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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2012-01-12 17:18:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-12 20:13:07 -0800
commitdc67d50465f249bb357bf85b3ed1f642eb00130a (patch)
treef3808a1bebe5dfbf1691603007966b7222376d55 /mm
parentde077d222d5ca6108cab119a09593344c12100ab (diff)
downloadlinaro-lsk-dc67d50465f249bb357bf85b3ed1f642eb00130a.tar.gz
memcg: simplify page cache charging
This patch is a clean up. No functional/logical changes. Because of commit ef6a3c6311 ("mm: add replace_page_cache_page() function") , FUSE uses replace_page_cache() instead of add_to_page_cache(). Then, mem_cgroup_cache_charge() is not called against FUSE's pages from splice. So now, mem_cgroup_cache_charge() gets pages that are not on the LRU with the exception of PageSwapCache pages. For checking, WARN_ON_ONCE(PageLRU(page)) is added. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Ying Han <yinghan@google.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c31
1 files changed, 9 insertions, 22 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 7bc30707d0c..71bac4d720d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2790,6 +2790,7 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
struct mem_cgroup *memcg = NULL;
+ enum charge_type type = MEM_CGROUP_CHARGE_TYPE_CACHE;
int ret;
if (mem_cgroup_disabled())
@@ -2799,31 +2800,17 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
if (unlikely(!mm))
mm = &init_mm;
+ if (!page_is_file_cache(page))
+ type = MEM_CGROUP_CHARGE_TYPE_SHMEM;
- if (page_is_file_cache(page)) {
- ret = __mem_cgroup_try_charge(mm, gfp_mask, 1, &memcg, true);
- if (ret || !memcg)
- return ret;
-
- /*
- * FUSE reuses pages without going through the final
- * put that would remove them from the LRU list, make
- * sure that they get relinked properly.
- */
- __mem_cgroup_commit_charge_lrucare(page, memcg,
- MEM_CGROUP_CHARGE_TYPE_CACHE);
- return ret;
- }
- /* shmem */
- if (PageSwapCache(page)) {
+ if (!PageSwapCache(page)) {
+ ret = mem_cgroup_charge_common(page, mm, gfp_mask, type);
+ WARN_ON_ONCE(PageLRU(page));
+ } else { /* page is swapcache/shmem */
ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &memcg);
if (!ret)
- __mem_cgroup_commit_charge_swapin(page, memcg,
- MEM_CGROUP_CHARGE_TYPE_SHMEM);
- } else
- ret = mem_cgroup_charge_common(page, mm, gfp_mask,
- MEM_CGROUP_CHARGE_TYPE_SHMEM);
-
+ __mem_cgroup_commit_charge_swapin(page, memcg, type);
+ }
return ret;
}