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Message #64148
Re: [Bug 1248289] Re: Missing libunwind support in perf
in trusty the command line is: perf record --call-graph dwarf
compared to saucy dwarf support seems to work fine in trusty so this
issue can be closed.
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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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