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Groups > linux.kernel > #1271944
| From | Jiri Olsa <jolsa@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction |
| Date | 2015-11-18 09:50 +0100 |
| Message-ID | <qw6Bc-vx-11@gated-at.bofh.it> (permalink) |
| References | <qw5lL-8cX-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, Nov 18, 2015 at 03:20:36PM +0800, Wangnan (F) wrote:
SNIP
>
> Then use perf to trace it:
>
> # ./pref record -g -F 9 --call-graph dwarf ./test_dwarf_unwind
> # ./perf report --no-children --stdio
> ...
> 1.23% test_dwarf_unwi test_dwarf_unwind [.] funcc
> |
> ---funcc
> |
> |--0.62%-- funcb
> | funca
> | main
> | __libc_start_main
> | _start
> |
> --0.62%-- 0 <-- I applied Jiri's patch in [1] so see this
> 0,
> which indicates a broken call chain.
can't see this case after multiple running your test,
just the 'end-of-the-callchain' zeros
49.14% test_dwarf_unwi [vdso] [.] __vdso_gettimeofday
|
---__vdso_gettimeofday
funcc
funcb
funca
main
__libc_start_main
_start
0
40.78% test_dwarf_unwi [vdso] [.] 0x0000000000000987
|
---0x7ffe28ab7987
__vdso_gettimeofday
funcc
funcb
funca
main
__libc_start_main
_start
0
what kernel do you have?
jirka
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[BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction "Wangnan (F)" <wangnan0@huawei.com> - 2015-11-18 08:30 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction "Wangnan (F)" <wangnan0@huawei.com> - 2015-11-18 09:20 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction Ingo Molnar <mingo@kernel.org> - 2015-11-18 09:30 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction "Wangnan (F)" <wangnan0@huawei.com> - 2015-11-18 10:00 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction Ingo Molnar <mingo@kernel.org> - 2015-11-19 07:40 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction "Wangnan (F)" <wangnan0@huawei.com> - 2015-11-19 07:50 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction Ingo Molnar <mingo@kernel.org> - 2015-11-19 11:30 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction "Wangnan (F)" <wangnan0@huawei.com> - 2015-11-19 11:50 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction Peter Zijlstra <peterz@infradead.org> - 2015-11-19 12:30 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction Peter Zijlstra <peterz@infradead.org> - 2015-11-19 12:30 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction Ingo Molnar <mingo@kernel.org> - 2015-11-27 09:40 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction Peter Zijlstra <peterz@infradead.org> - 2015-11-30 10:30 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction "Wangnan (F)" <wangnan0@huawei.com> - 2015-11-18 10:10 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction Jiri Olsa <jolsa@redhat.com> - 2015-11-18 09:50 +0100
Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction "Wangnan (F)" <wangnan0@huawei.com> - 2015-11-18 10:20 +0100
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