linux-kernel - Re: [PATCH] Add munmap events to perf

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Message-ID: <1277810866.1868.32.camel@laptop>
Date:	Tue, 29 Jun 2010 13:27:46 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Eric B Munson <ebmunson@...ibm.com>
Cc:	mingo@...e.hu, paulus@...ba.org, acme@...hat.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Anton Blanchard <anton@...ba.org>
Subject: Re: [PATCH] Add munmap events to perf

On Tue, 2010-06-29 at 09:33 +0100, Eric B Munson wrote:
> On Mon, 28 Jun 2010, Peter Zijlstra wrote:
> 
> > On Mon, 2010-06-28 at 19:08 +0100, Eric B Munson wrote:
> > > This patch adds a new software event for munmaps.  It will allows
> > > users to profile changes to address space.  munmaps will be tracked
> > > with mmaps.
> > 
> > Why?
> > 
> 
> It is going to be used by a tool that will model memory usage over the
> lifetime of a process.

Wouldn't it be better to use some tracepoints for that instead? I want
to keep the sideband data to a minimum required to interpret the sample
data, and you don't need unmap events for that.


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