kernel-packages team mailing list archive

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

Hi Tim,

Sorry to respond so late to this, hadn't seen your question earlier and
have been bogged down with holidays.  I've not seen -g dwarf work yet in
a stock ubuntu kernel, but have seen it work in custom kernel compiles.
Unfortunately I don't have any raring machines handy at the moment to
verify jtaylor's observation that it worked in the stock distribution
there.

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

Title:
  Missing libunwind support in perf

Status in “linux” package in Ubuntu:
  In Progress

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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