kernel-packages team mailing list archive

[Mark Nelson <Mark.A.Nelson@xxxxxxxxx>]

jtaylor:

Yep, this is saucy.  Just upgraded  in fact for the newer stock kernel
and hoping that dwarf support would be there. :)

I work on Ceph at Inktank and there are times when we are debugging
customer clusters with stock kernels where having unwind support in perf
would be very useful.  It would be especially nice if we could get it
working before 14.04 lands as I expect a lot of people will be
standardizing on that in the future.

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https://bugs.launchpad.net/bugs/1248289

Title:
  Missing libunwind support in perf

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  Hi,

  I'm trying to use perf's libunwind support in 13.04 with kernel
  3.11.0-12-generic on amd64.  Typically you can do this by using the
  "-g dwarf" flag, but it appears the perf command included in linux-
  tools-3.11.0-12-generic was not compiled with libunwind.  This may be
  as simple as the build machine didn't have libunwind installed.
  Having dwarf support in perf with default Ubuntu kernels would be very
  useful as it provides a way to get profiling information when
  -fomitframepointer is used.

  Relevant upstream code:

  https://github.com/torvalds/linux/blob/v3.11/tools/perf/Makefile#L459
  https://github.com/torvalds/linux/blob/v3.11/tools/perf/builtin-record.c#L758

  Let me know if I can provide any other information.

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