linux-kernel - Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1)

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Message-ID: <566AE54B.1010702@gmail.com>
Date:	Fri, 11 Dec 2015 08:01:31 -0700
From:	David Ahern <dsahern@...il.com>
To:	Ingo Molnar <mingo@...nel.org>, Namhyung Kim <namhyung@...il.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1)

On 12/11/15 1:11 AM, Ingo Molnar wrote:
>
> * Namhyung Kim <namhyung@...il.com> wrote:
>
>> IIRC David said that thread per cpu seems too much especially on a large system
>> (like ~1024 cpu). [...]
>
> Too much in what fashion? For recording I think it's the fastest, most natural
> model - anything else will create cache line bounces.

The intrusiveness of perf on the system under observation. I understand 
there are a lot of factors that go into it.
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