perf_guest default bug
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
Em Fri, Mar 02, 2012 at 12:00:01PM -0700, David Ahern escreveu:
Quoted 9 lines
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
Quoted 4 lines
Root cause is the
perf_guestsetting.$ /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
Em Sat, Mar 03, 2012 at 11:04:05AM -0300, Arnaldo Carvalho de Melo escreveu:
Quoted 10 lines
Em Fri, Mar 02, 2012 at 12:00:01PM -0700, David Ahern escreveu:
Quoted 9 lines
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
Quoted 7 lines
Quoted 4 lines
Root cause is the
perf_guestsetting.$ /tmp/pbuild/perf --version perf version 3.3.rc5.60.g203738This 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-pick0c9781280fb672ca09c997df3f14ba506bbdb977
Finished one cherry-pick.
[perf/urgent b5f81a4] perf tools: Handle kernels that don't support attr.exclude_{guest,host}
- Arnaldo