cregit-Linux how code gets into the kernel

Release 4.15 mm/rmap.c

Directory: mm
/*
 * 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/sched/mm.h>
#include <linux/sched/task.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 <linux/memremap.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

PersonTokensPropCommitsCommitProp
Peter Zijlstra3351.56%133.33%
Adrian Bunk1828.12%133.33%
Konstantin Khlebnikov1320.31%133.33%
Total64100.00%3100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Peter Zijlstra3356.90%228.57%
Adrian Bunk1729.31%114.29%
Ingo Molnar46.90%228.57%
Hugh Dickins35.17%114.29%
Konstantin Khlebnikov11.72%114.29%
Total58100.00%7100.00%


static inline struct anon_vma_chain *anon_vma_chain_alloc(gfp_t gfp) { return kmem_cache_alloc(anon_vma_chain_cachep, gfp); }

Contributors

PersonTokensPropCommitsCommitProp
Rik Van Riel1785.00%150.00%
Linus Torvalds315.00%150.00%
Total20100.00%2100.00%


static void anon_vma_chain_free(struct anon_vma_chain *anon_vma_chain) { kmem_cache_free(anon_vma_chain_cachep, anon_vma_chain); }

Contributors

PersonTokensPropCommitsCommitProp
Rik Van Riel1794.44%150.00%
Namhyung Kim15.56%150.00%
Total18100.00%2100.00%


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

PersonTokensPropCommitsCommitProp
Kautuk Consul5496.43%150.00%
Michel Lespinasse23.57%150.00%
Total56100.00%2100.00%

/** * __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, which * is handled inline by anon_vma_prepare(). 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 mm_struct *mm = vma->vm_mm; struct anon_vma *anon_vma, *allocated; struct anon_vma_chain *avc; might_sleep(); 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

PersonTokensPropCommitsCommitProp
Andrew Morton10151.53%215.38%
Rik Van Riel3919.90%17.69%
Linus Torvalds126.12%215.38%
Vlastimil Babka115.61%17.69%
Hugh Dickins115.61%17.69%
Oleg Nesterov115.61%17.69%
Konstantin Khlebnikov73.57%215.38%
Kautuk Consul21.02%17.69%
Peter Zijlstra10.51%17.69%
Ingo Molnar10.51%17.69%
Total196100.00%13100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Linus Torvalds6293.94%150.00%
Ingo Molnar46.06%150.00%
Total66100.00%2100.00%


static inline void unlock_anon_vma_root(struct anon_vma *root) { if (root) up_write(&root->rwsem); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2291.67%150.00%
Ingo Molnar28.33%150.00%
Total24100.00%2100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Linus Torvalds6436.16%342.86%
Rik Van Riel5028.25%114.29%
Konstantin Khlebnikov3922.03%114.29%
Andrew Morton179.60%114.29%
Leon Yu73.95%114.29%
Total177100.00%7100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Rik Van Riel10054.64%433.33%
Konstantin Khlebnikov3318.03%216.67%
Andrew Morton2614.21%18.33%
Linus Torvalds116.01%216.67%
Daniel Forrest105.46%18.33%
Peter Zijlstra21.09%18.33%
Ingo Molnar10.55%18.33%
Total183100.00%12100.00%


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.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

PersonTokensPropCommitsCommitProp
Peter Zijlstra6538.92%111.11%
Andrew Morton3319.76%111.11%
Rik Van Riel3017.96%222.22%
Konstantin Khlebnikov2917.37%222.22%
Michel Lespinasse74.19%111.11%
Davidlohr Bueso A21.20%111.11%
Ingo Molnar10.60%111.11%
Total167100.00%9100.00%


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_CACHED; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton2356.10%114.29%
Peter Zijlstra614.63%114.29%
Mel Gorman49.76%114.29%
Christoph Lameter37.32%114.29%
Ingo Molnar24.88%114.29%
Michel Lespinasse24.88%114.29%
Davidlohr Bueso A12.44%114.29%
Total41100.00%7100.00%


void __init anon_vma_init(void) { anon_vma_cachep = kmem_cache_create("anon_vma", sizeof(struct anon_vma), 0, SLAB_TYPESAFE_BY_RCU|SLAB_PANIC|SLAB_ACCOUNT, anon_vma_ctor); anon_vma_chain_cachep = KMEM_CACHE(anon_vma_chain, SLAB_PANIC|SLAB_ACCOUNT); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton2764.29%120.00%
Rik Van Riel921.43%120.00%
Vladimir Davydov49.52%120.00%
Paul E. McKenney12.38%120.00%
Hugh Dickins12.38%120.00%
Total42100.00%5100.00%

/* * 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_TYPESAFE_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

PersonTokensPropCommitsCommitProp
Hugh Dickins9776.98%562.50%
Peter Zijlstra2721.43%112.50%
Jason Low10.79%112.50%
Paul E. McKenney10.79%112.50%
Total126100.00%8100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Peter Zijlstra18183.41%333.33%
Hugh Dickins2611.98%333.33%
Ingo Molnar83.69%222.22%
Jason Low20.92%111.11%
Total217100.00%9100.00%


void page_unlock_anon_vma_read(struct anon_vma *anon_vma) { anon_vma_unlock_read(anon_vma); }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov1386.67%150.00%
Ingo Molnar213.33%150.00%
Total15100.00%2100.00%

#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 = &current->tlb_ubc; if (!tlb_ubc->flush_required) return; arch_tlbbatch_flush(&tlb_ubc->arch); tlb_ubc->flush_required = false; tlb_ubc->writable = false; }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman4395.56%266.67%
Andrew Lutomirski24.44%133.33%
Total45100.00%3100.00%

/* 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 = &current->tlb_ubc; if (tlb_ubc->writable) try_to_unmap_flush(); }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman26100.00%1100.00%
Total26100.00%1100.00%


static void set_tlb_ubc_flush_pending(struct mm_struct *mm, bool writable) { struct tlbflush_unmap_batch *tlb_ubc = &current->tlb_ubc; arch_tlbbatch_add_mm(&tlb_ubc->arch, mm); tlb_ubc->flush_required = true; /* * Ensure compiler does not re-order the setting of tlb_flush_batched * before the PTE is cleared. */ barrier(); mm->tlb_flush_batched = 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

PersonTokensPropCommitsCommitProp
Mel Gorman5996.72%375.00%
Andrew Lutomirski23.28%125.00%
Total61100.00%4100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Mel Gorman58100.00%1100.00%
Total58100.00%1100.00%

/* * Reclaim unmaps pages under the PTL but do not flush the TLB prior to * releasing the PTL if TLB flushes are batched. It's possible for a parallel * operation such as mprotect or munmap to race between reclaim unmapping * the page and flushing the page. If this race occurs, it potentially allows * access to data via a stale TLB entry. Tracking all mm's that have TLB * batching in flight would be expensive during reclaim so instead track * whether TLB batching occurred in the past and if so then do a flush here * if required. This will cost one additional flush per reclaim cycle paid * by the first operation at risk such as mprotect and mumap. * * This must be called under the PTL so that an access to tlb_flush_batched * that is potentially a "reclaim vs mprotect/munmap/etc" race will synchronise * via the PTL. */
void flush_tlb_batched_pending(struct mm_struct *mm) { if (mm->tlb_flush_batched) { flush_tlb_mm(mm); /* * Do not allow the compiler to re-order the clearing of * tlb_flush_batched before the tlb is flushed. */ barrier(); mm->tlb_flush_batched = false; } }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman33100.00%1100.00%
Total33100.00%1100.00%

#else
static void set_tlb_ubc_flush_pending(struct mm_struct *mm, bool writable) { }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman13100.00%2100.00%
Total13100.00%2100.00%


static bool should_defer_flush(struct mm_struct *mm, enum ttu_flags flags) { return false; }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman18100.00%1100.00%
Total18100.00%1100.00%

#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

PersonTokensPropCommitsCommitProp
Hugh Dickins8463.64%360.00%
Michel Lespinasse3123.48%120.00%
Andrea Arcangeli1712.88%120.00%
Total132100.00%5100.00%


pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address) { pgd_t *pgd; p4d_t *p4d; pud_t *pud; pmd_t *pmd = NULL; pmd_t pmde; pgd = pgd_offset(mm, address); if (!pgd_present(*pgd)) goto out; p4d = p4d_offset(pgd, address); if (!p4d_present(*p4d)) goto out; pud = pud_offset(p4d, 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

PersonTokensPropCommitsCommitProp
Bob Liu9568.35%120.00%
Kirill A. Shutemov2618.71%120.00%
Hugh Dickins1410.07%120.00%
Christian Bornträger32.16%120.00%
Aneesh Kumar K.V10.72%120.00%
Total139100.00%5100.00%

struct page_referenced_arg { int mapcount; int referenced; unsigned long vm_flags; struct mem_cgroup *memcg; }; /* * arg: page_referenced_arg will be passed */
static bool page_referenced_one(struct page *page, struct vm_area_struct *vma, unsigned long address, void *arg) { struct page_referenced_arg *pra = arg; struct page_vma_mapped_walk pvmw = { .page = page, .vma = vma, .address = address, }; int referenced = 0; while (page_vma_mapped_walk(&pvmw)) { address = pvmw.address; if (vma->vm_flags & VM_LOCKED) { page_vma_mapped_walk_done(&pvmw); pra->vm_flags |= VM_LOCKED; return false; /* To break the loop */ } if (pvmw.pte) { if (ptep_clear_flush_young_notify(vma, address, pvmw.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++; } } else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { if (pmdp_clear_flush_young_notify(vma, address, pvmw.pmd)) referenced++; } else { /* unexpected pmd-mapped page? */ WARN_ON_ONCE(1); } pra->mapcount--; } if (referenced) clear_page_idle(page); if (test_and_clear_page_young(page)) referenced++; if (referenced) { pra->referenced++; pra->vm_flags |= vma->vm_flags; } if (!pra->mapcount) return false; /* To break the loop */ return true; }

Contributors

PersonTokensPropCommitsCommitProp
Vladimir Davydov9842.24%211.76%
Kirill A. Shutemov4519.40%15.88%
JoonSoo Kim3916.81%15.88%
Andrea Arcangeli177.33%211.76%
Andrew Morton135.60%423.53%
Hugh Dickins62.59%211.76%
Johannes Weiner52.16%15.88%
MinChan Kim41.72%15.88%
Balbir Singh31.29%15.88%
Fengguang Wu10.43%15.88%
David Rientjes10.43%15.88%
Total232100.00%17100.00%


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

PersonTokensPropCommitsCommitProp
JoonSoo Kim4387.76%125.00%
Andrew Morton612.24%375.00%
Total49100.00%4100.00%

/** * 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 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; } rmap_walk(page, &rwc); *vm_flags = pra.vm_flags; if (we_locked) unlock_page(page); return pra.referenced; }

Contributors

PersonTokensPropCommitsCommitProp
JoonSoo Kim7743.50%17.69%
Hugh Dickins5128.81%323.08%
Andrew Morton3117.51%538.46%
Fengguang Wu116.21%17.69%
Balbir Singh42.26%17.69%
Johannes Weiner21.13%17.69%
Kirill A. Shutemov10.56%17.69%
Total177100.00%13100.00%


static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma, unsigned long address, void *arg) { struct page_vma_mapped_walk pvmw = { .page = page, .vma = vma, .address = address, .flags = PVMW_SYNC, }; unsigned long start = address, end; int *cleaned = arg; /* * We have to assume the worse case ie pmd for invalidation. Note that * the page can not be free from this function. */ end = min(vma->vm_end, start + (PAGE_SIZE << compound_order(page))); mmu_notifier_invalidate_range_start(vma->vm_mm, start, end); while (page_vma_mapped_walk(&pvmw)) { unsigned long cstart; int ret = 0; cstart = address = pvmw.address; if (pvmw.pte) { pte_t entry; pte_t *pte = pvmw.pte; if (!pte_dirty(*pte) && !pte_write(*pte)) continue; 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(vma->vm_mm, address, pte, entry); ret = 1; } else { #ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE pmd_t *pmd = pvmw.pmd; pmd_t entry; if (!pmd_dirty(*pmd) && !pmd_write(*pmd)) continue; flush_cache_page(vma, address, page_to_pfn(page)); entry = pmdp_huge_clear_flush(vma, address, pmd); entry = pmd_wrprotect(entry); entry = pmd_mkclean(entry); set_pmd_at(vma->vm_mm, address, pmd, entry); cstart &= PMD_MASK; ret = 1; #else /* unexpected pmd-mapped page? */ WARN_ON_ONCE(1); #endif } /* * No need to call mmu_notifier_invalidate_range() as we are * downgrading page table protection not changing it to point * to a new page. * * See Documentation/vm/mmu_notifier.txt */ if (ret) (*cleaned)++; } mmu_notifier_invalidate_range_end(vma->vm_mm, start, end); return true; }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov14843.40%110.00%
Peter Zijlstra9728.45%220.00%
Jérôme Glisse6218.18%220.00%
JoonSoo Kim133.81%110.00%
Linus Torvalds102.93%110.00%
Sagi Grimberg51.47%110.00%
Hugh Dickins41.17%110.00%
MinChan Kim20.59%110.00%
Total341100.00%10100.00%


static bool invalid_mkclean_vma(struct vm_area_struct *vma, void *arg) { if (vma->vm_flags & VM_SHARED) return false; return true; }

Contributors

PersonTokensPropCommitsCommitProp
Peter Zijlstra1965.52%133.33%
JoonSoo Kim827.59%133.33%
Fengguang Wu26.90%133.33%
Total29100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
JoonSoo Kim4751.09%150.00%
Peter Zijlstra4548.91%150.00%
Total92100.00%2100.00%

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

PersonTokensPropCommitsCommitProp
Rik Van Riel5776.00%120.00%
Hugh Dickins79.33%120.00%
Sasha Levin68.00%240.00%
Vladimir Davydov56.67%120.00%
Total75100.00%5100.00%

/** * __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

PersonTokensPropCommitsCommitProp
Andrew Morton3336.67%538.46%
Nicholas Piggin1921.11%323.08%
Hugh Dickins1011.11%17.69%
Andrea Arcangeli88.89%17.69%
Rik Van Riel77.78%17.69%
Linus Torvalds77.78%17.69%
Andi Kleen66.67%17.69%
Total90100.00%13100.00%

/** * __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

PersonTokensPropCommitsCommitProp
Nicholas Piggin3866.67%133.33%
Andrea Arcangeli1628.07%133.33%
Kirill A. Shutemov35.26%133.33%
Total57100.00%3100.00%

/** * 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

PersonTokensPropCommitsCommitProp
Nicholas Piggin1848.65%133.33%
Rik Van Riel1232.43%133.33%
Kirill A. Shutemov718.92%133.33%
Total37100.00%3100.00%

/* * 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_node_page_state(page, NR_ANON_THPS); __mod_node_page_state(page_pgdat(page), NR_ANON_MAPPED, 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

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov8948.63%527.78%
Nicholas Piggin3016.39%211.11%
Hugh Dickins2513.66%211.11%
Rik Van Riel2111.48%211.11%
Andrea Arcangeli94.92%15.56%
Mel Gorman42.19%316.67%
Sasha Levin31.64%15.56%
Andrew Morton10.55%15.56%
Jianyu Zhan10.55%15.56%
Total183100.00%18100.00%

/** * 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_node_page_state(page, NR_ANON_THPS); } 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_node_page_state(page_pgdat(page), NR_ANON_MAPPED, nr); __page_set_anon_rmap(page, vma, address, 1); }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov6748.20%426.67%
Nicholas Piggin4230.22%213.33%
Andrea Arcangeli117.91%16.67%
Hugh Dickins107.19%320.00%
Mel Gorman42.88%320.00%
Sasha Levin32.16%16.67%
Rik Van Riel21.44%16.67%
Total139100.00%15100.00%

/** * 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, bool compound) { int i, nr = 1; VM_BUG_ON_PAGE(compound && !PageTransHuge(page), page); lock_page_memcg(page); if (compound && PageTransHuge(page)) { for (i = 0, nr = 0; i < HPAGE_PMD_NR; i++) { if (atomic_inc_and_test(&page[i]._mapcount)) nr++; } if (!atomic_inc_and_test(compound_mapcount_ptr(page))) goto out; VM_BUG_ON_PAGE(!PageSwapBacked(page), page); __inc_node_page_state(page, NR_SHMEM_PMDMAPPED); } else { if (PageTransCompound(page) && page_mapping(page)) { VM_WARN_ON_ONCE(!PageLocked(page)); SetPageDoubleMap(compound_head(page)); if (PageMlocked(page)) clear_page_mlock(compound_head(page)); } if (!atomic_inc_and_test(&page->_mapcount)) goto out; } __mod_lruvec_page_state(page, NR_FILE_MAPPED, nr); out: unlock_page_memcg(page); }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov15378.46%422.22%
Andrew Morton157.69%422.22%
Johannes Weiner84.10%527.78%
Kamezawa Hiroyuki73.59%15.56%
Balbir Singh52.56%15.56%
Hugh Dickins52.56%15.56%
Christoph Lameter10.51%15.56%
Mel Gorman10.51%15.56%
Total195100.00%18100.00%


static void page_remove_file_rmap(struct page *page, bool compound) { int i, nr = 1; VM_BUG_ON_PAGE(compound && !PageHead(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 (compound && PageTransHuge(page)) { for (i = 0, nr = 0; i < HPAGE_PMD_NR; i++) { if (atomic_add_negative(-1, &page[i]._mapcount)) nr++; } if (!atomic_add_negative(-1, compound_mapcount_ptr(page))) goto out; VM_BUG_ON_PAGE(!PageSwapBacked(page), page); __dec_node_page_state(page, NR_SHMEM_PMDMAPPED); } else { if (!atomic_add_negative(-1, &page->_mapcount)) goto out; } /* * We use the irq-unsafe __{inc|mod}_lruvec_page_state because * these counters are not modified in interrupt context, and * pte lock(a spinlock) is held, which implies preemption disabled. */ __mod_lruvec_page_state(page, NR_FILE_MAPPED, -nr); if (unlikely(PageMlocked(page))) clear_page_mlock(page); out: unlock_page_memcg(page); }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov13365.84%317.65%
Johannes Weiner3416.83%635.29%
Kamezawa Hiroyuki136.44%211.76%
Andrew Morton125.94%211.76%
Naoya Horiguchi62.97%15.88%
Hugh Dickins20.99%15.88%
Steve Capper10.50%15.88%
Mel Gorman10.50%15.88%
Total202100.00%17100.00%


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_node_page_state(page, NR_ANON_THPS); 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_node_page_state(page_pgdat(page), NR_ANON_MAPPED, -nr); deferred_split_huge_page(page); } }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov11273.20%545.45%
Johannes Weiner3422.22%19.09%
Mel Gorman42.61%327.27%
Andrea Arcangeli21.31%19.09%
Motohiro Kosaki10.65%19.09%
Total153100.00%11100.00%

/** * 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)) return page_remove_file_rmap(page, compound); 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_node_page_state(page, NR_ANON_MAPPED); 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_unref_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

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov6569.15%533.33%
Hugh Dickins1515.96%16.67%
Andrea Arcangeli55.32%16.67%
Mel Gorman33.19%320.00%
Andrew Morton22.13%213.33%
Johannes Weiner22.13%16.67%
Motohiro Kosaki11.06%16.67%
Christoph Lameter11.06%16.67%
Total94100.00%15100.00%

/* * @arg: enum ttu_flags will be passed to this argument */
static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma, unsigned long address, void *arg) { struct mm_struct *mm = vma->vm_mm; struct page_vma_mapped_walk pvmw = { .page = page, .vma = vma, .address = address, }; pte_t pteval; struct page *subpage; bool ret = true; unsigned long start = address, end; enum ttu_flags flags = (enum ttu_flags)arg; /* munlock has nothing to gain from examining un-locked vmas */ if ((flags & TTU_MUNLOCK) && !(vma->vm_flags & VM_LOCKED)) return true; if (IS_ENABLED(CONFIG_MIGRATION) && (flags & TTU_MIGRATION) && is_zone_device_page(page) && !is_device_private_page(page)) return true; if (flags & TTU_SPLIT_HUGE_PMD) { split_huge_pmd_address(vma, address, flags & TTU_SPLIT_FREEZE, page); } /* * We have to assume the worse case ie pmd for invalidation. Note that * the page can not be free in this function as call of try_to_unmap() * must hold a reference on the page. */ end = min(vma->vm_end, start + (PAGE_SIZE << compound_order(page))); mmu_notifier_invalidate_range_start(vma->vm_mm, start, end); while (page_vma_mapped_walk(&pvmw)) { #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION /* PMD-mapped THP migration entry */ if (!pvmw.pte && (flags & TTU_MIGRATION)) { VM_BUG_ON_PAGE(PageHuge(page) || !PageTransCompound(page), page); if (!PageAnon(page)) continue; set_pmd_migration_entry(&pvmw, page); continue; } #endif /* * 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) { /* PTE-mapped THP are never mlocked */ if (!PageTransCompound(page)) { /* * Holding pte lock, we do *not* need * mmap_sem here */ mlock_vma_page(page); } ret = false; page_vma_mapped_walk_done(&pvmw); break; } if (flags & TTU_MUNLOCK) continue; } /* Unexpected PMD-mapped THP? */ VM_BUG_ON_PAGE(!pvmw.pte, page); subpage = page - page_to_pfn(page) + pte_pfn(*pvmw.pte); address = pvmw.address; if (IS_ENABLED(CONFIG_MIGRATION) && (flags & TTU_MIGRATION) && is_zone_device_page(page)) { swp_entry_t entry; pte_t swp_pte; pteval = ptep_get_and_clear(mm, pvmw.address, pvmw.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, 0); swp_pte = swp_entry_to_pte(entry); if (pte_soft_dirty(pteval)) swp_pte = pte_swp_mksoft_dirty(swp_pte); set_pte_at(mm, pvmw.address, pvmw.pte, swp_pte); /* * No need to invalidate here it will synchronize on * against the special swap migration pte. */ goto discard; } if (!(flags & TTU_IGNORE_ACCESS)) { if (ptep_clear_flush_young_notify(vma, address, pvmw.pte)) { ret = false; page_vma_mapped_walk_done(&pvmw); break; } } /* Nuke the page table entry. */ flush_cache_page(vma, address, pte_pfn(*pvmw.pte)); 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, pvmw.pte); set_tlb_ubc_flush_pending(mm, pte_dirty(pteval)); } else { pteval = ptep_clear_flush(vma, address, pvmw.pte); } /* Move the dirty bit to the 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)) { pteval = swp_entry_to_pte(make_hwpoison_entry(subpage)); if (PageHuge(page)) { int nr = 1 << compound_order(page); hugetlb_count_sub(nr, mm); set_huge_swap_pte_at(mm, address, pvmw.pte, pteval, vma_mmu_pagesize(vma)); } else { dec_mm_counter(mm, mm_counter(page)); set_pte_at(mm, address, pvmw.pte, pteval); } } 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)); /* We have to invalidate as we cleared the pte */ mmu_notifier_invalidate_range(mm, address, address + PAGE_SIZE); } else if (IS_ENABLED(CONFIG_MIGRATION) && (flags & (TTU_MIGRATION|TTU_SPLIT_FREEZE))) { 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(subpage, 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, pvmw.pte, swp_pte); /* * No need to invalidate here it will synchronize on * against the special swap migration pte. */ } else if (PageAnon(page)) { swp_entry_t entry = { .val = page_private(subpage) }; pte_t swp_pte; /* * Store the swap location in the pte. * See handle_pte_fault() ... */ if (unlikely(PageSwapBacked(page) != PageSwapCache(page))) { WARN_ON_ONCE(1); ret = false; /* We have to invalidate as we cleared the pte */ mmu_notifier_invalidate_range(mm, address, address + PAGE_SIZE); page_vma_mapped_walk_done(&pvmw); break; } /* MADV_FREE page check */ if (!PageSwapBacked(page)) { if (!PageDirty(page)) { /* Invalidate as we cleared the pte */ mmu_notifier_invalidate_range(mm, address, address + PAGE_SIZE); dec_mm_counter(mm, MM_ANONPAGES); goto discard; } /* * If the page was redirtied, it cannot be * discarded. Remap the page to page table. */ set_pte_at(mm, address, pvmw.pte, pteval); SetPageSwapBacked(page); ret = false; page_vma_mapped_walk_done(&pvmw); break; } if (swap_duplicate(entry) < 0) { set_pte_at(mm, address, pvmw.pte, pteval); ret = false; page_vma_mapped_walk_done(&pvmw); break; } 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, pvmw.pte, swp_pte); /* Invalidate as we cleared the pte */ mmu_notifier_invalidate_range(mm, address, address + PAGE_SIZE); } else { /* * We should not need to notify here as we reach this * case only from freeze_page() itself only call from * split_huge_page_to_list() so everything below must * be true: * - page is not anonymous * - page is locked * * So as it is a locked file back page thus it can not * be remove from the page cache and replace by a new * page before mmu_notifier_invalidate_range_end so no * concurrent thread might update its page table to * point at new page while a device still is using this * page. * * See Documentation/vm/mmu_notifier.txt */ dec_mm_counter(mm, mm_counter_file(page)); } discard: /* * No need to call mmu_notifier_invalidate_range() it has be * done above for all cases requiring it to happen under page * table lock before mmu_notifier_invalidate_range_end() * * See Documentation/vm/mmu_notifier.txt */ page_remove_rmap(subpage, PageHuge(page)); put_page(page); } mmu_notifier_invalidate_range_end(vma->vm_mm, start, end); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jérôme Glisse22220.33%34.76%
Hugh Dickins19017.40%1320.63%
Kirill A. Shutemov16415.02%812.70%
Andrew Morton11610.62%46.35%
MinChan Kim595.40%57.94%
Zi Yan555.04%11.59%
Andi Kleen514.67%23.17%
Shaohua Li433.94%23.17%
Mel Gorman353.21%23.17%
Punit Agrawal292.66%11.59%
Cyrill V. Gorcunov252.29%11.59%
Naoya Horiguchi222.01%34.76%
Konstantin Weitz171.56%11.59%
Christoph Lameter111.01%46.35%
Kamezawa Hiroyuki80.73%23.17%
Nicholas Piggin80.73%11.59%
Jerome Marchand80.73%11.59%
JoonSoo Kim80.73%11.59%
David S. Miller80.73%23.17%
Linus Torvalds70.64%11.59%
Motohiro Kosaki20.18%11.59%
Björn Steinbrink10.09%11.59%
Konstantin Khlebnikov10.09%11.59%
Sagi Grimberg10.09%11.59%
Andrea Arcangeli10.09%11.59%
Total1092100.00%63100.00%


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

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov2244.90%125.00%
Andrew Morton1428.57%250.00%
Nicholas Piggin1326.53%125.00%
Total49100.00%4100.00%


static bool invalid_migration_vma(struct vm_area_struct *vma, void *arg) { return is_vma_temporary_stack(vma); }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov1780.95%150.00%
Nicholas Piggin419.05%150.00%
Total21100.00%2100.00%


static int page_mapcount_is_zero(struct page *page) { return !total_mapcount(page); }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov1266.67%350.00%
Andrew Morton316.67%233.33%
JoonSoo Kim316.67%116.67%
Total18100.00%6100.00%

/** * 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. * * If unmap is successful, return true. Otherwise, false. */
bool try_to_unmap(struct page *page, enum ttu_flags flags) { struct rmap_walk_control rwc = { .rmap_one = try_to_unmap_one, .arg = (void *)flags, .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|TTU_SPLIT_FREEZE)) && !PageKsm(page) && PageAnon(page)) rwc.invalid_vma = invalid_migration_vma; if (flags & TTU_RMAP_LOCKED) rmap_walk_locked(page, &rwc); else rmap_walk(page, &rwc); return !page_mapcount(page) ? true : false; }

Contributors

PersonTokensPropCommitsCommitProp
JoonSoo Kim3835.19%16.67%
Andrew Morton2523.15%426.67%
Kirill A. Shutemov1715.74%16.67%
MinChan Kim65.56%213.33%
Shaohua Li54.63%16.67%
Naoya Horiguchi43.70%16.67%
Hugh Dickins43.70%16.67%
Andi Kleen32.78%16.67%
Christoph Lameter21.85%16.67%
Konstantin Khlebnikov21.85%16.67%
Rusty Russell21.85%16.67%
Total108100.00%15100.00%


static int page_not_mapped(struct page *page) { return !page_mapped(page); }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov18100.00%1100.00%
Total18100.00%1100.00%

; /** * 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. */
void try_to_munlock(struct page *page) { struct rmap_walk_control rwc = { .rmap_one = try_to_unmap_one, .arg = (void *)TTU_MUNLOCK, .done = page_not_mapped, .anon_lock = page_lock_anon_vma_read, }; VM_BUG_ON_PAGE(!PageLocked(page) || PageLRU(page), page); VM_BUG_ON_PAGE(PageCompound(page) && PageDoubleMap(page), page); rmap_walk(page, &rwc); }

Contributors

PersonTokensPropCommitsCommitProp
JoonSoo Kim2936.71%120.00%
Nicholas Piggin2632.91%120.00%
MinChan Kim1620.25%120.00%
Shaohua Li56.33%120.00%
Sasha Levin33.80%120.00%
Total79100.00%5100.00%


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

PersonTokensPropCommitsCommitProp
Rik Van Riel3172.09%120.00%
Peter Zijlstra613.95%240.00%
Andrey Ryabinin511.63%120.00%
Andrea Arcangeli12.33%120.00%
Total43100.00%5100.00%


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

PersonTokensPropCommitsCommitProp
JoonSoo Kim61100.00%2100.00%
Total61100.00%2100.00%

/* * 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 void rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc, bool locked) { struct anon_vma *anon_vma; pgoff_t pgoff_start, pgoff_end; struct anon_vma_chain *avc; 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; pgoff_start = page_to_pgoff(page); pgoff_end = pgoff_start + hpage_nr_pages(page) - 1; anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root, pgoff_start, pgoff_end) { 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; if (!rwc->rmap_one(page, vma, address, rwc->arg)) break; if (rwc->done && rwc->done(page)) break; } if (!locked) anon_vma_unlock_read(anon_vma); }

Contributors

PersonTokensPropCommitsCommitProp
Hugh Dickins6534.57%17.69%
Kirill A. Shutemov5026.60%215.38%
JoonSoo Kim4121.81%323.08%
Rik Van Riel126.38%17.69%
Davidlohr Bueso A63.19%17.69%
MinChan Kim52.66%215.38%
Michel Lespinasse52.66%17.69%
Andrea Arcangeli31.60%17.69%
Ingo Molnar10.53%17.69%
Total188100.00%13100.00%

/* * 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 void rmap_walk_file(struct page *page, struct rmap_walk_control *rwc, bool locked) { struct address_space *mapping = page_mapping(page); pgoff_t pgoff_start, pgoff_end; struct vm_area_struct *vma; /* * 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; pgoff_start = page_to_pgoff(page); pgoff_end = pgoff_start + hpage_nr_pages(page) - 1; if (!locked) i_mmap_lock_read(mapping); vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff_start, pgoff_end) { unsigned long address = vma_address(page, vma); cond_resched(); if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg)) continue; if (!rwc->rmap_one(page, vma, address, rwc->arg)) goto done; if (rwc->done && rwc->done(page)) goto done; } done: if (!locked) i_mmap_unlock_read(mapping); }

Contributors

PersonTokensPropCommitsCommitProp
Hugh Dickins7139.89%17.14%
JoonSoo Kim5329.78%321.43%
Kirill A. Shutemov3318.54%214.29%
Davidlohr Bueso A95.06%321.43%
MinChan Kim52.81%214.29%
Sasha Levin31.69%17.14%
Andrea Arcangeli31.69%17.14%
Michel Lespinasse10.56%17.14%
Total178100.00%14100.00%


void rmap_walk(struct page *page, struct rmap_walk_control *rwc) { if (unlikely(PageKsm(page))) rmap_walk_ksm(page, rwc); else if (PageAnon(page)) rmap_walk_anon(page, rwc, false); else rmap_walk_file(page, rwc, false); }

Contributors

PersonTokensPropCommitsCommitProp
Hugh Dickins3864.41%125.00%
Kirill A. Shutemov1322.03%125.00%
JoonSoo Kim46.78%125.00%
MinChan Kim46.78%125.00%
Total59100.00%4100.00%

/* Like rmap_walk, but caller holds relevant rmap lock */
void 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)) rmap_walk_anon(page, rwc, true); else rmap_walk_file(page, rwc, true); }

Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov4076.92%125.00%
Hugh Dickins815.38%125.00%
MinChan Kim35.77%125.00%
JoonSoo Kim11.92%125.00%
Total52100.00%4100.00%

#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

PersonTokensPropCommitsCommitProp
Naoya Horiguchi89100.00%2100.00%
Total89100.00%2100.00%


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

PersonTokensPropCommitsCommitProp
Naoya Horiguchi6894.44%250.00%
Kirill A. Shutemov34.17%125.00%
Hugh Dickins11.39%125.00%
Total72100.00%4100.00%


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

PersonTokensPropCommitsCommitProp
Naoya Horiguchi5294.55%150.00%
Kirill A. Shutemov35.45%150.00%
Total55100.00%2100.00%

#endif /* CONFIG_HUGETLB_PAGE */

Overall Contributors

PersonTokensPropCommitsCommitProp
Kirill A. Shutemov124619.26%2310.04%
Hugh Dickins75711.70%3515.28%
Andrew Morton5228.07%166.99%
Peter Zijlstra5177.99%83.49%
JoonSoo Kim4687.23%73.06%
Rik Van Riel4126.37%73.06%
Mel Gorman3224.98%93.93%
Jérôme Glisse2874.44%31.31%
Naoya Horiguchi2523.89%83.49%
Nicholas Piggin2013.11%52.18%
Linus Torvalds1993.08%62.62%
Vladimir Davydov1312.02%41.75%
Konstantin Khlebnikov1261.95%41.75%
MinChan Kim1061.64%93.93%
Andrea Arcangeli961.48%73.06%
Bob Liu951.47%10.44%
Johannes Weiner861.33%83.49%
Andi Kleen610.94%31.31%
Kautuk Consul560.87%10.44%
Zi Yan550.85%10.44%
Shaohua Li530.82%20.87%
Michel Lespinasse480.74%31.31%
Adrian Bunk360.56%10.44%
Ingo Molnar320.49%41.75%
Punit Agrawal290.45%10.44%
Kamezawa Hiroyuki280.43%41.75%
Cyrill V. Gorcunov250.39%10.44%
Oleg Nesterov240.37%20.87%
Christoph Lameter200.31%62.62%
Davidlohr Bueso A180.28%41.75%
Sasha Levin180.28%20.87%
Konstantin Weitz170.26%10.44%
Balbir Singh150.23%31.31%
Fengguang Wu140.22%20.87%
Vlastimil Babka120.19%10.44%
Daniel Forrest100.15%10.44%
David S. Miller80.12%20.87%
Jerome Marchand80.12%10.44%
Motohiro Kosaki70.11%31.31%
Leon Yu70.11%10.44%
Sagi Grimberg60.09%10.44%
Andrey Ryabinin50.08%10.44%
Jaya Kumar50.08%10.44%
Andrew Lutomirski40.06%10.44%
Christoph Hellwig30.05%10.44%
Christian Bornträger30.05%10.44%
Jan Kara30.05%10.44%
Jason Low30.05%10.44%
Pekka J Enberg20.03%10.44%
Paul E. McKenney20.03%10.44%
Rusty Russell20.03%10.44%
Paul Gortmaker10.02%10.44%
Jianyu Zhan10.02%10.44%
Namhyung Kim10.02%10.44%
Aneesh Kumar K.V10.02%10.44%
Steve Capper10.02%10.44%
Randy Dunlap10.02%10.44%
Björn Steinbrink10.02%10.44%
David Rientjes10.02%10.44%
Total6470100.00%229100.00%
Directory: mm
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.