linux-kernel - Re: [Questions] perf c2c: What's the current status of perf c2c?

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Date:	Wed, 9 Dec 2015 11:48:21 -0800
From:	Stephane Eranian <eranian@...gle.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Yunlong Song <yunlong.song@...wei.com>,
	Don Zickus <dzickus@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Joe Mario <jmario@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Richard Fowles <rfowles@...hat.com>,
	"acme@...nel.org >> Arnaldo Carvalho de Melo" <acme@...nel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	"wangnan0@...wei.com >> Wang Nan" <wangnan0@...wei.com>,
	Richard Fowles <fowles@...each.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [Questions] perf c2c: What's the current status of perf c2c?

On Wed, Dec 9, 2015 at 9:21 AM, Andi Kleen <andi@...stfloor.org> wrote:
>> If I recall the c2c tool is giving you more than the bouncing line. It shows you
>> the offset inside the line and the participating CPUs.
>
> On Haswell and later you could get the same with the normal address
> reporting. The events above support DLA.
>
I know the events track the condition better than just with the
latency threshold.
I think what it boils down to is not so much the PMU side but  rather
the tool side.
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