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mm/rmap: Convert the struct anon_vma::mutex to an rwsem 

Convert the struct anon_vma::mutex to an rwsem, which will help
in solving a page-migration scalability problem. (Addressed in
a separate patch.)

The conversion is simple and straightforward: in every case
where we mutex_lock()ed we'll now down_write().

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
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: 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 19:56:46 +00:00 committed by Mel Gorman
parent d28d433512
commit 5a505085f0
4 changed files with 25 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/linux/rmap.h
View File

@ -7,7 +7,7 @@
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/memcontrol.h>
/*
@ -25,8 +25,8 @@
* pointing to this anon_vma once its vma list is empty.
*/
struct anon_vma {
struct anon_vma *root; /* Root of this anon_vma tree */
struct mutex mutex; /* Serialize access to vma list */
struct anon_vma *root; /* Root of this anon_vma tree */
struct rw_semaphore rwsem; /* W: modification, R: walking the list */
/*
* The refcount is taken on an anon_vma when there is no
* guarantee that the vma of page tables will exist for
@ -64,7 +64,7 @@ struct anon_vma_chain {
struct vm_area_struct *vma;
struct anon_vma *anon_vma;
struct list_head same_vma; /* locked by mmap_sem & page_table_lock */
struct rb_node rb; /* locked by anon_vma->mutex */
struct rb_node rb; /* locked by anon_vma->rwsem */
unsigned long rb_subtree_last;
#ifdef CONFIG_DEBUG_VM_RB
unsigned long cached_vma_start, cached_vma_last;
@ -108,24 +108,24 @@ static inline void vma_lock_anon_vma(struct vm_area_struct *vma)
{
struct anon_vma *anon_vma = vma->anon_vma;
if (anon_vma)
mutex_lock(&anon_vma->root->mutex);
down_write(&anon_vma->root->rwsem);
}
static inline void vma_unlock_anon_vma(struct vm_area_struct *vma)
{
struct anon_vma *anon_vma = vma->anon_vma;
if (anon_vma)
mutex_unlock(&anon_vma->root->mutex);
up_write(&anon_vma->root->rwsem);
}
static inline void anon_vma_lock(struct anon_vma *anon_vma)
{
mutex_lock(&anon_vma->root->mutex);
down_write(&anon_vma->root->rwsem);
}
static inline void anon_vma_unlock(struct anon_vma *anon_vma)
{
mutex_unlock(&anon_vma->root->mutex);
up_write(&anon_vma->root->rwsem);
}
/*

4
mm/huge_memory.c
View File

@ -1292,7 +1292,7 @@ static int __split_huge_page_splitting(struct page *page,
* We can't temporarily set the pmd to null in order
* to split it, the pmd must remain marked huge at all
* times or the VM won't take the pmd_trans_huge paths
* and it won't wait on the anon_vma->root->mutex to
* and it won't wait on the anon_vma->root->rwsem to
* serialize against split_huge_page*.
*/
pmdp_splitting_flush(vma, address, pmd);
@ -1495,7 +1495,7 @@ static int __split_huge_page_map(struct page *page,
return ret;
}
/* must be called with anon_vma->root->mutex hold */
/* must be called with anon_vma->root->rwsem held */
static void __split_huge_page(struct page *page,
struct anon_vma *anon_vma)
{

8
mm/mmap.c
View File

@ -2561,15 +2561,15 @@ static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma)
* The LSB of head.next can't change from under us
* because we hold the mm_all_locks_mutex.
*/
mutex_lock_nest_lock(&anon_vma->root->mutex, &mm->mmap_sem);
down_write(&anon_vma->root->rwsem);
/*
* We can safely modify head.next after taking the
* anon_vma->root->mutex. If some other vma in this mm shares
* anon_vma->root->rwsem. If some other vma in this mm shares
* the same anon_vma we won't take it again.
*
* No need of atomic instructions here, head.next
* can't change from under us thanks to the
* anon_vma->root->mutex.
* anon_vma->root->rwsem.
*/
if (__test_and_set_bit(0, (unsigned long *)
&anon_vma->root->rb_root.rb_node))
@ -2671,7 +2671,7 @@ static void vm_unlock_anon_vma(struct anon_vma *anon_vma)
*
* No need of atomic instructions here, head.next
* can't change from under us until we release the
* anon_vma->root->mutex.
* anon_vma->root->rwsem.
*/
if (!__test_and_clear_bit(0, (unsigned long *)
&anon_vma->root->rb_root.rb_node))

22
mm/rmap.c
View File

@ -24,7 +24,7 @@
* mm->mmap_sem
* page->flags PG_locked (lock_page)
* mapping->i_mmap_mutex
* anon_vma->mutex
* 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)
@ -37,7 +37,7 @@
* in arch-dependent flush_dcache_mmap_lock,
* within bdi.wb->list_lock in __sync_single_inode)
*
* anon_vma->mutex,mapping->i_mutex (memory_failure, collect_procs_anon)
* anon_vma->rwsem,mapping->i_mutex (memory_failure, collect_procs_anon)
* ->tasklist_lock
* pte map lock
*/
@ -103,7 +103,7 @@ static inline void anon_vma_free(struct anon_vma *anon_vma)
* LOCK should suffice since the actual taking of the lock must
* happen _before_ what follows.
*/
if (mutex_is_locked(&anon_vma->root->mutex)) {
if (rwsem_is_locked(&anon_vma->root->rwsem)) {
anon_vma_lock(anon_vma);
anon_vma_unlock(anon_vma);
}
@ -219,9 +219,9 @@ static inline struct anon_vma *lock_anon_vma_root(struct anon_vma *root, struct
struct anon_vma *new_root = anon_vma->root;
if (new_root != root) {
if (WARN_ON_ONCE(root))
mutex_unlock(&root->mutex);
up_write(&root->rwsem);
root = new_root;
mutex_lock(&root->mutex);
down_write(&root->rwsem);
}
return root;
}
@ -229,7 +229,7 @@ static inline struct anon_vma *lock_anon_vma_root(struct anon_vma *root, struct
static inline void unlock_anon_vma_root(struct anon_vma *root)
{
if (root)
mutex_unlock(&root->mutex);
up_write(&root->rwsem);
}
/*
@ -349,7 +349,7 @@ void unlink_anon_vmas(struct vm_area_struct *vma)
/*
* 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 acquire the anon_vma->root->mutex.
* 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;
@ -365,7 +365,7 @@ static void anon_vma_ctor(void *data)
{
struct anon_vma *anon_vma = data;
mutex_init(&anon_vma->mutex);
init_rwsem(&anon_vma->rwsem);
atomic_set(&anon_vma->refcount, 0);
anon_vma->rb_root = RB_ROOT;
}
@ -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 (mutex_trylock(&root_anon_vma->mutex)) {
if (down_write_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)) {
mutex_unlock(&root_anon_vma->mutex);
up_write(&root_anon_vma->rwsem);
anon_vma = NULL;
}
goto out;
@ -1299,7 +1299,7 @@ out_mlock:
/*
* We need mmap_sem locking, Otherwise VM_LOCKED check makes
* unstable result and race. Plus, We can't wait here because
* we now hold anon_vma->mutex or mapping->i_mmap_mutex.
* we now hold anon_vma->rwsem or mapping->i_mmap_mutex.
* if trylock failed, the page remain in evictable lru and later
* vmscan could retry to move the page to unevictable lru if the
* page is actually mlocked.