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From: David Ahern <dsahern@gmail.com>
To: Tim Blechmann <tim@klingt.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
	linux-kernel@vger.kernel.org
Subject: Re: [2.6.39-rc2] perf top fails to mmap
Date: Wed, 06 Apr 2011 16:15:44 -0600	[thread overview]
Message-ID: <4D9CE610.4020603@gmail.com> (raw)
In-Reply-To: <201104062248.23853.tim@klingt.org>



On 04/06/11 14:48, Tim Blechmann wrote:
>>> David
>>>
>>>> this happens when running perf as the same process as the process and
>>>> when running perf as root.
>>
>> yep, works for me as well:
>>
>> [acme@emilia ~]$ cat vsyscall.c
> 
> after including unistd.h, this compiles and works fine. however i cannot profile 
> any multithreaded program. does this work for you?
> 
> tim
> 

That does fail:
# ps -C rsyslogd -L
  PID   LWP TTY          TIME CMD
  795   795 ?        00:00:00 rsyslogd
  795   797 ?        00:00:00 rsyslogd
  795   798 ?        00:00:00 rsyslogd

# /tmp/build-perf/perf top -p 795
Failed to mmap with 22 (Invalid argument)

strace shows it failing at:
ioctl(4, PERF_EVENT_IOC_SET_OUTPUT, 0x3) = -1 EINVAL (Invalid argument)

Changing to use thread only works:
# /tmp/build-perf/perf top -t 795

  reply	other threads:[~2011-04-06 22:15 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-06 10:51 [2.6.39-rc2] perf top fails to mmap Tim Blechmann
2011-04-06 15:20 ` David Ahern
2011-04-06 17:52   ` Arnaldo Carvalho de Melo
2011-04-06 20:48     ` Tim Blechmann
2011-04-06 22:15       ` David Ahern [this message]
2011-04-06 22:45         ` [2.6.39-rc2] perf top fails to mmap - bisected to 70db7533 David Ahern
2011-04-07  0:13           ` Arnaldo Carvalho de Melo
2011-04-22 16:37           ` David Ahern
2011-04-23 13:45             ` Lin Ming
     [not found]               ` <BANLkTikWpnnHAfO2n2rN6ExtQyrsVaiqEQ@mail.gmail.com>
2011-04-23 14:51                 ` Lin Ming
2011-04-24 11:47                   ` Tim Blechmann
2011-04-24 13:45                     ` David Ahern
2011-04-24 15:02                       ` Lin Ming

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