linux-kernel - Re: 3.4-rc4 oom killer out of control.

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Message-ID: <20120426215257.GA12908@redhat.com>
Date:	Thu, 26 Apr 2012 17:52:57 -0400
From:	Dave Jones <davej@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	linux-mm@...ck.org, Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 3.4-rc4 oom killer out of control.

On Thu, Apr 26, 2012 at 02:40:48PM -0700, David Rientjes wrote:
 > On Thu, 26 Apr 2012, Dave Jones wrote:
 > 
 > > On a test machine that was running my system call fuzzer, I just saw
 > > the oom killer take out everything but the process that was doing all
 > > the memory exhausting.
 > > 
 > 
 > Would it be possible to try the below patch?  It should kill the thread 
 > using the most memory (which happens to only be a couple more megabytes on 
 > your system), but it might just delay the inevitable since the system is 
 > still in a pretty bad state.
 > 
 > KOSAKI-san suggested doing this before and I think it's the best direction 
 > to go in anyway.

Sure, I'll give it a shot when I reboot.

However, see my follow-up message. I think there are two bugs here.
1) The over-aggressive oom-killer, and 2) ksmd going mental.

/sys/kernel/mm/ksm/full_scans is increasing constantly

full_scans: 146370
pages_shared: 1
pages_sharing: 4
pages_to_scan: 1250
pages_unshared: 867
pages_volatile: 1
run: 1
sleep_millisecs: 20

everything in /sys/kernel/mm/hugepages/hugepages-2048kB, is 0.

/sys/kernel/mm/transparent_hugepage/khugepaged:
alloc_sleep_millisecs  60000
defrag  1
full_scans  15
max_ptes_none 511 
pages_collapsed  6
pages_to_scan  4096
scan_sleep_millisecs 10000


	Dave

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