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From: David Ahern <dsahern@gmail.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: mingo@redhat.com, hpa@zytor.com, paulus@samba.org,
	linux-kernel@vger.kernel.org, acme@redhat.com,
	fweisbec@gmail.com, peterz@infradead.org, tglx@linutronix.de,
	linux-tip-commits@vger.kernel.org,
	Stephane Eranian <eranian@google.com>
Subject: Re: [tip:perf/core] perf tools: Allow multiple threads or processes in record, stat, top
Date: Fri, 02 Mar 2012 07:52:16 -0700	[thread overview]
Message-ID: <4F50DEA0.2020607@gmail.com> (raw)
In-Reply-To: <20120302105620.GA21762@elte.hu>

That first cup of coffee is so important.

On 3/2/12 3:56 AM, Ingo Molnar wrote:
> phoenix:~>  perf record -a sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.023 MB perf.data (~988 samples) ]
> phoenix:~>  perf report --stdio
> Warning:
> The perf.data file has no samples!
> # ========
> # captured on: Fri Mar  2 12:01:41 2012
> # hostname : phoenix
> # os release : 3.3.0-rc5+
> # perf version : 3.3.rc5.1698.g68a63a.dirty
> # arch : x86_64
> # nrcpus online : 16
> # nrcpus avail : 16
> # cpudesc : Quad-Core AMD Opteron(tm) Processor 8356
> # cpuid : AuthenticAMD,16,2,3

Would you mind adding this patch:
   https://lkml.org/lkml/2012/2/29/217
and see if it fixes your problem?

Quick test with an updated tree:
$ /tmp/pbuild/perf record -a sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.046 MB perf.data (~1990 samples) ]

$ /tmp/pbuild/perf script
<samples dumped>

$ /tmp/pbuild/perf --version
perf version perf.core.for.mingo.36.g8eedce

This is your tip.git repository, tip/perf/core branch:

[remote "tip"]
     url = git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
     fetch = +refs/heads/*:refs/remotes/tip/*
[branch "tip-perf-core"]
     remote = tip
     merge = refs/heads/perf/core

I did noticed that this branch only shows 3.3.0-rc2 as the latest kernel 
version.

> # total memory : 33012240 kB
> # cmdline : /home/mingo/bin/perf record -a sleep 1
> # event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_k
> # HEADER_CPU_TOPOLOGY info available, use -I to display
> # HEADER_NUMA_TOPOLOGY info available, use -I to display
> # ========
> phoenix:~>  perf --version
> perf version 3.3.rc5.1698.g68a63a.dirty
> phoenix:~>
>
> The later fixes to b52956c9, such as:
>
>    6b1bee9035d4: perf tools: fix broken perf record -a mode
>
> did not fix this system - it's still broken as of today's -tip.
>
> Another system running the same kernel does not exhibit this
> problem, so it's somehow specific to this system.

Is the other system Intel based?

David

  parent reply	other threads:[~2012-03-02 14:52 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-08 16:32 [PATCH] perf tools: Allow multiple threads or processes in record, stat, top David Ahern
2012-02-09  1:19 ` Namhyung Kim
2012-02-09  2:52   ` David Ahern
2012-02-09  5:36     ` Namhyung Kim
2012-02-09  6:04       ` David Ahern
2012-02-09  7:37     ` Ingo Molnar
2012-02-09 14:34       ` Arnaldo Carvalho de Melo
2012-02-09 14:44         ` Arnaldo Carvalho de Melo
2012-02-10  5:42           ` Namhyung Kim
2012-02-10 14:28             ` Arnaldo Carvalho de Melo
2012-02-12 10:45               ` [PATCH] perf tools: Fix build dependency of perf python extension Namhyung Kim
2012-02-17  9:44                 ` [tip:perf/core] " tip-bot for Namhyung Kim
2012-02-10 19:24 ` [PATCH] perf tools: Allow multiple threads or processes in record, stat, top Arnaldo Carvalho de Melo
2012-02-10 19:32   ` David Ahern
2012-02-10 19:34     ` Arnaldo Carvalho de Melo
2012-02-10 19:46       ` David Ahern
2012-02-10 19:58         ` Arnaldo Carvalho de Melo
2012-02-17  9:46 ` [tip:perf/core] " tip-bot for David Ahern
2012-03-02 10:56   ` Ingo Molnar
2012-03-02 14:21     ` David Ahern
2012-03-02 14:52     ` David Ahern [this message]
2012-03-03  7:42       ` Ingo Molnar

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