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

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Message-ID: <20151214011221.GA9568@danjae.kornet>
Date:	Mon, 14 Dec 2015 10:12:21 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Ingo Molnar <mingo@...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)

Hi David and Ingo,

On Fri, Dec 11, 2015 at 08:01:31AM -0700, David Ahern wrote:
> 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.

So what would be the sane default?  Do you have any other suggestion?

If there's no opinion, I'll follow Ingo's..

Thanks,
Namhyung
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