linux-kernel - Re: [PATCH] perf-record: Create events initially disabled -- again

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Date:	Mon, 14 May 2012 08:21:02 -0600
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung.kim@....com>
CC:	acme@...stprotocols.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf-record: Create events initially disabled -- again

On 5/14/12 7:09 AM, David Ahern wrote:
>> A problem I see is that it'll break group handling again:
>>
>> $ ./perf stat -g sleep 1
>>
>> Performance counter stats for 'sleep 1':
>>
>> <not counted> task-clock
>> <not counted> context-switches
>> <not counted> CPU-migrations
>> <not counted> page-faults
>> <not counted> cycles
>> <not counted> stalled-cycles-frontend
>> <not counted> stalled-cycles-backend
>> <not counted> instructions
>> <not counted> branches
>> <not counted> branch-misses
>>
>> 1.000868932 seconds time elapsed
>>
>> So I suggest changing perf_target__none() check to a proper one
>> (perf_target__no_cpu? - the name might be changed soon) for your
>> purpose.
>>
>> Thanks,
>> Namhyung
>
> Something else is wrong then. I tested that command (saw your patch in
> the history) and it worked for me. Also, this code path does not affect
> perf-stat -- it touches perf-record and perf-test only.

I think it is something else. I am running latest git tree (3.4.0-rc7). 
perf from Linus' tree and acme/core both show:

perf stat -g  -- find /usr >/dev/null

  Performance counter stats for 'find /usr':

      <not counted> task-clock
      <not counted> context-switches
      <not counted> CPU-migrations
      <not counted> page-faults
      <not counted> cycles
      <not counted> stalled-cycles-frontend
      <not counted> stalled-cycles-backend
      <not counted> instructions
      <not counted> branches
      <not counted> branch-misses

        0.111976940 seconds time elapsed


(Using find to make sure some work is done as opposed to sleep; openssl 
speed also shows the above.)

David
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