linux-kernel - Re: Very aggressive memory reclaim

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Date:	Tue, 29 Mar 2011 10:59:33 +0200
From:	Avi Kivity <avi@...hat.com>
To:	John Lepikhin <johnlepikhin@...il.com>
CC:	Dave Chinner <david@...morbit.com>, linux-kernel@...r.kernel.org,
	xfs@....sgi.com, linux-mm@...ck.org
Subject: Re: Very aggressive memory reclaim

On 03/29/2011 09:26 AM, John Lepikhin wrote:
> 2011/3/29 Dave Chinner<david@...morbit.com>:
>
> >  First it would be useful to determine why the VM is reclaiming so
> >  much memory. If it is somewhat predictable when the excessive
> >  reclaim is going to happen, it might be worth capturing an event
> >  trace from the VM so we can see more precisely what it is doiing
> >  during this event. In that case, recording the kmem/* and vmscan/*
> >  events is probably sufficient to tell us what memory allocations
> >  triggered reclaim and how much reclaim was done on each event.
>
> Do you mean I must add some debug to mm functions? I don't know any
> other way to catch such events.

Download and build trace-cmd 
(git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git), 
and do

$ trace-cmd record -e kmem -e vmscan -b 30000

Hit ctrl-C when done and post the output file generated in cwd.

-- 
error compiling committee.c: too many arguments to function

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