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memcg: fix gfp_mask of callers of charge

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Fix misuse of gfp_kernel.

Now, most of callers of mem_cgroup_charge_xxx functions uses GFP_KERNEL.

I think that this is from the fact that page_cgroup *was* dynamically
allocated.

But now, we allocate all page_cgroup at boot.  And
mem_cgroup_try_to_free_pages() reclaim memory from GFP_HIGHUSER_MOVABLE +
specified GFP_RECLAIM_MASK.

  * This is because we just want to reduce memory usage.
    "Where we should reclaim from ?" is not a problem in memcg.

This patch modifies gfp masks to be GFP_HIGUSER_MOVABLE if possible.

Note: This patch is not for fixing behavior but for showing sane information
      in source code.

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>
This commit is contained in:
KAMEZAWA Hiroyuki
2009-01-07 18:07:49 -08:00
committed by Linus Torvalds
parent 7a81b88cb5
commit bced0520fe
4 changed files with 14 additions and 11 deletions
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8
mm/memcontrol.c
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@@ -808,8 +808,9 @@ int mem_cgroup_prepare_migration(struct page *page, struct page *newpage)
}
unlock_page_cgroup(pc);
if (mem) {
ret = mem_cgroup_charge_common(newpage, NULL, GFP_KERNEL,
ctype, mem);
ret = mem_cgroup_charge_common(newpage, NULL,
GFP_HIGHUSER_MOVABLE,
ctype, mem);
css_put(&mem->css);
}
return ret;
@@ -889,7 +890,8 @@ static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
ret = -EBUSY;
break;
}
progress = try_to_free_mem_cgroup_pages(memcg, GFP_KERNEL);
progress = try_to_free_mem_cgroup_pages(memcg,
GFP_HIGHUSER_MOVABLE);
if (!progress)
retry_count--;
}