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authorHugh Dickins <hugh@veritas.com>2008-03-04 14:29:08 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-04 16:35:15 -0800
commit8289546e573d5ff681cdf0fc7a1184cca66fdb55 (patch)
tree9cf874b55eb9a6c97233d137278c7b7c89a5f4a1 /mm
parent7e924aafa4b03ff71de34af8553d9a1ebc86c071 (diff)
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memcg: remove mem_cgroup_uncharge
Nothing uses mem_cgroup_uncharge apart from mem_cgroup_uncharge_page, (a trivial wrapper around it) and mem_cgroup_end_migration (which does the same as mem_cgroup_uncharge_page). And it often ends up having to lock just to let its caller unlock. Remove it (but leave the silly locking until a later patch). Moved mem_cgroup_cache_charge next to mem_cgroup_charge in memcontrol.h. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: David Rientjes <rientjes@google.com> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hirokazu Takahashi <taka@valinux.co.jp> Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Cc: Paul Menage <menage@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.c23
1 files changed, 8 insertions, 15 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 83ba13a..1333d25 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -697,20 +697,22 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
/*
* Uncharging is always a welcome operation, we never complain, simply
- * uncharge. This routine should be called with lock_page_cgroup held
+ * uncharge.
*/
-void mem_cgroup_uncharge(struct page_cgroup *pc)
+void mem_cgroup_uncharge_page(struct page *page)
{
+ struct page_cgroup *pc;
struct mem_cgroup *mem;
struct mem_cgroup_per_zone *mz;
- struct page *page;
unsigned long flags;
/*
* Check if our page_cgroup is valid
*/
+ lock_page_cgroup(page);
+ pc = page_get_page_cgroup(page);
if (!pc)
- return;
+ goto unlock;
if (atomic_dec_and_test(&pc->ref_cnt)) {
page = pc->page;
@@ -731,12 +733,8 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
}
lock_page_cgroup(page);
}
-}
-void mem_cgroup_uncharge_page(struct page *page)
-{
- lock_page_cgroup(page);
- mem_cgroup_uncharge(page_get_page_cgroup(page));
+unlock:
unlock_page_cgroup(page);
}
@@ -759,12 +757,7 @@ int mem_cgroup_prepare_migration(struct page *page)
void mem_cgroup_end_migration(struct page *page)
{
- struct page_cgroup *pc;
-
- lock_page_cgroup(page);
- pc = page_get_page_cgroup(page);
- mem_cgroup_uncharge(pc);
- unlock_page_cgroup(page);
+ mem_cgroup_uncharge_page(page);
}
/*
* We know both *page* and *newpage* are now not-on-LRU and Pg_locked.