* perf_guest default bug
@ 2012-03-02 19:00 David Ahern
2012-03-03 14:04 ` Arnaldo Carvalho de Melo
0 siblings, 1 reply; 4+ messages in thread
From: David Ahern @ 2012-03-02 19:00 UTC (permalink / raw
To: Arnaldo Carvalho de Melo, LKML; +Cc: Ingo Molnar
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
David
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: perf_guest default bug
2012-03-02 19:00 perf_guest default bug David Ahern
@ 2012-03-03 14:04 ` Arnaldo Carvalho de Melo
2012-03-03 15:19 ` Arnaldo Carvalho de Melo
0 siblings, 1 reply; 4+ messages in thread
From: Arnaldo Carvalho de Melo @ 2012-03-03 14:04 UTC (permalink / raw
To: David Ahern; +Cc: LKML, Ingo Molnar
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?
- Arnaldo
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: perf_guest default bug
2012-03-03 14:04 ` Arnaldo Carvalho de Melo
@ 2012-03-03 15:19 ` Arnaldo Carvalho de Melo
0 siblings, 0 replies; 4+ messages in thread
From: Arnaldo Carvalho de Melo @ 2012-03-03 15:19 UTC (permalink / raw
To: David Ahern; +Cc: LKML, Ingo Molnar
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@sandy 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
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: perf_guest default bug
@ 2012-03-03 15:29 David Ahern
0 siblings, 0 replies; 4+ messages in thread
From: David Ahern @ 2012-03-03 15:29 UTC (permalink / raw
To: Arnaldo Carvalho de Melo; +Cc: LKML, Ingo Molnar
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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@ghostprotocols.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@sandy 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
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^ permalink raw reply [flat|nested] 4+ messages in thread
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2012-03-03 14:04 ` Arnaldo Carvalho de Melo
2012-03-03 15:19 ` Arnaldo Carvalho de Melo
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2012-03-03 15:29 David Ahern
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