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From: Namhyung Kim <namhyung@kernel.org>
To: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Jiri Olsa <jolsa@redhat.com>, LKML <linux-kernel@vger.kernel.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Andi Kleen <andi@firstfloor.org>,
	Stephane Eranian <eranian@google.com>,
	Adrian Hunter <adrian.hunter@intel.com>
Subject: Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1)
Date: Mon, 14 Dec 2015 10:12:21 +0900	[thread overview]
Message-ID: <20151214011221.GA9568@danjae.kornet> (raw)
In-Reply-To: <566AE54B.1010702@gmail.com>

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@gmail.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

  reply	other threads:[~2015-12-14  1:13 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-10  7:53 [PATCHSET 00/16] perf top: Add multi-thread support (v1) Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 01/16] perf top: Delete half-processed hist entries when exit Namhyung Kim
2015-12-10  9:55   ` 平松雅巳 / HIRAMATU，MASAMI
2015-12-10 18:57     ` Arnaldo Carvalho de Melo
2015-12-14  8:15   ` [tip:perf/core] " tip-bot for Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 02/16] perf top: Fix and cleanup perf_top__record_precise_ip() Namhyung Kim
2015-12-10 19:04   ` Arnaldo Carvalho de Melo
2015-12-11  2:27     ` Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 03/16] perf top: Factor out warnings about kernel addresses and symbols Namhyung Kim
2015-12-10 19:07   ` Arnaldo Carvalho de Melo
2015-12-14  1:44     ` Namhyung Kim
2015-12-14  2:02       ` Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 04/16] perf top: Factor out warnings in perf_top__record_precise_ip() Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 05/16] perf top: Show warning messages in the display thread Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 06/16] perf top: Get rid of access to hists->lock in perf_top__record_precise_ip() Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 07/16] perf hists: Pass hists struct to hist_entry_iter struct Namhyung Kim
2015-12-13 23:15   ` Jiri Olsa
2015-12-14  1:45     ` Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 08/16] perf tools: Export a couple of hist functions Namhyung Kim
2015-12-13 23:17   ` Jiri Olsa
2015-12-10  7:53 ` [PATCH/RFC 09/16] perf tools: Update hist entry's hists pointer Namhyung Kim
2015-12-13 23:23   ` Jiri Olsa
2015-12-13 23:28     ` Jiri Olsa
2015-12-14  1:51       ` Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 10/16] perf hist: Add events_stats__add() and hists__add_stats() Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 11/16] perf top: Implement basic parallel processing Namhyung Kim
2015-12-14  9:23   ` Jiri Olsa
2015-12-14  9:35     ` Jiri Olsa
2015-12-15  2:08       ` Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 12/16] perf tools: Reduce lock contention when processing events Namhyung Kim
2015-12-14  8:43   ` Jiri Olsa
2015-12-15  2:03     ` Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 13/16] perf top: Protect the seen list using mutex Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 14/16] perf top: Separate struct perf_top_stats Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 15/16] perf top: Add --num-thread option Namhyung Kim
2015-12-10  7:53 ` [PATCH/RFC 16/16] perf tools: Skip dso front cache for multi-threaded lookup Namhyung Kim
2015-12-10  8:01 ` [PATCHSET 00/16] perf top: Add multi-thread support (v1) Ingo Molnar
2015-12-10  8:49   ` Namhyung Kim
2015-12-11  8:11     ` Ingo Molnar
2015-12-11 15:01       ` David Ahern
2015-12-14  1:12         ` Namhyung Kim [this message]
2015-12-14  9:26         ` Peter Zijlstra
2015-12-14  9:38           ` Ingo Molnar
2015-12-14 14:55             ` David Ahern
2015-12-14 16:26               ` Arnaldo Carvalho de Melo
2015-12-14 16:41                 ` Peter Zijlstra
2015-12-14 17:52                   ` Arnaldo Carvalho de Melo
2015-12-14 16:38             ` Namhyung Kim
2015-12-14 16:56               ` Peter Zijlstra
2015-12-14 17:11                 ` Namhyung Kim
2015-12-14 14:46           ` David Ahern
2015-12-14 17:06             ` Namhyung Kim
2015-12-14 17:54               ` Arnaldo Carvalho de Melo
2015-12-14 16:25           ` Namhyung Kim
2015-12-14 16:44             ` Peter Zijlstra

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