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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2008-07-25 04:47:15 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 13:53:37 -0400
commitc9b0ed51483cc2fc42bb801b6675c4231b0e4634 (patch)
tree1d322b4bfcaad3296752f6efcab918d1b13b50a3 /mm/memcontrol.c
parent69029cd550284e32de13d6dd2f77b723c8a0e444 (diff)
memcg: helper function for relcaim from shmem.
A new call, mem_cgroup_shrink_usage() is added for shmem handling and relacing non-standard usage of mem_cgroup_charge/uncharge. Now, shmem calls mem_cgroup_charge() just for reclaim some pages from mem_cgroup. In general, shmem is used by some process group and not for global resource (like file caches). So, it's reasonable to reclaim pages from mem_cgroup where shmem is mainly used. [hugh@veritas.com: shmem_getpage release page sooner] [hugh@veritas.com: mem_cgroup_shrink_usage css_put] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Cc: Paul Menage <menage@google.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a61706193c31..f46b8615de6c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -781,6 +781,32 @@ void mem_cgroup_end_migration(struct page *newpage)
781} 781}
782 782
783/* 783/*
784 * A call to try to shrink memory usage under specified resource controller.
785 * This is typically used for page reclaiming for shmem for reducing side
786 * effect of page allocation from shmem, which is used by some mem_cgroup.
787 */
788int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask)
789{
790 struct mem_cgroup *mem;
791 int progress = 0;
792 int retry = MEM_CGROUP_RECLAIM_RETRIES;
793
794 rcu_read_lock();
795 mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
796 css_get(&mem->css);
797 rcu_read_unlock();
798
799 do {
800 progress = try_to_free_mem_cgroup_pages(mem, gfp_mask);
801 } while (!progress && --retry);
802
803 css_put(&mem->css);
804 if (!retry)
805 return -ENOMEM;
806 return 0;
807}
808
809/*
784 * This routine traverse page_cgroup in given list and drop them all. 810 * This routine traverse page_cgroup in given list and drop them all.
785 * *And* this routine doesn't reclaim page itself, just removes page_cgroup. 811 * *And* this routine doesn't reclaim page itself, just removes page_cgroup.
786 */ 812 */