linux-kernel - Re: [RFC][PATCH 1/2] perf: Add 'perf kmem' tool

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Message-ID: <4B067007.8070607@cs.helsinki.fi>
Date:	Fri, 20 Nov 2009 12:31:35 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Li Zefan <lizf@...fujitsu.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [RFC][PATCH 1/2] perf: Add 'perf kmem' tool

Ingo Molnar kirjoitti:
> * Pekka Enberg <penberg@...helsinki.fi> wrote:
> 
>> Hi Ingo,
>>
>> On Fri, Nov 20, 2009 at 11:01 AM, Ingo Molnar <mingo@...e.hu> wrote:
>>> But ... even without that, perf is really fast and is supposed to build
>>> fine even in minimal (embedded) environments, so you can run it on the
>>> embedded board too. That's useful to get live inspection features like
>>> 'perf top', 'perf stat' and 'perf probe' anyway.
>> Maybe I'm just too damn lazy but if I don't go through the trouble of
>> building my kernel on the box, I sure don't want to do that for perf
>> either. [...]
> 
> Well you'll need 'perf' on that box anyway, to be able to do 'perf kmem 
> record'.

/me turns brains on

You're right, of course. With kmemtrace-user, I just copied the raw 
trace file from /sys/kernel. I wonder if that's a good enough reason to 
keep kmemtrace bits around?

			Pekka
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