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authorJohannes Weiner <hannes@cmpxchg.org>2016-03-15 14:57:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-15 16:55:16 -0700
commit81f8c3a461d16f0355ced3d56d6d1bb5923207a1 (patch)
tree5d821760ca548b4357221c0399b92b7154221c33 /mm/filemap.c
parent0db2cb8da89d991762ec2aece45e55ceaee34664 (diff)
downloadop-kernel-dev-81f8c3a461d16f0355ced3d56d6d1bb5923207a1.zip
op-kernel-dev-81f8c3a461d16f0355ced3d56d6d1bb5923207a1.tar.gz
mm: memcontrol: generalize locking for the page->mem_cgroup binding
These patches tag the page cache radix tree eviction entries with the memcg an evicted page belonged to, thus making per-cgroup LRU reclaim work properly and be as adaptive to new cache workingsets as global reclaim already is. This should have been part of the original thrash detection patch series, but was deferred due to the complexity of those patches. This patch (of 5): So far the only sites that needed to exclude charge migration to stabilize page->mem_cgroup have been per-cgroup page statistics, hence the name mem_cgroup_begin_page_stat(). But per-cgroup thrash detection will add another site that needs to ensure page->mem_cgroup lifetime. Rename these locking functions to the more generic lock_page_memcg() and unlock_page_memcg(). Since charge migration is a cgroup1 feature only, we might be able to delete it at some point, and these now easy to identify locking sites along with it. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Suggested-by: Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 4a0f5fa..ee8140c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -101,7 +101,7 @@
* ->tree_lock (page_remove_rmap->set_page_dirty)
* bdi.wb->list_lock (page_remove_rmap->set_page_dirty)
* ->inode->i_lock (page_remove_rmap->set_page_dirty)
- * ->memcg->move_lock (page_remove_rmap->mem_cgroup_begin_page_stat)
+ * ->memcg->move_lock (page_remove_rmap->lock_page_memcg)
* bdi.wb->list_lock (zap_pte_range->set_page_dirty)
* ->inode->i_lock (zap_pte_range->set_page_dirty)
* ->private_lock (zap_pte_range->__set_page_dirty_buffers)
@@ -177,7 +177,7 @@ static void page_cache_tree_delete(struct address_space *mapping,
* Delete a page from the page cache and free it. Caller has to make
* sure the page is locked and that nobody else uses it - or that usage
* is safe. The caller must hold the mapping's tree_lock and
- * mem_cgroup_begin_page_stat().
+ * lock_page_memcg().
*/
void __delete_from_page_cache(struct page *page, void *shadow,
struct mem_cgroup *memcg)
@@ -263,11 +263,11 @@ void delete_from_page_cache(struct page *page)
freepage = mapping->a_ops->freepage;
- memcg = mem_cgroup_begin_page_stat(page);
+ memcg = lock_page_memcg(page);
spin_lock_irqsave(&mapping->tree_lock, flags);
__delete_from_page_cache(page, NULL, memcg);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- mem_cgroup_end_page_stat(memcg);
+ unlock_page_memcg(memcg);
if (freepage)
freepage(page);
@@ -561,7 +561,7 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
new->mapping = mapping;
new->index = offset;
- memcg = mem_cgroup_begin_page_stat(old);
+ memcg = lock_page_memcg(old);
spin_lock_irqsave(&mapping->tree_lock, flags);
__delete_from_page_cache(old, NULL, memcg);
error = radix_tree_insert(&mapping->page_tree, offset, new);
@@ -576,7 +576,7 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
if (PageSwapBacked(new))
__inc_zone_page_state(new, NR_SHMEM);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- mem_cgroup_end_page_stat(memcg);
+ unlock_page_memcg(memcg);
mem_cgroup_replace_page(old, new);
radix_tree_preload_end();
if (freepage)
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