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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-06-17 16:27:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-18 13:03:47 -0700
commit8a9478ca7f4bcb8945cec7f95d52dae2d5e50cbd (patch)
tree935e6ee3340ebe999374b54967cc2fa14e8d0060 /include
parent20ebcdda78a282d1d5266887ddf8a2d670182576 (diff)
downloadop-kernel-dev-8a9478ca7f4bcb8945cec7f95d52dae2d5e50cbd.zip
op-kernel-dev-8a9478ca7f4bcb8945cec7f95d52dae2d5e50cbd.tar.gz
memcg: fix swap accounting
This patch fixes mis-accounting of swap usage in memcg. In the current implementation, memcg's swap account is uncharged only when swap is completely freed. But there are several cases where swap cannot be freed cleanly. For handling that, this patch changes that memcg uncharges swap account when swap has no references other than cache. By this, memcg's swap entry accounting can be fully synchronous with the application's behavior. This patch also changes memcg's hooks for swap-out. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Acked-by: Balbir Singh <balbir@in.ibm.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Dhaval Giani <dhaval@linux.vnet.ibm.com> Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/swap.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index dca9b99..c88b366 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -319,10 +319,11 @@ static inline void disable_swap_token(void)
}
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-extern void mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent);
+extern void
+mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout);
#else
static inline void
-mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent)
+mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout)
{
}
#endif
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