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authorDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>2009-04-30 18:08:19 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-05-02 18:36:09 -0400
commitae3abae64f177586be55b04a7fb7047a34b21a3e (patch)
tree05ba2ef8dca958cc4a02ac08e5aae03b8bc82a81 /mm/shmem.c
parent0816178638c15ce5472d39d771a96860dff4141a (diff)
memcg: fix mem_cgroup_shrink_usage()
Current mem_cgroup_shrink_usage() has two problems. 1. It doesn't call mem_cgroup_out_of_memory and doesn't update last_oom_jiffies, so pagefault_out_of_memory invokes global OOM. 2. Considering hierarchy, shrinking has to be done from the mem_over_limit, not from the memcg which the page would be charged to. mem_cgroup_try_charge_swapin() does all of these things properly, so we use it and call cancel_charge_swapin when it succeeded. The name of "shrink_usage" is not appropriate for this behavior, so we change it too. Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.cn> Cc: Paul Menage <menage@google.com> Cc: Dhaval Giani <dhaval@linux.vnet.ibm.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 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/shmem.c')
-rw-r--r--mm/shmem.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index f9cb20ebb99..b25f95ce3db 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1340,8 +1340,12 @@ repeat:
1340 shmem_swp_unmap(entry); 1340 shmem_swp_unmap(entry);
1341 spin_unlock(&info->lock); 1341 spin_unlock(&info->lock);
1342 if (error == -ENOMEM) { 1342 if (error == -ENOMEM) {
1343 /* allow reclaim from this memory cgroup */ 1343 /*
1344 error = mem_cgroup_shrink_usage(swappage, 1344 * reclaim from proper memory cgroup and
1345 * call memcg's OOM if needed.
1346 */
1347 error = mem_cgroup_shmem_charge_fallback(
1348 swappage,
1345 current->mm, 1349 current->mm,
1346 gfp); 1350 gfp);
1347 if (error) { 1351 if (error) {