }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 12 | 100.00% | 1 | 100.00% |
| Total | 12 | 100.00% | 1 | 100.00% |
static inline void free_gigantic_page(struct page *page, unsigned int order) { }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 14 | 93.33% | 1 | 50.00% |
| Kirill A. Shutemov | 1 | 6.67% | 1 | 50.00% |
| Total | 15 | 100.00% | 2 | 100.00% |
static inline void destroy_compound_gigantic_page(struct page *page,
unsigned int order) { }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 14 | 93.33% | 1 | 50.00% |
| Kirill A. Shutemov | 1 | 6.67% | 1 | 50.00% |
| Total | 15 | 100.00% | 2 | 100.00% |
static inline int alloc_fresh_gigantic_page(struct hstate *h,
nodemask_t *nodes_allowed) { return 0; }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Luiz Fernando N. Capitulino | 19 | 100.00% | 1 | 100.00% |
| Total | 19 | 100.00% | 1 | 100.00% |
#endif
static void update_and_free_page(struct hstate *h, struct page *page)
{
int i;
if (hstate_is_gigantic(h) && !gigantic_page_supported())
return;
h->nr_huge_pages--;
h->nr_huge_pages_node[page_to_nid(page)]--;
for (i = 0; i < pages_per_huge_page(h); i++) {
page[i].flags &= ~(1 << PG_locked | 1 << PG_error |
1 << PG_referenced | 1 << PG_dirty |
1 << PG_active | 1 << PG_private |
1 << PG_writeback);
}
VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page);
set_compound_page_dtor(page, NULL_COMPOUND_DTOR);
set_page_refcounted(page);
if (hstate_is_gigantic(h)) {
destroy_compound_gigantic_page(page, huge_page_order(h));
free_gigantic_page(page, huge_page_order(h));
} else {
__free_pages(page, huge_page_order(h));
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 76 | 45.51% | 2 | 20.00% |
| Luiz Fernando N. Capitulino | 43 | 25.75% | 2 | 20.00% |
| Andi Kleen | 17 | 10.18% | 1 | 10.00% |
| Adam Litke | 10 | 5.99% | 1 | 10.00% |
| Nishanth Aravamudan | 10 | 5.99% | 1 | 10.00% |
| Aneesh Kumar K.V | 7 | 4.19% | 1 | 10.00% |
| Sasha Levin | 3 | 1.80% | 1 | 10.00% |
| Kirill A. Shutemov | 1 | 0.60% | 1 | 10.00% |
| Total | 167 | 100.00% | 10 | 100.00% |
struct hstate *size_to_hstate(unsigned long size)
{
struct hstate *h;
for_each_hstate(h) {
if (huge_page_size(h) == size)
return h;
}
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 37 | 100.00% | 1 | 100.00% |
| Total | 37 | 100.00% | 1 | 100.00% |
/*
* Test to determine whether the hugepage is "active/in-use" (i.e. being linked
* to hstate->hugepage_activelist.)
*
* This function can be called for tail pages, but never returns true for them.
*/
bool page_huge_active(struct page *page)
{
VM_BUG_ON_PAGE(!PageHuge(page), page);
return PageHead(page) && PagePrivate(&page[1]);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 36 | 100.00% | 1 | 100.00% |
| Total | 36 | 100.00% | 1 | 100.00% |
/* never called for tail page */
static void set_page_huge_active(struct page *page)
{
VM_BUG_ON_PAGE(!PageHeadHuge(page), page);
SetPagePrivate(&page[1]);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
static void clear_page_huge_active(struct page *page)
{
VM_BUG_ON_PAGE(!PageHeadHuge(page), page);
ClearPagePrivate(&page[1]);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
void free_huge_page(struct page *page)
{
/*
* Can't pass hstate in here because it is called from the
* compound page destructor.
*/
struct hstate *h = page_hstate(page);
int nid = page_to_nid(page);
struct hugepage_subpool *spool =
(struct hugepage_subpool *)page_private(page);
bool restore_reserve;
set_page_private(page, 0);
page->mapping = NULL;
VM_BUG_ON_PAGE(page_count(page), page);
VM_BUG_ON_PAGE(page_mapcount(page), page);
restore_reserve = PagePrivate(page);
ClearPagePrivate(page);
/*
* A return code of zero implies that the subpool will be under its
* minimum size if the reservation is not restored after page is free.
* Therefore, force restore_reserve operation.
*/
if (hugepage_subpool_put_pages(spool, 1) == 0)
restore_reserve = true;
spin_lock(&hugetlb_lock);
clear_page_huge_active(page);
hugetlb_cgroup_uncharge_page(hstate_index(h),
pages_per_huge_page(h), page);
if (restore_reserve)
h->resv_huge_pages++;
if (h->surplus_huge_pages_node[nid]) {
/* remove the page from active list */
list_del(&page->lru);
update_and_free_page(h, page);
h->surplus_huge_pages--;
h->surplus_huge_pages_node[nid]--;
} else {
arch_clear_hugepage_flags(page);
enqueue_huge_page(h, page);
}
spin_unlock(&hugetlb_lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 45 | 22.06% | 1 | 5.56% |
| Adam Litke | 32 | 15.69% | 3 | 16.67% |
| JoonSoo Kim | 24 | 11.76% | 2 | 11.11% |
| Aneesh Kumar K.V | 24 | 11.76% | 2 | 11.11% |
| Mike Kravetz | 22 | 10.78% | 2 | 11.11% |
| Andi Kleen | 21 | 10.29% | 2 | 11.11% |
| Naoya Horiguchi | 12 | 5.88% | 2 | 11.11% |
| Nishanth Aravamudan | 8 | 3.92% | 1 | 5.56% |
| Mel Gorman | 6 | 2.94% | 1 | 5.56% |
| Will Deacon | 5 | 2.45% | 1 | 5.56% |
| David Gibson | 5 | 2.45% | 1 | 5.56% |
| Total | 204 | 100.00% | 18 | 100.00% |
static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
{
INIT_LIST_HEAD(&page->lru);
set_compound_page_dtor(page, HUGETLB_PAGE_DTOR);
spin_lock(&hugetlb_lock);
set_hugetlb_cgroup(page, NULL);
h->nr_huge_pages++;
h->nr_huge_pages_node[nid]++;
spin_unlock(&hugetlb_lock);
put_page(page); /* free it into the hugepage allocator */
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Fengguang Wu | 27 | 37.50% | 1 | 12.50% |
| Aneesh Kumar K.V | 15 | 20.83% | 2 | 25.00% |
| Adam Litke | 14 | 19.44% | 2 | 25.00% |
| Andi Kleen | 9 | 12.50% | 1 | 12.50% |
| Andy Whitcroft | 6 | 8.33% | 1 | 12.50% |
| Kirill A. Shutemov | 1 | 1.39% | 1 | 12.50% |
| Total | 72 | 100.00% | 8 | 100.00% |
static void prep_compound_gigantic_page(struct page *page, unsigned int order)
{
int i;
int nr_pages = 1 << order;
struct page *p = page + 1;
/* we rely on prep_new_huge_page to set the destructor */
set_compound_order(page, order);
__ClearPageReserved(page);
__SetPageHead(page);
for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
/*
* For gigantic hugepages allocated through bootmem at
* boot, it's safer to be consistent with the not-gigantic
* hugepages and clear the PG_reserved bit from all tail pages
* too. Otherwse drivers using get_user_pages() to access tail
* pages may get the reference counting wrong if they see
* PG_reserved set on a tail page (despite the head page not
* having PG_reserved set). Enforcing this consistency between
* head and tail pages allows drivers to optimize away a check
* on the head page when they need know if put_page() is needed
* after get_user_pages().
*/
__ClearPageReserved(p);
set_page_count(p, 0);
set_compound_head(p, page);
}
atomic_set(compound_mapcount_ptr(page), -1);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Fengguang Wu | 52 | 47.71% | 1 | 11.11% |
| Andi Kleen | 19 | 17.43% | 1 | 11.11% |
| Mike Kravetz | 11 | 10.09% | 1 | 11.11% |
| Andrea Arcangeli | 10 | 9.17% | 1 | 11.11% |
| Youquan Song | 7 | 6.42% | 1 | 11.11% |
| Kirill A. Shutemov | 6 | 5.50% | 3 | 33.33% |
| David Rientjes | 4 | 3.67% | 1 | 11.11% |
| Total | 109 | 100.00% | 9 | 100.00% |
/*
* PageHuge() only returns true for hugetlbfs pages, but not for normal or
* transparent huge pages. See the PageTransHuge() documentation for more
* details.
*/
int PageHuge(struct page *page)
{
if (!PageCompound(page))
return 0;
page = compound_head(page);
return page[1].compound_dtor == HUGETLB_PAGE_DTOR;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Fengguang Wu | 26 | 68.42% | 1 | 25.00% |
| Kirill A. Shutemov | 6 | 15.79% | 1 | 25.00% |
| Andi Kleen | 5 | 13.16% | 1 | 25.00% |
| Andrew Morton | 1 | 2.63% | 1 | 25.00% |
| Total | 38 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL_GPL(PageHuge);
/*
* PageHeadHuge() only returns true for hugetlbfs head page, but not for
* normal or transparent huge pages.
*/
int PageHeadHuge(struct page *page_head)
{
if (!PageHead(page_head))
return 0;
return get_compound_page_dtor(page_head) == free_huge_page;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrea Arcangeli | 28 | 96.55% | 1 | 50.00% |
| Andrew Morton | 1 | 3.45% | 1 | 50.00% |
| Total | 29 | 100.00% | 2 | 100.00% |
pgoff_t __basepage_index(struct page *page)
{
struct page *page_head = compound_head(page);
pgoff_t index = page_index(page_head);
unsigned long compound_idx;
if (!PageHuge(page_head))
return page_index(page);
if (compound_order(page_head) >= MAX_ORDER)
compound_idx = page_to_pfn(page) - page_to_pfn(page_head);
else
compound_idx = page - page_head;
return (index << compound_order(page_head)) + compound_idx;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Zhang Yi | 86 | 100.00% | 1 | 100.00% |
| Total | 86 | 100.00% | 1 | 100.00% |
static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
{
struct page *page;
page = __alloc_pages_node(nid,
htlb_alloc_mask(h)|__GFP_COMP|__GFP_THISNODE|
__GFP_REPEAT|__GFP_NOWARN,
huge_page_order(h));
if (page) {
prep_new_huge_page(h, page, nid);
}
return page;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 34 | 53.12% | 1 | 12.50% |
| Adam Litke | 14 | 21.88% | 3 | 37.50% |
| Andi Kleen | 12 | 18.75% | 2 | 25.00% |
| Naoya Horiguchi | 3 | 4.69% | 1 | 12.50% |
| Vlastimil Babka | 1 | 1.56% | 1 | 12.50% |
| Total | 64 | 100.00% | 8 | 100.00% |
static int alloc_fresh_huge_page(struct hstate *h, nodemask_t *nodes_allowed)
{
struct page *page;
int nr_nodes, node;
int ret = 0;
for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) {
page = alloc_fresh_huge_page_node(h, node);
if (page) {
ret = 1;
break;
}
}
if (ret)
count_vm_event(HTLB_BUDDY_PGALLOC);
else
count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 26 | 32.50% | 1 | 12.50% |
| Adam Litke | 24 | 30.00% | 1 | 12.50% |
| JoonSoo Kim | 11 | 13.75% | 1 | 12.50% |
| Lee Schermerhorn | 10 | 12.50% | 2 | 25.00% |
| Andi Kleen | 6 | 7.50% | 1 | 12.50% |
| Nishanth Aravamudan | 2 | 2.50% | 1 | 12.50% |
| Adrian Bunk | 1 | 1.25% | 1 | 12.50% |
| Total | 80 | 100.00% | 8 | 100.00% |
/*
* Free huge page from pool from next node to free.
* Attempt to keep persistent huge pages more or less
* balanced over allowed nodes.
* Called with hugetlb_lock locked.
*/
static int free_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed,
bool acct_surplus)
{
int nr_nodes, node;
int ret = 0;
for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) {
/*
* If we're returning unused surplus pages, only examine
* nodes with surplus pages.
*/
if ((!acct_surplus || h->surplus_huge_pages_node[node]) &&
!list_empty(&h->hugepage_freelists[node])) {
struct page *page =
list_entry(h->hugepage_freelists[node].next,
struct page, lru);
list_del(&page->lru);
h->free_huge_pages--;
h->free_huge_pages_node[node]--;
if (acct_surplus) {
h->surplus_huge_pages--;
h->surplus_huge_pages_node[node]--;
}
update_and_free_page(h, page);
ret = 1;
break;
}
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 131 | 89.73% | 4 | 80.00% |
| JoonSoo Kim | 15 | 10.27% | 1 | 20.00% |
| Total | 146 | 100.00% | 5 | 100.00% |
/*
* Dissolve a given free hugepage into free buddy pages. This function does
* nothing for in-use (including surplus) hugepages. Returns -EBUSY if the
* number of free hugepages would be reduced below the number of reserved
* hugepages.
*/
static int dissolve_free_huge_page(struct page *page)
{
int rc = 0;
spin_lock(&hugetlb_lock);
if (PageHuge(page) && !page_count(page)) {
struct page *head = compound_head(page);
struct hstate *h = page_hstate(head);
int nid = page_to_nid(head);
if (h->free_huge_pages - h->resv_huge_pages == 0) {
rc = -EBUSY;
goto out;
}
list_del(&head->lru);
h->free_huge_pages--;
h->free_huge_pages_node[nid]--;
h->max_huge_pages--;
update_and_free_page(h, head);
}
out:
spin_unlock(&hugetlb_lock);
return rc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 79 | 60.31% | 1 | 25.00% |
| Gerald Schaefer | 47 | 35.88% | 2 | 50.00% |
| zhong jiang | 5 | 3.82% | 1 | 25.00% |
| Total | 131 | 100.00% | 4 | 100.00% |
/*
* Dissolve free hugepages in a given pfn range. Used by memory hotplug to
* make specified memory blocks removable from the system.
* Note that this will dissolve a free gigantic hugepage completely, if any
* part of it lies within the given range.
* Also note that if dissolve_free_huge_page() returns with an error, all
* free hugepages that were dissolved before that error are lost.
*/
int dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn)
{
unsigned long pfn;
struct page *page;
int rc = 0;
if (!hugepages_supported())
return rc;
for (pfn = start_pfn; pfn < end_pfn; pfn += 1 << minimum_order) {
page = pfn_to_page(pfn);
if (PageHuge(page) && !page_count(page)) {
rc = dissolve_free_huge_page(page);
if (rc)
break;
}
}
return rc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Gerald Schaefer | 50 | 54.95% | 2 | 40.00% |
| Naoya Horiguchi | 35 | 38.46% | 2 | 40.00% |
| Li Zhong | 6 | 6.59% | 1 | 20.00% |
| Total | 91 | 100.00% | 5 | 100.00% |
/*
* There are 3 ways this can get called:
* 1. With vma+addr: we use the VMA's memory policy
* 2. With !vma, but nid=NUMA_NO_NODE: We try to allocate a huge
* page from any node, and let the buddy allocator itself figure
* it out.
* 3. With !vma, but nid!=NUMA_NO_NODE. We allocate a huge page
* strictly from 'nid'
*/
static struct page *__hugetlb_alloc_buddy_huge_page(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr, int nid)
{
int order = huge_page_order(h);
gfp_t gfp = htlb_alloc_mask(h)|__GFP_COMP|__GFP_REPEAT|__GFP_NOWARN;
unsigned int cpuset_mems_cookie;
/*
* We need a VMA to get a memory policy. If we do not
* have one, we use the 'nid' argument.
*
* The mempolicy stuff below has some non-inlined bits
* and calls ->vm_ops. That makes it hard to optimize at
* compile-time, even when NUMA is off and it does
* nothing. This helps the compiler optimize it out.
*/
if (!IS_ENABLED(CONFIG_NUMA) || !vma) {
/*
* If a specific node is requested, make sure to
* get memory from there, but only when a node
* is explicitly specified.
*/
if (nid != NUMA_NO_NODE)
gfp |= __GFP_THISNODE;
/*
* Make sure to call something that can handle
* nid=NUMA_NO_NODE
*/
return alloc_pages_node(nid, gfp, order);
}
/*
* OK, so we have a VMA. Fetch the mempolicy and try to
* allocate a huge page with it. We will only reach this
* when CONFIG_NUMA=y.
*/
do {
struct page *page;
struct mempolicy *mpol;
struct zonelist *zl;
nodemask_t *nodemask;
cpuset_mems_cookie = read_mems_allowed_begin();
zl = huge_zonelist(vma, addr, gfp, &mpol, &nodemask);
mpol_cond_put(mpol);
page = __alloc_pages_nodemask(gfp, order, zl, nodemask);
if (page)
return page;
} while (read_mems_allowed_retry(cpuset_mems_cookie));
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Hansen | 158 | 94.05% | 2 | 33.33% |
| Andrew Morton | 4 | 2.38% | 1 | 16.67% |
| Andi Kleen | 4 | 2.38% | 1 | 16.67% |
| Christoph Lameter | 1 | 0.60% | 1 | 16.67% |
| David Gibson | 1 | 0.60% | 1 | 16.67% |
| Total | 168 | 100.00% | 6 | 100.00% |
/*
* There are two ways to allocate a huge page:
* 1. When you have a VMA and an address (like a fault)
* 2. When you have no VMA (like when setting /proc/.../nr_hugepages)
*
* 'vma' and 'addr' are only for (1). 'nid' is always NUMA_NO_NODE in
* this case which signifies that the allocation should be done with
* respect for the VMA's memory policy.
*
* For (2), we ignore 'vma' and 'addr' and use 'nid' exclusively. This
* implies that memory policies will not be taken in to account.
*/
static struct page *__alloc_buddy_huge_page(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr, int nid)
{
struct page *page;
unsigned int r_nid;
if (hstate_is_gigantic(h))
return NULL;
/*
* Make sure that anyone specifying 'nid' is not also specifying a VMA.
* This makes sure the caller is picking _one_ of the modes with which
* we can call this function, not both.
*/
if (vma || (addr != -1)) {
VM_WARN_ON_ONCE(addr == -1);
VM_WARN_ON_ONCE(nid != NUMA_NO_NODE);
}
/*
* Assume we will successfully allocate the surplus page to
* prevent racing processes from causing the surplus to exceed
* overcommit
*
* This however introduces a different race, where a process B
* tries to grow the static hugepage pool while alloc_pages() is
* called by process A. B will only examine the per-node
* counters in determining if surplus huge pages can be
* converted to normal huge pages in adjust_pool_surplus(). A
* won't be able to increment the per-node counter, until the
* lock is dropped by B, but B doesn't drop hugetlb_lock until
* no more huge pages can be converted from surplus to normal
* state (and doesn't try to convert again). Thus, we have a
* case where a surplus huge page exists, the pool is grown, and
* the surplus huge page still exists after, even though it
* should just have been converted to a normal huge page. This
* does not leak memory, though, as the hugepage will be freed
* once it is out of use. It also does not allow the counters to
* go out of whack in adjust_pool_surplus() as we don't modify
* the node values until we've gotten the hugepage and only the
* per-node value is checked there.
*/
spin_lock(&hugetlb_lock);
if (h->surplus_huge_pages >= h->nr_overcommit_huge_pages) {
spin_unlock(&hugetlb_lock);
return NULL;
} else {
h->nr_huge_pages++;
h->surplus_huge_pages++;
}
spin_unlock(&hugetlb_lock);
page = __hugetlb_alloc_buddy_huge_page(h, vma, addr, nid);
spin_lock(&hugetlb_lock);
if (page) {
INIT_LIST_HEAD(&page->lru);
r_nid = page_to_nid(page);
set_compound_page_dtor(page, HUGETLB_PAGE_DTOR);
set_hugetlb_cgroup(page, NULL);
/*
* We incremented the global counters already
*/
h->nr_huge_pages_node[r_nid]++;
h->surplus_huge_pages_node[r_nid]++;
__count_vm_event(HTLB_BUDDY_PGALLOC);
} else {
h->nr_huge_pages--;
h->surplus_huge_pages--;
__count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
}
spin_unlock(&hugetlb_lock);
return page;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 57 | 25.56% | 1 | 4.76% |
| Dave Hansen | 53 | 23.77% | 2 | 9.52% |
| Adam Litke | 27 | 12.11% | 5 | 23.81% |
| Andi Kleen | 23 | 10.31% | 2 | 9.52% |
| Aneesh Kumar K.V | 15 | 6.73% | 2 | 9.52% |
| Naoya Horiguchi | 12 | 5.38% | 2 | 9.52% |
| David Gibson | 9 | 4.04% | 1 | 4.76% |
| Andrew Morton | 9 | 4.04% | 1 | 4.76% |
| Mel Gorman | 8 | 3.59% | 2 | 9.52% |
| Ken Chen | 6 | 2.69% | 1 | 4.76% |
| Luiz Fernando N. Capitulino | 3 | 1.35% | 1 | 4.76% |
| Kirill A. Shutemov | 1 | 0.45% | 1 | 4.76% |
| Total | 223 | 100.00% | 21 | 100.00% |
/*
* Allocate a huge page from 'nid'. Note, 'nid' may be
* NUMA_NO_NODE, which means that it may be allocated
* anywhere.
*/
static
struct page *__alloc_buddy_huge_page_no_mpol(struct hstate *h, int nid)
{
unsigned long addr = -1;
return __alloc_buddy_huge_page(h, NULL, addr, nid);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Hansen | 35 | 100.00% | 2 | 100.00% |
| Total | 35 | 100.00% | 2 | 100.00% |
/*
* Use the VMA's mpolicy to allocate a huge page from the buddy.
*/
static
struct page *__alloc_buddy_huge_page_with_mpol(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr)
{
return __alloc_buddy_huge_page(h, vma, addr, NUMA_NO_NODE);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Hansen | 34 | 100.00% | 2 | 100.00% |
| Total | 34 | 100.00% | 2 | 100.00% |
/*
* This allocation function is useful in the context where vma is irrelevant.
* E.g. soft-offlining uses this function because it only cares physical
* address of error page.
*/
struct page *alloc_huge_page_node(struct hstate *h, int nid)
{
struct page *page = NULL;
spin_lock(&hugetlb_lock);
if (h->free_huge_pages - h->resv_huge_pages > 0)
page = dequeue_huge_page_node(h, nid);
spin_unlock(&hugetlb_lock);
if (!page)
page = __alloc_buddy_huge_page_no_mpol(h, nid);
return page;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 57 | 79.17% | 1 | 33.33% |
| JoonSoo Kim | 14 | 19.44% | 1 | 33.33% |
| Dave Hansen | 1 | 1.39% | 1 | 33.33% |
| Total | 72 | 100.00% | 3 | 100.00% |
/*
* Increase the hugetlb pool such that it can accommodate a reservation
* of size 'delta'.
*/
static int gather_surplus_pages(struct hstate *h, int delta)
{
struct list_head surplus_list;
struct page *page, *tmp;
int ret, i;
int needed, allocated;
bool alloc_ok = true;
needed = (h->resv_huge_pages + delta) - h->free_huge_pages;
if (needed <= 0) {
h->resv_huge_pages += delta;
return 0;
}
allocated = 0;
INIT_LIST_HEAD(&surplus_list);
ret = -ENOMEM;
retry:
spin_unlock(&hugetlb_lock);
for (i = 0; i < needed; i++) {
page = __alloc_buddy_huge_page_no_mpol(h, NUMA_NO_NODE);
if (!page) {
alloc_ok = false;
break;
}
list_add(&page->lru, &surplus_list);
}
allocated += i;
/*
* After retaking hugetlb_lock, we need to recalculate 'needed'
* because either resv_huge_pages or free_huge_pages may have changed.
*/
spin_lock(&hugetlb_lock);
needed = (h->resv_huge_pages + delta) -
(h->free_huge_pages + allocated);
if (needed > 0) {
if (alloc_ok)
goto retry;
/*
* We were not able to allocate enough pages to
* satisfy the entire reservation so we free what
* we've allocated so far.
*/
goto free;
}
/*
* The surplus_list now contains _at_least_ the number of extra pages
* needed to accommodate the reservation. Add the appropriate number
* of pages to the hugetlb pool and free the extras back to the buddy
* allocator. Commit the entire reservation here to prevent another
* process from stealing the pages as they are added to the pool but
* before they are reserved.
*/
needed += allocated;
h->resv_huge_pages += delta;
ret = 0;
/* Free the needed pages to the hugetlb pool */
list_for_each_entry_safe(page, tmp, &surplus_list, lru) {
if ((--needed) < 0)
break;
/*
* This page is now managed by the hugetlb allocator and has
* no users -- drop the buddy allocator's reference.
*/
put_page_testzero(page);
VM_BUG_ON_PAGE(page_count(page), page);
enqueue_huge_page(h, page);
}
free:
spin_unlock(&hugetlb_lock);
/* Free unnecessary surplus pages to the buddy allocator */
list_for_each_entry_safe(page, tmp, &surplus_list, lru)
put_page(page);
spin_lock(&hugetlb_lock);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 159 | 55.99% | 1 | 7.14% |
| Hillf Danton | 31 | 10.92% | 2 | 14.29% |
| Kenneth W. Chen | 28 | 9.86% | 1 | 7.14% |
| Andi Kleen | 21 | 7.39% | 1 | 7.14% |
| Naoya Horiguchi | 15 | 5.28% | 2 | 14.29% |
| David Gibson | 13 | 4.58% | 1 | 7.14% |
| Ken Chen | 5 | 1.76% | 1 | 7.14% |
| Nishanth Aravamudan | 4 | 1.41% | 1 | 7.14% |
| Andrew Morton | 3 | 1.06% | 1 | 7.14% |
| Sasha Levin | 3 | 1.06% | 1 | 7.14% |
| Dave Hansen | 1 | 0.35% | 1 | 7.14% |
| Lucas De Marchi | 1 | 0.35% | 1 | 7.14% |
| Total | 284 | 100.00% | 14 | 100.00% |
/*
* This routine has two main purposes:
* 1) Decrement the reservation count (resv_huge_pages) by the value passed
* in unused_resv_pages. This corresponds to the prior adjustments made
* to the associated reservation map.
* 2) Free any unused surplus pages that may have been allocated to satisfy
* the reservation. As many as unused_resv_pages may be freed.
*
* Called with hugetlb_lock held. However, the lock could be dropped (and
* reacquired) during calls to cond_resched_lock. Whenever dropping the lock,
* we must make sure nobody else can claim pages we are in the process of
* freeing. Do this by ensuring resv_huge_page always is greater than the
* number of huge pages we plan to free when dropping the lock.
*/
static void return_unused_surplus_pages(struct hstate *h,
unsigned long unused_resv_pages)
{
unsigned long nr_pages;
/* Cannot return gigantic pages currently */
if (hstate_is_gigantic(h))
goto out;
/*
* Part (or even all) of the reservation could have been backed
* by pre-allocated pages. Only free surplus pages.
*/
nr_pages = min(unused_resv_pages, h->surplus_huge_pages);
/*
* We want to release as many surplus pages as possible, spread
* evenly across all nodes with memory. Iterate across these nodes
* until we can no longer free unreserved surplus pages. This occurs
* when the nodes with surplus pages have no free pages.
* free_pool_huge_page() will balance the the freed pages across the
* on-line nodes with memory and will handle the hstate accounting.
*
* Note that we decrement resv_huge_pages as we free the pages. If
* we drop the lock, resv_huge_pages will still be sufficiently large
* to cover subsequent pages we may free.
*/
while (nr_pages--) {
h->resv_huge_pages--;
unused_resv_pages--;
if (!free_pool_huge_page(h, &node_states[N_MEMORY], 1))
goto out;
cond_resched_lock(&hugetlb_lock);
}
out:
/* Fully uncommit the reservation */
h->resv_huge_pages -= unused_resv_pages;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 25 | 27.17% | 1 | 8.33% |
| Andy Whitcroft | 19 | 20.65% | 1 | 8.33% |
| Andrew Morton | 15 | 16.30% | 2 | 16.67% |
| Andi Kleen | 14 | 15.22% | 2 | 16.67% |
| Lee Schermerhorn | 9 | 9.78% | 3 | 25.00% |
| Masayoshi Mizuma | 6 | 6.52% | 1 | 8.33% |
| Luiz Fernando N. Capitulino | 3 | 3.26% | 1 | 8.33% |
| Lai Jiangshan | 1 | 1.09% | 1 | 8.33% |
| Total | 92 | 100.00% | 12 | 100.00% |
/*
* vma_needs_reservation, vma_commit_reservation and vma_end_reservation
* are used by the huge page allocation routines to manage reservations.
*
* vma_needs_reservation is called to determine if the huge page at addr
* within the vma has an associated reservation. If a reservation is
* needed, the value 1 is returned. The caller is then responsible for
* managing the global reservation and subpool usage counts. After
* the huge page has been allocated, vma_commit_reservation is called
* to add the page to the reservation map. If the page allocation fails,
* the reservation must be ended instead of committed. vma_end_reservation
* is called in such cases.
*
* In the normal case, vma_commit_reservation returns the same value
* as the preceding vma_needs_reservation call. The only time this
* is not the case is if a reserve map was changed between calls. It
* is the responsibility of the caller to notice the difference and
* take appropriate action.
*
* vma_add_reservation is used in error paths where a reservation must
* be restored when a newly allocated huge page must be freed. It is
* to be called after calling vma_needs_reservation to determine if a
* reservation exists.
*/
enum vma_resv_mode {
VMA_NEEDS_RESV,
VMA_COMMIT_RESV,
VMA_END_RESV,
VMA_ADD_RESV,
};
static long __vma_reservation_common(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr,
enum vma_resv_mode mode)
{
struct resv_map *resv;
pgoff_t idx;
long ret;
resv = vma_resv_map(vma);
if (!resv)
return 1;
idx = vma_hugecache_offset(h, vma, addr);
switch (mode) {
case VMA_NEEDS_RESV:
ret = region_chg(resv, idx, idx + 1);
break;
case VMA_COMMIT_RESV:
ret = region_add(resv, idx, idx + 1);
break;
case VMA_END_RESV:
region_abort(resv, idx, idx + 1);
ret = 0;
break;
case VMA_ADD_RESV:
if (vma->vm_flags & VM_MAYSHARE)
ret = region_add(resv, idx, idx + 1);
else {
region_abort(resv, idx, idx + 1);
ret = region_del(resv, idx, idx + 1);
}
break;
default:
BUG();
}
if (vma->vm_flags & VM_MAYSHARE)
return ret;
else if (is_vma_resv_set(vma, HPAGE_RESV_OWNER) && ret >= 0) {
/*
* In most cases, reserves always exist for private mappings.
* However, a file associated with mapping could have been
* hole punched or truncated after reserves were consumed.
* As subsequent fault on such a range will not use reserves.
* Subtle - The reserve map for private mappings has the
* opposite meaning than that of shared mappings. If NO
* entry is in the reserve map, it means a reservation exists.
* If an entry exists in the reserve map, it means the
* reservation has already been consumed. As a result, the
* return value of this routine is the opposite of the
* value returned from reserve map manipulation routines above.
*/
if (ret)
return 0;
else
return 1;
}
else
return ret < 0 ? ret : 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 141 | 62.67% | 5 | 38.46% |
| Andy Whitcroft | 51 | 22.67% | 2 | 15.38% |
| JoonSoo Kim | 24 | 10.67% | 3 | 23.08% |
| Andi Kleen | 7 | 3.11% | 1 | 7.69% |
| Johannes Weiner | 1 | 0.44% | 1 | 7.69% |
| Roel Kluin | 1 | 0.44% | 1 | 7.69% |
| Total | 225 | 100.00% | 13 | 100.00% |
static long vma_needs_reservation(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr)
{
return __vma_reservation_common(h, vma, addr, VMA_NEEDS_RESV);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 17 | 53.12% | 2 | 40.00% |
| Mike Kravetz | 8 | 25.00% | 2 | 40.00% |
| Andi Kleen | 7 | 21.88% | 1 | 20.00% |
| Total | 32 | 100.00% | 5 | 100.00% |
static long vma_commit_reservation(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr)
{
return __vma_reservation_common(h, vma, addr, VMA_COMMIT_RESV);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 27 | 84.38% | 2 | 66.67% |
| Andy Whitcroft | 5 | 15.62% | 1 | 33.33% |
| Total | 32 | 100.00% | 3 | 100.00% |
static void vma_end_reservation(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr)
{
(void)__vma_reservation_common(h, vma, addr, VMA_END_RESV);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 34 | 100.00% | 2 | 100.00% |
| Total | 34 | 100.00% | 2 | 100.00% |
static long vma_add_reservation(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr)
{
return __vma_reservation_common(h, vma, addr, VMA_ADD_RESV);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 32 | 100.00% | 1 | 100.00% |
| Total | 32 | 100.00% | 1 | 100.00% |
/*
* This routine is called to restore a reservation on error paths. In the
* specific error paths, a huge page was allocated (via alloc_huge_page)
* and is about to be freed. If a reservation for the page existed,
* alloc_huge_page would have consumed the reservation and set PagePrivate
* in the newly allocated page. When the page is freed via free_huge_page,
* the global reservation count will be incremented if PagePrivate is set.
* However, free_huge_page can not adjust the reserve map. Adjust the
* reserve map here to be consistent with global reserve count adjustments
* to be made by free_huge_page.
*/
static void restore_reserve_on_error(struct hstate *h,
struct vm_area_struct *vma, unsigned long address,
struct page *page)
{
if (unlikely(PagePrivate(page))) {
long rc = vma_needs_reservation(h, vma, address);
if (unlikely(rc < 0)) {
/*
* Rare out of memory condition in reserve map
* manipulation. Clear PagePrivate so that
* global reserve count will not be incremented
* by free_huge_page. This will make it appear
* as though the reservation for this page was
* consumed. This may prevent the task from
* faulting in the page at a later time. This
* is better than inconsistent global huge page
* accounting of reserve counts.
*/
ClearPagePrivate(page);
} else if (rc) {
rc = vma_add_reservation(h, vma, address);
if (unlikely(rc < 0))
/*
* See above comment about rare out of
* memory condition.
*/
ClearPagePrivate(page);
} else
vma_end_reservation(h, vma, address);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 109 | 100.00% | 1 | 100.00% |
| Total | 109 | 100.00% | 1 | 100.00% |
struct page *alloc_huge_page(struct vm_area_struct *vma,
unsigned long addr, int avoid_reserve)
{
struct hugepage_subpool *spool = subpool_vma(vma);
struct hstate *h = hstate_vma(vma);
struct page *page;
long map_chg, map_commit;
long gbl_chg;
int ret, idx;
struct hugetlb_cgroup *h_cg;
idx = hstate_index(h);
/*
* Examine the region/reserve map to determine if the process
* has a reservation for the page to be allocated. A return
* code of zero indicates a reservation exists (no change).
*/
map_chg = gbl_chg = vma_needs_reservation(h, vma, addr);
if (map_chg < 0)
return ERR_PTR(-ENOMEM);
/*
* Processes that did not create the mapping will have no
* reserves as indicated by the region/reserve map. Check
* that the allocation will not exceed the subpool limit.
* Allocations for MAP_NORESERVE mappings also need to be
* checked against any subpool limit.
*/
if (map_chg || avoid_reserve) {
gbl_chg = hugepage_subpool_get_pages(spool, 1);
if (gbl_chg < 0) {
vma_end_reservation(h, vma, addr);
return ERR_PTR(-ENOSPC);
}
/*
* Even though there was no reservation in the region/reserve
* map, there could be reservations associated with the
* subpool that can be used. This would be indicated if the
* return value of hugepage_subpool_get_pages() is zero.
* However, if avoid_reserve is specified we still avoid even
* the subpool reservations.
*/
if (avoid_reserve)
gbl_chg = 1;
}
ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg);
if (ret)
goto out_subpool_put;
spin_lock(&hugetlb_lock);
/*
* glb_chg is passed to indicate whether or not a page must be taken
* from the global free pool (global change). gbl_chg == 0 indicates
* a reservation exists for the allocation.
*/
page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve, gbl_chg);
if (!page) {
spin_unlock(&hugetlb_lock);
page = __alloc_buddy_huge_page_with_mpol(h, vma, addr);
if (!page)
goto out_uncharge_cgroup;
if (!avoid_reserve && vma_has_reserves(vma, gbl_chg)) {
SetPagePrivate(page);
h->resv_huge_pages--;
}
spin_lock(&hugetlb_lock);
list_move(&page->lru, &h->hugepage_activelist);
/* Fall through */
}
hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page);
spin_unlock(&hugetlb_lock);
set_page_private(page, (unsigned long)spool);
map_commit = vma_commit_reservation(h, vma, addr);
if (unlikely(map_chg > map_commit)) {
/*
* The page was added to the reservation map between
* vma_needs_reservation and vma_commit_reservation.
* This indicates a race with hugetlb_reserve_pages.
* Adjust for the subpool count incremented above AND
* in hugetlb_reserve_pages for the same page. Also,
* the reservation count added in hugetlb_reserve_pages
* no longer applies.
*/
long rsv_adjust;
rsv_adjust = hugepage_subpool_put_pages(spool, 1);
hugetlb_acct_memory(h, -rsv_adjust);
}
return page;
out_uncharge_cgroup:
hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg);
out_subpool_put:
if (map_chg || avoid_reserve)
hugepage_subpool_put_pages(spool, 1);
vma_end_reservation(h, vma, addr);
return ERR_PTR(-ENOSPC);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 89 | 22.88% | 5 | 18.52% |
| Aneesh Kumar K.V | 75 | 19.28% | 4 | 14.81% |
| Andy Whitcroft | 74 | 19.02% | 2 | 7.41% |
| Jianyu Zhan | 41 | 10.54% | 1 | 3.70% |
| Naoya Horiguchi | 25 | 6.43% | 2 | 7.41% |
| JoonSoo Kim | 20 | 5.14% | 3 | 11.11% |
| Andrew Morton | 19 | 4.88% | 2 | 7.41% |
| Andi Kleen | 15 | 3.86% | 1 | 3.70% |
| David Gibson | 13 | 3.34% | 1 | 3.70% |
| Adam Litke | 11 | 2.83% | 2 | 7.41% |
| Dave Hansen | 4 | 1.03% | 1 | 3.70% |
| Hugh Dickins | 1 | 0.26% | 1 | 3.70% |
| Roel Kluin | 1 | 0.26% | 1 | 3.70% |
| Kenneth W. Chen | 1 | 0.26% | 1 | 3.70% |
| Total | 389 | 100.00% | 27 | 100.00% |
/*
* alloc_huge_page()'s wrapper which simply returns the page if allocation
* succeeds, otherwise NULL. This function is called from new_vma_page(),
* where no ERR_VALUE is expected to be returned.
*/
struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
unsigned long addr, int avoid_reserve)
{
struct page *page = alloc_huge_page(vma, addr, avoid_reserve);
if (IS_ERR(page))
page = NULL;
return page;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 46 | 97.87% | 1 | 50.00% |
| Andrew Morton | 1 | 2.13% | 1 | 50.00% |
| Total | 47 | 100.00% | 2 | 100.00% |
int __weak alloc_bootmem_huge_page(struct hstate *h)
{
struct huge_bootmem_page *m;
int nr_nodes, node;
for_each_node_mask_to_alloc(h, nr_nodes, node, &node_states[N_MEMORY]) {
void *addr;
addr = memblock_virt_alloc_try_nid_nopanic(
huge_page_size(h), huge_page_size(h),
0, BOOTMEM_ALLOC_ACCESSIBLE, node);
if (addr) {
/*
* Use the beginning of the huge page to store the
* huge_bootmem_page struct (until gather_bootmem
* puts them into the mem_map).
*/
m = addr;
goto found;
}
}
return 0;
found:
BUG_ON(!IS_ALIGNED(virt_to_phys(m), huge_page_size(h)));
/* Put them into a private list first because mem_map is not up yet */
list_add(&m->list, &huge_boot_pages);
m->hstate = h;
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 93 | 80.87% | 1 | 20.00% |
| JoonSoo Kim | 11 | 9.57% | 1 | 20.00% |
| Grygorii Strashko | 5 | 4.35% | 1 | 20.00% |
| Luiz Fernando N. Capitulino | 5 | 4.35% | 1 | 20.00% |
| Cyrill V. Gorcunov | 1 | 0.87% | 1 | 20.00% |
| Total | 115 | 100.00% | 5 | 100.00% |
static void __init prep_compound_huge_page(struct page *page,
unsigned int order)
{
if (unlikely(order > (MAX_ORDER - 1)))
prep_compound_gigantic_page(page, order);
else
prep_compound_page(page, order);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 42 | 95.45% | 1 | 33.33% |
| David Rientjes | 1 | 2.27% | 1 | 33.33% |
| Kirill A. Shutemov | 1 | 2.27% | 1 | 33.33% |
| Total | 44 | 100.00% | 3 | 100.00% |
/* Put bootmem huge pages into the standard lists after mem_map is up */
static void __init gather_bootmem_prealloc(void)
{
struct huge_bootmem_page *m;
list_for_each_entry(m, &huge_boot_pages, list) {
struct hstate *h = m->hstate;
struct page *page;
#ifdef CONFIG_HIGHMEM
page = pfn_to_page(m->phys >> PAGE_SHIFT);
memblock_free_late(__pa(m),
sizeof(struct huge_bootmem_page));
#else
page = virt_to_page(m);
#endif
WARN_ON(page_count(page) != 1);
prep_compound_huge_page(page, h->order);
WARN_ON(PageReserved(page));
prep_new_huge_page(h, page, page_to_nid(page));
/*
* If we had gigantic hugepages allocated at boot time, we need
* to restore the 'stolen' pages to totalram_pages in order to
* fix confusing memory reports from free(1) and another
* side-effects, like CommitLimit going negative.
*/
if (hstate_is_gigantic(h))
adjust_managed_page_count(page, 1 << h->order);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 63 | 46.67% | 1 | 12.50% |
| Becky Bruce | 40 | 29.63% | 1 | 12.50% |
| Rafael Aquini | 11 | 8.15% | 1 | 12.50% |
| Andrea Arcangeli | 8 | 5.93% | 1 | 12.50% |
| Jiang Liu | 5 | 3.70% | 1 | 12.50% |
| Grygorii Strashko | 4 | 2.96% | 1 | 12.50% |
| Luiz Fernando N. Capitulino | 3 | 2.22% | 1 | 12.50% |
| Andy Whitcroft | 1 | 0.74% | 1 | 12.50% |
| Total | 135 | 100.00% | 8 | 100.00% |
static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
{
unsigned long i;
for (i = 0; i < h->max_huge_pages; ++i) {
if (hstate_is_gigantic(h)) {
if (!alloc_bootmem_huge_page(h))
break;
} else if (!alloc_fresh_huge_page(h,
&node_states[N_MEMORY]))
break;
}
h->max_huge_pages = i;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 30 | 41.10% | 4 | 36.36% |
| Andy Whitcroft | 26 | 35.62% | 1 | 9.09% |
| Lee Schermerhorn | 5 | 6.85% | 2 | 18.18% |
| Mel Gorman | 5 | 6.85% | 1 | 9.09% |
| Luiz Fernando N. Capitulino | 3 | 4.11% | 1 | 9.09% |
| Andrew Morton | 3 | 4.11% | 1 | 9.09% |
| Lai Jiangshan | 1 | 1.37% | 1 | 9.09% |
| Total | 73 | 100.00% | 11 | 100.00% |
static void __init hugetlb_init_hstates(void)
{
struct hstate *h;
for_each_hstate(h) {
if (minimum_order > huge_page_order(h))
minimum_order = huge_page_order(h);
/* oversize hugepages were init'ed in early boot */
if (!hstate_is_gigantic(h))
hugetlb_hstate_alloc_pages(h);
}
VM_BUG_ON(minimum_order == UINT_MAX);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 30 | 52.63% | 2 | 50.00% |
| Naoya Horiguchi | 23 | 40.35% | 1 | 25.00% |
| Luiz Fernando N. Capitulino | 4 | 7.02% | 1 | 25.00% |
| Total | 57 | 100.00% | 4 | 100.00% |
static char * __init memfmt(char *buf, unsigned long n)
{
if (n >= (1UL << 30))
sprintf(buf, "%lu GB", n >> 30);
else if (n >= (1UL << 20))
sprintf(buf, "%lu MB", n >> 20);
else
sprintf(buf, "%lu KB", n >> 10);
return buf;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 74 | 100.00% | 1 | 100.00% |
| Total | 74 | 100.00% | 1 | 100.00% |
static void __init report_hugepages(void)
{
struct hstate *h;
for_each_hstate(h) {
char buf[32];
pr_info("HugeTLB registered %s page size, pre-allocated %ld pages\n",
memfmt(buf, huge_page_size(h)),
h->free_huge_pages);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 41 | 91.11% | 3 | 60.00% |
| Andy Whitcroft | 2 | 4.44% | 1 | 20.00% |
| Andrew Morton | 2 | 4.44% | 1 | 20.00% |
| Total | 45 | 100.00% | 5 | 100.00% |
#ifdef CONFIG_HIGHMEM
static void try_to_free_low(struct hstate *h, unsigned long count,
nodemask_t *nodes_allowed)
{
int i;
if (hstate_is_gigantic(h))
return;
for_each_node_mask(i, *nodes_allowed) {
struct page *page, *next;
struct list_head *freel = &h->hugepage_freelists[i];
list_for_each_entry_safe(page, next, freel, lru) {
if (count >= h->nr_huge_pages)
return;
if (PageHighMem(page))
continue;
list_del(&page->lru);
update_and_free_page(h, page);
h->free_huge_pages--;
h->free_huge_pages_node[page_to_nid(page)]--;
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 81 | 68.07% | 1 | 16.67% |
| Andi Kleen | 21 | 17.65% | 2 | 33.33% |
| Lee Schermerhorn | 10 | 8.40% | 1 | 16.67% |
| Andy Whitcroft | 4 | 3.36% | 1 | 16.67% |
| Luiz Fernando N. Capitulino | 3 | 2.52% | 1 | 16.67% |
| Total | 119 | 100.00% | 6 | 100.00% |
#else
static inline void try_to_free_low(struct hstate *h, unsigned long count,
nodemask_t *nodes_allowed)
{
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 11 | 57.89% | 1 | 33.33% |
| Lee Schermerhorn | 4 | 21.05% | 1 | 33.33% |
| Andi Kleen | 4 | 21.05% | 1 | 33.33% |
| Total | 19 | 100.00% | 3 | 100.00% |
#endif
/*
* Increment or decrement surplus_huge_pages. Keep node-specific counters
* balanced by operating on them in a round-robin fashion.
* Returns 1 if an adjustment was made.
*/
static int adjust_pool_surplus(struct hstate *h, nodemask_t *nodes_allowed,
int delta)
{
int nr_nodes, node;
VM_BUG_ON(delta != -1 && delta != 1);
if (delta < 0) {
for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) {
if (h->surplus_huge_pages_node[node])
goto found;
}
} else {
for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) {
if (h->surplus_huge_pages_node[node] <
h->nr_huge_pages_node[node])
goto found;
}
}
return 0;
found:
h->surplus_huge_pages += delta;
h->surplus_huge_pages_node[node] += delta;
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Fengguang Wu | 64 | 51.61% | 1 | 20.00% |
| JoonSoo Kim | 36 | 29.03% | 1 | 20.00% |
| Lee Schermerhorn | 24 | 19.35% | 3 | 60.00% |
| Total | 124 | 100.00% | 5 | 100.00% |
#define persistent_huge_pages(h) (h->nr_huge_pages - h->surplus_huge_pages)
static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
nodemask_t *nodes_allowed)
{
unsigned long min_count, ret;
if (hstate_is_gigantic(h) && !gigantic_page_supported())
return h->max_huge_pages;
/*
* Increase the pool size
* First take pages out of surplus state. Then make up the
* remaining difference by allocating fresh huge pages.
*
* We might race with __alloc_buddy_huge_page() here and be unable
* to convert a surplus huge page to a normal huge page. That is
* not critical, though, it just means the overall size of the
* pool might be one hugepage larger than it needs to be, but
* within all the constraints specified by the sysctls.
*/
spin_lock(&hugetlb_lock);
while (h->surplus_huge_pages && count > persistent_huge_pages(h)) {
if (!adjust_pool_surplus(h, nodes_allowed, -1))
break;
}
while (count > persistent_huge_pages(h)) {
/*
* If this allocation races such that we no longer need the
* page, free_huge_page will handle it by freeing the page
* and reducing the surplus.
*/
spin_unlock(&hugetlb_lock);
/* yield cpu to avoid soft lockup */
cond_resched();
if (hstate_is_gigantic(h))
ret = alloc_fresh_gigantic_page(h, nodes_allowed);
else
ret = alloc_fresh_huge_page(h, nodes_allowed);
spin_lock(&hugetlb_lock);
if (!ret)
goto out;
/* Bail for signals. Probably ctrl-c from user */
if (signal_pending(current))
goto out;
}
/*
* Decrease the pool size
* First return free pages to the buddy allocator (being careful
* to keep enough around to satisfy reservations). Then place
* pages into surplus state as needed so the pool will shrink
* to the desired size as pages become free.
*
* By placing pages into the surplus state independent of the
* overcommit value, we are allowing the surplus pool size to
* exceed overcommit. There are few sane options here. Since
* __alloc_buddy_huge_page() is checking the global counter,
* though, we'll note that we're not allowed to exceed surplus
* and won't grow the pool anywhere else. Not until one of the
* sysctls are changed, or the surplus pages go out of use.
*/
min_count = h->resv_huge_pages + h->nr_huge_pages - h->free_huge_pages;
min_count = max(count, min_count);
try_to_free_low(h, min_count, nodes_allowed);
while (min_count < persistent_huge_pages(h)) {
if (!free_pool_huge_page(h, nodes_allowed, 0))
break;
cond_resched_lock(&hugetlb_lock);
}
while (count < persistent_huge_pages(h)) {
if (!adjust_pool_surplus(h, nodes_allowed, 1))
break;
}
out:
ret = persistent_huge_pages(h);
spin_unlock(&hugetlb_lock);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 159 | 62.11% | 1 | 8.33% |
| Andi Kleen | 31 | 12.11% | 2 | 16.67% |
| Luiz Fernando N. Capitulino | 24 | 9.38% | 2 | 16.67% |
| Lee Schermerhorn | 19 | 7.42% | 3 | 25.00% |
| Mel Gorman | 11 | 4.30% | 1 | 8.33% |
| Masayoshi Mizuma | 6 | 2.34% | 1 | 8.33% |
| Jia He | 4 | 1.56% | 1 | 8.33% |
| Naoya Horiguchi | 2 | 0.78% | 1 | 8.33% |
| Total | 256 | 100.00% | 12 | 100.00% |
#define HSTATE_ATTR_RO(_name) \
static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
#define HSTATE_ATTR(_name) \
static struct kobj_attribute _name##_attr = \
__ATTR(_name, 0644, _name##_show, _name##_store)
static struct kobject *hugepages_kobj;
static struct kobject *hstate_kobjs[HUGE_MAX_HSTATE];
static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp);
static struct hstate *kobj_to_hstate(struct kobject *kobj, int *nidp)
{
int i;
for (i = 0; i < HUGE_MAX_HSTATE; i++)
if (hstate_kobjs[i] == kobj) {
if (nidp)
*nidp = NUMA_NO_NODE;
return &hstates[i];
}
return kobj_to_node_hstate(kobj, nidp);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 45 | 66.18% | 1 | 33.33% |
| Lee Schermerhorn | 21 | 30.88% | 1 | 33.33% |
| Andi Kleen | 2 | 2.94% | 1 | 33.33% |
| Total | 68 | 100.00% | 3 | 100.00% |
static ssize_t nr_hugepages_show_common(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct hstate *h;
unsigned long nr_huge_pages;
int nid;
h = kobj_to_hstate(kobj, &nid);
if (nid == NUMA_NO_NODE)
nr_huge_pages = h->nr_huge_pages;
else
nr_huge_pages = h->nr_huge_pages_node[nid];
return sprintf(buf, "%lu\n", nr_huge_pages);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 37 | 50.00% | 1 | 33.33% |
| Lee Schermerhorn | 37 | 50.00% | 2 | 66.67% |
| Total | 74 | 100.00% | 3 | 100.00% |
static ssize_t __nr_hugepages_store_common(bool obey_mempolicy,
struct hstate *h, int nid,
unsigned long count, size_t len)
{
int err;
NODEMASK_ALLOC(nodemask_t, nodes_allowed, GFP_KERNEL | __GFP_NORETRY);
if (hstate_is_gigantic(h) && !gigantic_page_supported()) {
err = -EINVAL;
goto out;
}
if (nid == NUMA_NO_NODE) {
/*
* global hstate attribute
*/
if (!(obey_mempolicy &&
init_nodemask_of_mempolicy(nodes_allowed))) {
NODEMASK_FREE(nodes_allowed);
nodes_allowed = &node_states[N_MEMORY];
}
} else if (nodes_allowed) {
/*
* per node hstate attribute: adjust count to global,
* but restrict alloc/free to the specified node.
*/
count += h->nr_huge_pages - h->nr_huge_pages_node[nid];
init_nodemask_of_node(nodes_allowed, nid);
} else
nodes_allowed = &node_states[N_MEMORY];
h->max_huge_pages = set_max_huge_pages(h, count, nodes_allowed);
if (nodes_allowed != &node_states[N_MEMORY])
NODEMASK_FREE(nodes_allowed);
return len;
out:
NODEMASK_FREE(nodes_allowed);
return err;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 102 | 58.96% | 4 | 33.33% |
| Eric B Munson | 24 | 13.87% | 1 | 8.33% |
| Nishanth Aravamudan | 21 | 12.14% | 1 | 8.33% |
| David Rientjes | 12 | 6.94% | 2 | 16.67% |
| Luiz Fernando N. Capitulino | 7 | 4.05% | 2 | 16.67% |
| Andi Kleen | 4 | 2.31% | 1 | 8.33% |
| Lai Jiangshan | 3 | 1.73% | 1 | 8.33% |
| Total | 173 | 100.00% | 12 | 100.00% |
static ssize_t nr_hugepages_store_common(bool obey_mempolicy,
struct kobject *kobj, const char *buf,
size_t len)
{
struct hstate *h;
unsigned long count;
int nid;
int err;
err = kstrtoul(buf, 10, &count);
if (err)
return err;
h = kobj_to_hstate(kobj, &nid);
return __nr_hugepages_store_common(obey_mempolicy, h, nid, count, len);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Rientjes | 80 | 100.00% | 1 | 100.00% |
| Total | 80 | 100.00% | 1 | 100.00% |
static ssize_t nr_hugepages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return nr_hugepages_show_common(kobj, attr, buf);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
static ssize_t nr_hugepages_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t len)
{
return nr_hugepages_store_common(false, kobj, buf, len);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 34 | 94.44% | 1 | 50.00% |
| Nishanth Aravamudan | 2 | 5.56% | 1 | 50.00% |
| Total | 36 | 100.00% | 2 | 100.00% |
HSTATE_ATTR(nr_hugepages);
#ifdef CONFIG_NUMA
/*
* hstate attribute for optionally mempolicy-based constraint on persistent
* huge page alloc/free.
*/
static ssize_t nr_hugepages_mempolicy_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return nr_hugepages_show_common(kobj, attr, buf);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
static ssize_t nr_hugepages_mempolicy_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t len)
{
return nr_hugepages_store_common(true, kobj, buf, len);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 36 | 100.00% | 1 | 100.00% |
| Total | 36 | 100.00% | 1 | 100.00% |
HSTATE_ATTR(nr_hugepages_mempolicy);
#endif
static ssize_t nr_overcommit_hugepages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct hstate *h = kobj_to_hstate(kobj, NULL);
return sprintf(buf, "%lu\n", h->nr_overcommit_huge_pages);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 42 | 95.45% | 1 | 50.00% |
| Lee Schermerhorn | 2 | 4.55% | 1 | 50.00% |
| Total | 44 | 100.00% | 2 | 100.00% |
static ssize_t nr_overcommit_hugepages_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count)
{
int err;
unsigned long input;
struct hstate *h = kobj_to_hstate(kobj, NULL);
if (hstate_is_gigantic(h))
return -EINVAL;
err = kstrtoul(buf, 10, &input);
if (err)
return err;
spin_lock(&hugetlb_lock);
h->nr_overcommit_huge_pages = input;
spin_unlock(&hugetlb_lock);
return count;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 73 | 77.66% | 1 | 14.29% |
| Eric B Munson | 9 | 9.57% | 2 | 28.57% |
| Andi Kleen | 6 | 6.38% | 1 | 14.29% |
| Luiz Fernando N. Capitulino | 3 | 3.19% | 1 | 14.29% |
| Lee Schermerhorn | 2 | 2.13% | 1 | 14.29% |
| Jingoo Han | 1 | 1.06% | 1 | 14.29% |
| Total | 94 | 100.00% | 7 | 100.00% |
HSTATE_ATTR(nr_overcommit_hugepages);
static ssize_t free_hugepages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct hstate *h;
unsigned long free_huge_pages;
int nid;
h = kobj_to_hstate(kobj, &nid);
if (nid == NUMA_NO_NODE)
free_huge_pages = h->free_huge_pages;
else
free_huge_pages = h->free_huge_pages_node[nid];
return sprintf(buf, "%lu\n", free_huge_pages);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 36 | 48.65% | 1 | 20.00% |
| Nishanth Aravamudan | 35 | 47.30% | 2 | 40.00% |
| Andy Whitcroft | 2 | 2.70% | 1 | 20.00% |
| Andi Kleen | 1 | 1.35% | 1 | 20.00% |
| Total | 74 | 100.00% | 5 | 100.00% |
HSTATE_ATTR_RO(free_hugepages);
static ssize_t resv_hugepages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct hstate *h = kobj_to_hstate(kobj, NULL);
return sprintf(buf, "%lu\n", h->resv_huge_pages);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 41 | 93.18% | 2 | 50.00% |
| Lee Schermerhorn | 2 | 4.55% | 1 | 25.00% |
| Andy Whitcroft | 1 | 2.27% | 1 | 25.00% |
| Total | 44 | 100.00% | 4 | 100.00% |
HSTATE_ATTR_RO(resv_hugepages);
static ssize_t surplus_hugepages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct hstate *h;
unsigned long surplus_huge_pages;
int nid;
h = kobj_to_hstate(kobj, &nid);
if (nid == NUMA_NO_NODE)
surplus_huge_pages = h->surplus_huge_pages;
else
surplus_huge_pages = h->surplus_huge_pages_node[nid];
return sprintf(buf, "%lu\n", surplus_huge_pages);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 38 | 51.35% | 2 | 66.67% |
| Lee Schermerhorn | 36 | 48.65% | 1 | 33.33% |
| Total | 74 | 100.00% | 3 | 100.00% |
HSTATE_ATTR_RO(surplus_hugepages);
static struct attribute *hstate_attrs[] = {
&nr_hugepages_attr.attr,
&nr_overcommit_hugepages_attr.attr,
&free_hugepages_attr.attr,
&resv_hugepages_attr.attr,
&surplus_hugepages_attr.attr,
#ifdef CONFIG_NUMA
&nr_hugepages_mempolicy_attr.attr,
#endif
NULL,
};
static struct attribute_group hstate_attr_group = {
.attrs = hstate_attrs,
};
static int hugetlb_sysfs_add_hstate(struct hstate *h, struct kobject *parent,
struct kobject **hstate_kobjs,
struct attribute_group *hstate_attr_group)
{
int retval;
int hi = hstate_index(h);
hstate_kobjs[hi] = kobject_create_and_add(h->name, parent);
if (!hstate_kobjs[hi])
return -ENOMEM;
retval = sysfs_create_group(hstate_kobjs[hi], hstate_attr_group);
if (retval)
kobject_put(hstate_kobjs[hi]);
return retval;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 46 | 50.55% | 1 | 16.67% |
| Lee Schermerhorn | 27 | 29.67% | 1 | 16.67% |
| Andrew Morton | 8 | 8.79% | 1 | 16.67% |
| Andy Whitcroft | 6 | 6.59% | 1 | 16.67% |
| Aneesh Kumar K.V | 3 | 3.30% | 1 | 16.67% |
| Adam Litke | 1 | 1.10% | 1 | 16.67% |
| Total | 91 | 100.00% | 6 | 100.00% |
static void __init hugetlb_sysfs_init(void)
{
struct hstate *h;
int err;
hugepages_kobj = kobject_create_and_add("hugepages", mm_kobj);
if (!hugepages_kobj)
return;
for_each_hstate(h) {
err = hugetlb_sysfs_add_hstate(h, hugepages_kobj,
hstate_kobjs, &hstate_attr_group);
if (err)
pr_err("Hugetlb: Unable to add hstate %s", h->name);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 27 | 41.54% | 1 | 14.29% |
| Andy Whitcroft | 19 | 29.23% | 1 | 14.29% |
| Andi Kleen | 7 | 10.77% | 2 | 28.57% |
| Lee Schermerhorn | 7 | 10.77% | 1 | 14.29% |
| Kenneth W. Chen | 4 | 6.15% | 1 | 14.29% |
| Andrew Morton | 1 | 1.54% | 1 | 14.29% |
| Total | 65 | 100.00% | 7 | 100.00% |
#ifdef CONFIG_NUMA
/*
* node_hstate/s - associate per node hstate attributes, via their kobjects,
* with node devices in node_devices[] using a parallel array. The array
* index of a node device or _hstate == node id.
* This is here to avoid any static dependency of the node device driver, in
* the base kernel, on the hugetlb module.
*/
struct node_hstate {
struct kobject *hugepages_kobj;
struct kobject *hstate_kobjs[HUGE_MAX_HSTATE];
};
static struct node_hstate node_hstates[MAX_NUMNODES];
/*
* A subset of global hstate attributes for node devices
*/
static struct attribute *per_node_hstate_attrs[] = {
&nr_hugepages_attr.attr,
&free_hugepages_attr.attr,
&surplus_hugepages_attr.attr,
NULL,
};
static struct attribute_group per_node_hstate_attr_group = {
.attrs = per_node_hstate_attrs,
};
/*
* kobj_to_node_hstate - lookup global hstate for node device hstate attr kobj.
* Returns node id via non-NULL nidp.
*/
static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp)
{
int nid;
for (nid = 0; nid < nr_node_ids; nid++) {
struct node_hstate *nhs = &node_hstates[nid];
int i;
for (i = 0; i < HUGE_MAX_HSTATE; i++)
if (nhs->hstate_kobjs[i] == kobj) {
if (nidp)
*nidp = nid;
return &hstates[i];
}
}
BUG();
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 97 | 100.00% | 1 | 100.00% |
| Total | 97 | 100.00% | 1 | 100.00% |
/*
* Unregister hstate attributes from a single node device.
* No-op if no hstate attributes attached.
*/
static void hugetlb_unregister_node(struct node *node)
{
struct hstate *h;
struct node_hstate *nhs = &node_hstates[node->dev.id];
if (!nhs->hugepages_kobj)
return; /* no hstate attributes */
for_each_hstate(h) {
int idx = hstate_index(h);
if (nhs->hstate_kobjs[idx]) {
kobject_put(nhs->hstate_kobjs[idx]);
nhs->hstate_kobjs[idx] = NULL;
}
}
kobject_put(nhs->hugepages_kobj);
nhs->hugepages_kobj = NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 82 | 84.54% | 2 | 40.00% |
| Aneesh Kumar K.V | 13 | 13.40% | 1 | 20.00% |
| Kay Sievers | 1 | 1.03% | 1 | 20.00% |
| Claudiu Ghioc | 1 | 1.03% | 1 | 20.00% |
| Total | 97 | 100.00% | 5 | 100.00% |
/*
* Register hstate attributes for a single node device.
* No-op if attributes already registered.
*/
static void hugetlb_register_node(struct node *node)
{
struct hstate *h;
struct node_hstate *nhs = &node_hstates[node->dev.id];
int err;
if (nhs->hugepages_kobj)
return; /* already allocated */
nhs->hugepages_kobj = kobject_create_and_add("hugepages",
&node->dev.kobj);
if (!nhs->hugepages_kobj)
return;
for_each_hstate(h) {
err = hugetlb_sysfs_add_hstate(h, nhs->hugepages_kobj,
nhs->hstate_kobjs,
&per_node_hstate_attr_group);
if (err) {
pr_err("Hugetlb: Unable to add hstate %s for node %d\n",
h->name, node->dev.id);
hugetlb_unregister_node(node);
break;
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 111 | 94.87% | 1 | 25.00% |
| Kay Sievers | 3 | 2.56% | 1 | 25.00% |
| Andrew Morton | 2 | 1.71% | 1 | 25.00% |
| Claudiu Ghioc | 1 | 0.85% | 1 | 25.00% |
| Total | 117 | 100.00% | 4 | 100.00% |
/*
* hugetlb init time: register hstate attributes for all registered node
* devices of nodes that have memory. All on-line nodes should have
* registered their associated device by this time.
*/
static void __init hugetlb_register_all_nodes(void)
{
int nid;
for_each_node_state(nid, N_MEMORY) {
struct node *node = node_devices[nid];
if (node->dev.id == nid)
hugetlb_register_node(node);
}
/*
* Let the node device driver know we're here so it can
* [un]register hstate attributes on node hotplug.
*/
register_hugetlbfs_with_node(hugetlb_register_node,
hugetlb_unregister_node);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 49 | 92.45% | 2 | 40.00% |
| Kay Sievers | 2 | 3.77% | 1 | 20.00% |
| Lai Jiangshan | 1 | 1.89% | 1 | 20.00% |
| Luiz Fernando N. Capitulino | 1 | 1.89% | 1 | 20.00% |
| Total | 53 | 100.00% | 5 | 100.00% |
#else /* !CONFIG_NUMA */
static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp)
{
BUG();
if (nidp)
*nidp = -1;
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 33 | 100.00% | 1 | 100.00% |
| Total | 33 | 100.00% | 1 | 100.00% |
static void hugetlb_register_all_nodes(void) { }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 7 | 100.00% | 1 | 100.00% |
| Total | 7 | 100.00% | 1 | 100.00% |
#endif
static int __init hugetlb_init(void)
{
int i;
if (!hugepages_supported())
return 0;
if (!size_to_hstate(default_hstate_size)) {
default_hstate_size = HPAGE_SIZE;
if (!size_to_hstate(default_hstate_size))
hugetlb_add_hstate(HUGETLB_PAGE_ORDER);
}
default_hstate_idx = hstate_index(size_to_hstate(default_hstate_size));
if (default_hstate_max_huge_pages) {
if (!default_hstate.max_huge_pages)
default_hstate.max_huge_pages = default_hstate_max_huge_pages;
}
hugetlb_init_hstates();
gather_bootmem_prealloc();
report_hugepages();
hugetlb_sysfs_init();
hugetlb_register_all_nodes();
hugetlb_cgroup_file_init();
#ifdef CONFIG_SMP
num_fault_mutexes = roundup_pow_of_two(8 * num_possible_cpus());
#else
num_fault_mutexes = 1;
#endif
hugetlb_fault_mutex_table =
kmalloc(sizeof(struct mutex) * num_fault_mutexes, GFP_KERNEL);
BUG_ON(!hugetlb_fault_mutex_table);
for (i = 0; i < num_fault_mutexes; i++)
mutex_init(&hugetlb_fault_mutex_table[i]);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Davidlohr Bueso A | 64 | 39.51% | 1 | 7.69% |
| Nishanth Aravamudan | 35 | 21.60% | 2 | 15.38% |
| Nicholas Piggin | 24 | 14.81% | 1 | 7.69% |
| Vaishali Thakkar | 9 | 5.56% | 1 | 7.69% |
| Mel Gorman | 7 | 4.32% | 1 | 7.69% |
| Benjamin Herrenschmidt | 6 | 3.70% | 1 | 7.69% |
| Andi Kleen | 5 | 3.09% | 2 | 15.38% |
| Mike Kravetz | 3 | 1.85% | 1 | 7.69% |
| Jianguo Wu | 3 | 1.85% | 1 | 7.69% |
| Lee Schermerhorn | 3 | 1.85% | 1 | 7.69% |
| Aneesh Kumar K.V | 3 | 1.85% | 1 | 7.69% |
| Total | 162 | 100.00% | 13 | 100.00% |
subsys_initcall(hugetlb_init);
/* Should be called on processing a hugepagesz=... option */
void __init hugetlb_bad_size(void)
{
parsed_valid_hugepagesz = false;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Vaishali Thakkar | 12 | 100.00% | 1 | 100.00% |
| Total | 12 | 100.00% | 1 | 100.00% |
void __init hugetlb_add_hstate(unsigned int order)
{
struct hstate *h;
unsigned long i;
if (size_to_hstate(PAGE_SIZE << order)) {
pr_warn("hugepagesz= specified twice, ignoring\n");
return;
}
BUG_ON(hugetlb_max_hstate >= HUGE_MAX_HSTATE);
BUG_ON(order == 0);
h = &hstates[hugetlb_max_hstate++];
h->order = order;
h->mask = ~((1ULL << (order + PAGE_SHIFT)) - 1);
h->nr_huge_pages = 0;
h->free_huge_pages = 0;
for (i = 0; i < MAX_NUMNODES; ++i)
INIT_LIST_HEAD(&h->hugepage_freelists[i]);
INIT_LIST_HEAD(&h->hugepage_activelist);
h->next_nid_to_alloc = first_memory_node;
h->next_nid_to_free = first_memory_node;
snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB",
huge_page_size(h)/1024);
parsed_hstate = h;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 70 | 43.21% | 1 | 7.69% |
| Andi Kleen | 54 | 33.33% | 2 | 15.38% |
| Mel Gorman | 11 | 6.79% | 2 | 15.38% |
| Aneesh Kumar K.V | 10 | 6.17% | 2 | 15.38% |
| Andy Whitcroft | 6 | 3.70% | 1 | 7.69% |
| Lee Schermerhorn | 6 | 3.70% | 1 | 7.69% |
| Andrew Morton | 3 | 1.85% | 2 | 15.38% |
| Joe Perches | 1 | 0.62% | 1 | 7.69% |
| Kirill A. Shutemov | 1 | 0.62% | 1 | 7.69% |
| Total | 162 | 100.00% | 13 | 100.00% |
static int __init hugetlb_nrpages_setup(char *s)
{
unsigned long *mhp;
static unsigned long *last_mhp;
if (!parsed_valid_hugepagesz) {
pr_warn("hugepages = %s preceded by "
"an unsupported hugepagesz, ignoring\n", s);
parsed_valid_hugepagesz = true;
return 1;
}
/*
* !hugetlb_max_hstate means we haven't parsed a hugepagesz= parameter yet,
* so this hugepages= parameter goes to the "default hstate".
*/
else if (!hugetlb_max_hstate)
mhp = &default_hstate_max_huge_pages;
else
mhp = &parsed_hstate->max_huge_pages;
if (mhp == last_mhp) {
pr_warn("hugepages= specified twice without interleaving hugepagesz=, ignoring\n");
return 1;
}
if (sscanf(s, "%lu", mhp) <= 0)
*mhp = 0;
/*
* Global state is always initialized later in hugetlb_init.
* But we need to allocate >= MAX_ORDER hstates here early to still
* use the bootmem allocator.
*/
if (hugetlb_max_hstate && parsed_hstate->order >= MAX_ORDER)
hugetlb_hstate_alloc_pages(parsed_hstate);
last_mhp = mhp;
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 40 | 33.06% | 2 | 20.00% |
| Nishanth Aravamudan | 38 | 31.40% | 1 | 10.00% |
| Vaishali Thakkar | 23 | 19.01% | 1 | 10.00% |
| David Gibson | 9 | 7.44% | 1 | 10.00% |
| Andy Whitcroft | 4 | 3.31% | 1 | 10.00% |
| Aneesh Kumar K.V | 3 | 2.48% | 1 | 10.00% |
| Joe Perches | 2 | 1.65% | 1 | 10.00% |
| Nicholas Piggin | 1 | 0.83% | 1 | 10.00% |
| Andrew Morton | 1 | 0.83% | 1 | 10.00% |
| Total | 121 | 100.00% | 10 | 100.00% |
__setup("hugepages=", hugetlb_nrpages_setup);
static int __init hugetlb_default_setup(char *s)
{
default_hstate_size = memparse(s, &s);
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicholas Piggin | 24 | 100.00% | 1 | 100.00% |
| Total | 24 | 100.00% | 1 | 100.00% |
__setup("default_hugepagesz=", hugetlb_default_setup);
static unsigned int cpuset_mems_nr(unsigned int *array)
{
int node;
unsigned int nr = 0;
for_each_node_mask(node, cpuset_current_mems_allowed)
nr += array[node];
return nr;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nishanth Aravamudan | 37 | 100.00% | 1 | 100.00% |
| Total | 37 | 100.00% | 1 | 100.00% |
#ifdef CONFIG_SYSCTL
static int hugetlb_sysctl_handler_common(bool obey_mempolicy,
struct ctl_table *table, int write,
void __user *buffer, size_t *length, loff_t *ppos)
{
struct hstate *h = &default_hstate;
unsigned long tmp = h->max_huge_pages;
int ret;
if (!hugepages_supported())
return -EOPNOTSUPP;
table->data = &tmp;
table->maxlen = sizeof(unsigned long);
ret = proc_doulongvec_minmax(table, write, buffer, length, ppos);
if (ret)
goto out;
if (write)
ret = __nr_hugepages_store_common(obey_mempolicy, h,
NUMA_NO_NODE, tmp, *length);
out:
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 36 | 29.27% | 1 | 10.00% |
| Andy Whitcroft | 28 | 22.76% | 1 | 10.00% |
| Michal Hocko | 15 | 12.20% | 1 | 10.00% |
| David Gibson | 15 | 12.20% | 1 | 10.00% |
| David Rientjes | 12 | 9.76% | 1 | 10.00% |
| Nishanth Aravamudan | 9 | 7.32% | 1 | 10.00% |
| Lee Schermerhorn | 6 | 4.88% | 2 | 20.00% |
| Benjamin Herrenschmidt | 1 | 0.81% | 1 | 10.00% |
| Jan Stancek | 1 | 0.81% | 1 | 10.00% |
| Total | 123 | 100.00% | 10 | 100.00% |
int hugetlb_sysctl_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *length, loff_t *ppos)
{
return hugetlb_sysctl_handler_common(false, table, write,
buffer, length, ppos);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 42 | 100.00% | 1 | 100.00% |
| Total | 42 | 100.00% | 1 | 100.00% |
#ifdef CONFIG_NUMA
int hugetlb_mempolicy_sysctl_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *length, loff_t *ppos)
{
return hugetlb_sysctl_handler_common(true, table, write,
buffer, length, ppos);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lee Schermerhorn | 42 | 100.00% | 1 | 100.00% |
| Total | 42 | 100.00% | 1 | 100.00% |
#endif /* CONFIG_NUMA */
int hugetlb_overcommit_handler(struct ctl_table *table, int write,
void __user *buffer,
size_t *length, loff_t *ppos)
{
struct hstate *h = &default_hstate;
unsigned long tmp;
int ret;
if (!hugepages_supported())
return -EOPNOTSUPP;
tmp = h->nr_overcommit_huge_pages;
if (write && hstate_is_gigantic(h))
return -EINVAL;
table->data = &tmp;
table->maxlen = sizeof(unsigned long);
ret = proc_doulongvec_minmax(table, write, buffer, length, ppos);
if (ret)
goto out;
if (write) {
spin_lock(&hugetlb_lock);
h->nr_overcommit_huge_pages = tmp;
spin_unlock(&hugetlb_lock);
}
out:
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 44 | 31.88% | 2 | 15.38% |
| Andy Whitcroft | 38 | 27.54% | 1 | 7.69% |
| Michal Hocko | 15 | 10.87% | 1 | 7.69% |
| Eric B Munson | 10 | 7.25% | 1 | 7.69% |
| Andrew Morton | 9 | 6.52% | 1 | 7.69% |
| Nishanth Aravamudan | 9 | 6.52% | 1 | 7.69% |
| David Gibson | 4 | 2.90% | 2 | 15.38% |
| Kenneth W. Chen | 4 | 2.90% | 1 | 7.69% |
| Luiz Fernando N. Capitulino | 3 | 2.17% | 1 | 7.69% |
| Mel Gorman | 1 | 0.72% | 1 | 7.69% |
| Jan Stancek | 1 | 0.72% | 1 | 7.69% |
| Total | 138 | 100.00% | 13 | 100.00% |
#endif /* CONFIG_SYSCTL */
void hugetlb_report_meminfo(struct seq_file *m)
{
struct hstate *h = &default_hstate;
if (!hugepages_supported())
return;
seq_printf(m,
"HugePages_Total: %5lu\n"
"HugePages_Free: %5lu\n"
"HugePages_Rsvd: %5lu\n"
"HugePages_Surp: %5lu\n"
"Hugepagesize: %8lu kB\n",
h->nr_huge_pages,
h->free_huge_pages,
h->resv_huge_pages,
h->surplus_huge_pages,
1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andi Kleen | 28 | 43.08% | 1 | 14.29% |
| Andy Whitcroft | 16 | 24.62% | 1 | 14.29% |
| Nishanth Aravamudan | 7 | 10.77% | 1 | 14.29% |
| Alexey Dobriyan | 7 | 10.77% | 1 | 14.29% |
| Rik Van Riel | 5 | 7.69% | 1 | 14.29% |
| David Gibson | 1 | 1.54% | 1 | 14.29% |
| Andrew Morton | 1 | 1.54% | 1 | 14.29% |
| Total | 65 | 100.00% | 7 | 100.00% |
int hugetlb_report_node_meminfo(int nid, char *buf)
{
struct hstate *h = &default_hstate;
if (!hugepages_supported())
return 0;
return sprintf(buf,
"Node %d HugePages_Total: %5u\n"
"Node %d HugePages_Free: %5u\n"
"Node %d HugePages_Surp: %5u\n",
nid, h->nr_huge_pages_node[nid],
nid, h->free_huge_pages_node[nid],
nid, h->surplus_huge_pages_node[nid]);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 41 | 62.12% | 1 | 25.00% |
| Andi Kleen | 14 | 21.21% | 1 | 25.00% |
| Nishanth Aravamudan | 9 | 13.64% | 1 | 25.00% |
| Hugh Dickins | 2 | 3.03% | 1 | 25.00% |
| Total | 66 | 100.00% | 4 | 100.00% |
void hugetlb_show_meminfo(void)
{
struct hstate *h;
int nid;
if (!hugepages_supported())
return;
for_each_node_state(nid, N_MEMORY)
for_each_hstate(h)
pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n",
nid,
h->nr_huge_pages_node[nid],
h->free_huge_pages_node[nid],
h->surplus_huge_pages_node[nid],
1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Rientjes | 66 | 90.41% | 1 | 50.00% |
| Nishanth Aravamudan | 7 | 9.59% | 1 | 50.00% |
| Total | 73 | 100.00% | 2 | 100.00% |
void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm)
{
seq_printf(m, "HugetlbPages:\t%8lu kB\n",
atomic_long_read(&mm->hugetlb_usage) << (PAGE_SHIFT - 10));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 36 | 100.00% | 1 | 100.00% |
| Total | 36 | 100.00% | 1 | 100.00% |
/* Return the number pages of memory we physically have, in PAGE_SIZE units. */
unsigned long hugetlb_total_pages(void)
{
struct hstate *h;
unsigned long nr_total_pages = 0;
for_each_hstate(h)
nr_total_pages += h->nr_huge_pages * pages_per_huge_page(h);
return nr_total_pages;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Wanpeng Li | 14 | 37.84% | 1 | 33.33% |
| Andi Kleen | 12 | 32.43% | 1 | 33.33% |
| Andy Whitcroft | 11 | 29.73% | 1 | 33.33% |
| Total | 37 | 100.00% | 3 | 100.00% |
static int hugetlb_acct_memory(struct hstate *h, long delta)
{
int ret = -ENOMEM;
spin_lock(&hugetlb_lock);
/*
* When cpuset is configured, it breaks the strict hugetlb page
* reservation as the accounting is done on a global variable. Such
* reservation is completely rubbish in the presence of cpuset because
* the reservation is not checked against page availability for the
* current cpuset. Application can still potentially OOM'ed by kernel
* with lack of free htlb page in cpuset that the task is in.
* Attempt to enforce strict accounting with cpuset is almost
* impossible (or too ugly) because cpuset is too fluid that
* task or memory node can be dynamically moved between cpusets.
*
* The change of semantics for shared hugetlb mapping with cpuset is
* undesirable. However, in order to preserve some of the semantics,
* we fall back to check against current free page availability as
* a best attempt and hopefully to minimize the impact of changing
* semantics that cpuset has.
*/
if (delta > 0) {
if (gather_surplus_pages(h, delta) < 0)
goto out;
if (delta > cpuset_mems_nr(h->free_huge_pages_node)) {
return_unused_surplus_pages(h, delta);
goto out;
}
}
ret = 0;
if (delta < 0)
return_unused_surplus_pages(h, (unsigned long) -delta);
out:
spin_unlock(&hugetlb_lock);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 66 | 62.86% | 1 | 16.67% |
| Mel Gorman | 14 | 13.33% | 1 | 16.67% |
| Andi Kleen | 13 | 12.38% | 1 | 16.67% |
| David Gibson | 7 | 6.67% | 2 | 33.33% |
| Kenneth W. Chen | 5 | 4.76% | 1 | 16.67% |
| Total | 105 | 100.00% | 6 | 100.00% |
static void hugetlb_vm_op_open(struct vm_area_struct *vma)
{
struct resv_map *resv = vma_resv_map(vma);
/*
* This new VMA should share its siblings reservation map if present.
* The VMA will only ever have a valid reservation map pointer where
* it is being copied for another still existing VMA. As that VMA
* has a reference to the reservation map it cannot disappear until
* after this open call completes. It is therefore safe to take a
* new reference here without additional locking.
*/
if (resv && is_vma_resv_set(vma, HPAGE_RESV_OWNER))
kref_get(&resv->refs);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 30 | 73.17% | 1 | 25.00% |
| JoonSoo Kim | 10 | 24.39% | 2 | 50.00% |
| Lucas De Marchi | 1 | 2.44% | 1 | 25.00% |
| Total | 41 | 100.00% | 4 | 100.00% |
static void hugetlb_vm_op_close(struct vm_area_struct *vma)
{
struct hstate *h = hstate_vma(vma);
struct resv_map *resv = vma_resv_map(vma);
struct hugepage_subpool *spool = subpool_vma(vma);
unsigned long reserve, start, end;
long gbl_reserve;
if (!resv || !is_vma_resv_set(vma, HPAGE_RESV_OWNER))
return;
start = vma_hugecache_offset(h, vma, vma->vm_start);
end = vma_hugecache_offset(h, vma, vma->vm_end);
reserve = (end - start) - region_count(resv, start, end);
kref_put(&resv->refs, resv_map_release);
if (reserve) {
/*
* Decrement reserve counts. The global reserve count may be
* adjusted if the subpool has a minimum size.
*/
gbl_reserve = hugepage_subpool_put_pages(spool, reserve);
hugetlb_acct_memory(h, -gbl_reserve);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 69 | 48.25% | 2 | 18.18% |
| JoonSoo Kim | 22 | 15.38% | 3 | 27.27% |
| Andi Kleen | 15 | 10.49% | 1 | 9.09% |
| Mike Kravetz | 12 | 8.39% | 1 | 9.09% |
| David Gibson | 10 | 6.99% | 1 | 9.09% |
| Mel Gorman | 7 | 4.90% | 1 | 9.09% |
| Adam Litke | 6 | 4.20% | 1 | 9.09% |
| Johannes Weiner | 2 | 1.40% | 1 | 9.09% |
| Total | 143 | 100.00% | 11 | 100.00% |
/*
* We cannot handle pagefaults against hugetlb pages at all. They cause
* handle_mm_fault() to try to instantiate regular-sized pages in the
* hugegpage VMA. do_page_fault() is supposed to trap this, so BUG is we get
* this far.
*/
static int hugetlb_vm_op_fault(struct vm_fault *vmf)
{
BUG();
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 16 | 94.12% | 1 | 50.00% |
| David Gibson | 1 | 5.88% | 1 | 50.00% |
| Total | 17 | 100.00% | 2 | 100.00% |
const struct vm_operations_struct hugetlb_vm_ops = {
.fault = hugetlb_vm_op_fault,
.open = hugetlb_vm_op_open,
.close = hugetlb_vm_op_close,
};
static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page,
int writable)
{
pte_t entry;
if (writable) {
entry = huge_pte_mkwrite(huge_pte_mkdirty(mk_huge_pte(page,
vma->vm_page_prot)));
} else {
entry = huge_pte_wrprotect(mk_huge_pte(page,
vma->vm_page_prot));
}
entry = pte_mkyoung(entry);
entry = pte_mkhuge(entry);
entry = arch_make_huge_pte(entry, vma, page, writable);
return entry;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 51 | 55.43% | 1 | 14.29% |
| Chris Metcalf | 13 | 14.13% | 1 | 14.29% |
| David Gibson | 13 | 14.13% | 1 | 14.29% |
| Kenneth W. Chen | 8 | 8.70% | 1 | 14.29% |
| Gerald Schaefer | 4 | 4.35% | 1 | 14.29% |
| Ken Chen | 2 | 2.17% | 1 | 14.29% |
| Hugh Dickins | 1 | 1.09% | 1 | 14.29% |
| Total | 92 | 100.00% | 7 | 100.00% |
static void set_huge_ptep_writable(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
pte_t entry;
entry = huge_pte_mkwrite(huge_pte_mkdirty(huge_ptep_get(ptep)));
if (huge_ptep_set_access_flags(vma, address, ptep, entry, 1))
update_mmu_cache(vma, address, ptep);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 29 | 49.15% | 1 | 20.00% |
| Kenneth W. Chen | 24 | 40.68% | 1 | 20.00% |
| Mel Gorman | 3 | 5.08% | 1 | 20.00% |
| Gerald Schaefer | 2 | 3.39% | 1 | 20.00% |
| Russell King | 1 | 1.69% | 1 | 20.00% |
| Total | 59 | 100.00% | 5 | 100.00% |
static int is_hugetlb_entry_migration(pte_t pte)
{
swp_entry_t swp;
if (huge_pte_none(pte) || pte_present(pte))
return 0;
swp = pte_to_swp_entry(pte);
if (non_swap_entry(swp) && is_migration_entry(swp))
return 1;
else
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 53 | 100.00% | 1 | 100.00% |
| Total | 53 | 100.00% | 1 | 100.00% |
static int is_hugetlb_entry_hwpoisoned(pte_t pte)
{
swp_entry_t swp;
if (huge_pte_none(pte) || pte_present(pte))
return 0;
swp = pte_to_swp_entry(pte);
if (non_swap_entry(swp) && is_hwpoison_entry(swp))
return 1;
else
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 53 | 100.00% | 1 | 100.00% |
| Total | 53 | 100.00% | 1 | 100.00% |
int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
struct vm_area_struct *vma)
{
pte_t *src_pte, *dst_pte, entry;
struct page *ptepage;
unsigned long addr;
int cow;
struct hstate *h = hstate_vma(vma);
unsigned long sz = huge_page_size(h);
unsigned long mmun_start; /* For mmu_notifiers */
unsigned long mmun_end; /* For mmu_notifiers */
int ret = 0;
cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
mmun_start = vma->vm_start;
mmun_end = vma->vm_end;
if (cow)
mmu_notifier_invalidate_range_start(src, mmun_start, mmun_end);
for (addr = vma->vm_start; addr < vma->vm_end; addr += sz) {
spinlock_t *src_ptl, *dst_ptl;
src_pte = huge_pte_offset(src, addr);
if (!src_pte)
continue;
dst_pte = huge_pte_alloc(dst, addr, sz);
if (!dst_pte) {
ret = -ENOMEM;
break;
}
/* If the pagetables are shared don't copy or take references */
if (dst_pte == src_pte)
continue;
dst_ptl = huge_pte_lock(h, dst, dst_pte);
src_ptl = huge_pte_lockptr(h, src, src_pte);
spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING);
entry = huge_ptep_get(src_pte);
if (huge_pte_none(entry)) { /* skip none entry */
;
} else if (unlikely(is_hugetlb_entry_migration(entry) ||
is_hugetlb_entry_hwpoisoned(entry))) {
swp_entry_t swp_entry = pte_to_swp_entry(entry);
if (is_write_migration_entry(swp_entry) && cow) {
/*
* COW mappings require pages in both
* parent and child to be set to read.
*/
make_migration_entry_read(&swp_entry);
entry = swp_entry_to_pte(swp_entry);
set_huge_pte_at(src, addr, src_pte, entry);
}
set_huge_pte_at(dst, addr, dst_pte, entry);
} else {
if (cow) {
huge_ptep_set_wrprotect(src, addr, src_pte);
mmu_notifier_invalidate_range(src, mmun_start,
mmun_end);
}
entry = huge_ptep_get(src_pte);
ptepage = pte_page(entry);
get_page(ptepage);
page_dup_rmap(ptepage, true);
set_huge_pte_at(dst, addr, dst_pte, entry);
hugetlb_count_add(pages_per_huge_page(h), dst);
}
spin_unlock(src_ptl);
spin_unlock(dst_ptl);
}
if (cow)
mmu_notifier_invalidate_range_end(src, mmun_start, mmun_end);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 128 | 31.22% | 1 | 8.33% |
| Naoya Horiguchi | 102 | 24.88% | 4 | 33.33% |
| Andreas Sandberg | 62 | 15.12% | 1 | 8.33% |
| Mel Gorman | 40 | 9.76% | 1 | 8.33% |
| Kirill A. Shutemov | 30 | 7.32% | 2 | 16.67% |
| Andi Kleen | 22 | 5.37% | 1 | 8.33% |
| David Gibson | 15 | 3.66% | 1 | 8.33% |
| Joerg Roedel | 11 | 2.68% | 1 | 8.33% |
| Total | 410 | 100.00% | 12 | 100.00% |
void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
unsigned long start, unsigned long end,
struct page *ref_page)
{
struct mm_struct *mm = vma->vm_mm;
unsigned long address;
pte_t *ptep;
pte_t pte;
spinlock_t *ptl;
struct page *page;
struct hstate *h = hstate_vma(vma);
unsigned long sz = huge_page_size(h);
const unsigned long mmun_start = start; /* For mmu_notifiers */
const unsigned long mmun_end = end; /* For mmu_notifiers */
WARN_ON(!is_vm_hugetlb_page(vma));
BUG_ON(start & ~huge_page_mask(h));
BUG_ON(end & ~huge_page_mask(h));
/*
* This is a hugetlb vma, all the pte entries should point
* to huge page.
*/
tlb_remove_check_page_size_change(tlb, sz);
tlb_start_vma(tlb, vma);
mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
address = start;
for (; address < end; address += sz) {
ptep = huge_pte_offset(mm, address);
if (!ptep)
continue;
ptl = huge_pte_lock(h, mm, ptep);
if (huge_pmd_unshare(mm, &address, ptep)) {
spin_unlock(ptl);
continue;
}
pte = huge_ptep_get(ptep);
if (huge_pte_none(pte)) {
spin_unlock(ptl);
continue;
}
/*
* Migrating hugepage or HWPoisoned hugepage is already
* unmapped and its refcount is dropped, so just clear pte here.
*/
if (unlikely(!pte_present(pte))) {
huge_pte_clear(mm, address, ptep);
spin_unlock(ptl);
continue;
}
page = pte_page(pte);
/*
* If a reference page is supplied, it is because a specific
* page is being unmapped, not a range. Ensure the page we
* are about to unmap is the actual page of interest.
*/
if (ref_page) {
if (page != ref_page) {
spin_unlock(ptl);
continue;
}
/*
* Mark the VMA as having unmapped its page so that
* future faults in this VMA will fail rather than
* looking like data was lost
*/
set_vma_resv_flags(vma, HPAGE_RESV_UNMAPPED);
}
pte = huge_ptep_get_and_clear(mm, address, ptep);
tlb_remove_huge_tlb_entry(h, tlb, ptep, address);
if (huge_pte_dirty(pte))
set_page_dirty(page);
hugetlb_count_sub(pages_per_huge_page(h), mm);
page_remove_rmap(page, true);
spin_unlock(ptl);
tlb_remove_page_size(tlb, page, huge_page_size(h));
/*
* Bail out after unmapping reference page if supplied
*/
if (ref_page)
break;
}
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
tlb_end_vma(tlb, vma);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 111 | 28.68% | 1 | 4.35% |
| Aneesh Kumar K.V | 83 | 21.45% | 5 | 21.74% |
| Mel Gorman | 44 | 11.37% | 1 | 4.35% |
| Andi Kleen | 27 | 6.98% | 1 | 4.35% |
| Kirill A. Shutemov | 23 | 5.94% | 2 | 8.70% |
| Naoya Horiguchi | 23 | 5.94% | 3 | 13.04% |
| Sagi Grimberg | 20 | 5.17% | 1 | 4.35% |
| Hillf Danton | 19 | 4.91% | 2 | 8.70% |
| Andrea Arcangeli | 14 | 3.62% | 1 | 4.35% |
| David Gibson | 13 | 3.36% | 1 | 4.35% |
| Christoph Lameter | 4 | 1.03% | 1 | 4.35% |
| Gerald Schaefer | 2 | 0.52% | 1 | 4.35% |
| Al Viro | 2 | 0.52% | 1 | 4.35% |
| Adam Litke | 1 | 0.26% | 1 | 4.35% |
| Nicholas Piggin | 1 | 0.26% | 1 | 4.35% |
| Total | 387 | 100.00% | 23 | 100.00% |
void __unmap_hugepage_range_final(struct mmu_gather *tlb,
struct vm_area_struct *vma, unsigned long start,
unsigned long end, struct page *ref_page)
{
__unmap_hugepage_range(tlb, vma, start, end, ref_page);
/*
* Clear this flag so that x86's huge_pmd_share page_table_shareable
* test will fail on a vma being torn down, and not grab a page table
* on its way out. We're lucky that the flag has such an appropriate
* name, and can in fact be safely cleared here. We could clear it
* before the __unmap_hugepage_range above, but all that's necessary
* is to clear it before releasing the i_mmap_rwsem. This works
* because in the context this is called, the VMA is about to be
* destroyed and the i_mmap_rwsem is held.
*/
vma->vm_flags &= ~VM_MAYSHARE;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mel Gorman | 48 | 97.96% | 1 | 50.00% |
| Davidlohr Bueso A | 1 | 2.04% | 1 | 50.00% |
| Total | 49 | 100.00% | 2 | 100.00% |
void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end, struct page *ref_page)
{
struct mm_struct *mm;
struct mmu_gather tlb;
mm = vma->vm_mm;
tlb_gather_mmu(&tlb, mm, start, end);
__unmap_hugepage_range(&tlb, vma, start, end, ref_page);
tlb_finish_mmu(&tlb, start, end);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 30 | 40.54% | 1 | 20.00% |
| Aneesh Kumar K.V | 29 | 39.19% | 1 | 20.00% |
| David Gibson | 9 | 12.16% | 1 | 20.00% |
| Gerald Schaefer | 3 | 4.05% | 1 | 20.00% |
| Linus Torvalds | 3 | 4.05% | 1 | 20.00% |
| Total | 74 | 100.00% | 5 | 100.00% |
/*
* This is called when the original mapper is failing to COW a MAP_PRIVATE
* mappping it owns the reserve page for. The intention is to unmap the page
* from other VMAs and let the children be SIGKILLed if they are faulting the
* same region.
*/
static void unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
struct page *page, unsigned long address)
{
struct hstate *h = hstate_vma(vma);
struct vm_area_struct *iter_vma;
struct address_space *mapping;
pgoff_t pgoff;
/*
* vm_pgoff is in PAGE_SIZE units, hence the different calculation
* from page cache lookup which is in HPAGE_SIZE units.
*/
address = address & huge_page_mask(h);
pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) +
vma->vm_pgoff;
mapping = vma->vm_file->f_mapping;
/*
* Take the mapping lock for the duration of the table walk. As
* this mapping should be shared between all the VMAs,
* __unmap_hugepage_range() is called as the lock is already held
*/
i_mmap_lock_write(mapping);
vma_interval_tree_foreach(iter_vma, &mapping->i_mmap, pgoff, pgoff) {
/* Do not unmap the current VMA */
if (iter_vma == vma)
continue;
/*
* Shared VMAs have their own reserves and do not affect
* MAP_PRIVATE accounting but it is possible that a shared
* VMA is using the same page so check and skip such VMAs.
*/
if (iter_vma->vm_flags & VM_MAYSHARE)
continue;
/*
* Unmap the page from other VMAs without their own reserves.
* They get marked to be SIGKILLed if they fault in these
* areas. This is because a future no-page fault on this VMA
* could insert a zeroed page instead of the data existing
* from the time of fork. This would look like data corruption
*/
if (!is_vma_resv_set(iter_vma, HPAGE_RESV_OWNER))
unmap_hugepage_range(iter_vma, address,
address + huge_page_size(h), page);
}
i_mmap_unlock_write(mapping);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 66 | 43.42% | 2 | 13.33% |
| Mel Gorman | 45 | 29.61% | 3 | 20.00% |
| Adam Litke | 15 | 9.87% | 1 | 6.67% |
| Michal Hocko | 14 | 9.21% | 1 | 6.67% |
| David Gibson | 4 | 2.63% | 1 | 6.67% |
| Davidlohr Bueso A | 3 | 1.97% | 2 | 13.33% |
| Harvey Harrison | 1 | 0.66% | 1 | 6.67% |
| Al Viro | 1 | 0.66% | 1 | 6.67% |
| Aneesh Kumar K.V | 1 | 0.66% | 1 | 6.67% |
| Hillf Danton | 1 | 0.66% | 1 | 6.67% |
| Michel Lespinasse | 1 | 0.66% | 1 | 6.67% |
| Total | 152 | 100.00% | 15 | 100.00% |
/*
* Hugetlb_cow() should be called with page lock of the original hugepage held.
* Called with hugetlb_instantiation_mutex held and pte_page locked so we
* cannot race with other handlers or page migration.
* Keep the pte_same checks anyway to make transition from the mutex easier.
*/
static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, pte_t *ptep,
struct page *pagecache_page, spinlock_t *ptl)
{
pte_t pte;
struct hstate *h = hstate_vma(vma);
struct page *old_page, *new_page;
int ret = 0, outside_reserve = 0;
unsigned long mmun_start; /* For mmu_notifiers */
unsigned long mmun_end; /* For mmu_notifiers */
pte = huge_ptep_get(ptep);
old_page = pte_page(pte);
retry_avoidcopy:
/* If no-one else is actually using this page, avoid the copy
* and just make the page writable */
if (page_mapcount(old_page) == 1 && PageAnon(old_page)) {
page_move_anon_rmap(old_page, vma);
set_huge_ptep_writable(vma, address, ptep);
return 0;
}
/*
* If the process that created a MAP_PRIVATE mapping is about to
* perform a COW due to a shared page count, attempt to satisfy
* the allocation without using the existing reserves. The pagecache
* page is used to determine if the reserve at this address was
* consumed or not. If reserves were used, a partial faulted mapping
* at the time of fork() could consume its reserves on COW instead
* of the full address range.
*/
if (is_vma_resv_set(vma, HPAGE_RESV_OWNER) &&
old_page != pagecache_page)
outside_reserve = 1;
get_page(old_page);
/*
* Drop page table lock as buddy allocator may be called. It will
* be acquired again before returning to the caller, as expected.
*/
spin_unlock(ptl);
new_page = alloc_huge_page(vma, address, outside_reserve);
if (IS_ERR(new_page)) {
/*
* If a process owning a MAP_PRIVATE mapping fails to COW,
* it is due to references held by a child and an insufficient
* huge page pool. To guarantee the original mappers
* reliability, unmap the page from child processes. The child
* may get SIGKILLed if it later faults.
*/
if (outside_reserve) {
put_page(old_page);
BUG_ON(huge_pte_none(pte));
unmap_ref_private(mm, vma, old_page, address);
BUG_ON(huge_pte_none(pte));
spin_lock(ptl);
ptep = huge_pte_offset(mm, address & huge_page_mask(h));
if (likely(ptep &&
pte_same(huge_ptep_get(ptep), pte)))
goto retry_avoidcopy;
/*
* race occurs while re-acquiring page table
* lock, and our job is done.
*/
return 0;
}
ret = (PTR_ERR(new_page) == -ENOMEM) ?
VM_FAULT_OOM : VM_FAULT_SIGBUS;
goto out_release_old;
}
/*
* When the original hugepage is shared one, it does not have
* anon_vma prepared.
*/
if (unlikely(anon_vma_prepare(vma))) {
ret = VM_FAULT_OOM;
goto out_release_all;
}
copy_user_huge_page(new_page, old_page, address, vma,
pages_per_huge_page(h));
__SetPageUptodate(new_page);
set_page_huge_active(new_page);
mmun_start = address & huge_page_mask(h);
mmun_end = mmun_start + huge_page_size(h);
mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
/*
* Retake the page table lock to check for racing updates
* before the page tables are altered
*/
spin_lock(ptl);
ptep = huge_pte_offset(mm, address & huge_page_mask(h));
if (likely(ptep && pte_same(huge_ptep_get(ptep), pte))) {
ClearPagePrivate(new_page);
/* Break COW */
huge_ptep_clear_flush(vma, address, ptep);
mmu_notifier_invalidate_range(mm, mmun_start, mmun_end);
set_huge_pte_at(mm, address, ptep,
make_huge_pte(vma, new_page, 1));
page_remove_rmap(old_page, true);
hugepage_add_new_anon_rmap(new_page, vma, address);
/* Make the old page be freed below */
new_page = old_page;
}
spin_unlock(ptl);
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
out_release_all:
restore_reserve_on_error(h, vma, address, new_page);
put_page(new_page);
out_release_old:
put_page(old_page);
spin_lock(ptl); /* Caller expects lock to be held */
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 115 | 23.09% | 2 | 5.13% |
| Naoya Horiguchi | 49 | 9.84% | 5 | 12.82% |
| Sagi Grimberg | 45 | 9.04% | 1 | 2.56% |
| David Gibson | 44 | 8.84% | 3 | 7.69% |
| Davidlohr Bueso A | 35 | 7.03% | 2 | 5.13% |
| Adam Litke | 33 | 6.63% | 3 | 7.69% |
| Hillf Danton | 32 | 6.43% | 1 | 2.56% |
| Christoph Lameter | 22 | 4.42% | 1 | 2.56% |
| Kirill A. Shutemov | 16 | 3.21% | 3 | 7.69% |
| Aneesh Kumar K.V | 14 | 2.81% | 2 | 5.13% |
| Andi Kleen | 14 | 2.81% | 1 | 2.56% |
| JoonSoo Kim | 13 | 2.61% | 3 | 7.69% |
| Mel Gorman | 11 | 2.21% | 1 | 2.56% |
| Mike Kravetz | 11 | 2.21% | 1 | 2.56% |
| Larry Woodman | 10 | 2.01% | 1 | 2.56% |
| Joerg Roedel | 9 | 1.81% | 1 | 2.56% |
| Doug Doan | 6 | 1.20% | 1 | 2.56% |
| Hugh Dickins | 5 | 1.00% | 2 | 5.13% |
| Andrea Arcangeli | 5 | 1.00% | 1 | 2.56% |
| Gerald Schaefer | 3 | 0.60% | 1 | 2.56% |
| Nicholas Piggin | 3 | 0.60% | 1 | 2.56% |
| Dean Nelson | 2 | 0.40% | 1 | 2.56% |
| Robert P. J. Day | 1 | 0.20% | 1 | 2.56% |
| Total | 498 | 100.00% | 39 | 100.00% |
/* Return the pagecache page at a given address within a VMA */
static struct page *hugetlbfs_pagecache_page(struct hstate *h,
struct vm_area_struct *vma, unsigned long address)
{
struct address_space *mapping;
pgoff_t idx;
mapping = vma->vm_file->f_mapping;
idx = vma_hugecache_offset(h, vma, address);
return find_lock_page(mapping, idx);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 41 | 71.93% | 1 | 20.00% |
| Andi Kleen | 7 | 12.28% | 1 | 20.00% |
| Hugh Dickins | 7 | 12.28% | 1 | 20.00% |
| David Gibson | 1 | 1.75% | 1 | 20.00% |
| Johannes Weiner | 1 | 1.75% | 1 | 20.00% |
| Total | 57 | 100.00% | 5 | 100.00% |
/*
* Return whether there is a pagecache page to back given address within VMA.
* Caller follow_hugetlb_page() holds page_table_lock so we cannot lock_page.
*/
static bool hugetlbfs_pagecache_present(struct hstate *h,
struct vm_area_struct *vma, unsigned long address)
{
struct address_space *mapping;
pgoff_t idx;
struct page *page;
mapping = vma->vm_file->f_mapping;
idx = vma_hugecache_offset(h, vma, address);
page = find_get_page(mapping, idx);
if (page)
put_page(page);
return page != NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hugh Dickins | 75 | 100.00% | 2 | 100.00% |
| Total | 75 | 100.00% | 2 | 100.00% |
int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
pgoff_t idx)
{
struct inode *inode = mapping->host;
struct hstate *h = hstate_inode(inode);
int err = add_to_page_cache(page, mapping, idx, GFP_KERNEL);
if (err)
return err;
ClearPagePrivate(page);
spin_lock(&inode->i_lock);
inode->i_blocks += blocks_per_huge_page(h);
spin_unlock(&inode->i_lock);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 91 | 100.00% | 1 | 100.00% |
| Total | 91 | 100.00% | 1 | 100.00% |
static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct address_space *mapping, pgoff_t idx,
unsigned long address, pte_t *ptep, unsigned int flags)
{
struct hstate *h = hstate_vma(vma);
int ret = VM_FAULT_SIGBUS;
int anon_rmap = 0;
unsigned long size;
struct page *page;
pte_t new_pte;
spinlock_t *ptl;
/*
* Currently, we are forced to kill the process in the event the
* original mapper has unmapped pages from the child due to a failed
* COW. Warn that such a situation has occurred as it may not be obvious
*/
if (is_vma_resv_set(vma, HPAGE_RESV_UNMAPPED)) {
pr_warn_ratelimited("PID %d killed due to inadequate hugepage pool\n",
current->pid);
return ret;
}
/*
* Use page lock to guard against racing truncation
* before we get page_table_lock.
*/
retry:
page = find_lock_page(mapping, idx);
if (!page) {
size = i_size_read(mapping->host) >> huge_page_shift(h);
if (idx >= size)
goto out;
/*
* Check for page in userfault range
*/
if (userfaultfd_missing(vma)) {
u32 hash;
struct vm_fault vmf = {
.vma = vma,
.address = address,
.flags = flags,
/*
* Hard to debug if it ends up being
* used by a callee that assumes
* something about the other
* uninitialized fields... same as in
* memory.c
*/
};
/*
* hugetlb_fault_mutex must be dropped before
* handling userfault. Reacquire after handling
* fault to make calling code simpler.
*/
hash = hugetlb_fault_mutex_hash(h, mm, vma, mapping,
idx, address);
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
ret = handle_userfault(&vmf, VM_UFFD_MISSING);
mutex_lock(&hugetlb_fault_mutex_table[hash]);
goto out;
}
page = alloc_huge_page(vma, address, 0);
if (IS_ERR(page)) {
ret = PTR_ERR(page);
if (ret == -ENOMEM)
ret = VM_FAULT_OOM;
else
ret = VM_FAULT_SIGBUS;
goto out;
}
clear_huge_page(page, address, pages_per_huge_page(h));
__SetPageUptodate(page);
set_page_huge_active(page);
if (vma->vm_flags & VM_MAYSHARE) {
int err = huge_add_to_page_cache(page, mapping, idx);
if (err) {
put_page(page);
if (err == -EEXIST)
goto retry;
goto out;
}
} else {
lock_page(page);
if (unlikely(anon_vma_prepare(vma))) {
ret = VM_FAULT_OOM;
goto backout_unlocked;
}
anon_rmap = 1;
}
} else {
/*
* If memory error occurs between mmap() and fault, some process
* don't have hwpoisoned swap entry for errored virtual address.
* So we need to block hugepage fault by PG_hwpoison bit check.
*/
if (unlikely(PageHWPoison(page))) {
ret = VM_FAULT_HWPOISON |
VM_FAULT_SET_HINDEX(hstate_index(h));
goto backout_unlocked;
}
}
/*
* If we are going to COW a private mapping later, we examine the
* pending reservations for this page now. This will ensure that
* any allocations necessary to record that reservation occur outside
* the spinlock.
*/
if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) {
if (vma_needs_reservation(h, vma, address) < 0) {
ret = VM_FAULT_OOM;
goto backout_unlocked;
}
/* Just decrements count, does not deallocate */
vma_end_reservation(h, vma, address);
}
ptl = huge_pte_lock(h, mm, ptep);
size = i_size_read(mapping->host) >> huge_page_shift(h);
if (idx >= size)
goto backout;
ret = 0;
if (!huge_pte_none(huge_ptep_get(ptep)))
goto backout;
if (anon_rmap) {
ClearPagePrivate(page);
hugepage_add_new_anon_rmap(page, vma, address);
} else
page_dup_rmap(page, true);
new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE)
&& (vma->vm_flags & VM_SHARED)));
set_huge_pte_at(mm, address, ptep, new_pte);
hugetlb_count_add(pages_per_huge_page(h), mm);
if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) {
/* Optimization, do the COW without a second fault */
ret = hugetlb_cow(mm, vma, address, ptep, page, ptl);
}
spin_unlock(ptl);
unlock_page(page);
out:
return ret;
backout:
spin_unlock(ptl);
backout_unlocked:
unlock_page(page);
restore_reserve_on_error(h, vma, address, page);
put_page(page);
goto out;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 251 | 37.80% | 3 | 7.50% |
| Mike Kravetz | 110 | 16.57% | 5 | 12.50% |
| Naoya Horiguchi | 53 | 7.98% | 5 | 12.50% |
| David Gibson | 42 | 6.33% | 3 | 7.50% |
| Adam Litke | 36 | 5.42% | 2 | 5.00% |
| Andi Kleen | 27 | 4.07% | 2 | 5.00% |
| Hillf Danton | 27 | 4.07% | 1 | 2.50% |
| Hugh Dickins | 25 | 3.77% | 2 | 5.00% |
| Mel Gorman | 25 | 3.77% | 3 | 7.50% |
| Aneesh Kumar K.V | 20 | 3.01% | 3 | 7.50% |
| Kirill A. Shutemov | 18 | 2.71% | 2 | 5.00% |
| Kenneth W. Chen | 8 | 1.20% | 2 | 5.00% |
| Davidlohr Bueso A | 8 | 1.20% | 1 | 2.50% |
| JoonSoo Kim | 7 | 1.05% | 1 | 2.50% |
| Gerald Schaefer | 3 | 0.45% | 1 | 2.50% |
| Geoffrey Thomas | 1 | 0.15% | 1 | 2.50% |
| Lucas De Marchi | 1 | 0.15% | 1 | 2.50% |
| Andrea Arcangeli | 1 | 0.15% | 1 | 2.50% |
| Andrew Morton | 1 | 0.15% | 1 | 2.50% |
| Total | 664 | 100.00% | 40 | 100.00% |
#ifdef CONFIG_SMP
u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
struct vm_area_struct *vma,
struct address_space *mapping,
pgoff_t idx, unsigned long address)
{
unsigned long key[2];
u32 hash;
if (vma->vm_flags & VM_SHARED) {
key[0] = (unsigned long) mapping;
key[1] = idx;
} else {
key[0] = (unsigned long) mm;
key[1] = address >> huge_page_shift(h);
}
hash = jhash2((u32 *)&key, sizeof(key)/sizeof(u32), 0);
return hash & (num_fault_mutexes - 1);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Davidlohr Bueso A | 128 | 99.22% | 1 | 50.00% |
| Mike Kravetz | 1 | 0.78% | 1 | 50.00% |
| Total | 129 | 100.00% | 2 | 100.00% |
#else
/*
* For uniprocesor systems we always use a single mutex, so just
* return 0 and avoid the hashing overhead.
*/
u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
struct vm_area_struct *vma,
struct address_space *mapping,
pgoff_t idx, unsigned long address)
{
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Davidlohr Bueso A | 34 | 97.14% | 1 | 50.00% |
| Mike Kravetz | 1 | 2.86% | 1 | 50.00% |
| Total | 35 | 100.00% | 2 | 100.00% |
#endif
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, unsigned int flags)
{
pte_t *ptep, entry;
spinlock_t *ptl;
int ret;
u32 hash;
pgoff_t idx;
struct page *page = NULL;
struct page *pagecache_page = NULL;
struct hstate *h = hstate_vma(vma);
struct address_space *mapping;
int need_wait_lock = 0;
address &= huge_page_mask(h);
ptep = huge_pte_offset(mm, address);
if (ptep) {
entry = huge_ptep_get(ptep);
if (unlikely(is_hugetlb_entry_migration(entry))) {
migration_entry_wait_huge(vma, mm, ptep);
return 0;
} else if (unlikely(is_hugetlb_entry_hwpoisoned(entry)))
return VM_FAULT_HWPOISON_LARGE |
VM_FAULT_SET_HINDEX(hstate_index(h));
} else {
ptep = huge_pte_alloc(mm, address, huge_page_size(h));
if (!ptep)
return VM_FAULT_OOM;
}
mapping = vma->vm_file->f_mapping;
idx = vma_hugecache_offset(h, vma, address);
/*
* Serialize hugepage allocation and instantiation, so that we don't
* get spurious allocation failures if two CPUs race to instantiate
* the same page in the page cache.
*/
hash = hugetlb_fault_mutex_hash(h, mm, vma, mapping, idx, address);
mutex_lock(&hugetlb_fault_mutex_table[hash]);
entry = huge_ptep_get(ptep);
if (huge_pte_none(entry)) {
ret = hugetlb_no_page(mm, vma, mapping, idx, address, ptep, flags);
goto out_mutex;
}
ret = 0;
/*
* entry could be a migration/hwpoison entry at this point, so this
* check prevents the kernel from going below assuming that we have
* a active hugepage in pagecache. This goto expects the 2nd page fault,
* and is_hugetlb_entry_(migration|hwpoisoned) check will properly
* handle it.
*/
if (!pte_present(entry))
goto out_mutex;
/*
* If we are going to COW the mapping later, we examine the pending
* reservations for this page now. This will ensure that any
* allocations necessary to record that reservation occur outside the
* spinlock. For private mappings, we also lookup the pagecache
* page now as it is used to determine if a reservation has been
* consumed.
*/
if ((flags & FAULT_FLAG_WRITE) && !huge_pte_write(entry)) {
if (vma_needs_reservation(h, vma, address) < 0) {
ret = VM_FAULT_OOM;
goto out_mutex;
}
/* Just decrements count, does not deallocate */
vma_end_reservation(h, vma, address);
if (!(vma->vm_flags & VM_MAYSHARE))
pagecache_page = hugetlbfs_pagecache_page(h,
vma, address);
}
ptl = huge_pte_lock(h, mm, ptep);
/* Check for a racing update before calling hugetlb_cow */
if (unlikely(!pte_same(entry, huge_ptep_get(ptep))))
goto out_ptl;
/*
* hugetlb_cow() requires page locks of pte_page(entry) and
* pagecache_page, so here we need take the former one
* when page != pagecache_page or !pagecache_page.
*/
page = pte_page(entry);
if (page != pagecache_page)
if (!trylock_page(page)) {
need_wait_lock = 1;
goto out_ptl;
}
get_page(page);
if (flags & FAULT_FLAG_WRITE) {
if (!huge_pte_write(entry)) {
ret = hugetlb_cow(mm, vma, address, ptep,
pagecache_page, ptl);
goto out_put_page;
}
entry = huge_pte_mkdirty(entry);
}
entry = pte_mkyoung(entry);
if (huge_ptep_set_access_flags(vma, address, ptep, entry,
flags & FAULT_FLAG_WRITE))
update_mmu_cache(vma, address, ptep);
out_put_page:
if (page != pagecache_page)
unlock_page(page);
put_page(page);
out_ptl:
spin_unlock(ptl);
if (pagecache_page) {
unlock_page(pagecache_page);
put_page(pagecache_page);
}
out_mutex:
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
/*
* Generally it's safe to hold refcount during waiting page lock. But
* here we just wait to defer the next page fault to avoid busy loop and
* the page is not used after unlocked before returning from the current
* page fault. So we are safe from accessing freed page, even if we wait
* here without taking refcount.
*/
if (need_wait_lock)
wait_on_page_locked(page);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 152 | 27.29% | 6 | 20.69% |
| Andy Whitcroft | 132 | 23.70% | 3 | 10.34% |
| Davidlohr Bueso A | 57 | 10.23% | 1 | 3.45% |
| David Gibson | 52 | 9.34% | 1 | 3.45% |
| Yanmin Zhang | 43 | 7.72% | 1 | 3.45% |
| Kenneth W. Chen | 30 | 5.39% | 2 | 6.90% |
| Andi Kleen | 21 | 3.77% | 2 | 6.90% |
| Kirill A. Shutemov | 17 | 3.05% | 1 | 3.45% |
| Hugh Dickins | 14 | 2.51% | 1 | 3.45% |
| Mike Kravetz | 13 | 2.33% | 3 | 10.34% |
| Kamezawa Hiroyuki | 7 | 1.26% | 1 | 3.45% |
| Gerald Schaefer | 6 | 1.08% | 2 | 6.90% |
| Chris Metcalf | 4 | 0.72% | 1 | 3.45% |
| Dean Nelson | 4 | 0.72% | 1 | 3.45% |
| Aneesh Kumar K.V | 3 | 0.54% | 1 | 3.45% |
| Mel Gorman | 1 | 0.18% | 1 | 3.45% |
| Russell King | 1 | 0.18% | 1 | 3.45% |
| Total | 557 | 100.00% | 29 | 100.00% |
/*
* Used by userfaultfd UFFDIO_COPY. Based on mcopy_atomic_pte with
* modifications for huge pages.
*/
int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
pte_t *dst_pte,
struct vm_area_struct *dst_vma,
unsigned long dst_addr,
unsigned long src_addr,
struct page **pagep)
{
int vm_shared = dst_vma->vm_flags & VM_SHARED;
struct hstate *h = hstate_vma(dst_vma);
pte_t _dst_pte;
spinlock_t *ptl;
int ret;
struct page *page;
if (!*pagep) {
ret = -ENOMEM;
page = alloc_huge_page(dst_vma, dst_addr, 0);
if (IS_ERR(page))
goto out;
ret = copy_huge_page_from_user(page,
(const void __user *) src_addr,
pages_per_huge_page(h), false);
/* fallback to copy_from_user outside mmap_sem */
if (unlikely(ret)) {
ret = -EFAULT;
*pagep = page;
/* don't free the page */
goto out;
}
} else {
page = *pagep;
*pagep = NULL;
}
/*
* The memory barrier inside __SetPageUptodate makes sure that
* preceding stores to the page contents become visible before
* the set_pte_at() write.
*/
__SetPageUptodate(page);
set_page_huge_active(page);
/*
* If shared, add to page cache
*/
if (vm_shared) {
struct address_space *mapping = dst_vma->vm_file->f_mapping;
pgoff_t idx = vma_hugecache_offset(h, dst_vma, dst_addr);
ret = huge_add_to_page_cache(page, mapping, idx);
if (ret)
goto out_release_nounlock;
}
ptl = huge_pte_lockptr(h, dst_mm, dst_pte);
spin_lock(ptl);
ret = -EEXIST;
if (!huge_pte_none(huge_ptep_get(dst_pte)))
goto out_release_unlock;
if (vm_shared) {
page_dup_rmap(page, true);
} else {
ClearPagePrivate(page);
hugepage_add_new_anon_rmap(page, dst_vma, dst_addr);
}
_dst_pte = make_huge_pte(dst_vma, page, dst_vma->vm_flags & VM_WRITE);
if (dst_vma->vm_flags & VM_WRITE)
_dst_pte = huge_pte_mkdirty(_dst_pte);
_dst_pte = pte_mkyoung(_dst_pte);
set_huge_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);
(void)huge_ptep_set_access_flags(dst_vma, dst_addr, dst_pte, _dst_pte,
dst_vma->vm_flags & VM_WRITE);
hugetlb_count_add(pages_per_huge_page(h), dst_mm);
/* No need to invalidate - it was non-present before */
update_mmu_cache(dst_vma, dst_addr, dst_pte);
spin_unlock(ptl);
if (vm_shared)
unlock_page(page);
ret = 0;
out:
return ret;
out_release_unlock:
spin_unlock(ptl);
out_release_nounlock:
if (vm_shared)
unlock_page(page);
put_page(page);
goto out;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 421 | 100.00% | 3 | 100.00% |
| Total | 421 | 100.00% | 3 | 100.00% |
long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct page **pages, struct vm_area_struct **vmas,
unsigned long *position, unsigned long *nr_pages,
long i, unsigned int flags, int *nonblocking)
{
unsigned long pfn_offset;
unsigned long vaddr = *position;
unsigned long remainder = *nr_pages;
struct hstate *h = hstate_vma(vma);
while (vaddr < vma->vm_end && remainder) {
pte_t *pte;
spinlock_t *ptl = NULL;
int absent;
struct page *page;
/*
* If we have a pending SIGKILL, don't keep faulting pages and
* potentially allocating memory.
*/
if (unlikely(fatal_signal_pending(current))) {
remainder = 0;
break;
}
/*
* Some archs (sparc64, sh*) have multiple pte_ts to
* each hugepage. We have to make sure we get the
* first, for the page indexing below to work.
*
* Note that page table lock is not held when pte is null.
*/
pte = huge_pte_offset(mm, vaddr & huge_page_mask(h));
if (pte)
ptl = huge_pte_lock(h, mm, pte);
absent = !pte || huge_pte_none(huge_ptep_get(pte));
/*
* When coredumping, it suits get_dump_page if we just return
* an error where there's an empty slot with no huge pagecache
* to back it. This way, we avoid allocating a hugepage, and
* the sparse dumpfile avoids allocating disk blocks, but its
* huge holes still show up with zeroes where they need to be.
*/
if (absent && (flags & FOLL_DUMP) &&
!hugetlbfs_pagecache_present(h, vma, vaddr)) {
if (pte)
spin_unlock(ptl);
remainder = 0;
break;
}
/*
* We need call hugetlb_fault for both hugepages under migration
* (in which case hugetlb_fault waits for the migration,) and
* hwpoisoned hugepages (in which case we need to prevent the
* caller from accessing to them.) In order to do this, we use
* here is_swap_pte instead of is_hugetlb_entry_migration and
* is_hugetlb_entry_hwpoisoned. This is because it simply covers
* both cases, and because we can't follow correct pages
* directly from any kind of swap entries.
*/
if (absent || is_swap_pte(huge_ptep_get(pte)) ||
((flags & FOLL_WRITE) &&
!huge_pte_write(huge_ptep_get(pte)))) {
int ret;
unsigned int fault_flags = 0;
if (pte)
spin_unlock(ptl);
if (flags & FOLL_WRITE)
fault_flags |= FAULT_FLAG_WRITE;
if (nonblocking)
fault_flags |= FAULT_FLAG_ALLOW_RETRY;
if (flags & FOLL_NOWAIT)
fault_flags |= FAULT_FLAG_ALLOW_RETRY |
FAULT_FLAG_RETRY_NOWAIT;
if (flags & FOLL_TRIED) {
VM_WARN_ON_ONCE(fault_flags &
FAULT_FLAG_ALLOW_RETRY);
fault_flags |= FAULT_FLAG_TRIED;
}
ret = hugetlb_fault(mm, vma, vaddr, fault_flags);
if (ret & VM_FAULT_ERROR) {
remainder = 0;
break;
}
if (ret & VM_FAULT_RETRY) {
if (nonblocking)
*nonblocking = 0;
*nr_pages = 0;
/*
* VM_FAULT_RETRY must not return an
* error, it will return zero
* instead.
*
* No need to update "position" as the
* caller will not check it after
* *nr_pages is set to 0.
*/
return i;
}
continue;
}
pfn_offset = (vaddr & ~huge_page_mask(h)) >> PAGE_SHIFT;
page = pte_page(huge_ptep_get(pte));
same_page:
if (pages) {
pages[i] = mem_map_offset(page, pfn_offset);
get_page(pages[i]);
}
if (vmas)
vmas[i] = vma;
vaddr += PAGE_SIZE;
++pfn_offset;
--remainder;
++i;
if (vaddr < vma->vm_end && remainder &&
pfn_offset < pages_per_huge_page(h)) {
/*
* We use pfn_offset to avoid touching the pageframes
* of this compound page.
*/
goto same_page;
}
spin_unlock(ptl);
}
*nr_pages = remainder;
/*
* setting position is actually required only if remainder is
* not zero but it's faster not to add a "if (remainder)"
* branch.
*/
*position = vaddr;
return i ? i : -EFAULT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 184 | 38.41% | 2 | 13.33% |
| Andrea Arcangeli | 90 | 18.79% | 1 | 6.67% |
| Kenneth W. Chen | 50 | 10.44% | 1 | 6.67% |
| Hugh Dickins | 46 | 9.60% | 2 | 13.33% |
| Kirill A. Shutemov | 39 | 8.14% | 2 | 13.33% |
| Andi Kleen | 22 | 4.59% | 1 | 6.67% |
| David Rientjes | 18 | 3.76% | 1 | 6.67% |
| Motohiro Kosaki | 10 | 2.09% | 1 | 6.67% |
| Michel Lespinasse | 9 | 1.88% | 1 | 6.67% |
| Naoya Horiguchi | 9 | 1.88% | 1 | 6.67% |
| Gerald Schaefer | 1 | 0.21% | 1 | 6.67% |
| Stephen Hemminger | 1 | 0.21% | 1 | 6.67% |
| Total | 479 | 100.00% | 15 | 100.00% |
#ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
/*
* ARCHes with special requirements for evicting HUGETLB backing TLB entries can
* implement this.
*/
#define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
#endif
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
unsigned long address, unsigned long end, pgprot_t newprot)
{
struct mm_struct *mm = vma->vm_mm;
unsigned long start = address;
pte_t *ptep;
pte_t pte;
struct hstate *h = hstate_vma(vma);
unsigned long pages = 0;
BUG_ON(address >= end);
flush_cache_range(vma, address, end);
mmu_notifier_invalidate_range_start(mm, start, end);
i_mmap_lock_write(vma->vm_file->f_mapping);
for (; address < end; address += huge_page_size(h)) {
spinlock_t *ptl;
ptep = huge_pte_offset(mm, address);
if (!ptep)
continue;
ptl = huge_pte_lock(h, mm, ptep);
if (huge_pmd_unshare(mm, &address, ptep)) {
pages++;
spin_unlock(ptl);
continue;
}
pte = huge_ptep_get(ptep);
if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) {
spin_unlock(ptl);
continue;
}
if (unlikely(is_hugetlb_entry_migration(pte))) {
swp_entry_t entry = pte_to_swp_entry(pte);
if (is_write_migration_entry(entry)) {
pte_t newpte;
make_migration_entry_read(&entry);
newpte = swp_entry_to_pte(entry);
set_huge_pte_at(mm, address, ptep, newpte);
pages++;
}
spin_unlock(ptl);
continue;
}
if (!huge_pte_none(pte)) {
pte = huge_ptep_get_and_clear(mm, address, ptep);
pte = pte_mkhuge(huge_pte_modify(pte, newprot));
pte = arch_make_huge_pte(pte, vma, NULL, 0);
set_huge_pte_at(mm, address, ptep, pte);
pages++;
}
spin_unlock(ptl);
}
/*
* Must flush TLB before releasing i_mmap_rwsem: x86's huge_pmd_unshare
* may have cleared our pud entry and done put_page on the page table:
* once we release i_mmap_rwsem, another task can do the final put_page
* and that page table be reused and filled with junk.
*/
flush_hugetlb_tlb_range(vma, start, end);
mmu_notifier_invalidate_range(mm, start, end);
i_mmap_unlock_write(vma->vm_file->f_mapping);
mmu_notifier_invalidate_range_end(mm, start, end);
return pages << h->order;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 112 | 30.94% | 1 | 7.14% |
| Naoya Horiguchi | 90 | 24.86% | 1 | 7.14% |
| Kenneth W. Chen | 48 | 13.26% | 1 | 7.14% |
| Peter Zijlstra | 23 | 6.35% | 1 | 7.14% |
| Kirill A. Shutemov | 22 | 6.08% | 1 | 7.14% |
| Rik Van Riel | 18 | 4.97% | 1 | 7.14% |
| Andi Kleen | 14 | 3.87% | 1 | 7.14% |
| Tony Lu | 13 | 3.59% | 1 | 7.14% |
| Joerg Roedel | 9 | 2.49% | 1 | 7.14% |
| Mel Gorman | 8 | 2.21% | 1 | 7.14% |
| Davidlohr Bueso A | 3 | 0.83% | 2 | 14.29% |
| Aneesh Kumar K.V | 1 | 0.28% | 1 | 7.14% |
| Gerald Schaefer | 1 | 0.28% | 1 | 7.14% |
| Total | 362 | 100.00% | 14 | 100.00% |
int hugetlb_reserve_pages(struct inode *inode,
long from, long to,
struct vm_area_struct *vma,
vm_flags_t vm_flags)
{
long ret, chg;
struct hstate *h = hstate_inode(inode);
struct hugepage_subpool *spool = subpool_inode(inode);
struct resv_map *resv_map;
long gbl_reserve;
/*
* Only apply hugepage reservation if asked. At fault time, an
* attempt will be made for VM_NORESERVE to allocate a page
* without using reserves
*/
if (vm_flags & VM_NORESERVE)
return 0;
/*
* Shared mappings base their reservation on the number of pages that
* are already allocated on behalf of the file. Private mappings need
* to reserve the full area even if read-only as mprotect() may be
* called to make the mapping read-write. Assume !vma is a shm mapping
*/
if (!vma || vma->vm_flags & VM_MAYSHARE) {
resv_map = inode_resv_map(inode);
chg = region_chg(resv_map, from, to);
} else {
resv_map = resv_map_alloc();
if (!resv_map)
return -ENOMEM;
chg = to - from;
set_vma_resv_map(vma, resv_map);
set_vma_resv_flags(vma, HPAGE_RESV_OWNER);
}
if (chg < 0) {
ret = chg;
goto out_err;
}
/*
* There must be enough pages in the subpool for the mapping. If
* the subpool has a minimum size, there may be some global
* reservations already in place (gbl_reserve).
*/
gbl_reserve = hugepage_subpool_get_pages(spool, chg);
if (gbl_reserve < 0) {
ret = -ENOSPC;
goto out_err;
}
/*
* Check enough hugepages are available for the reservation.
* Hand the pages back to the subpool if there are not
*/
ret = hugetlb_acct_memory(h, gbl_reserve);
if (ret < 0) {
/* put back original number of pages, chg */
(void)hugepage_subpool_put_pages(spool, chg);
goto out_err;
}
/*
* Account for the reservations made. Shared mappings record regions
* that have reservations as they are shared by multiple VMAs.
* When the last VMA disappears, the region map says how much
* the reservation was and the page cache tells how much of
* the reservation was consumed. Private mappings are per-VMA and
* only the consumed reservations are tracked. When the VMA
* disappears, the original reservation is the VMA size and the
* consumed reservations are stored in the map. Hence, nothing
* else has to be done for private mappings here
*/
if (!vma || vma->vm_flags & VM_MAYSHARE) {
long add = region_add(resv_map, from, to);
if (unlikely(chg > add)) {
/*
* pages in this range were added to the reserve
* map between region_chg and region_add. This
* indicates a race with alloc_huge_page. Adjust
* the subpool and reserve counts modified above
* based on the difference.
*/
long rsv_adjust;
rsv_adjust = hugepage_subpool_put_pages(spool,
chg - add);
hugetlb_acct_memory(h, -rsv_adjust);
}
}
return 0;
out_err:
if (!vma || vma->vm_flags & VM_MAYSHARE)
/* Don't call region_abort if region_chg failed */
if (chg >= 0)
region_abort(resv_map, from, to);
if (vma && is_vma_resv_set(vma, HPAGE_RESV_OWNER))
kref_put(&resv_map->refs, resv_map_release);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 83 | 25.54% | 4 | 21.05% |
| Mel Gorman | 73 | 22.46% | 4 | 21.05% |
| Kenneth W. Chen | 61 | 18.77% | 1 | 5.26% |
| JoonSoo Kim | 32 | 9.85% | 3 | 15.79% |
| Dave Hansen | 31 | 9.54% | 2 | 10.53% |
| David Gibson | 16 | 4.92% | 1 | 5.26% |
| Andi Kleen | 12 | 3.69% | 1 | 5.26% |
| Adam Litke | 7 | 2.15% | 1 | 5.26% |
| Ken Chen | 7 | 2.15% | 1 | 5.26% |
| Motohiro Kosaki | 3 | 0.92% | 1 | 5.26% |
| Total | 325 | 100.00% | 19 | 100.00% |
long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
long freed)
{
struct hstate *h = hstate_inode(inode);
struct resv_map *resv_map = inode_resv_map(inode);
long chg = 0;
struct hugepage_subpool *spool = subpool_inode(inode);
long gbl_reserve;
if (resv_map) {
chg = region_del(resv_map, start, end);
/*
* region_del() can fail in the rare case where a region
* must be split and another region descriptor can not be
* allocated. If end == LONG_MAX, it will not fail.
*/
if (chg < 0)
return chg;
}
spin_lock(&inode->i_lock);
inode->i_blocks -= (blocks_per_huge_page(h) * freed);
spin_unlock(&inode->i_lock);
/*
* If the subpool has a minimum size, the number of global
* reservations to be released may be adjusted.
*/
gbl_reserve = hugepage_subpool_put_pages(spool, (chg - freed));
hugetlb_acct_memory(h, -gbl_reserve);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Kravetz | 31 | 22.46% | 3 | 27.27% |
| JoonSoo Kim | 23 | 16.67% | 2 | 18.18% |
| Kenneth W. Chen | 22 | 15.94% | 1 | 9.09% |
| Ken Chen | 21 | 15.22% | 1 | 9.09% |
| Andi Kleen | 16 | 11.59% | 1 | 9.09% |
| David Gibson | 12 | 8.70% | 1 | 9.09% |
| Adam Litke | 9 | 6.52% | 1 | 9.09% |
| Eric Sandeen | 4 | 2.90% | 1 | 9.09% |
| Total | 138 | 100.00% | 11 | 100.00% |
#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
static unsigned long page_table_shareable(struct vm_area_struct *svma,
struct vm_area_struct *vma,
unsigned long addr, pgoff_t idx)
{
unsigned long saddr = ((idx - svma->vm_pgoff) << PAGE_SHIFT) +
svma->vm_start;
unsigned long sbase = saddr & PUD_MASK;
unsigned long s_end = sbase + PUD_SIZE;
/* Allow segments to share if only one is marked locked */
unsigned long vm_flags = vma->vm_flags & VM_LOCKED_CLEAR_MASK;
unsigned long svm_flags = svma->vm_flags & VM_LOCKED_CLEAR_MASK;
/*
* match the virtual addresses, permission and the alignment of the
* page table page.
*/
if (pmd_index(addr) != pmd_index(saddr) ||
vm_flags != svm_flags ||
sbase < svma->vm_start || svma->vm_end < s_end)
return 0;
return saddr;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve Capper | 114 | 98.28% | 1 | 50.00% |
| Eric B Munson | 2 | 1.72% | 1 | 50.00% |
| Total | 116 | 100.00% | 2 | 100.00% |
static bool vma_shareable(struct vm_area_struct *vma, unsigned long addr)
{
unsigned long base = addr & PUD_MASK;
unsigned long end = base + PUD_SIZE;
/*
* check on proper vm_flags and page table alignment
*/
if (vma->vm_flags & VM_MAYSHARE &&
vma->vm_start <= base && end <= vma->vm_end)
return true;
return false;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve Capper | 55 | 94.83% | 1 | 50.00% |
| Nicholas Krause | 3 | 5.17% | 1 | 50.00% |
| Total | 58 | 100.00% | 2 | 100.00% |
/*
* Search for a shareable pmd page for hugetlb. In any case calls pmd_alloc()
* and returns the corresponding pte. While this is not necessary for the
* !shared pmd case because we can allocate the pmd later as well, it makes the
* code much cleaner. pmd allocation is essential for the shared case because
* pud has to be populated inside the same i_mmap_rwsem section - otherwise
* racing tasks could either miss the sharing (see huge_pte_offset) or select a
* bad pmd for sharing.
*/
pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
{
struct vm_area_struct *vma = find_vma(mm, addr);
struct address_space *mapping = vma->vm_file->f_mapping;
pgoff_t idx = ((addr - vma->vm_start) >> PAGE_SHIFT) +
vma->vm_pgoff;
struct vm_area_struct *svma;
unsigned long saddr;
pte_t *spte = NULL;
pte_t *pte;
spinlock_t *ptl;
if (!vma_shareable(vma, addr))
return (pte_t *)pmd_alloc(mm, pud, addr);
i_mmap_lock_write(mapping);
vma_interval_tree_foreach(svma, &mapping->i_mmap, idx, idx) {
if (svma == vma)
continue;
saddr = page_table_shareable(svma, vma, addr, idx);
if (saddr) {
spte = huge_pte_offset(svma->vm_mm, saddr);
if (spte) {
get_page(virt_to_page(spte));
break;
}
}
}
if (!spte)
goto out;
ptl = huge_pte_lock(hstate_vma(vma), mm, spte);
if (pud_none(*pud)) {
pud_populate(mm, pud,
(pmd_t *)((unsigned long)spte & PAGE_MASK));
mm_inc_nr_pmds(mm);
} else {
put_page(virt_to_page(spte));
}
spin_unlock(ptl);
out:
pte = (pte_t *)pmd_alloc(mm, pud, addr);
i_mmap_unlock_write(mapping);
return pte;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve Capper | 248 | 89.86% | 1 | 16.67% |
| Kirill A. Shutemov | 25 | 9.06% | 3 | 50.00% |
| Davidlohr Bueso A | 2 | 0.72% | 1 | 16.67% |
| Aneesh Kumar K.V | 1 | 0.36% | 1 | 16.67% |
| Total | 276 | 100.00% | 6 | 100.00% |
/*
* unmap huge page backed by shared pte.
*
* Hugetlb pte page is ref counted at the time of mapping. If pte is shared
* indicated by page_count > 1, unmap is achieved by clearing pud and
* decrementing the ref count. If count == 1, the pte page is not shared.
*
* called with page table lock held.
*
* returns: 1 successfully unmapped a shared pte page
* 0 the underlying pte page is not shared, or it is the last user
*/
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
{
pgd_t *pgd = pgd_offset(mm, *addr);
p4d_t *p4d = p4d_offset(pgd, *addr);
pud_t *pud = pud_offset(p4d, *addr);
BUG_ON(page_count(virt_to_page(ptep)) == 0);
if (page_count(virt_to_page(ptep)) == 1)
return 0;
pud_clear(pud);
put_page(virt_to_page(ptep));
mm_dec_nr_pmds(mm);
*addr = ALIGN(*addr, HPAGE_SIZE * PTRS_PER_PTE) - HPAGE_SIZE;
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve Capper | 101 | 84.87% | 1 | 33.33% |
| Kirill A. Shutemov | 18 | 15.13% | 2 | 66.67% |
| Total | 119 | 100.00% | 3 | 100.00% |
#define want_pmd_share() (1)
#else /* !CONFIG_ARCH_WANT_HUGE_PMD_SHARE */
pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
{
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve Capper | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
{
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Zhang Zhen | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
#define want_pmd_share() (0)
#endif /* CONFIG_ARCH_WANT_HUGE_PMD_SHARE */
#ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB
pte_t *huge_pte_alloc(struct mm_struct *mm,
unsigned long addr, unsigned long sz)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pte_t *pte = NULL;
pgd = pgd_offset(mm, addr);
p4d = p4d_offset(pgd, addr);
pud = pud_alloc(mm, p4d, addr);
if (pud) {
if (sz == PUD_SIZE) {
pte = (pte_t *)pud;
} else {
BUG_ON(sz != PMD_SIZE);
if (want_pmd_share() && pud_none(*pud))
pte = huge_pmd_share(mm, addr, pud);
else
pte = (pte_t *)pmd_alloc(mm, pud, addr);
}
}
BUG_ON(pte && pte_present(*pte) && !pte_huge(*pte));
return pte;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve Capper | 142 | 90.45% | 1 | 33.33% |
| Kirill A. Shutemov | 14 | 8.92% | 1 | 33.33% |
| Michal Hocko | 1 | 0.64% | 1 | 33.33% |
| Total | 157 | 100.00% | 3 | 100.00% |
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pgd = pgd_offset(mm, addr);
if (!pgd_present(*pgd))
return NULL;
p4d = p4d_offset(pgd, addr);
if (!p4d_present(*p4d))
return NULL;
pud = pud_offset(p4d, addr);
if (!pud_present(*pud))
return NULL;
if (pud_huge(*pud))
return (pte_t *)pud;
pmd = pmd_offset(pud, addr);
return (pte_t *) pmd;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve Capper | 91 | 72.80% | 1 | 50.00% |
| Kirill A. Shutemov | 34 | 27.20% | 1 | 50.00% |
| Total | 125 | 100.00% | 2 | 100.00% |
#endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
/*
* These functions are overwritable if your architecture needs its own
* behavior.
*/
struct page * __weak
follow_huge_addr(struct mm_struct *mm, unsigned long address,
int write)
{
return ERR_PTR(-EINVAL);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 27 | 100.00% | 1 | 100.00% |
| Total | 27 | 100.00% | 1 | 100.00% |
struct page * __weak
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int flags)
{
struct page *page = NULL;
spinlock_t *ptl;
pte_t pte;
retry:
ptl = pmd_lockptr(mm, pmd);
spin_lock(ptl);
/*
* make sure that the address range covered by this pmd is not
* unmapped from other threads.
*/
if (!pmd_huge(*pmd))
goto out;
pte = huge_ptep_get((pte_t *)pmd);
if (pte_present(pte)) {
page = pmd_page(*pmd) + ((address & ~PMD_MASK) >> PAGE_SHIFT);
if (flags & FOLL_GET)
get_page(page);
} else {
if (is_hugetlb_entry_migration(pte)) {
spin_unlock(ptl);
__migration_entry_wait(mm, (pte_t *)pmd, ptl);
goto retry;
}
/*
* hwpoisoned entry is treated as no_page_table in
* follow_page_mask().
*/
}
out:
spin_unlock(ptl);
return page;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 113 | 70.19% | 4 | 66.67% |
| Steve Capper | 47 | 29.19% | 1 | 16.67% |
| Gerald Schaefer | 1 | 0.62% | 1 | 16.67% |
| Total | 161 | 100.00% | 6 | 100.00% |
struct page * __weak
follow_huge_pud(struct mm_struct *mm, unsigned long address,
pud_t *pud, int flags)
{
if (flags & FOLL_GET)
return NULL;
return pte_page(*(pte_t *)pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Steve Capper | 42 | 76.36% | 1 | 33.33% |
| Naoya Horiguchi | 13 | 23.64% | 2 | 66.67% |
| Total | 55 | 100.00% | 3 | 100.00% |
#ifdef CONFIG_MEMORY_FAILURE
/*
* This function is called from memory failure code.
*/
int dequeue_hwpoisoned_huge_page(struct page *hpage)
{
struct hstate *h = page_hstate(hpage);
int nid = page_to_nid(hpage);
int ret = -EBUSY;
spin_lock(&hugetlb_lock);
/*
* Just checking !page_huge_active is not enough, because that could be
* an isolated/hwpoisoned hugepage (which have >0 refcount).
*/
if (!page_huge_active(hpage) && !page_count(hpage)) {
/*
* Hwpoisoned hugepage isn't linked to activelist or freelist,
* but dangling hpage->lru can trigger list-debug warnings
* (this happens when we call unpoison_memory() on it),
* so let it point to itself with list_del_init().
*/
list_del_init(&hpage->lru);
set_page_refcounted(hpage);
h->free_huge_pages--;
h->free_huge_pages_node[nid]--;
ret = 0;
}
spin_unlock(&hugetlb_lock);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 97 | 100.00% | 5 | 100.00% |
| Total | 97 | 100.00% | 5 | 100.00% |
#endif
bool isolate_huge_page(struct page *page, struct list_head *list)
{
bool ret = true;
VM_BUG_ON_PAGE(!PageHead(page), page);
spin_lock(&hugetlb_lock);
if (!page_huge_active(page) || !get_page_unless_zero(page)) {
ret = false;
goto unlock;
}
clear_page_huge_active(page);
list_move_tail(&page->lru, list);
unlock:
spin_unlock(&hugetlb_lock);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 83 | 96.51% | 2 | 66.67% |
| Sasha Levin | 3 | 3.49% | 1 | 33.33% |
| Total | 86 | 100.00% | 3 | 100.00% |
void putback_active_hugepage(struct page *page)
{
VM_BUG_ON_PAGE(!PageHead(page), page);
spin_lock(&hugetlb_lock);
set_page_huge_active(page);
list_move_tail(&page->lru, &(page_hstate(page))->hugepage_activelist);
spin_unlock(&hugetlb_lock);
put_page(page);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Naoya Horiguchi | 58 | 95.08% | 2 | 66.67% |
| Sasha Levin | 3 | 4.92% | 1 | 33.33% |
| Total | 61 | 100.00% | 3 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Whitcroft | 3205 | 17.60% | 8 | 2.20% |
| Mike Kravetz | 2300 | 12.63% | 24 | 6.61% |
| Naoya Horiguchi | 1613 | 8.86% | 39 | 10.74% |
| Lee Schermerhorn | 1208 | 6.63% | 7 | 1.93% |
| Andi Kleen | 1142 | 6.27% | 8 | 2.20% |
| Nishanth Aravamudan | 1066 | 5.85% | 9 | 2.48% |
| Luiz Fernando N. Capitulino | 972 | 5.34% | 5 | 1.38% |
| Steve Capper | 884 | 4.85% | 2 | 0.55% |
| David Gibson | 651 | 3.57% | 9 | 2.48% |
| Mel Gorman | 564 | 3.10% | 17 | 4.68% |
| Davidlohr Bueso A | 481 | 2.64% | 6 | 1.65% |
| JoonSoo Kim | 461 | 2.53% | 18 | 4.96% |
| Aneesh Kumar K.V | 354 | 1.94% | 18 | 4.96% |
| Dave Hansen | 321 | 1.76% | 4 | 1.10% |
| Kenneth W. Chen | 295 | 1.62% | 8 | 2.20% |
| Kirill A. Shutemov | 281 | 1.54% | 12 | 3.31% |
| Adam Litke | 260 | 1.43% | 16 | 4.41% |
| David Rientjes | 193 | 1.06% | 6 | 1.65% |
| Hugh Dickins | 177 | 0.97% | 8 | 2.20% |
| Fengguang Wu | 170 | 0.93% | 1 | 0.28% |
| Andrea Arcangeli | 160 | 0.88% | 5 | 1.38% |
| Gerald Schaefer | 140 | 0.77% | 9 | 2.48% |
| Andrew Morton | 120 | 0.66% | 8 | 2.20% |
| Hillf Danton | 110 | 0.60% | 7 | 1.93% |
| Zhang Yi | 86 | 0.47% | 1 | 0.28% |
| Nicholas Piggin | 71 | 0.39% | 4 | 1.10% |
| Sagi Grimberg | 65 | 0.36% | 1 | 0.28% |
| Andreas Sandberg | 62 | 0.34% | 1 | 0.28% |
| Vaishali Thakkar | 51 | 0.28% | 2 | 0.55% |
| Michal Hocko | 46 | 0.25% | 4 | 1.10% |
| Eric B Munson | 45 | 0.25% | 3 | 0.83% |
| Yanmin Zhang | 43 | 0.24% | 1 | 0.28% |
| Ken Chen | 41 | 0.23% | 4 | 1.10% |
| Jianyu Zhan | 41 | 0.23% | 1 | 0.28% |
| Becky Bruce | 40 | 0.22% | 1 | 0.28% |
| Christoph Lameter | 37 | 0.20% | 5 | 1.38% |
| Joerg Roedel | 34 | 0.19% | 2 | 0.55% |
| Sasha Levin | 33 | 0.18% | 2 | 0.55% |
| Rik Van Riel | 23 | 0.13% | 2 | 0.55% |
| Peter Zijlstra | 23 | 0.13% | 1 | 0.28% |
| Zhang Zhen | 22 | 0.12% | 1 | 0.28% |
| Chris Metcalf | 17 | 0.09% | 2 | 0.55% |
| Wanpeng Li | 17 | 0.09% | 2 | 0.55% |
| Miao Xie | 17 | 0.09% | 1 | 0.28% |
| Vlastimil Babka | 16 | 0.09% | 2 | 0.55% |
| Tony Lu | 13 | 0.07% | 1 | 0.28% |
| Motohiro Kosaki | 13 | 0.07% | 2 | 0.55% |
| Masayoshi Mizuma | 12 | 0.07% | 2 | 0.55% |
| Kay Sievers | 12 | 0.07% | 1 | 0.28% |
| Alexey Dobriyan | 11 | 0.06% | 2 | 0.55% |
| Rafael Aquini | 11 | 0.06% | 1 | 0.28% |
| Larry Woodman | 10 | 0.05% | 1 | 0.28% |
| Michel Lespinasse | 10 | 0.05% | 2 | 0.55% |
| Grygorii Strashko | 9 | 0.05% | 1 | 0.28% |
| Nicholas Krause | 9 | 0.05% | 2 | 0.55% |
| Youquan Song | 7 | 0.04% | 1 | 0.28% |
| Kamezawa Hiroyuki | 7 | 0.04% | 1 | 0.28% |
| Benjamin Herrenschmidt | 7 | 0.04% | 2 | 0.55% |
| Al Viro | 6 | 0.03% | 3 | 0.83% |
| Jon Tollefson | 6 | 0.03% | 1 | 0.28% |
| Lai Jiangshan | 6 | 0.03% | 1 | 0.28% |
| Dean Nelson | 6 | 0.03% | 2 | 0.55% |
| Li Zhong | 6 | 0.03% | 1 | 0.28% |
| Doug Doan | 6 | 0.03% | 1 | 0.28% |
| Jiang Liu | 5 | 0.03% | 1 | 0.28% |
| Will Deacon | 5 | 0.03% | 1 | 0.28% |
| Johannes Weiner | 5 | 0.03% | 1 | 0.28% |
| Dan J Williams | 5 | 0.03% | 1 | 0.28% |
| zhong jiang | 5 | 0.03% | 1 | 0.28% |
| Lucas De Marchi | 5 | 0.03% | 1 | 0.28% |
| Eric Sandeen | 4 | 0.02% | 1 | 0.28% |
| Jia He | 4 | 0.02% | 1 | 0.28% |
| Adrian Bunk | 3 | 0.02% | 2 | 0.55% |
| Jianguo Wu | 3 | 0.02% | 1 | 0.28% |
| Joe Perches | 3 | 0.02% | 1 | 0.28% |
| Gideon Israel Dsouza | 3 | 0.02% | 1 | 0.28% |
| Ingo Molnar | 3 | 0.02% | 1 | 0.28% |
| Linus Torvalds | 3 | 0.02% | 1 | 0.28% |
| Tejun Heo | 3 | 0.02% | 1 | 0.28% |
| Russell King | 2 | 0.01% | 1 | 0.28% |
| Claudiu Ghioc | 2 | 0.01% | 1 | 0.28% |
| Wang Sheng-Hui | 2 | 0.01% | 1 | 0.28% |
| Matthew Dobson | 2 | 0.01% | 1 | 0.28% |
| Jan Stancek | 2 | 0.01% | 1 | 0.28% |
| Roel Kluin | 2 | 0.01% | 1 | 0.28% |
| Lucas Stach | 2 | 0.01% | 1 | 0.28% |
| Konstantin Khlebnikov | 2 | 0.01% | 1 | 0.28% |
| Atsushi Nemoto | 1 | 0.01% | 1 | 0.28% |
| Vladimir Davydov | 1 | 0.01% | 1 | 0.28% |
| Stephen Hemminger | 1 | 0.01% | 1 | 0.28% |
| Chris Forbes | 1 | 0.01% | 1 | 0.28% |
| Cyrill V. Gorcunov | 1 | 0.01% | 1 | 0.28% |
| Geoffrey Thomas | 1 | 0.01% | 1 | 0.28% |
| Paul Gortmaker | 1 | 0.01% | 1 | 0.28% |
| Robert P. J. Day | 1 | 0.01% | 1 | 0.28% |
| Jingoo Han | 1 | 0.01% | 1 | 0.28% |
| Alexander Kuleshov | 1 | 0.01% | 1 | 0.28% |
| Andrey Ryabinin | 1 | 0.01% | 1 | 0.28% |
| Harvey Harrison | 1 | 0.01% | 1 | 0.28% |
| Nadia Yvette Chambers | 1 | 0.01% | 1 | 0.28% |
| Yisheng Xie | 1 | 0.01% | 1 | 0.28% |
| Total | 18214 | 100.00% | 363 | 100.00% |
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