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mm/rmap, migration: Make rmap_walk_anon() and try_to_unmap_anon() more scalable

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rmap_walk_anon() and try_to_unmap_anon() appears to be too
careful about locking the anon vma: while it needs protection
against anon vma list modifications, it does not need exclusive
access to the list itself.

Transforming this exclusive lock to a read-locked rwsem removes
a global lock from the hot path of page-migration intense
threaded workloads which can cause pathological performance like
this:

    96.43%        process 0  [kernel.kallsyms]  [k] perf_trace_sched_switch
                  |
                  --- perf_trace_sched_switch
                      __schedule
                      schedule
                      schedule_preempt_disabled
                      __mutex_lock_common.isra.6
                      __mutex_lock_slowpath
                      mutex_lock
                     |
                     |--50.61%-- rmap_walk
                     |          move_to_new_page
                     |          migrate_pages
                     |          migrate_misplaced_page
                     |          __do_numa_page.isra.69
                     |          handle_pte_fault
                     |          handle_mm_fault
                     |          __do_page_fault
                     |          do_page_fault
                     |          page_fault
                     |          __memset_sse2
                     |          |
                     |           --100.00%-- worker_thread
                     |                     |
                     |                      --100.00%-- start_thread
                     |
                      --49.39%-- page_lock_anon_vma
                                try_to_unmap_anon
                                try_to_unmap
                                migrate_pages
                                migrate_misplaced_page
                                __do_numa_page.isra.69
                                handle_pte_fault
                                handle_mm_fault
                                __do_page_fault
                                do_page_fault
                                page_fault
                                __memset_sse2
                                |
                                 --100.00%-- worker_thread
                                           start_thread

With this change applied the profile is now nicely flat
and there's no anon-vma related scheduling/blocking.

Rename anon_vma_[un]lock() => anon_vma_[un]lock_write(),
to make it clearer that it's an exclusive write-lock in
that case - suggested by Rik van Riel.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Turner <pjt@google.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
This commit is contained in:
Ingo Molnar 2012-12-02 19:56:50 +00:00 • committed by Mel Gorman
commit 4fc3f1d66b
9 changed files with 50 additions and 39 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/huge_mm.h
View file

@ -102,7 +102,7 @@ extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
#define wait_split_huge_page(__anon_vma, __pmd) \
do { \
pmd_t *____pmd = (__pmd); \
anon_vma_lock(__anon_vma); \
anon_vma_lock_write(__anon_vma); \
anon_vma_unlock(__anon_vma); \
BUG_ON(pmd_trans_splitting(*____pmd) || \
pmd_trans_huge(*____pmd)); \

17
include/linux/rmap.h
View file

@ -118,7 +118,7 @@ static inline void vma_unlock_anon_vma(struct vm_area_struct *vma)
up_write(&anon_vma->root->rwsem);
}
static inline void anon_vma_lock(struct anon_vma *anon_vma)
static inline void anon_vma_lock_write(struct anon_vma *anon_vma)
{
down_write(&anon_vma->root->rwsem);
}
@ -128,6 +128,17 @@ static inline void anon_vma_unlock(struct anon_vma *anon_vma)
up_write(&anon_vma->root->rwsem);
}
static inline void anon_vma_lock_read(struct anon_vma *anon_vma)
{
down_read(&anon_vma->root->rwsem);
}
static inline void anon_vma_unlock_read(struct anon_vma *anon_vma)
{
up_read(&anon_vma->root->rwsem);
}
/*
* anon_vma helper functions.
*/
@ -220,8 +231,8 @@ int try_to_munlock(struct page *);
/*
* Called by memory-failure.c to kill processes.
*/
struct anon_vma *page_lock_anon_vma(struct page *page);
void page_unlock_anon_vma(struct anon_vma *anon_vma);
struct anon_vma *page_lock_anon_vma_read(struct page *page);
void page_unlock_anon_vma_read(struct anon_vma *anon_vma);
int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma);
/*

6
mm/huge_memory.c
View file

@ -1549,7 +1549,7 @@ int split_huge_page(struct page *page)
int ret = 1;
BUG_ON(!PageAnon(page));
anon_vma = page_lock_anon_vma(page);
anon_vma = page_lock_anon_vma_read(page);
if (!anon_vma)
goto out;
ret = 0;
@ -1562,7 +1562,7 @@ int split_huge_page(struct page *page)
BUG_ON(PageCompound(page));
out_unlock:
page_unlock_anon_vma(anon_vma);
page_unlock_anon_vma_read(anon_vma);
out:
return ret;
}
@ -2074,7 +2074,7 @@ static void collapse_huge_page(struct mm_struct *mm,
if (!pmd_present(*pmd) || pmd_trans_huge(*pmd))
goto out;
anon_vma_lock(vma->anon_vma);
anon_vma_lock_write(vma->anon_vma);
pte = pte_offset_map(pmd, address);
ptl = pte_lockptr(mm, pmd);

6
mm/ksm.c
View file

@ -1634,7 +1634,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
anon_vma_lock(anon_vma);
anon_vma_lock_write(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) {
vma = vmac->vma;
@ -1688,7 +1688,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
anon_vma_lock(anon_vma);
anon_vma_lock_write(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) {
vma = vmac->vma;
@ -1741,7 +1741,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
anon_vma_lock(anon_vma);
anon_vma_lock_write(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) {
vma = vmac->vma;

4
mm/memory-failure.c
View file

@ -402,7 +402,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill,
struct anon_vma *av;
pgoff_t pgoff;
av = page_lock_anon_vma(page);
av = page_lock_anon_vma_read(page);
if (av == NULL) /* Not actually mapped anymore */
return;
@ -423,7 +423,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill,
}
}
read_unlock(&tasklist_lock);
page_unlock_anon_vma(av);
page_unlock_anon_vma_read(av);
}
/*

2
mm/migrate.c
View file

@ -754,7 +754,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
*/
if (PageAnon(page)) {
/*
* Only page_lock_anon_vma() understands the subtleties of
* Only page_lock_anon_vma_read() understands the subtleties of
* getting a hold on an anon_vma from outside one of its mms.
*/
anon_vma = page_get_anon_vma(page);

2
mm/mmap.c
View file

@ -602,7 +602,7 @@ again: remove_next = 1 + (end > next->vm_end);
if (anon_vma) {
VM_BUG_ON(adjust_next && next->anon_vma &&
anon_vma != next->anon_vma);
anon_vma_lock(anon_vma);
anon_vma_lock_write(anon_vma);
anon_vma_interval_tree_pre_update_vma(vma);
if (adjust_next)
anon_vma_interval_tree_pre_update_vma(next);

2
mm/mremap.c
View file

@ -104,7 +104,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
}
if (vma->anon_vma) {
anon_vma = vma->anon_vma;
anon_vma_lock(anon_vma);
anon_vma_lock_write(anon_vma);
}
}

48
mm/rmap.c
View file

@ -87,24 +87,24 @@ 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() such that
* 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
* mutex_trylock() from page_lock_anon_vma(). This orders:
* down_read_trylock() from page_lock_anon_vma_read(). This orders:
*
* page_lock_anon_vma() VS put_anon_vma()
* mutex_trylock() atomic_dec_and_test()
* page_lock_anon_vma_read() VS put_anon_vma()
* down_read_trylock() atomic_dec_and_test()
* LOCK MB
* atomic_read() mutex_is_locked()
* atomic_read() rwsem_is_locked()
*
* LOCK should suffice since the actual taking of the lock must
* happen _before_ what follows.
*/
if (rwsem_is_locked(&anon_vma->root->rwsem)) {
anon_vma_lock(anon_vma);
anon_vma_lock_write(anon_vma);
anon_vma_unlock(anon_vma);
}
@ -146,7 +146,7 @@ static void anon_vma_chain_link(struct vm_area_struct *vma,
* 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()
* 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).
@ -181,7 +181,7 @@ int anon_vma_prepare(struct vm_area_struct *vma)
allocated = anon_vma;
}
anon_vma_lock(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)) {
@ -306,7 +306,7 @@ int anon_vma_fork(struct vm_area_struct *vma, struct vm_area_struct *pvma)
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(anon_vma);
anon_vma_lock_write(anon_vma);
anon_vma_chain_link(vma, avc, anon_vma);
anon_vma_unlock(anon_vma);
@ -442,7 +442,7 @@ out:
* 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(struct page *page)
struct anon_vma *page_lock_anon_vma_read(struct page *page)
{
struct anon_vma *anon_vma = NULL;
struct anon_vma *root_anon_vma;
@ -457,14 +457,14 @@ struct anon_vma *page_lock_anon_vma(struct page *page)
anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
root_anon_vma = ACCESS_ONCE(anon_vma->root);
if (down_write_trylock(&root_anon_vma->rwsem)) {
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_write(&root_anon_vma->rwsem);
up_read(&root_anon_vma->rwsem);
anon_vma = NULL;
}
goto out;
@ -484,15 +484,15 @@ struct anon_vma *page_lock_anon_vma(struct page *page)
/* we pinned the anon_vma, its safe to sleep */
rcu_read_unlock();
anon_vma_lock(anon_vma);
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() recursion.
* we'll deadlock on the anon_vma_lock_write() recursion.
*/
anon_vma_unlock(anon_vma);
anon_vma_unlock_read(anon_vma);
__put_anon_vma(anon_vma);
anon_vma = NULL;
}
@ -504,9 +504,9 @@ out:
return anon_vma;
}
void page_unlock_anon_vma(struct anon_vma *anon_vma)
void page_unlock_anon_vma_read(struct anon_vma *anon_vma)
{
anon_vma_unlock(anon_vma);
anon_vma_unlock_read(anon_vma);
}
/*
@ -732,7 +732,7 @@ static int page_referenced_anon(struct page *page,
struct anon_vma_chain *avc;
int referenced = 0;
anon_vma = page_lock_anon_vma(page);
anon_vma = page_lock_anon_vma_read(page);
if (!anon_vma)
return referenced;
@ -754,7 +754,7 @@ static int page_referenced_anon(struct page *page,
break;
}
page_unlock_anon_vma(anon_vma);
page_unlock_anon_vma_read(anon_vma);
return referenced;
}
@ -1474,7 +1474,7 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
struct anon_vma_chain *avc;
int ret = SWAP_AGAIN;
anon_vma = page_lock_anon_vma(page);
anon_vma = page_lock_anon_vma_read(page);
if (!anon_vma)
return ret;
@ -1501,7 +1501,7 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
break;
}
page_unlock_anon_vma(anon_vma);
page_unlock_anon_vma_read(anon_vma);
return ret;
}
@ -1696,7 +1696,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
int ret = SWAP_AGAIN;
/*
* Note: remove_migration_ptes() cannot use page_lock_anon_vma()
* 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
@ -1704,7 +1704,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
anon_vma = page_anon_vma(page);
if (!anon_vma)
return ret;
anon_vma_lock(anon_vma);
anon_vma_lock_read(anon_vma);
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);
@ -1712,7 +1712,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
if (ret != SWAP_AGAIN)
break;
}
anon_vma_unlock(anon_vma);
anon_vma_unlock_read(anon_vma);
return ret;
}