Release 4.7 mm/rmap.c
/*
* mm/rmap.c - physical to virtual reverse mappings
*
* Copyright 2001, Rik van Riel <riel@conectiva.com.br>
* Released under the General Public License (GPL).
*
* Simple, low overhead reverse mapping scheme.
* Please try to keep this thing as modular as possible.
*
* Provides methods for unmapping each kind of mapped page:
* the anon methods track anonymous pages, and
* the file methods track pages belonging to an inode.
*
* Original design by Rik van Riel <riel@conectiva.com.br> 2001
* File methods by Dave McCracken <dmccr@us.ibm.com> 2003, 2004
* Anonymous methods by Andrea Arcangeli <andrea@suse.de> 2004
* Contributions by Hugh Dickins 2003, 2004
*/
/*
* Lock ordering in mm:
*
* inode->i_mutex (while writing or truncating, not reading or faulting)
* mm->mmap_sem
* page->flags PG_locked (lock_page)
* hugetlbfs_i_mmap_rwsem_key (in huge_pmd_share)
* mapping->i_mmap_rwsem
* anon_vma->rwsem
* mm->page_table_lock or pte_lock
* zone->lru_lock (in mark_page_accessed, isolate_lru_page)
* swap_lock (in swap_duplicate, swap_info_get)
* mmlist_lock (in mmput, drain_mmlist and others)
* mapping->private_lock (in __set_page_dirty_buffers)
* mem_cgroup_{begin,end}_page_stat (memcg->move_lock)
* mapping->tree_lock (widely used)
* inode->i_lock (in set_page_dirty's __mark_inode_dirty)
* bdi.wb->list_lock (in set_page_dirty's __mark_inode_dirty)
* sb_lock (within inode_lock in fs/fs-writeback.c)
* mapping->tree_lock (widely used, in set_page_dirty,
* in arch-dependent flush_dcache_mmap_lock,
* within bdi.wb->list_lock in __sync_single_inode)
*
* anon_vma->rwsem,mapping->i_mutex (memory_failure, collect_procs_anon)
* ->tasklist_lock
* pte map lock
*/
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/ksm.h>
#include <linux/rmap.h>
#include <linux/rcupdate.h>
#include <linux/export.h>
#include <linux/memcontrol.h>
#include <linux/mmu_notifier.h>
#include <linux/migrate.h>
#include <linux/hugetlb.h>
#include <linux/backing-dev.h>
#include <linux/page_idle.h>
#include <asm/tlbflush.h>
#include <trace/events/tlb.h>
#include "internal.h"
static struct kmem_cache *anon_vma_cachep;
static struct kmem_cache *anon_vma_chain_cachep;
static inline struct anon_vma *anon_vma_alloc(void)
{
struct anon_vma *anon_vma;
anon_vma = kmem_cache_alloc(anon_vma_cachep, GFP_KERNEL);
if (anon_vma) {
atomic_set(&anon_vma->refcount, 1);
anon_vma->degree = 1; /* Reference for first vma */
anon_vma->parent = anon_vma;
/*
* Initialise the anon_vma root to point to itself. If called
* from fork, the root will be reset to the parents anon_vma.
*/
anon_vma->root = anon_vma;
}
return anon_vma;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
peter zijlstra | peter zijlstra | 33 | 51.56% | 1 | 33.33% |
adrian bunk | adrian bunk | 18 | 28.12% | 1 | 33.33% |
konstantin khlebnikov | konstantin khlebnikov | 13 | 20.31% | 1 | 33.33% |
| Total | 64 | 100.00% | 3 | 100.00% |
static inline void anon_vma_free(struct anon_vma *anon_vma)
{
VM_BUG_ON(atomic_read(&anon_vma->refcount));
/*
* Synchronize against page_lock_anon_vma_read() such that
* we can safely hold the lock without the anon_vma getting
* freed.
*
* Relies on the full mb implied by the atomic_dec_and_test() from
* put_anon_vma() against the acquire barrier implied by
* down_read_trylock() from page_lock_anon_vma_read(). This orders:
*
* page_lock_anon_vma_read() VS put_anon_vma()
* down_read_trylock() atomic_dec_and_test()
* LOCK MB
* atomic_read() rwsem_is_locked()
*
* LOCK should suffice since the actual taking of the lock must
* happen _before_ what follows.
*/
might_sleep();
if (rwsem_is_locked(&anon_vma->root->rwsem)) {
anon_vma_lock_write(anon_vma);
anon_vma_unlock_write(anon_vma);
}
kmem_cache_free(anon_vma_cachep, anon_vma);
}
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| Person | Tokens | Prop | Commits | CommitProp |
peter zijlstra | peter zijlstra | 33 | 56.90% | 2 | 28.57% |
adrian bunk | adrian bunk | 17 | 29.31% | 1 | 14.29% |
ingo molnar | ingo molnar | 4 | 6.90% | 2 | 28.57% |
hugh dickins | hugh dickins | 3 | 5.17% | 1 | 14.29% |
konstantin khlebnikov | konstantin khlebnikov | 1 | 1.72% | 1 | 14.29% |
| Total | 58 | 100.00% | 7 | 100.00% |
static inline struct anon_vma_chain *anon_vma_chain_alloc(gfp_t gfp)
{
return kmem_cache_alloc(anon_vma_chain_cachep, gfp);
}
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rik van riel | rik van riel | 17 | 85.00% | 1 | 50.00% |
linus torvalds | linus torvalds | 3 | 15.00% | 1 | 50.00% |
| Total | 20 | 100.00% | 2 | 100.00% |
static void anon_vma_chain_free(struct anon_vma_chain *anon_vma_chain)
{
kmem_cache_free(anon_vma_chain_cachep, anon_vma_chain);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
rik van riel | rik van riel | 17 | 94.44% | 1 | 50.00% |
namhyung kim | namhyung kim | 1 | 5.56% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
static void anon_vma_chain_link(struct vm_area_struct *vma,
struct anon_vma_chain *avc,
struct anon_vma *anon_vma)
{
avc->vma = vma;
avc->anon_vma = anon_vma;
list_add(&avc->same_vma, &vma->anon_vma_chain);
anon_vma_interval_tree_insert(avc, &anon_vma->rb_root);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kautuk consul | kautuk consul | 54 | 96.43% | 1 | 50.00% |
michel lespinasse | michel lespinasse | 2 | 3.57% | 1 | 50.00% |
| Total | 56 | 100.00% | 2 | 100.00% |
/**
* anon_vma_prepare - attach an anon_vma to a memory region
* @vma: the memory region in question
*
* This makes sure the memory mapping described by 'vma' has
* an 'anon_vma' attached to it, so that we can associate the
* anonymous pages mapped into it with that anon_vma.
*
* The common case will be that we already have one, but if
* not we either need to find an adjacent mapping that we
* can re-use the anon_vma from (very common when the only
* reason for splitting a vma has been mprotect()), or we
* allocate a new one.
*
* Anon-vma allocations are very subtle, because we may have
* optimistically looked up an anon_vma in page_lock_anon_vma_read()
* and that may actually touch the spinlock even in the newly
* allocated vma (it depends on RCU to make sure that the
* anon_vma isn't actually destroyed).
*
* As a result, we need to do proper anon_vma locking even
* for the new allocation. At the same time, we do not want
* to do any locking for the common case of already having
* an anon_vma.
*
* This must be called with the mmap_sem held for reading.
*/
int anon_vma_prepare(struct vm_area_struct *vma)
{
struct anon_vma *anon_vma = vma->anon_vma;
struct anon_vma_chain *avc;
might_sleep();
if (unlikely(!anon_vma)) {
struct mm_struct *mm = vma->vm_mm;
struct anon_vma *allocated;
avc = anon_vma_chain_alloc(GFP_KERNEL);
if (!avc)
goto out_enomem;
anon_vma = find_mergeable_anon_vma(vma);
allocated = NULL;
if (!anon_vma) {
anon_vma = anon_vma_alloc();
if (unlikely(!anon_vma))
goto out_enomem_free_avc;
allocated = anon_vma;
}
anon_vma_lock_write(anon_vma);
/* page_table_lock to protect against threads */
spin_lock(&mm->page_table_lock);
if (likely(!vma->anon_vma)) {
vma->anon_vma = anon_vma;
anon_vma_chain_link(vma, avc, anon_vma);
/* vma reference or self-parent link for new root */
anon_vma->degree++;
allocated = NULL;
avc = NULL;
}
spin_unlock(&mm->page_table_lock);
anon_vma_unlock_write(anon_vma);
if (unlikely(allocated))
put_anon_vma(allocated);
if (unlikely(avc))
anon_vma_chain_free(avc);
}
return 0;
out_enomem_free_avc:
anon_vma_chain_free(avc);
out_enomem:
return -ENOMEM;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
andrew morton | andrew morton | 127 | 59.91% | 2 | 16.67% |
rik van riel | rik van riel | 40 | 18.87% | 1 | 8.33% |
linus torvalds | linus torvalds | 12 | 5.66% | 2 | 16.67% |
oleg nesterov | oleg nesterov | 11 | 5.19% | 1 | 8.33% |
hugh dickins | hugh dickins | 11 | 5.19% | 1 | 8.33% |
konstantin khlebnikov | konstantin khlebnikov | 7 | 3.30% | 2 | 16.67% |
kautuk consul | kautuk consul | 2 | 0.94% | 1 | 8.33% |
ingo molnar | ingo molnar | 1 | 0.47% | 1 | 8.33% |
peter zijlstra | peter zijlstra | 1 | 0.47% | 1 | 8.33% |
| Total | 212 | 100.00% | 12 | 100.00% |
/*
* This is a useful helper function for locking the anon_vma root as
* we traverse the vma->anon_vma_chain, looping over anon_vma's that
* have the same vma.
*
* Such anon_vma's should have the same root, so you'd expect to see
* just a single mutex_lock for the whole traversal.
*/
static inline struct anon_vma *lock_anon_vma_root(struct anon_vma *root, struct anon_vma *anon_vma)
{
struct anon_vma *new_root = anon_vma->root;
if (new_root != root) {
if (WARN_ON_ONCE(root))
up_write(&root->rwsem);
root = new_root;
down_write(&root->rwsem);
}
return root;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
linus torvalds | linus torvalds | 62 | 93.94% | 1 | 50.00% |
ingo molnar | ingo molnar | 4 | 6.06% | 1 | 50.00% |
| Total | 66 | 100.00% | 2 | 100.00% |
static inline void unlock_anon_vma_root(struct anon_vma *root)
{
if (root)
up_write(&root->rwsem);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
linus torvalds | linus torvalds | 22 | 91.67% | 1 | 50.00% |
ingo molnar | ingo molnar | 2 | 8.33% | 1 | 50.00% |
| Total | 24 | 100.00% | 2 | 100.00% |
/*
* Attach the anon_vmas from src to dst.
* Returns 0 on success, -ENOMEM on failure.
*
* If dst->anon_vma is NULL this function tries to find and reuse existing
* anon_vma which has no vmas and only one child anon_vma. This prevents
* degradation of anon_vma hierarchy to endless linear chain in case of
* constantly forking task. On the other hand, an anon_vma with more than one
* child isn't reused even if there was no alive vma, thus rmap walker has a
* good chance of avoiding scanning the whole hierarchy when it searches where
* page is mapped.
*/
int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src)
{
struct anon_vma_chain *avc, *pavc;
struct anon_vma *root = NULL;
list_for_each_entry_reverse(pavc, &src->anon_vma_chain, same_vma) {
struct anon_vma *anon_vma;
avc = anon_vma_chain_alloc(GFP_NOWAIT | __GFP_NOWARN);
if (unlikely(!avc)) {
unlock_anon_vma_root(root);
root = NULL;
avc = anon_vma_chain_alloc(GFP_KERNEL);
if (!avc)
goto enomem_failure;
}
anon_vma = pavc->anon_vma;
root = lock_anon_vma_root(root, anon_vma);
anon_vma_chain_link(dst, avc, anon_vma);
/*
* Reuse existing anon_vma if its degree lower than two,
* that means it has no vma and only one anon_vma child.
*
* Do not chose parent anon_vma, otherwise first child
* will always reuse it. Root anon_vma is never reused:
* it has self-parent reference and at least one child.
*/
if (!dst->anon_vma && anon_vma != src->anon_vma &&
anon_vma->degree < 2)
dst->anon_vma = anon_vma;
}
if (dst->anon_vma)
dst->anon_vma->degree++;
unlock_anon_vma_root(root);
return 0;
enomem_failure:
/*
* dst->anon_vma is dropped here otherwise its degree can be incorrectly
* decremented in unlink_anon_vmas().
* We can safely do this because callers of anon_vma_clone() don't care
* about dst->anon_vma if anon_vma_clone() failed.
*/
dst->anon_vma = NULL;
unlink_anon_vmas(dst);
return -ENOMEM;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
linus torvalds | linus torvalds | 64 | 36.16% | 3 | 42.86% |
rik van riel | rik van riel | 50 | 28.25% | 1 | 14.29% |
konstantin khlebnikov | konstantin khlebnikov | 39 | 22.03% | 1 | 14.29% |
andrew morton | andrew morton | 17 | 9.60% | 1 | 14.29% |
leon yu | leon yu | 7 | 3.95% | 1 | 14.29% |
| Total | 177 | 100.00% | 7 | 100.00% |
/*
* Attach vma to its own anon_vma, as well as to the anon_vmas that
* the corresponding VMA in the parent process is attached to.
* Returns 0 on success, non-zero on failure.
*/
int anon_vma_fork(struct vm_area_struct *vma, struct vm_area_struct *pvma)
{
struct anon_vma_chain *avc;
struct anon_vma *anon_vma;
int error;
/* Don't bother if the parent process has no anon_vma here. */
if (!pvma->anon_vma)
return 0;
/* Drop inherited anon_vma, we'll reuse existing or allocate new. */
vma->anon_vma = NULL;
/*
* First, attach the new VMA to the parent VMA's anon_vmas,
* so rmap can find non-COWed pages in child processes.
*/
error = anon_vma_clone(vma, pvma);
if (error)
return error;
/* An existing anon_vma has been reused, all done then. */
if (vma->anon_vma)
return 0;
/* Then add our own anon_vma. */
anon_vma = anon_vma_alloc();
if (!anon_vma)
goto out_error;
avc = anon_vma_chain_alloc(GFP_KERNEL);
if (!avc)
goto out_error_free_anon_vma;
/*
* The root anon_vma's spinlock is the lock actually used when we
* lock any of the anon_vmas in this anon_vma tree.
*/
anon_vma->root = pvma->anon_vma->root;
anon_vma->parent = pvma->anon_vma;
/*
* With refcounts, an anon_vma can stay around longer than the
* process it belongs to. The root anon_vma needs to be pinned until
* this anon_vma is freed, because the lock lives in the root.
*/
get_anon_vma(anon_vma->root);
/* Mark this anon_vma as the one where our new (COWed) pages go. */
vma->anon_vma = anon_vma;
anon_vma_lock_write(anon_vma);
anon_vma_chain_link(vma, avc, anon_vma);
anon_vma->parent->degree++;
anon_vma_unlock_write(anon_vma);
return 0;
out_error_free_anon_vma:
put_anon_vma(anon_vma);
out_error:
unlink_anon_vmas(vma);
return -ENOMEM;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
rik van riel | rik van riel | 100 | 54.64% | 4 | 33.33% |
konstantin khlebnikov | konstantin khlebnikov | 33 | 18.03% | 2 | 16.67% |
andrew morton | andrew morton | 26 | 14.21% | 1 | 8.33% |
linus torvalds | linus torvalds | 11 | 6.01% | 2 | 16.67% |
daniel forrest | daniel forrest | 10 | 5.46% | 1 | 8.33% |
peter zijlstra | peter zijlstra | 2 | 1.09% | 1 | 8.33% |
ingo molnar | ingo molnar | 1 | 0.55% | 1 | 8.33% |
| Total | 183 | 100.00% | 12 | 100.00% |
void unlink_anon_vmas(struct vm_area_struct *vma)
{
struct anon_vma_chain *avc, *next;
struct anon_vma *root = NULL;
/*
* Unlink each anon_vma chained to the VMA. This list is ordered
* from newest to oldest, ensuring the root anon_vma gets freed last.
*/
list_for_each_entry_safe(avc, next, &vma->anon_vma_chain, same_vma) {
struct anon_vma *anon_vma = avc->anon_vma;
root = lock_anon_vma_root(root, anon_vma);
anon_vma_interval_tree_remove(avc, &anon_vma->rb_root);
/*
* Leave empty anon_vmas on the list - we'll need
* to free them outside the lock.
*/
if (RB_EMPTY_ROOT(&anon_vma->rb_root)) {
anon_vma->parent->degree--;
continue;
}
list_del(&avc->same_vma);
anon_vma_chain_free(avc);
}
if (vma->anon_vma)
vma->anon_vma->degree--;
unlock_anon_vma_root(root);
/*
* Iterate the list once more, it now only contains empty and unlinked
* anon_vmas, destroy them. Could not do before due to __put_anon_vma()
* needing to write-acquire the anon_vma->root->rwsem.
*/
list_for_each_entry_safe(avc, next, &vma->anon_vma_chain, same_vma) {
struct anon_vma *anon_vma = avc->anon_vma;
VM_WARN_ON(anon_vma->degree);
put_anon_vma(anon_vma);
list_del(&avc->same_vma);
anon_vma_chain_free(avc);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
peter zijlstra | peter zijlstra | 65 | 39.39% | 1 | 12.50% |
andrew morton | andrew morton | 33 | 20.00% | 1 | 12.50% |
rik van riel | rik van riel | 30 | 18.18% | 2 | 25.00% |
konstantin khlebnikov | konstantin khlebnikov | 29 | 17.58% | 2 | 25.00% |
michel lespinasse | michel lespinasse | 7 | 4.24% | 1 | 12.50% |
ingo molnar | ingo molnar | 1 | 0.61% | 1 | 12.50% |
| Total | 165 | 100.00% | 8 | 100.00% |
static void anon_vma_ctor(void *data)
{
struct anon_vma *anon_vma = data;
init_rwsem(&anon_vma->rwsem);
atomic_set(&anon_vma->refcount, 0);
anon_vma->rb_root = RB_ROOT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
andrew morton | andrew morton | 23 | 56.10% | 1 | 16.67% |
peter zijlstra | peter zijlstra | 6 | 14.63% | 1 | 16.67% |
mel gorman | mel gorman | 4 | 9.76% | 1 | 16.67% |
michel lespinasse | michel lespinasse | 3 | 7.32% | 1 | 16.67% |
christoph lameter | christoph lameter | 3 | 7.32% | 1 | 16.67% |
ingo molnar | ingo molnar | 2 | 4.88% | 1 | 16.67% |
| Total | 41 | 100.00% | 6 | 100.00% |
void __init anon_vma_init(void)
{
anon_vma_cachep = kmem_cache_create("anon_vma", sizeof(struct anon_vma),
0, SLAB_DESTROY_BY_RCU|SLAB_PANIC|SLAB_ACCOUNT,
anon_vma_ctor);
anon_vma_chain_cachep = KMEM_CACHE(anon_vma_chain,
SLAB_PANIC|SLAB_ACCOUNT);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
andrew morton | andrew morton | 27 | 64.29% | 1 | 25.00% |
rik van riel | rik van riel | 9 | 21.43% | 1 | 25.00% |
vladimir davydov | vladimir davydov | 4 | 9.52% | 1 | 25.00% |
hugh dickins | hugh dickins | 2 | 4.76% | 1 | 25.00% |
| Total | 42 | 100.00% | 4 | 100.00% |
/*
* Getting a lock on a stable anon_vma from a page off the LRU is tricky!
*
* Since there is no serialization what so ever against page_remove_rmap()
* the best this function can do is return a locked anon_vma that might
* have been relevant to this page.
*
* The page might have been remapped to a different anon_vma or the anon_vma
* returned may already be freed (and even reused).
*
* In case it was remapped to a different anon_vma, the new anon_vma will be a
* child of the old anon_vma, and the anon_vma lifetime rules will therefore
* ensure that any anon_vma obtained from the page will still be valid for as
* long as we observe page_mapped() [ hence all those page_mapped() tests ].
*
* All users of this function must be very careful when walking the anon_vma
* chain and verify that the page in question is indeed mapped in it
* [ something equivalent to page_mapped_in_vma() ].
*
* Since anon_vma's slab is DESTROY_BY_RCU and we know from page_remove_rmap()
* that the anon_vma pointer from page->mapping is valid if there is a
* mapcount, we can dereference the anon_vma after observing those.
*/
struct anon_vma *page_get_anon_vma(struct page *page)
{
struct anon_vma *anon_vma = NULL;
unsigned long anon_mapping;
rcu_read_lock();
anon_mapping = (unsigned long)READ_ONCE(page->mapping);
if ((anon_mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON)
goto out;
if (!page_mapped(page))
goto out;
anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
if (!atomic_inc_not_zero(&anon_vma->refcount)) {
anon_vma = NULL;
goto out;
}
/*
* If this page is still mapped, then its anon_vma cannot have been
* freed. But if it has been unmapped, we have no security against the
* anon_vma structure being freed and reused (for another anon_vma:
* SLAB_DESTROY_BY_RCU guarantees that - so the atomic_inc_not_zero()
* above cannot corrupt).
*/
if (!page_mapped(page)) {
rcu_read_unlock();
put_anon_vma(anon_vma);
return NULL;
}
out:
rcu_read_unlock();
return anon_vma;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
hugh dickins | hugh dickins | 97 | 76.98% | 5 | 71.43% |
peter zijlstra | peter zijlstra | 28 | 22.22% | 1 | 14.29% |
jason low | jason low | 1 | 0.79% | 1 | 14.29% |
| Total | 126 | 100.00% | 7 | 100.00% |
/*
* Similar to page_get_anon_vma() except it locks the anon_vma.
*
* Its a little more complex as it tries to keep the fast path to a single
* atomic op -- the trylock. If we fail the trylock, we fall back to getting a
* reference like with page_get_anon_vma() and then block on the mutex.
*/
struct anon_vma *page_lock_anon_vma_read(struct page *page)
{
struct anon_vma *anon_vma = NULL;
struct anon_vma *root_anon_vma;
unsigned long anon_mapping;
rcu_read_lock();
anon_mapping = (unsigned long)READ_ONCE(page->mapping);
if ((anon_mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON)
goto out;
if (!page_mapped(page))
goto out;
anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
root_anon_vma = READ_ONCE(anon_vma->root);
if (down_read_trylock(&root_anon_vma->rwsem)) {
/*
* If the page is still mapped, then this anon_vma is still
* its anon_vma, and holding the mutex ensures that it will
* not go away, see anon_vma_free().
*/
if (!page_mapped(page)) {
up_read(&root_anon_vma->rwsem);
anon_vma = NULL;
}
goto out;
}
/* trylock failed, we got to sleep */
if (!atomic_inc_not_zero(&anon_vma->refcount)) {
anon_vma = NULL;
goto out;
}
if (!page_mapped(page)) {
rcu_read_unlock();
put_anon_vma(anon_vma);
return NULL;
}
/* we pinned the anon_vma, its safe to sleep */
rcu_read_unlock();
anon_vma_lock_read(anon_vma);
if (atomic_dec_and_test(&anon_vma->refcount)) {
/*
* Oops, we held the last refcount, release the lock
* and bail -- can't simply use put_anon_vma() because
* we'll deadlock on the anon_vma_lock_write() recursion.
*/
anon_vma_unlock_read(anon_vma);
__put_anon_vma(anon_vma);
anon_vma = NULL;
}
return anon_vma;
out:
rcu_read_unlock();
return anon_vma;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
peter zijlstra | peter zijlstra | 181 | 83.41% | 3 | 33.33% |
hugh dickins | hugh dickins | 26 | 11.98% | 3 | 33.33% |
ingo molnar | ingo molnar | 8 | 3.69% | 2 | 22.22% |
jason low | jason low | 2 | 0.92% | 1 | 11.11% |
| Total | 217 | 100.00% | 9 | 100.00% |
void page_unlock_anon_vma_read(struct anon_vma *anon_vma)
{
anon_vma_unlock_read(anon_vma);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
oleg nesterov | oleg nesterov | 12 | 80.00% | 1 | 33.33% |
ingo molnar | ingo molnar | 2 | 13.33% | 1 | 33.33% |
peter zijlstra | peter zijlstra | 1 | 6.67% | 1 | 33.33% |
| Total | 15 | 100.00% | 3 | 100.00% |
#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
/*
* Flush TLB entries for recently unmapped pages from remote CPUs. It is
* important if a PTE was dirty when it was unmapped that it's flushed
* before any IO is initiated on the page to prevent lost writes. Similarly,
* it must be flushed before freeing to prevent data leakage.
*/
void try_to_unmap_flush(void)
{
struct tlbflush_unmap_batch *tlb_ubc = ¤t->tlb_ubc;
int cpu;
if (!tlb_ubc->flush_required)
return;
cpu = get_cpu();
if (cpumask_test_cpu(cpu, &tlb_ubc->cpumask)) {
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
local_flush_tlb();
trace_tlb_flush(TLB_LOCAL_SHOOTDOWN, TLB_FLUSH_ALL);
}
if (cpumask_any_but(&tlb_ubc->cpumask, cpu) < nr_cpu_ids)
flush_tlb_others(&tlb_ubc->cpumask, NULL, 0, TLB_FLUSH_ALL);
cpumask_clear(&tlb_ubc->cpumask);
tlb_ubc->flush_required = false;
tlb_ubc->writable = false;
put_cpu();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mel gorman | mel gorman | 95 | 84.07% | 2 | 66.67% |
nadav amit | nadav amit | 18 | 15.93% | 1 | 33.33% |
| Total | 113 | 100.00% | 3 | 100.00% |
/* Flush iff there are potentially writable TLB entries that can race with IO */
void try_to_unmap_flush_dirty(void)
{
struct tlbflush_unmap_batch *tlb_ubc = ¤t->tlb_ubc;
if (tlb_ubc->writable)
try_to_unmap_flush();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mel gorman | mel gorman | 26 | 100.00% | 1 | 100.00% |
| Total | 26 | 100.00% | 1 | 100.00% |
static void set_tlb_ubc_flush_pending(struct mm_struct *mm,
struct page *page, bool writable)
{
struct tlbflush_unmap_batch *tlb_ubc = ¤t->tlb_ubc;
cpumask_or(&tlb_ubc->cpumask, &tlb_ubc->cpumask, mm_cpumask(mm));
tlb_ubc->flush_required = true;
/*
* If the PTE was dirty then it's best to assume it's writable. The
* caller must use try_to_unmap_flush_dirty() or try_to_unmap_flush()
* before the page is queued for IO.
*/
if (writable)
tlb_ubc->writable = true;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mel gorman | mel gorman | 64 | 100.00% | 2 | 100.00% |
| Total | 64 | 100.00% | 2 | 100.00% |
/*
* Returns true if the TLB flush should be deferred to the end of a batch of
* unmap operations to reduce IPIs.
*/
static bool should_defer_flush(struct mm_struct *mm, enum ttu_flags flags)
{
bool should_defer = false;
if (!(flags & TTU_BATCH_FLUSH))
return false;
/* If remote CPUs need to be flushed then defer batch the flush */
if (cpumask_any_but(mm_cpumask(mm), get_cpu()) < nr_cpu_ids)
should_defer = true;
put_cpu();
return should_defer;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mel gorman | mel gorman | 58 | 100.00% | 1 | 100.00% |
| Total | 58 | 100.00% | 1 | 100.00% |
#else
static void set_tlb_ubc_flush_pending(struct mm_struct *mm,
struct page *page, bool writable)
{
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mel gorman | mel gorman | 18 | 100.00% | 2 | 100.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
static bool should_defer_flush(struct mm_struct *mm, enum ttu_flags flags)
{
return false;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
mel gorman | mel gorman | 18 | 100.00% | 1 | 100.00% |
| Total | 18 | 100.00% | 1 | 100.00% |
#endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
/*
* At what user virtual address is page expected in vma?
* Caller should check the page is actually part of the vma.
*/
unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
{
unsigned long address;
if (PageAnon(page)) {
struct anon_vma *page__anon_vma = page_anon_vma(page);
/*
* Note: swapoff's unuse_vma() is more efficient with this
* check, and needs it to match anon_vma when KSM is active.
*/
if (!vma->anon_vma || !page__anon_vma ||
vma->anon_vma->root != page__anon_vma->root)
return -EFAULT;
} else if (page->mapping) {
if (!vma->vm_file || vma->vm_file->f_mapping != page->mapping)
return -EFAULT;
} else
return -EFAULT;
address = __vma_address(page, vma);
if (unlikely(address < vma->vm_start || address >= vma->vm_end))
return -EFAULT;
return address;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
hugh dickins | hugh dickins | 84 | 63.64% | 3 | 60.00% |
michel lespinasse | michel lespinasse | 31 | 23.48% | 1 | 20.00% |
andrea arcangeli | andrea arcangeli | 17 | 12.88% | 1 | 20.00% |
| Total | 132 | 100.00% | 5 | 100.00% |
pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd = NULL;
pmd_t pmde;
pgd = pgd_offset(mm, address);
if (!pgd_present(*pgd))
goto out;
pud = pud_offset(pgd, address);
if (!pud_present(*pud))
goto out;
pmd = pmd_offset(pud, address);
/*
* Some THP functions use the sequence pmdp_huge_clear_flush(), set_pmd_at()
* without holding anon_vma lock for write. So when looking for a
* genuine pmde (in which to find pte), test present and !THP together.
*/
pmde = *pmd;
barrier();
if (!pmd_present(pmde) || pmd_trans_huge(pmde))
pmd = NULL;
out:
return pmd;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
bob liu | bob liu | 96 | 84.21% | 1 | 25.00% |
hugh dickins | hugh dickins | 14 | 12.28% | 1 | 25.00% |
christian borntraeger | christian borntraeger | 3 | 2.63% | 1 | 25.00% |
aneesh kumar | aneesh kumar | 1 | 0.88% | 1 | 25.00% |
| Total | 114 | 100.00% | 4 | 100.00% |
/*
* Check that @page is mapped at @address into @mm.
*
* If @sync is false, page_check_address may perform a racy check to avoid
* the page table lock when the pte is not present (helpful when reclaiming
* highly shared pages).
*
* On success returns with pte mapped and locked.
*/
pte_t *__page_check_address(struct page *page, struct mm_struct *mm,
unsigned long address, spinlock_t **ptlp, int sync)
{
pmd_t *pmd;
pte_t *pte;
spinlock_t *ptl;
if (unlikely(PageHuge(page))) {
/* when pud is not present, pte will be NULL */
pte = huge_pte_offset(mm, address);
if (!pte)
return NULL;
ptl = huge_pte_lockptr(page_hstate(page), mm, pte);
goto check;
}
pmd = mm_find_pmd(mm, address);
if (!pmd)
return NULL;
pte = pte_offset_map(pmd, address);
/* Make a quick check before getting the lock */
if (!sync && !pte_present(*pte)) {
pte_unmap(pte);
return NULL;
}
ptl = pte_lockptr(mm, pmd);
check:
spin_lock(ptl);
if (pte_present(*pte) && page_to_pfn(page) == pte_pfn(*pte)) {
*ptlp = ptl;
return pte;
}
pte_unmap_unlock(pte, ptl);
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
hugh dickins | hugh dickins | 57 | 29.84% | 2 | 14.29% |
andrew morton | andrew morton | 57 | 29.84% | 5 | 35.71% |
naoya horiguchi | naoya horiguchi | 30 | 15.71% | 1 | 7.14% |
nikita danilov | nikita danilov | 19 | 9.95% | 1 | 7.14% |
kirill a. shutemov | kirill a. shutemov | 10 | 5.24% | 1 | 7.14% |
jianguo wu | jianguo wu | 9 | 4.71% | 1 | 7.14% |
nick piggin | nick piggin | 6 | 3.14% | 1 | 7.14% |
bob liu | bob liu | 2 | 1.05% | 1 | 7.14% |
namhyung kim | namhyung kim | 1 | 0.52% | 1 | 7.14% |
| Total | 191 | 100.00% | 14 | 100.00% |
/**
* page_mapped_in_vma - check whether a page is really mapped in a VMA
* @page: the page to test
* @vma: the VMA to test
*
* Returns 1 if the page is mapped into the page tables of the VMA, 0
* if the page is not mapped into the page tables of this VMA. Only
* valid for normal file or anonymous VMAs.
*/
int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma)
{
unsigned long address;
pte_t *pte;
spinlock_t *ptl;
address = __vma_address(page, vma);
if (unlikely(address < vma->vm_start || address >= vma->vm_end))
return 0;
pte = page_check_address(page, vma->vm_mm, address, &ptl, 1);
if (!pte) /* the page is not in this mm */
return 0;
pte_unmap_unlock(pte, ptl);
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
nick piggin | nick piggin | 79 | 84.95% | 1 | 50.00% |
michel lespinasse | michel lespinasse | 14 | 15.05% | 1 | 50.00% |
| Total | 93 | 100.00% | 2 | 100.00% |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/*
* Check that @page is mapped at @address into @mm. In contrast to
* page_check_address(), this function can handle transparent huge pages.
*
* On success returns true with pte mapped and locked. For PMD-mapped
* transparent huge pages *@ptep is set to NULL.
*/
bool page_check_address_transhuge(struct page *page, struct mm_struct *mm,
unsigned long address, pmd_t **pmdp,
pte_t **ptep, spinlock_t **ptlp)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
spinlock_t *ptl;
if (unlikely(PageHuge(page))) {
/* when pud is not present, pte will be NULL */
pte = huge_pte_offset(mm, address);
if (!pte)
return false;
ptl = huge_pte_lockptr(page_hstate(page), mm, pte);
pmd = NULL;
goto check_pte;
}
pgd = pgd_offset(mm, address);
if (!pgd_present(*pgd))
return false;
pud = pud_offset(pgd, address);
if (!pud_present(*pud))
return false;
pmd = pmd_offset(pud, address);
if (pmd_trans_huge(*pmd)) {
ptl = pmd_lock(mm, pmd);
if (!pmd_present(*pmd))
goto unlock_pmd;
if (unlikely(!pmd_trans_huge(*pmd))) {
spin_unlock(ptl);
goto map_pte;
}
if (pmd_page(*pmd) != page)
goto unlock_pmd;
pte = NULL;
goto found;
unlock_pmd:
spin_unlock(ptl);
return false;
} else {
pmd_t pmde = *pmd;
barrier();
if (!pmd_present(pmde) || pmd_trans_huge(pmde))
return false;
}
map_pte:
pte = pte_offset_map(pmd, address);
if (!pte_present(*pte)) {
pte_unmap(pte);
return false;
}
ptl = pte_lockptr(mm, pmd);
check_pte:
spin_lock(ptl);
if (!pte_present(*pte)) {
pte_unmap_unlock(pte, ptl);
return false;
}
/* THP can be referenced by any subpage */
if (pte_pfn(*pte) - page_to_pfn(page) >= hpage_nr_pages(page)) {
pte_unmap_unlock(pte, ptl);
return false;
}
found:
*ptep = pte;
*pmdp = pmd;
*ptlp = ptl;
return true;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 260 | 67.53% | 2 | 18.18% |
vladimir davydov | vladimir davydov | 54 | 14.03% | 1 | 9.09% |
andrea arcangeli | andrea arcangeli | 36 | 9.35% | 2 | 18.18% |
nikita danilov | nikita danilov | 24 | 6.23% | 1 | 9.09% |
joonsoo kim | joonsoo kim | 5 | 1.30% | 1 | 9.09% |
hugh dickins | hugh dickins | 4 | 1.04% | 2 | 18.18% |
nick piggin | nick piggin | 1 | 0.26% | 1 | 9.09% |
fengguang wu | fengguang wu | 1 | 0.26% | 1 | 9.09% |
| Total | 385 | 100.00% | 11 | 100.00% |
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
struct page_referenced_arg {
int mapcount;
int referenced;
unsigned long vm_flags;
struct mem_cgroup *memcg;
};
/*
* arg: page_referenced_arg will be passed
*/
static int page_referenced_one(struct page *page, struct vm_area_struct *vma,
unsigned long address, void *arg)
{
struct mm_struct *mm = vma->vm_mm;
struct page_referenced_arg *pra = arg;
pmd_t *pmd;
pte_t *pte;
spinlock_t *ptl;
int referenced = 0;
if (!page_check_address_transhuge(page, mm, address, &pmd, &pte, &ptl))
return SWAP_AGAIN;
if (vma->vm_flags & VM_LOCKED) {
if (pte)
pte_unmap(pte);
spin_unlock(ptl);
pra->vm_flags |= VM_LOCKED;
return SWAP_FAIL; /* To break the loop */
}
if (pte) {
if (ptep_clear_flush_young_notify(vma, address, pte)) {
/*
* Don't treat a reference through a sequentially read
* mapping as such. If the page has been used in
* another mapping, we will catch it; if this other
* mapping is already gone, the unmap path will have
* set PG_referenced or activated the page.
*/
if (likely(!(vma->vm_flags & VM_SEQ_READ)))
referenced++;
}
pte_unmap(pte);
} else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
if (pmdp_clear_flush_young_notify(vma, address, pmd))
referenced++;
} else {
/* unexpected pmd-mapped page? */
WARN_ON_ONCE(1);
}
spin_unlock(ptl);
if (referenced)
clear_page_idle(page);
if (test_and_clear_page_young(page))
referenced++;
if (referenced) {
pra->referenced++;
pra->vm_flags |= vma->vm_flags;
}
pra->mapcount--;
if (!pra->mapcount)
return SWAP_SUCCESS; /* To break the loop */
return SWAP_AGAIN;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
vladimir davydov | vladimir davydov | 152 | 60.32% | 2 | 12.50% |
joonsoo kim | joonsoo kim | 50 | 19.84% | 1 | 6.25% |
andrea arcangeli | andrea arcangeli | 20 | 7.94% | 2 | 12.50% |
andrew morton | andrew morton | 15 | 5.95% | 5 | 31.25% |
hugh dickins | hugh dickins | 6 | 2.38% | 2 | 12.50% |
balbir singh | balbir singh | 4 | 1.59% | 1 | 6.25% |
johannes weiner | johannes weiner | 3 | 1.19% | 1 | 6.25% |
fengguang wu | fengguang wu | 1 | 0.40% | 1 | 6.25% |
david rientjes | david rientjes | 1 | 0.40% | 1 | 6.25% |
| Total | 252 | 100.00% | 16 | 100.00% |
static bool invalid_page_referenced_vma(struct vm_area_struct *vma, void *arg)
{
struct page_referenced_arg *pra = arg;
struct mem_cgroup *memcg = pra->memcg;
if (!mm_match_cgroup(vma->vm_mm, memcg))
return true;
return false;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
joonsoo kim | joonsoo kim | 43 | 87.76% | 1 | 25.00% |
andrew morton | andrew morton | 6 | 12.24% | 3 | 75.00% |
| Total | 49 | 100.00% | 4 | 100.00% |
/**
* page_referenced - test if the page was referenced
* @page: the page to test
* @is_locked: caller holds lock on the page
* @memcg: target memory cgroup
* @vm_flags: collect encountered vma->vm_flags who actually referenced the page
*
* Quick test_and_clear_referenced for all mappings to a page,
* returns the number of ptes which referenced the page.
*/
int page_referenced(struct page *page,
int is_locked,
struct mem_cgroup *memcg,
unsigned long *vm_flags)
{
int ret;
int we_locked = 0;
struct page_referenced_arg pra = {
.mapcount = total_mapcount(page),
.memcg = memcg,
};
struct rmap_walk_control rwc = {
.rmap_one = page_referenced_one,
.arg = (void *)&pra,
.anon_lock = page_lock_anon_vma_read,
};
*vm_flags = 0;
if (!page_mapped(page))
return 0;
if (!page_rmapping(page))
return 0;
if (!is_locked && (!PageAnon(page) || PageKsm(page))) {
we_locked = trylock_page(page);
if (!we_locked)
return 1;
}
/*
* If we are reclaiming on behalf of a cgroup, skip
* counting on behalf of references from different
* cgroups
*/
if (memcg) {
rwc.invalid_vma = invalid_page_referenced_vma;
}
ret = rmap_walk(page, &rwc);
*vm_flags = pra.vm_flags;
if (we_locked)
unlock_page(page);
return pra.referenced;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
joonsoo kim | joonsoo kim | 80 | 43.96% | 1 | 7.14% |
hugh dickins | hugh dickins | 52 | 28.57% | 3 | 21.43% |
andrew morton | andrew morton | 32 | 17.58% | 6 | 42.86% |
fengguang wu | fengguang wu | 11 | 6.04% | 1 | 7.14% |
balbir singh | balbir singh | 4 | 2.20% | 1 | 7.14% |
johannes weiner | johannes weiner | 2 | 1.10% | 1 | 7.14% |
kirill a. shutemov | kirill a. shutemov | 1 | 0.55% | 1 | 7.14% |
| Total | 182 | 100.00% | 14 | 100.00% |
static int page_mkclean_one(struct page *page, struct vm_area_struct *vma,
unsigned long address, void *arg)
{
struct mm_struct *mm = vma->vm_mm;
pte_t *pte;
spinlock_t *ptl;
int ret = 0;
int *cleaned = arg;
pte = page_check_address(page, mm, address, &ptl, 1);
if (!pte)
goto out;
if (pte_dirty(*pte) || pte_write(*pte)) {
pte_t entry;
flush_cache_page(vma, address, pte_pfn(*pte));
entry = ptep_clear_flush(vma, address, pte);
entry = pte_wrprotect(entry);
entry = pte_mkclean(entry);
set_pte_at(mm, address, pte, entry);
ret = 1;
}
pte_unmap_unlock(pte, ptl);
if (ret) {
mmu_notifier_invalidate_page(mm, address);
(*cleaned)++;
}
out:
return SWAP_AGAIN;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
peter zijlstra | peter zijlstra | 141 | 78.77% | 2 | 28.57% |
joonsoo kim | joonsoo kim | 19 | 10.61% | 1 | 14.29% |
sagi grimberg | sagi grimberg | 12 | 6.70% | 1 | 14.29% |
hugh dickins | hugh dickins | 4 | 2.23% | 1 | 14.29% |
nick piggin | nick piggin | 2 | 1.12% | 1 | 14.29% |
al viro | al viro | 1 | 0.56% | 1 | 14.29% |
| Total | 179 | 100.00% | 7 | 100.00% |
static bool invalid_mkclean_vma(struct vm_area_struct *vma, void *arg)
{
if (vma->vm_flags & VM_SHARED)
return false;
return true;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
peter zijlstra | peter zijlstra | 19 | 65.52% | 1 | 33.33% |
joonsoo kim | joonsoo kim | 8 | 27.59% | 1 | 33.33% |
fengguang wu | fengguang wu | 2 | 6.90% | 1 | 33.33% |
| Total | 29 | 100.00% | 3 | 100.00% |
int page_mkclean(struct page *page)
{
int cleaned = 0;
struct address_space *mapping;
struct rmap_walk_control rwc = {
.arg = (void *)&cleaned,
.rmap_one = page_mkclean_one,
.invalid_vma = invalid_mkclean_vma,
};
BUG_ON(!PageLocked(page));
if (!page_mapped(page))
return 0;
mapping = page_mapping(page);
if (!mapping)
return 0;
rmap_walk(page, &rwc);
return cleaned;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
joonsoo kim | joonsoo kim | 47 | 51.09% | 1 | 50.00% |
peter zijlstra | peter zijlstra | 45 | 48.91% | 1 | 50.00% |
| Total | 92 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(page_mkclean);
/**
* page_move_anon_rmap - move a page to our anon_vma
* @page: the page to move to our anon_vma
* @vma: the vma the page belongs to
*
* When a page belongs exclusively to one process after a COW event,
* that page can be moved into the anon_vma that belongs to just that
* process, so the rmap code will not search the parent or sibling
* processes.
*/
void page_move_anon_rmap(struct page *page, struct vm_area_struct *vma)
{
struct anon_vma *anon_vma = vma->anon_vma;
page = compound_head(page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_VMA(!anon_vma, vma);
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
/*
* Ensure that anon_vma and the PAGE_MAPPING_ANON bit are written
* simultaneously, so a concurrent reader (eg page_referenced()'s
* PageAnon()) will not see one without the other.
*/
WRITE_ONCE(page->mapping, (struct address_space *) anon_vma);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
rik van riel | rik van riel | 57 | 76.00% | 1 | 20.00% |
hugh dickins | hugh dickins | 7 | 9.33% | 1 | 20.00% |
sasha levin | sasha levin | 6 | 8.00% | 2 | 40.00% |
vladimir davydov | vladimir davydov | 5 | 6.67% | 1 | 20.00% |
| Total | 75 | 100.00% | 5 | 100.00% |
/**
* __page_set_anon_rmap - set up new anonymous rmap
* @page: Page to add to rmap
* @vma: VM area to add page to.
* @address: User virtual address of the mapping
* @exclusive: the page is exclusively owned by the current process
*/
static void __page_set_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address, int exclusive)
{
struct anon_vma *anon_vma = vma->anon_vma;
BUG_ON(!anon_vma);
if (PageAnon(page))
return;
/*
* If the page isn't exclusively mapped into this vma,
* we must use the _oldest_ possible anon_vma for the
* page mapping!
*/
if (!exclusive)
anon_vma = anon_vma->root;
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
page->mapping = (struct address_space *) anon_vma;
page->index = linear_page_index(vma, address);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
andrew morton | andrew morton | 33 | 36.67% | 4 | 33.33% |
nick piggin | nick piggin | 19 | 21.11% | 3 | 25.00% |
hugh dickins | hugh dickins | 10 | 11.11% | 1 | 8.33% |
andrea arcangeli | andrea arcangeli | 8 | 8.89% | 1 | 8.33% |
linus torvalds | linus torvalds | 7 | 7.78% | 1 | 8.33% |
rik van riel | rik van riel | 7 | 7.78% | 1 | 8.33% |
andi kleen | andi kleen | 6 | 6.67% | 1 | 8.33% |
| Total | 90 | 100.00% | 12 | 100.00% |
/**
* __page_check_anon_rmap - sanity check anonymous rmap addition
* @page: the page to add the mapping to
* @vma: the vm area in which the mapping is added
* @address: the user virtual address mapped
*/
static void __page_check_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
#ifdef CONFIG_DEBUG_VM
/*
* The page's anon-rmap details (mapping and index) are guaranteed to
* be set up correctly at this point.
*
* We have exclusion against page_add_anon_rmap because the caller
* always holds the page locked, except if called from page_dup_rmap,
* in which case the page is already known to be setup.
*
* We have exclusion against page_add_new_anon_rmap because those pages
* are initially only visible via the pagetables, and the pte is locked
* over the call to page_add_new_anon_rmap.
*/
BUG_ON(page_anon_vma(page)->root != vma->anon_vma->root);
BUG_ON(page_to_pgoff(page) != linear_page_index(vma, address));
#endif
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
nick piggin | nick piggin | 38 | 66.67% | 1 | 33.33% |
andrea arcangeli | andrea arcangeli | 16 | 28.07% | 1 | 33.33% |
kirill a. shutemov | kirill a. shutemov | 3 | 5.26% | 1 | 33.33% |
| Total | 57 | 100.00% | 3 | 100.00% |
/**
* page_add_anon_rmap - add pte mapping to an anonymous page
* @page: the page to add the mapping to
* @vma: the vm area in which the mapping is added
* @address: the user virtual address mapped
* @compound: charge the page as compound or small page
*
* The caller needs to hold the pte lock, and the page must be locked in
* the anon_vma case: to serialize mapping,index checking after setting,
* and to ensure that PageAnon is not being upgraded racily to PageKsm
* (but PageKsm is never downgraded to PageAnon).
*/
void page_add_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address, bool compound)
{
do_page_add_anon_rmap(page, vma, address, compound ? RMAP_COMPOUND : 0);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
nick piggin | nick piggin | 18 | 48.65% | 1 | 33.33% |
rik van riel | rik van riel | 12 | 32.43% | 1 | 33.33% |
kirill a. shutemov | kirill a. shutemov | 7 | 18.92% | 1 | 33.33% |
| Total | 37 | 100.00% | 3 | 100.00% |
/*
* Special version of the above for do_swap_page, which often runs
* into pages that are exclusively owned by the current process.
* Everybody else should continue to use page_add_anon_rmap above.
*/
void do_page_add_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address, int flags)
{
bool compound = flags & RMAP_COMPOUND;
bool first;
if (compound) {
atomic_t *mapcount;
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(!PageTransHuge(page), page);
mapcount = compound_mapcount_ptr(page);
first = atomic_inc_and_test(mapcount);
} else {
first = atomic_inc_and_test(&page->_mapcount);
}
if (first) {
int nr = compound ? hpage_nr_pages(page) : 1;
/*
* We use the irq-unsafe __{inc|mod}_zone_page_stat because
* these counters are not modified in interrupt context, and
* pte lock(a spinlock) is held, which implies preemption
* disabled.
*/
if (compound) {
__inc_zone_page_state(page,
NR_ANON_TRANSPARENT_HUGEPAGES);
}
__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
}
if (unlikely(PageKsm(page)))
return;
VM_BUG_ON_PAGE(!PageLocked(page), page);
/* address might be in next vma when migration races vma_adjust */
if (first)
__page_set_anon_rmap(page, vma, address,
flags & RMAP_EXCLUSIVE);
else
__page_check_anon_rmap(page, vma, address);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 94 | 50.81% | 4 | 28.57% |
nick piggin | nick piggin | 30 | 16.22% | 2 | 14.29% |
hugh dickins | hugh dickins | 26 | 14.05% | 2 | 14.29% |
rik van riel | rik van riel | 21 | 11.35% | 2 | 14.29% |
andrea arcangeli | andrea arcangeli | 9 | 4.86% | 1 | 7.14% |
sasha levin | sasha levin | 3 | 1.62% | 1 | 7.14% |
jianyu zhan | jianyu zhan | 1 | 0.54% | 1 | 7.14% |
andrew morton | andrew morton | 1 | 0.54% | 1 | 7.14% |
| Total | 185 | 100.00% | 14 | 100.00% |
/**
* page_add_new_anon_rmap - add pte mapping to a new anonymous page
* @page: the page to add the mapping to
* @vma: the vm area in which the mapping is added
* @address: the user virtual address mapped
* @compound: charge the page as compound or small page
*
* Same as page_add_anon_rmap but must only be called on *new* pages.
* This means the inc-and-test can be bypassed.
* Page does not have to be locked.
*/
void page_add_new_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address, bool compound)
{
int nr = compound ? hpage_nr_pages(page) : 1;
VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma);
__SetPageSwapBacked(page);
if (compound) {
VM_BUG_ON_PAGE(!PageTransHuge(page), page);
/* increment count (starts at -1) */
atomic_set(compound_mapcount_ptr(page), 0);
__inc_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
} else {
/* Anon THP always mapped first with PMD */
VM_BUG_ON_PAGE(PageTransCompound(page), page);
/* increment count (starts at -1) */
atomic_set(&page->_mapcount, 0);
}
__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
__page_set_anon_rmap(page, vma, address, 1);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 70 | 50.36% | 3 | 27.27% |
nick piggin | nick piggin | 42 | 30.22% | 2 | 18.18% |
andrea arcangeli | andrea arcangeli | 11 | 7.91% | 1 | 9.09% |
hugh dickins | hugh dickins | 11 | 7.91% | 3 | 27.27% |
sasha levin | sasha levin | 3 | 2.16% | 1 | 9.09% |
rik van riel | rik van riel | 2 | 1.44% | 1 | 9.09% |
| Total | 139 | 100.00% | 11 | 100.00% |
/**
* page_add_file_rmap - add pte mapping to a file page
* @page: the page to add the mapping to
*
* The caller needs to hold the pte lock.
*/
void page_add_file_rmap(struct page *page)
{
lock_page_memcg(page);
if (atomic_inc_and_test(&page->_mapcount)) {
__inc_zone_page_state(page, NR_FILE_MAPPED);
mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
}
unlock_page_memcg(page);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
andrew morton | andrew morton | 18 | 39.13% | 4 | 33.33% |
kamezawa hiroyuki | kamezawa hiroyuki | 7 | 15.22% | 1 | 8.33% |
balbir singh | balbir singh | 6 | 13.04% | 1 | 8.33% |
hugh dickins | hugh dickins | 5 | 10.87% | 1 | 8.33% |
johannes weiner | johannes weiner | 4 | 8.70% | 2 | 16.67% |
christoph lameter | christoph lameter | 4 | 8.70% | 1 | 8.33% |
sha zhengju | sha zhengju | 1 | 2.17% | 1 | 8.33% |
greg thelen | greg thelen | 1 | 2.17% | 1 | 8.33% |
| Total | 46 | 100.00% | 12 | 100.00% |
static void page_remove_file_rmap(struct page *page)
{
lock_page_memcg(page);
/* Hugepages are not counted in NR_FILE_MAPPED for now. */
if (unlikely(PageHuge(page))) {
/* hugetlb pages are always mapped with pmds */
atomic_dec(compound_mapcount_ptr(page));
goto out;
}
/* page still mapped by someone else? */
if (!atomic_add_negative(-1, &page->_mapcount))
goto out;
/*
* We use the irq-unsafe __{inc|mod}_zone_page_stat because
* these counters are not modified in interrupt context, and
* pte lock(a spinlock) is held, which implies preemption disabled.
*/
__dec_zone_page_state(page, NR_FILE_MAPPED);
mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
if (unlikely(PageMlocked(page)))
clear_page_mlock(page);
out:
unlock_page_memcg(page);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
johannes weiner | johannes weiner | 41 | 42.71% | 3 | 33.33% |
kirill a. shutemov | kirill a. shutemov | 25 | 26.04% | 1 | 11.11% |
andrew morton | andrew morton | 12 | 12.50% | 2 | 22.22% |
kamezawa hiroyuki | kamezawa hiroyuki | 10 | 10.42% | 1 | 11.11% |
naoya horiguchi | naoya horiguchi | 6 | 6.25% | 1 | 11.11% |
hugh dickins | hugh dickins | 2 | 2.08% | 1 | 11.11% |
| Total | 96 | 100.00% | 9 | 100.00% |
static void page_remove_anon_compound_rmap(struct page *page)
{
int i, nr;
if (!atomic_add_negative(-1, compound_mapcount_ptr(page)))
return;
/* Hugepages are not counted in NR_ANON_PAGES for now. */
if (unlikely(PageHuge(page)))
return;
if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
return;
__dec_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
if (TestClearPageDoubleMap(page)) {
/*
* Subpages can be mapped with PTEs too. Check how many of
* themi are still mapped.
*/
for (i = 0, nr = 0; i < HPAGE_PMD_NR; i++) {
if (atomic_add_negative(-1, &page[i]._mapcount))
nr++;
}
} else {
nr = HPAGE_PMD_NR;
}
if (unlikely(PageMlocked(page)))
clear_page_mlock(page);
if (nr) {
__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, -nr);
deferred_split_huge_page(page);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 116 | 75.82% | 4 | 66.67% |
johannes weiner | johannes weiner | 34 | 22.22% | 1 | 16.67% |
kamezawa hiroyuki | kamezawa hiroyuki | 3 | 1.96% | 1 | 16.67% |
| Total | 153 | 100.00% | 6 | 100.00% |
/**
* page_remove_rmap - take down pte mapping from a page
* @page: page to remove mapping from
* @compound: uncharge the page as compound or small page
*
* The caller needs to hold the pte lock.
*/
void page_remove_rmap(struct page *page, bool compound)
{
if (!PageAnon(page)) {
VM_BUG_ON_PAGE(compound && !PageHuge(page), page);
page_remove_file_rmap(page);
return;
}
if (compound)
return page_remove_anon_compound_rmap(page);
/* page still mapped by someone else? */
if (!atomic_add_negative(-1, &page->_mapcount))
return;
/*
* We use the irq-unsafe __{inc|mod}_zone_page_stat because
* these counters are not modified in interrupt context, and
* pte lock(a spinlock) is held, which implies preemption disabled.
*/
__dec_zone_page_state(page, NR_ANON_PAGES);
if (unlikely(PageMlocked(page)))
clear_page_mlock(page);
if (PageTransCompound(page))
deferred_split_huge_page(compound_head(page));
/*
* It would be tidy to reset the PageAnon mapping here,
* but that might overwrite a racing page_add_anon_rmap
* which increments mapcount after us but sets mapping
* before us: so leave the reset to free_hot_cold_page,
* and remember that it's only reliable while mapped.
* Leaving it set also helps swapoff to reinstate ptes
* faster for those pages still in swapcache.
*/
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 76 | 71.03% | 4 | 40.00% |
hugh dickins | hugh dickins | 15 | 14.02% | 1 | 10.00% |
andrea arcangeli | andrea arcangeli | 10 | 9.35% | 1 | 10.00% |
kosaki motohiro | kosaki motohiro | 3 | 2.80% | 1 | 10.00% |
andrew morton | andrew morton | 2 | 1.87% | 2 | 20.00% |
christoph lameter | christoph lameter | 1 | 0.93% | 1 | 10.00% |
| Total | 107 | 100.00% | 10 | 100.00% |
struct rmap_private {
enum ttu_flags flags;
int lazyfreed;
};
/*
* @arg: enum ttu_flags will be passed to this argument
*/
static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
unsigned long address, void *arg)
{
struct mm_struct *mm = vma->vm_mm;
pte_t *pte;
pte_t pteval;
spinlock_t *ptl;
int ret = SWAP_AGAIN;
struct rmap_private *rp = arg;
enum ttu_flags flags = rp->flags;
/* munlock has nothing to gain from examining un-locked vmas */
if ((flags & TTU_MUNLOCK) && !(vma->vm_flags & VM_LOCKED))
goto out;
if (flags & TTU_SPLIT_HUGE_PMD) {
split_huge_pmd_address(vma, address,
flags & TTU_MIGRATION, page);
/* check if we have anything to do after split */
if (page_mapcount(page) == 0)
goto out;
}
pte = page_check_address(page, mm, address, &ptl,
PageTransCompound(page));
if (!pte)
goto out;
/*
* If the page is mlock()d, we cannot swap it out.
* If it's recently referenced (perhaps page_referenced
* skipped over this mm) then we should reactivate it.
*/
if (!(flags & TTU_IGNORE_MLOCK)) {
if (vma->vm_flags & VM_LOCKED) {
/* Holding pte lock, we do *not* need mmap_sem here */
mlock_vma_page(page);
ret = SWAP_MLOCK;
goto out_unmap;
}
if (flags & TTU_MUNLOCK)
goto out_unmap;
}
if (!(flags & TTU_IGNORE_ACCESS)) {
if (ptep_clear_flush_young_notify(vma, address, pte)) {
ret = SWAP_FAIL;
goto out_unmap;
}
}
/* Nuke the page table entry. */
flush_cache_page(vma, address, page_to_pfn(page));
if (should_defer_flush(mm, flags)) {
/*
* We clear the PTE but do not flush so potentially a remote
* CPU could still be writing to the page. If the entry was
* previously clean then the architecture must guarantee that
* a clear->dirty transition on a cached TLB entry is written
* through and traps if the PTE is unmapped.
*/
pteval = ptep_get_and_clear(mm, address, pte);
set_tlb_ubc_flush_pending(mm, page, pte_dirty(pteval));
} else {
pteval = ptep_clear_flush(vma, address, pte);
}
/* Move the dirty bit to the physical page now the pte is gone. */
if (pte_dirty(pteval))
set_page_dirty(page);
/* Update high watermark before we lower rss */
update_hiwater_rss(mm);
if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) {
if (PageHuge(page)) {
hugetlb_count_sub(1 << compound_order(page), mm);
} else {
dec_mm_counter(mm, mm_counter(page));
}
set_pte_at(mm, address, pte,
swp_entry_to_pte(make_hwpoison_entry(page)));
} else if (pte_unused(pteval)) {
/*
* The guest indicated that the page content is of no
* interest anymore. Simply discard the pte, vmscan
* will take care of the rest.
*/
dec_mm_counter(mm, mm_counter(page));
} else if (IS_ENABLED(CONFIG_MIGRATION) && (flags & TTU_MIGRATION)) {
swp_entry_t entry;
pte_t swp_pte;
/*
* Store the pfn of the page in a special migration
* pte. do_swap_page() will wait until the migration
* pte is removed and then restart fault handling.
*/
entry = make_migration_entry(page, pte_write(pteval));
swp_pte = swp_entry_to_pte(entry);
if (pte_soft_dirty(pteval))
swp_pte = pte_swp_mksoft_dirty(swp_pte);
set_pte_at(mm, address, pte, swp_pte);
} else if (PageAnon(page)) {
swp_entry_t entry = { .val = page_private(page) };
pte_t swp_pte;
/*
* Store the swap location in the pte.
* See handle_pte_fault() ...
*/
VM_BUG_ON_PAGE(!PageSwapCache(page), page);
if (!PageDirty(page) && (flags & TTU_LZFREE)) {
/* It's a freeable page by MADV_FREE */
dec_mm_counter(mm, MM_ANONPAGES);
rp->lazyfreed++;
goto discard;
}
if (swap_duplicate(entry) < 0) {
set_pte_at(mm, address, pte, pteval);
ret = SWAP_FAIL;
goto out_unmap;
}
if (list_empty(&mm->mmlist)) {
spin_lock(&mmlist_lock);
if (list_empty(&mm->mmlist))
list_add(&mm->mmlist, &init_mm.mmlist);
spin_unlock(&mmlist_lock);
}
dec_mm_counter(mm, MM_ANONPAGES);
inc_mm_counter(mm, MM_SWAPENTS);
swp_pte = swp_entry_to_pte(entry);
if (pte_soft_dirty(pteval))
swp_pte = pte_swp_mksoft_dirty(swp_pte);
set_pte_at(mm, address, pte, swp_pte);
} else
dec_mm_counter(mm, mm_counter_file(page));
discard:
page_remove_rmap(page, PageHuge(page));
put_page(page);
out_unmap:
pte_unmap_unlock(pte, ptl);
if (ret != SWAP_FAIL && ret != SWAP_MLOCK && !(flags & TTU_MUNLOCK))
mmu_notifier_invalidate_page(mm, address);
out:
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
hugh dickins | hugh dickins | 225 | 31.47% | 14 | 26.92% |
andrew morton | andrew morton | 148 | 20.70% | 4 | 7.69% |
andi kleen | andi kleen | 59 | 8.25% | 2 | 3.85% |
minchan kim | minchan kim | 44 | 6.15% | 1 | 1.92% |
kirill a. shutemov | kirill a. shutemov | 41 | 5.73% | 5 | 9.62% |
mel gorman | mel gorman | 38 | 5.31% | 2 | 3.85% |
naoya horiguchi | naoya horiguchi | 26 | 3.64% | 3 | 5.77% |
cyrill gorcunov | cyrill gorcunov | 25 | 3.50% | 1 | 1.92% |
konstantin weitz | konstantin weitz | 18 | 2.52% | 1 | 1.92% |
sagi grimberg | sagi grimberg | 14 | 1.96% | 1 | 1.92% |
nick piggin | nick piggin | 11 | 1.54% | 2 | 3.85% |
christoph lameter | christoph lameter | 11 | 1.54% | 4 | 7.69% |
david s. miller | david s. miller | 10 | 1.40% | 2 | 3.85% |
jerome marchand | jerome marchand | 10 | 1.40% | 1 | 1.92% |
konstantin khlebnikov | konstantin khlebnikov | 8 | 1.12% | 2 | 3.85% |
joonsoo kim | joonsoo kim | 8 | 1.12% | 1 | 1.92% |
kamezawa hiroyuki | kamezawa hiroyuki | 8 | 1.12% | 2 | 3.85% |
nikita danilov | nikita danilov | 5 | 0.70% | 1 | 1.92% |
kosaki motohiro | kosaki motohiro | 4 | 0.56% | 1 | 1.92% |
bjorn steinbrink | bjorn steinbrink | 1 | 0.14% | 1 | 1.92% |
andrea arcangeli | andrea arcangeli | 1 | 0.14% | 1 | 1.92% |
| Total | 715 | 100.00% | 52 | 100.00% |
bool is_vma_temporary_stack(struct vm_area_struct *vma)
{
int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP);
if (!maybe_stack)
return false;
if ((vma->vm_flags & VM_STACK_INCOMPLETE_SETUP) ==
VM_STACK_INCOMPLETE_SETUP)
return true;
return false;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 22 | 44.90% | 1 | 25.00% |
andrew morton | andrew morton | 14 | 28.57% | 2 | 50.00% |
nick piggin | nick piggin | 13 | 26.53% | 1 | 25.00% |
| Total | 49 | 100.00% | 4 | 100.00% |
static bool invalid_migration_vma(struct vm_area_struct *vma, void *arg)
{
return is_vma_temporary_stack(vma);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 17 | 80.95% | 1 | 50.00% |
nick piggin | nick piggin | 4 | 19.05% | 1 | 50.00% |
| Total | 21 | 100.00% | 2 | 100.00% |
static int page_mapcount_is_zero(struct page *page)
{
return !page_mapcount(page);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 11 | 61.11% | 2 | 40.00% |
joonsoo kim | joonsoo kim | 5 | 27.78% | 1 | 20.00% |
andrew morton | andrew morton | 2 | 11.11% | 2 | 40.00% |
| Total | 18 | 100.00% | 5 | 100.00% |
/**
* try_to_unmap - try to remove all page table mappings to a page
* @page: the page to get unmapped
* @flags: action and flags
*
* Tries to remove all the page table entries which are mapping this
* page, used in the pageout path. Caller must hold the page lock.
* Return values are:
*
* SWAP_SUCCESS - we succeeded in removing all mappings
* SWAP_AGAIN - we missed a mapping, try again later
* SWAP_FAIL - the page is unswappable
* SWAP_MLOCK - page is mlocked.
*/
int try_to_unmap(struct page *page, enum ttu_flags flags)
{
int ret;
struct rmap_private rp = {
.flags = flags,
.lazyfreed = 0,
};
struct rmap_walk_control rwc = {
.rmap_one = try_to_unmap_one,
.arg = &rp,
.done = page_mapcount_is_zero,
.anon_lock = page_lock_anon_vma_read,
};
/*
* During exec, a temporary VMA is setup and later moved.
* The VMA is moved under the anon_vma lock but not the
* page tables leading to a race where migration cannot
* find the migration ptes. Rather than increasing the
* locking requirements of exec(), migration skips
* temporary VMAs until after exec() completes.
*/
if ((flags & TTU_MIGRATION) && !PageKsm(page) && PageAnon(page))
rwc.invalid_vma = invalid_migration_vma;
if (flags & TTU_RMAP_LOCKED)
ret = rmap_walk_locked(page, &rwc);
else
ret = rmap_walk(page, &rwc);
if (ret != SWAP_MLOCK && !page_mapcount(page)) {
ret = SWAP_SUCCESS;
if (rp.lazyfreed && !PageDirty(page))
ret = SWAP_LZFREE;
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
andrew morton | andrew morton | 40 | 26.67% | 4 | 30.77% |
joonsoo kim | joonsoo kim | 38 | 25.33% | 1 | 7.69% |
minchan kim | minchan kim | 36 | 24.00% | 1 | 7.69% |
kirill a. shutemov | kirill a. shutemov | 19 | 12.67% | 1 | 7.69% |
hugh dickins | hugh dickins | 4 | 2.67% | 1 | 7.69% |
nick piggin | nick piggin | 4 | 2.67% | 1 | 7.69% |
andi kleen | andi kleen | 3 | 2.00% | 1 | 7.69% |
rusty russell | rusty russell | 2 | 1.33% | 1 | 7.69% |
christoph lameter | christoph lameter | 2 | 1.33% | 1 | 7.69% |
konstantin khlebnikov | konstantin khlebnikov | 2 | 1.33% | 1 | 7.69% |
| Total | 150 | 100.00% | 13 | 100.00% |
static int page_not_mapped(struct page *page)
{
return !page_mapped(page);
}Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 18 | 100.00% | 1 | 100.00% |
| Total | 18 | 100.00% | 1 | 100.00% |
;
/**
* try_to_munlock - try to munlock a page
* @page: the page to be munlocked
*
* Called from munlock code. Checks all of the VMAs mapping the page
* to make sure nobody else has this page mlocked. The page will be
* returned with PG_mlocked cleared if no other vmas have it mlocked.
*
* Return values are:
*
* SWAP_AGAIN - no vma is holding page mlocked, or,
* SWAP_AGAIN - page mapped in mlocked vma -- couldn't acquire mmap sem
* SWAP_FAIL - page cannot be located at present
* SWAP_MLOCK - page is now mlocked.
*/
int try_to_munlock(struct page *page)
{
int ret;
struct rmap_private rp = {
.flags = TTU_MUNLOCK,
.lazyfreed = 0,
};
struct rmap_walk_control rwc = {
.rmap_one = try_to_unmap_one,
.arg = &rp,
.done = page_not_mapped,
.anon_lock = page_lock_anon_vma_read,
};
VM_BUG_ON_PAGE(!PageLocked(page) || PageLRU(page), page);
ret = rmap_walk(page, &rwc);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
joonsoo kim | joonsoo kim | 35 | 41.18% | 1 | 25.00% |
nick piggin | nick piggin | 29 | 34.12% | 1 | 25.00% |
minchan kim | minchan kim | 18 | 21.18% | 1 | 25.00% |
sasha levin | sasha levin | 3 | 3.53% | 1 | 25.00% |
| Total | 85 | 100.00% | 4 | 100.00% |
void __put_anon_vma(struct anon_vma *anon_vma)
{
struct anon_vma *root = anon_vma->root;
anon_vma_free(anon_vma);
if (root != anon_vma && atomic_dec_and_test(&root->refcount))
anon_vma_free(root);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
rik van riel | rik van riel | 32 | 74.42% | 1 | 25.00% |
peter zijlstra | peter zijlstra | 6 | 13.95% | 2 | 50.00% |
andrey ryabinin | andrey ryabinin | 5 | 11.63% | 1 | 25.00% |
| Total | 43 | 100.00% | 4 | 100.00% |
static struct anon_vma *rmap_walk_anon_lock(struct page *page,
struct rmap_walk_control *rwc)
{
struct anon_vma *anon_vma;
if (rwc->anon_lock)
return rwc->anon_lock(page);
/*
* Note: remove_migration_ptes() cannot use page_lock_anon_vma_read()
* because that depends on page_mapped(); but not all its usages
* are holding mmap_sem. Users without mmap_sem are required to
* take a reference count to prevent the anon_vma disappearing
*/
anon_vma = page_anon_vma(page);
if (!anon_vma)
return NULL;
anon_vma_lock_read(anon_vma);
return anon_vma;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
joonsoo kim | joonsoo kim | 61 | 100.00% | 2 | 100.00% |
| Total | 61 | 100.00% | 2 | 100.00% |
/*
* rmap_walk_anon - do something to anonymous page using the object-based
* rmap method
* @page: the page to be handled
* @rwc: control variable according to each walk type
*
* Find all the mappings of a page using the mapping pointer and the vma chains
* contained in the anon_vma struct it points to.
*
* When called from try_to_munlock(), the mmap_sem of the mm containing the vma
* where the page was found will be held for write. So, we won't recheck
* vm_flags for that VMA. That should be OK, because that vma shouldn't be
* LOCKED.
*/
static int rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc,
bool locked)
{
struct anon_vma *anon_vma;
pgoff_t pgoff;
struct anon_vma_chain *avc;
int ret = SWAP_AGAIN;
if (locked) {
anon_vma = page_anon_vma(page);
/* anon_vma disappear under us? */
VM_BUG_ON_PAGE(!anon_vma, page);
} else {
anon_vma = rmap_walk_anon_lock(page, rwc);
}
if (!anon_vma)
return ret;
pgoff = page_to_pgoff(page);
anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root, pgoff, pgoff) {
struct vm_area_struct *vma = avc->vma;
unsigned long address = vma_address(page, vma);
cond_resched();
if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg))
continue;
ret = rwc->rmap_one(page, vma, address, rwc->arg);
if (ret != SWAP_AGAIN)
break;
if (rwc->done && rwc->done(page))
break;
}
if (!locked)
anon_vma_unlock_read(anon_vma);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
hugh dickins | hugh dickins | 85 | 44.74% | 1 | 10.00% |
joonsoo kim | joonsoo kim | 41 | 21.58% | 3 | 30.00% |
kirill a. shutemov | kirill a. shutemov | 33 | 17.37% | 1 | 10.00% |
rik van riel | rik van riel | 12 | 6.32% | 1 | 10.00% |
michel lespinasse | michel lespinasse | 8 | 4.21% | 1 | 10.00% |
davidlohr bueso | davidlohr bueso | 7 | 3.68% | 1 | 10.00% |
andrea arcangeli | andrea arcangeli | 3 | 1.58% | 1 | 10.00% |
ingo molnar | ingo molnar | 1 | 0.53% | 1 | 10.00% |
| Total | 190 | 100.00% | 10 | 100.00% |
/*
* rmap_walk_file - do something to file page using the object-based rmap method
* @page: the page to be handled
* @rwc: control variable according to each walk type
*
* Find all the mappings of a page using the mapping pointer and the vma chains
* contained in the address_space struct it points to.
*
* When called from try_to_munlock(), the mmap_sem of the mm containing the vma
* where the page was found will be held for write. So, we won't recheck
* vm_flags for that VMA. That should be OK, because that vma shouldn't be
* LOCKED.
*/
static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc,
bool locked)
{
struct address_space *mapping = page_mapping(page);
pgoff_t pgoff;
struct vm_area_struct *vma;
int ret = SWAP_AGAIN;
/*
* The page lock not only makes sure that page->mapping cannot
* suddenly be NULLified by truncation, it makes sure that the
* structure at mapping cannot be freed and reused yet,
* so we can safely take mapping->i_mmap_rwsem.
*/
VM_BUG_ON_PAGE(!PageLocked(page), page);
if (!mapping)
return ret;
pgoff = page_to_pgoff(page);
if (!locked)
i_mmap_lock_read(mapping);
vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
unsigned long address = vma_address(page, vma);
cond_resched();
if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg))
continue;
ret = rwc->rmap_one(page, vma, address, rwc->arg);
if (ret != SWAP_AGAIN)
goto done;
if (rwc->done && rwc->done(page))
goto done;
}
done:
if (!locked)
i_mmap_unlock_read(mapping);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
hugh dickins | hugh dickins | 94 | 52.22% | 1 | 9.09% |
joonsoo kim | joonsoo kim | 53 | 29.44% | 3 | 27.27% |
kirill a. shutemov | kirill a. shutemov | 16 | 8.89% | 1 | 9.09% |
davidlohr bueso | davidlohr bueso | 10 | 5.56% | 3 | 27.27% |
andrea arcangeli | andrea arcangeli | 3 | 1.67% | 1 | 9.09% |
sasha levin | sasha levin | 3 | 1.67% | 1 | 9.09% |
michel lespinasse | michel lespinasse | 1 | 0.56% | 1 | 9.09% |
| Total | 180 | 100.00% | 11 | 100.00% |
int rmap_walk(struct page *page, struct rmap_walk_control *rwc)
{
if (unlikely(PageKsm(page)))
return rmap_walk_ksm(page, rwc);
else if (PageAnon(page))
return rmap_walk_anon(page, rwc, false);
else
return rmap_walk_file(page, rwc, false);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
hugh dickins | hugh dickins | 42 | 67.74% | 1 | 33.33% |
kirill a. shutemov | kirill a. shutemov | 16 | 25.81% | 1 | 33.33% |
joonsoo kim | joonsoo kim | 4 | 6.45% | 1 | 33.33% |
| Total | 62 | 100.00% | 3 | 100.00% |
/* Like rmap_walk, but caller holds relevant rmap lock */
int rmap_walk_locked(struct page *page, struct rmap_walk_control *rwc)
{
/* no ksm support for now */
VM_BUG_ON_PAGE(PageKsm(page), page);
if (PageAnon(page))
return rmap_walk_anon(page, rwc, true);
else
return rmap_walk_file(page, rwc, true);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 42 | 77.78% | 1 | 33.33% |
hugh dickins | hugh dickins | 11 | 20.37% | 1 | 33.33% |
joonsoo kim | joonsoo kim | 1 | 1.85% | 1 | 33.33% |
| Total | 54 | 100.00% | 3 | 100.00% |
#ifdef CONFIG_HUGETLB_PAGE
/*
* The following three functions are for anonymous (private mapped) hugepages.
* Unlike common anonymous pages, anonymous hugepages have no accounting code
* and no lru code, because we handle hugepages differently from common pages.
*/
static void __hugepage_set_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address, int exclusive)
{
struct anon_vma *anon_vma = vma->anon_vma;
BUG_ON(!anon_vma);
if (PageAnon(page))
return;
if (!exclusive)
anon_vma = anon_vma->root;
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
page->mapping = (struct address_space *) anon_vma;
page->index = linear_page_index(vma, address);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
naoya horiguchi | naoya horiguchi | 89 | 100.00% | 2 | 100.00% |
| Total | 89 | 100.00% | 2 | 100.00% |
void hugepage_add_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
struct anon_vma *anon_vma = vma->anon_vma;
int first;
BUG_ON(!PageLocked(page));
BUG_ON(!anon_vma);
/* address might be in next vma when migration races vma_adjust */
first = atomic_inc_and_test(compound_mapcount_ptr(page));
if (first)
__hugepage_set_anon_rmap(page, vma, address, 0);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
naoya horiguchi | naoya horiguchi | 68 | 94.44% | 2 | 50.00% |
kirill a. shutemov | kirill a. shutemov | 3 | 4.17% | 1 | 25.00% |
hugh dickins | hugh dickins | 1 | 1.39% | 1 | 25.00% |
| Total | 72 | 100.00% | 4 | 100.00% |
void hugepage_add_new_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
BUG_ON(address < vma->vm_start || address >= vma->vm_end);
atomic_set(compound_mapcount_ptr(page), 0);
__hugepage_set_anon_rmap(page, vma, address, 1);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
naoya horiguchi | naoya horiguchi | 52 | 94.55% | 1 | 50.00% |
kirill a. shutemov | kirill a. shutemov | 3 | 5.45% | 1 | 50.00% |
| Total | 55 | 100.00% | 2 | 100.00% |
#endif /* CONFIG_HUGETLB_PAGE */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kirill a. shutemov | kirill a. shutemov | 909 | 14.02% | 16 | 7.92% |
hugh dickins | hugh dickins | 908 | 14.00% | 36 | 17.82% |
andrew morton | andrew morton | 657 | 10.13% | 17 | 8.42% |
peter zijlstra | peter zijlstra | 563 | 8.68% | 8 | 3.96% |
joonsoo kim | joonsoo kim | 501 | 7.73% | 7 | 3.47% |
rik van riel | rik van riel | 414 | 6.38% | 7 | 3.47% |
mel gorman | mel gorman | 335 | 5.17% | 3 | 1.49% |
nick piggin | nick piggin | 301 | 4.64% | 6 | 2.97% |
naoya horiguchi | naoya horiguchi | 282 | 4.35% | 8 | 3.96% |
vladimir davydov | vladimir davydov | 246 | 3.79% | 4 | 1.98% |
linus torvalds | linus torvalds | 182 | 2.81% | 5 | 2.48% |
andrea arcangeli | andrea arcangeli | 137 | 2.11% | 8 | 3.96% |
konstantin khlebnikov | konstantin khlebnikov | 133 | 2.05% | 5 | 2.48% |
minchan kim | minchan kim | 110 | 1.70% | 1 | 0.50% |
bob liu | bob liu | 98 | 1.51% | 1 | 0.50% |
johannes weiner | johannes weiner | 85 | 1.31% | 5 | 2.48% |
andi kleen | andi kleen | 70 | 1.08% | 3 | 1.49% |
michel lespinasse | michel lespinasse | 66 | 1.02% | 3 | 1.49% |
kautuk consul | kautuk consul | 56 | 0.86% | 1 | 0.50% |
nikita danilov | nikita danilov | 48 | 0.74% | 1 | 0.50% |
adrian bunk | adrian bunk | 36 | 0.56% | 1 | 0.50% |
kamezawa hiroyuki | kamezawa hiroyuki | 28 | 0.43% | 4 | 1.98% |
ingo molnar | ingo molnar | 27 | 0.42% | 2 | 0.99% |
sagi grimberg | sagi grimberg | 26 | 0.40% | 1 | 0.50% |
cyrill gorcunov | cyrill gorcunov | 25 | 0.39% | 1 | 0.50% |
oleg nesterov | oleg nesterov | 23 | 0.35% | 2 | 0.99% |
christoph lameter | christoph lameter | 23 | 0.35% | 6 | 2.97% |
sasha levin | sasha levin | 18 | 0.28% | 2 | 0.99% |
nadav amit | nadav amit | 18 | 0.28% | 1 | 0.50% |
konstantin weitz | konstantin weitz | 18 | 0.28% | 1 | 0.50% |
balbir singh | balbir singh | 17 | 0.26% | 3 | 1.49% |
davidlohr bueso | davidlohr bueso | 17 | 0.26% | 3 | 1.49% |
fengguang wu | fengguang wu | 15 | 0.23% | 2 | 0.99% |
jerome marchand | jerome marchand | 10 | 0.15% | 1 | 0.50% |
david s. miller | david s. miller | 10 | 0.15% | 2 | 0.99% |
daniel forrest | daniel forrest | 10 | 0.15% | 1 | 0.50% |
kosaki motohiro | kosaki motohiro | 10 | 0.15% | 3 | 1.49% |
jianguo wu | jianguo wu | 9 | 0.14% | 1 | 0.50% |
leon yu | leon yu | 7 | 0.11% | 1 | 0.50% |
jaya kumar | jaya kumar | 5 | 0.08% | 1 | 0.50% |
andrey ryabinin | andrey ryabinin | 5 | 0.08% | 1 | 0.50% |
christoph hellwig | christoph hellwig | 3 | 0.05% | 1 | 0.50% |
jan kara | jan kara | 3 | 0.05% | 1 | 0.50% |
jason low | jason low | 3 | 0.05% | 1 | 0.50% |
christian borntraeger | christian borntraeger | 3 | 0.05% | 1 | 0.50% |
rusty russell | rusty russell | 2 | 0.03% | 1 | 0.50% |
namhyung kim | namhyung kim | 2 | 0.03% | 2 | 0.99% |
pekka j enberg | pekka j enberg | 2 | 0.03% | 1 | 0.50% |
randy dunlap | randy dunlap | 1 | 0.02% | 1 | 0.50% |
david rientjes | david rientjes | 1 | 0.02% | 1 | 0.50% |
jianyu zhan | jianyu zhan | 1 | 0.02% | 1 | 0.50% |
bjorn steinbrink | bjorn steinbrink | 1 | 0.02% | 1 | 0.50% |
aneesh kumar | aneesh kumar | 1 | 0.02% | 1 | 0.50% |
greg thelen | greg thelen | 1 | 0.02% | 1 | 0.50% |
al viro | al viro | 1 | 0.02% | 1 | 0.50% |
paul gortmaker | paul gortmaker | 1 | 0.02% | 1 | 0.50% |
sha zhengju | sha zhengju | 1 | 0.02% | 1 | 0.50% |
| Total | 6485 | 100.00% | 202 | 100.00% |
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