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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-01-08 05:07:48 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 19:31:04 +0300
commit7a81b88cb53e335ff7d019e6398c95792c817d93 (patch)
tree6ebca4d509a541ac707e10f9369916549e90c0ad /mm/migrate.c
parent0b82ac37b889ec881b645860da3775118effb3ca (diff)
downloadlinux-7a81b88cb53e335ff7d019e6398c95792c817d93.tar.xz
memcg: introduce charge-commit-cancel style of functions
There is a small race in do_swap_page(). When the page swapped-in is charged, the mapcount can be greater than 0. But, at the same time some process (shares it ) call unmap and make mapcount 1->0 and the page is uncharged. CPUA CPUB mapcount == 1. (1) charge if mapcount==0 zap_pte_range() (2) mapcount 1 => 0. (3) uncharge(). (success) (4) set page's rmap() mapcount 0=>1 Then, this swap page's account is leaked. For fixing this, I added a new interface. - charge account to res_counter by PAGE_SIZE and try to free pages if necessary. - commit register page_cgroup and add to LRU if necessary. - cancel uncharge PAGE_SIZE because of do_swap_page failure. CPUA (1) charge (always) (2) set page's rmap (mapcount > 0) (3) commit charge was necessary or not after set_pte(). This protocol uses PCG_USED bit on page_cgroup for avoiding over accounting. Usual mem_cgroup_charge_common() does charge -> commit at a time. And this patch also adds following function to clarify all charges. - mem_cgroup_newpage_charge() ....replacement for mem_cgroup_charge() called against newly allocated anon pages. - mem_cgroup_charge_migrate_fixup() called only from remove_migration_ptes(). we'll have to rewrite this later.(this patch just keeps old behavior) This function will be removed by additional patch to make migration clearer. Good for clarifying "what we do" Then, we have 4 following charge points. - newpage - swap-in - add-to-cache. - migration. [akpm@linux-foundation.org: add missing inline directives to stubs] 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 'mm/migrate.c')
-rw-r--r--mm/migrate.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 55373983c9c6..246dcb973ae7 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -133,7 +133,7 @@ static void remove_migration_pte(struct vm_area_struct *vma,
* be reliable, and this charge can actually fail: oh well, we don't
* make the situation any worse by proceeding as if it had succeeded.
*/
- mem_cgroup_charge(new, mm, GFP_ATOMIC);
+ mem_cgroup_charge_migrate_fixup(new, mm, GFP_ATOMIC);
get_page(new);
pte = pte_mkold(mk_pte(new, vma->vm_page_prot));