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

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Message-ID: <4B0657A4.2040606@cs.helsinki.fi>
Date:	Fri, 20 Nov 2009 10:47:32 +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:
> Regarding patch 2 - can we set some definitive benchmark threshold for 
> that? I.e. a list of must-have features in 'perf kmem' before we can do 
> it? 100% information and analysis equivalency with kmemtrace-user tool? 

I'd be interested to hear Eduard's comment on that.

That said, I'll try to find some time to test "perf kmem" and provide 
feedback on that. I can ACK the patch when I'm happy with the output. :-)

I'm mostly interested in two scenarios: (1) getting a nice report on 
worst fragmented call-sites (perf kmem needs symbol lookup) and (2) 
doing "perf kmem record" on machine A (think embedded here) and then 
"perf kmem report" on machine B. I haven't tried kmemtrace-user for a 
while but it did support both of them quite nicely at some point.

			Pekka
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