linux-kernel - Re: perf_guest default bug

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Date:	Sat, 03 Mar 2012 08:29:25 -0700
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: perf_guest default bug

Right. And Ingo committed the kernel side patch. I can only recall those 3 fixes at the moment (first sips into the first cup of coffee :-)).

David

Sent from my ASUS Eee Pad

Arnaldo Carvalho de Melo <acme@...stprotocols.net> wrote:

>Em Sat, Mar 03, 2012 at 11:04:05AM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Fri, Mar 02, 2012 at 12:00:01PM -0700, David Ahern escreveu:
>> > Similar to my last email, this patch is not in urgent trees or
>> > Linus' yet the problem exists in Linus' tree:
>> > https://lkml.org/lkml/2012/2/17/82
>> > 
>> > $ /tmp/pbuild/perf record -a  -- sleep 1
>> > [ perf record: Woken up 1 times to write data ]
>> > [ perf record: Captured and wrote 0.319 MB perf.data (~13935 samples) ]
>> > Segmentation fault
>> > 
>> > Root cause is the perf_guest setting.
>> > 
>> > $ /tmp/pbuild/perf --version
>> > perf version 3.3.rc5.60.g203738
>> 
>> This one was tricky, IIRC, weren't follow up patches needed to plug some
>> extra problems?
>
>Yeah, just trying cherry picking it and trying it on an RHEL6.2 kernel
>and it didn't work because older kernels don't have
>attr.exclude_{guest,host}, so I had to also cherrypick:
>
>[acme@...dy linux]$ git cherry-pick
>0c9781280fb672ca09c997df3f14ba506bbdb977
>Finished one cherry-pick.
>[perf/urgent b5f81a4] perf tools: Handle kernels that don't support attr.exclude_{guest,host}
>
>- Arnaldo