linux-kernel - Re: [PATCH 03/15 V3] perf c2c: Shared data analyser

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Date:	Wed, 09 Apr 2014 09:58:04 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	acme@...stprotocols.net, LKML <linux-kernel@...r.kernel.org>,
	jolsa@...hat.com, jmario@...hat.com, fowles@...each.com,
	peterz@...radead.org, eranian@...gle.com, andi.kleen@...el.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Richard Fowles <rfowles@...hat.com>
Subject: Re: [PATCH 03/15 V3] perf c2c: Shared data analyser

On Tue, 8 Apr 2014 10:22:26 -0400, Don Zickus wrote:
> On Tue, Apr 08, 2014 at 03:59:15PM +0900, Namhyung Kim wrote:
>> Hi Don,
>> 
>> On Mon, 24 Mar 2014 15:36:54 -0400, Don Zickus wrote:
>> > From: Arnaldo Carvalho de Melo <acme@...hat.com>
>> >
>> > This is the start of a new perf tool that will collect information about
>> > memory accesses and analyse it to find things like hot cachelines, etc.
>> 
>> So why not integrating this into existing 'perf mem' command if it's all
>> about analyzing memory accesses?
>
> Our expectations were different.  We expeted to do system-wide analysis
> with loads and stores.  With 'perf mem' you didn't have the ability to
> anlayze both load and stores at the same time.

But it's very simple to change perf mem to work with the both IMHO.

>
> In all my private conversations with Stephane, Arnalado and Jiri, it was
> never brought up.  We had just assumed that is made more sense to keep it
> separate.

Well, I'm not sure ;-)  Yes, the c2c is a complex tool which might
deserve an own command, but the functionality is very similar and I
guess there's something to share between them.

Thanks,
Namhyung
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