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

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Message-ID: <20151211081141.GA21600@gmail.com>
Date:	Fri, 11 Dec 2015 09:11:41 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	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>,
	David Ahern <dsahern@...il.com>,
	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)


* 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.

For perf report, I suspect you are right, it would depend on the actual possible 
parallelism - which with time would improve I suspect.

Thanks,

	Ingo
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