linux-kernel - Re: [patch 0/7] improve memcg oom killer robustness v2

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Message-Id: <20130918163306.3620C973@pobox.sk>
Date:	Wed, 18 Sep 2013 16:33:06 +0200
From:	"azurIt" <azurit@...ox.sk>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	<linux-mm@...ck.org>, <cgroups@...r.kernel.org>, <x86@...nel.org>,
	<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/7] improve memcg oom killer robustness v2

> CC: "Johannes Weiner" <hannes@...xchg.org>, "Andrew Morton" <akpm@...ux-foundation.org>, "David Rientjes" <rientjes@...gle.com>, "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>, "KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>, linux-mm@...ck.org, cgroups@...r.kernel.org, x86@...nel.org, linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
>On Wed 18-09-13 16:03:04, azurIt wrote:
>[..]
>> I was finally able to get stack of problematic process :) I saved it
>> two times from the same process, as Michal suggested (i wasn't able to
>> take more). Here it is:
>> 
>> First (doesn't look very helpfull):
>> [<ffffffffffffffff>] 0xffffffffffffffff
>
>No it is not.
> 
>> Second:
>> [<ffffffff810e17d1>] shrink_zone+0x481/0x650
>> [<ffffffff810e2ade>] do_try_to_free_pages+0xde/0x550
>> [<ffffffff810e310b>] try_to_free_pages+0x9b/0x120
>> [<ffffffff81148ccd>] free_more_memory+0x5d/0x60
>> [<ffffffff8114931d>] __getblk+0x14d/0x2c0
>> [<ffffffff8114c973>] __bread+0x13/0xc0
>> [<ffffffff811968a8>] ext3_get_branch+0x98/0x140
>> [<ffffffff81197497>] ext3_get_blocks_handle+0xd7/0xdc0
>> [<ffffffff81198244>] ext3_get_block+0xc4/0x120
>> [<ffffffff81155b8a>] do_mpage_readpage+0x38a/0x690
>> [<ffffffff81155ffb>] mpage_readpages+0xfb/0x160
>> [<ffffffff811972bd>] ext3_readpages+0x1d/0x20
>> [<ffffffff810d9345>] __do_page_cache_readahead+0x1c5/0x270
>> [<ffffffff810d9411>] ra_submit+0x21/0x30
>> [<ffffffff810cfb90>] filemap_fault+0x380/0x4f0
>> [<ffffffff810ef908>] __do_fault+0x78/0x5a0
>> [<ffffffff810f2b24>] handle_pte_fault+0x84/0x940
>> [<ffffffff810f354a>] handle_mm_fault+0x16a/0x320
>> [<ffffffff8102715b>] do_page_fault+0x13b/0x490
>> [<ffffffff815cb87f>] page_fault+0x1f/0x30
>> [<ffffffffffffffff>] 0xffffffffffffffff
>
>This is the direct reclaim path. You are simply running out of memory
>globaly. There is no memcg specific code in that trace.


No, i'm not. Here is htop and server graphs from this case:
http://watchdog.sk/lkml/htop3.jpg (here you can see actual memory usage)
http://watchdog.sk/lkml/server01.jpg

If i was really having global OOM (which i'm not for 101%) where that i/o comes from? I have no swap.
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