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memcg: helper function for relcaim from shmem.

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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.

[[email protected]: shmem_getpage release page sooner]
[[email protected]: mem_cgroup_shrink_usage css_put]
Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Cc: Li Zefan <[email protected]>
Cc: YAMAMOTO Takashi <[email protected]>
Cc: Paul Menage <[email protected]>
Cc: David Rientjes <[email protected]>
Signed-off-by: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
KAMEZAWA Hiroyuki 2008-07-25 01:47:15 -07:00 • committed by Linus Torvalds
commit c9b0ed5148
3 changed files with 37 additions and 7 deletions
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11
mm/shmem.c
View file

@ -1315,17 +1315,14 @@ repeat:
shmem_swp_unmap(entry);
spin_unlock(&info->lock);
unlock_page(swappage);
page_cache_release(swappage);
if (error == -ENOMEM) {
/* allow reclaim from this memory cgroup */
error = mem_cgroup_cache_charge(swappage,
current->mm, gfp & ~__GFP_HIGHMEM);
if (error) {
page_cache_release(swappage);
error = mem_cgroup_shrink_usage(current->mm,
gfp);
if (error)
goto failed;
}
mem_cgroup_uncharge_cache_page(swappage);
}
page_cache_release(swappage);
goto repeat;
}
} else if (sgp == SGP_READ && !filepage) {