linux-kernel - Re: About cgroup memory limits

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FAC5DA9.90202@jp.fujitsu.com>
Date:	Fri, 11 May 2012 09:30:33 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andre Nathan <andre@...irati.com.br>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: About cgroup memory limits

(2012/05/10 19:55), Andre Nathan wrote:

> Thanks a lot Kame.
> 
> On Thu, 2012-05-10 at 18:47 +0900, KAMEZAWA Hiroyuki wrote:
>> From above, rss + mapped_file == resident.
> 
> But if you check the numbers I get from memory.stat and the sum of the
> statm fields for all container processes, this doesn't hold.
> 
> resident    = 28741632
> rss         = 8192000
> mapped_file = 3743744
> 
> Am I missing something here?
> 

Considering again...

file_mapped is accounted into the memcg where it's accounted as 'cache' to.

So, you can know 'mapped_file/caches ratio' but you can't know which cgroup
maps it.

>        size  resident     share     text  lib       data  dt
>   897208320  28741632  20500480  1171456    0  170676224   0
> 
 
resident - share = anon.

28741632  - 20500480 = 8241152 (anon)  near value to rss.

About file_mapped, 3743744(mapped_file)  * 100 /20500480(shared) = 18 %

18% of your app's file-mapping may be accounted into the memcg.

You may be able to different score if you do all test after drop-cache.
echo 3 > /proc/sys/vm/drop_caches

Thanks,
-Kame




--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/