From: David Ahern <dsahern@gmail.com>
To: Ingo Molnar <mingo@kernel.org>, Namhyung Kim <namhyung@gmail.com>
Cc: Namhyung Kim <namhyung@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: Fri, 11 Dec 2015 08:01:31 -0700 [thread overview]
Message-ID: <566AE54B.1010702@gmail.com> (raw)
In-Reply-To: <20151211081141.GA21600@gmail.com>
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.
next prev parent reply other threads:[~2015-12-11 15:01 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 [this message]
2015-12-14 1:12 ` Namhyung Kim
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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