linux-kernel - Re: cgroup: real meaning of memory.usage_in

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Message-ID: <20110322073514.GB12940@tiehlicka.suse.cz>
Date:	Tue, 22 Mar 2011 08:35:14 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Ying Han <yinghan@...gle.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: cgroup: real meaning of memory.usage_in_bytes

On Mon 21-03-11 10:22:41, Ying Han wrote:
[...]
> 
> Michal,
> 
> Can you help to post the test result after applying the patch?

The result of the LTP test is:
TEST 4: MEMORY CONTROLLER TESTING
RUNNING SETUP.....
WARN:/dev/memctl already exist..overwriting
Cleanup called
TEST STARTED: Please avoid using system while this test executes
memory usage from memory.usage_in_bytes= 62955520
memory usage from memory.stat= 62955520
TINFO   Memory Resource Controller: stat check test passes first run
Test continues to run the second step.
memory usage from memory.usage_in_bytes= 78643200
memory usage from memory.stat=78643200
TPASS   Memory Resource Controller: stat check test PASSED
Memory Resource Controller test executed successfully.
Cleanup called

The attached simple test case result is:
# mkdir /dev/memctl; mount -t cgroup -omemory cgroup /dev/memctl; cd /dev/memctl
# mkdir group_1; cd group_1; echo 100M > memory.limit_in_bytes
# cat memory.{usage_in_bytes,stat} 
0
cache 0
rss 0
[start the test case, add its pid to the group and let it fault in]

# cat memory.{usage_in_bytes,stat} 
4096
cache 0
rss 4096

[let it finish]
# cat memory.{usage_in_bytes,stat} 
0
cache 0
rss 0

Thanks
-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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