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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-01-07 18:07:50 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:04 -0800
commit01b1ae63c2270cbacfd43fea94578c17950eb548 (patch)
treeab0275f32e8548c4413014d43cab1f52f03c9c5c /include
parentbced0520fe462bb94021dcabd32e99630c171be2 (diff)
memcg: simple migration handling
Now, management of "charge" under page migration is done under following manner. (Assume migrate page contents from oldpage to newpage) before - "newpage" is charged before migration. at success. - "oldpage" is uncharged at somewhere(unmap, radix-tree-replace) at failure - "newpage" is uncharged. - "oldpage" is charged if necessary (*1) But (*1) is not reliable....because of GFP_ATOMIC. This patch tries to change behavior as following by charge/commit/cancel ops. before - charge PAGE_SIZE (no target page) success - commit charge against "newpage". failure - commit charge against "oldpage". (PCG_USED bit works effectively to avoid double-counting) - if "oldpage" is obsolete, cancel charge of PAGE_SIZE. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/memcontrol.h19
1 files changed, 7 insertions, 12 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index c592f315cd0..b095f5f6ecf 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -29,8 +29,6 @@ struct mm_struct;
extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask);
-extern int mem_cgroup_charge_migrate_fixup(struct page *page,
- struct mm_struct *mm, gfp_t gfp_mask);
/* for swap handling */
extern int mem_cgroup_try_charge(struct mm_struct *mm,
gfp_t gfp_mask, struct mem_cgroup **ptr);
@@ -60,8 +58,9 @@ extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
((cgroup) == mem_cgroup_from_task((mm)->owner))
extern int
-mem_cgroup_prepare_migration(struct page *page, struct page *newpage);
-extern void mem_cgroup_end_migration(struct page *page);
+mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
+extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
+ struct page *oldpage, struct page *newpage);
/*
* For memory reclaim.
@@ -94,12 +93,6 @@ static inline int mem_cgroup_cache_charge(struct page *page,
return 0;
}
-static inline int mem_cgroup_charge_migrate_fixup(struct page *page,
- struct mm_struct *mm, gfp_t gfp_mask)
-{
- return 0;
-}
-
static inline int mem_cgroup_try_charge(struct mm_struct *mm,
gfp_t gfp_mask, struct mem_cgroup **ptr)
{
@@ -144,12 +137,14 @@ static inline int task_in_mem_cgroup(struct task_struct *task,
}
static inline int
-mem_cgroup_prepare_migration(struct page *page, struct page *newpage)
+mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
{
return 0;
}
-static inline void mem_cgroup_end_migration(struct page *page)
+static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
+ struct page *oldpage,
+ struct page *newpage)
{
}