linux-kernel - Re: [Patch] mm tracepoints update

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Message-Id: <1240428151.11613.46.camel@dhcp-100-19-198.bos.redhat.com>
Date:	Wed, 22 Apr 2009 15:22:31 -0400
From:	Larry Woodman <lwoodman@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	eduard.munteanu@...ux360.ro, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, riel@...hat.com, rostedt@...dmis.org
Subject: Re: [Patch] mm tracepoints update - use case.

On Wed, 2009-04-22 at 08:07 -0400, Larry Woodman wrote:
> On Wed, 2009-04-22 at 11:57 +0200, Ingo Molnar wrote:
> > * KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> > > In past thread, Andrew pointed out bare page tracer isn't useful. 
> > 
> > (do you have a link to that mail?)
> > 
> > > Can you make good consumer?
> 
> I will work up some good examples of what these are useful for.  I use
> the mm tracepoint data in the debugfs trace buffer to locate customer
> performance problems associated with memory allocation, deallocation,
> paging and swapping frequently, especially on large systems.
> 
> Larry

Attached is an example of what the mm tracepoints can be used for:



View attachment "usecase" of type "text/plain" (7276 bytes)