linux-kernel - Re: 2.6.19-rc1-mm1+ memory problem

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Date:	Sun, 26 Nov 2006 00:53:19 +0300
From:	Michael Raskin <a1d23ab4@...l.ru>
To:	linux-kernel@...r.kernel.org
CC:	Andrew Morton <akpm@...l.org>
Subject: Re: 2.6.19-rc1-mm1+ memory problem

Andrew Morton wrote:
>> 89361 times:
>> Page allocated via order 0, mask 0x280d2
>> [0xc0159f31] __handle_mm_fault+1809
>> [0xc011318a] do_page_fault+314
>> [0xc04111c4] error_code+116
>> Can be anything. But if I understand anything, this memory is used 
>> because someone has requested a page that is swapped out. So the memory 
>> must be used, but not reflected in meminfo, and not by a process?

> What you should do is to cause the system to free as many pages as possible
> before looking ad /proc/page_owner.  For example, build `usemem' from
> http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz, run
> 
> 	usemem -m N  (where N is the number of megabytes which the machine has)
> 
> a couple of times.  Then check /proc/meminfo, and look to see which pages
> are left over in /proc/page_owner.

Well, I was too lazy to get this utility, used my own to allocate and 
fill enough memory as to go some 50MB to deep swap (Did I understand 
correctly what usemem does?). Top 3 did not change, except for exact 
numbers.
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