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| Started by | Jiri Olsa <jolsa@redhat.com> |
|---|---|
| First post | 2015-08-13 09:20 +0200 |
| Last post | 2015-08-17 16:00 +0200 |
| Articles | 4 — 3 participants |
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[PATCH] perf script: Initialize callchain_param.record_mode Jiri Olsa <jolsa@redhat.com> - 2015-08-13 09:20 +0200
Re: [PATCH] perf script: Initialize callchain_param.record_mode Milian Wolff <milian.wolff@kdab.com> - 2015-08-13 11:00 +0200
Re: [PATCH] perf script: Initialize callchain_param.record_mode Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-17 15:50 +0200
Re: [PATCH] perf script: Initialize callchain_param.record_mode Milian Wolff <milian.wolff@kdab.com> - 2015-08-17 16:00 +0200
| From | Jiri Olsa <jolsa@redhat.com> |
|---|---|
| Date | 2015-08-13 09:20 +0200 |
| Subject | [PATCH] perf script: Initialize callchain_param.record_mode |
| Message-ID | <pWUXU-4He-1@gated-at.bofh.it> |
On Wed, Jul 22, 2015 at 08:48:40PM +0200, Milian Wolff wrote:
> Hey all,
>
> I recorded a perf data file using
>
> perf record --call-graph dwarf kwrite <some large file>
>
> when I report it I see backtraces pointing to the user space code:
>
> perf report --stdio -g graph --no-children
> 16.36% kwrite libKF5TextEditor.so.5.13.0 [.]
> QArrayData::data
> |
> ---QArrayData::data
> |
> |--15.46%-- QTypedArrayData<unsigned short>::data
>
> but when I run perf script, I do not see _any_ backtraces into user space.
>
> perf script -F comm,tid,time,event,ip,sym,trace,period
> :4898 4898 17486.943365: 1 cycles:
> 25f83a native_write_msr_safe
> 234f8a __intel_pmu_enable_all
> 235010 intel_pmu_enable_all
> 22e1ec x86_pmu_enable
> 356fb7 perf_pmu_enable.part.53
> 35824d perf_event_context_sched_in.isra.64
> 358e0b perf_event_exec
> 3e8c93 setup_new_exec
> 439a9f load_elf_binary
> 3e7f48 search_binary_handler
> 3e89cf do_execveat_common.isra.15
> 3e8e4a sys_execve
> 78b895 return_from_execve
>
> kwrite 4898 17486.943893: 1 cycles:
> kwrite 4898 17486.944211: 1 cycles:
> ...
> kwrite 4898 17486.953664: 461703 cycles:
> kwrite 4898 17486.953838: 490150 cycles:
> 78d4c0 page_fault
> kwrite 4898 17486.954009: 516694 cycles:
> ...
> kwrite 4898 17510.765568: 766937 cycles:
> 78979b down_write
> 39bd82 unlink_file_vma
> 3944d0 free_pgtables
> 39eef6 exit_mmap
> 275d45 mmput
> 27b514 do_exit
> 27bdfb do_group_exit
> 27be84 [unknown]
> 78b56e system_call
>
> So it looks to me as if only kernel-space call stacks are unwound in perf
> script. Is there a magic switch that I'm missing to get user-space stacks
> unwound? Note I'm using perf 4.1.0 on a Linux 4.1.2 system.
hi,
right you are.. does attached patch help?
thanks,
jirka
---
Milian Wolff reported non functional DWARF unwind under perf
script. The reason is that perf script does not properly configure
callchain_param.record_mode, which is needed by unwind code.
Stealing the code from report and leaving the place for
more initialization code in a hope we could merge it with
report__setup_sample_type one day.
Reported-by: Milian Wolff <mail@milianw.de>
Link: http://lkml.kernel.org/n/tip-vtgxy0tv3gogvomyhc2c50rm@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/builtin-script.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 7b376d215e94..105332e950a9 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1561,6 +1561,22 @@ static int have_cmd(int argc, const char **argv)
return 0;
}
+static void script__setup_sample_type(struct perf_script *script)
+{
+ struct perf_session *session = script->session;
+ u64 sample_type = perf_evlist__combined_sample_type(session->evlist);
+
+ if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain) {
+ if ((sample_type & PERF_SAMPLE_REGS_USER) &&
+ (sample_type & PERF_SAMPLE_STACK_USER))
+ callchain_param.record_mode = CALLCHAIN_DWARF;
+ else if (sample_type & PERF_SAMPLE_BRANCH_STACK)
+ callchain_param.record_mode = CALLCHAIN_LBR;
+ else
+ callchain_param.record_mode = CALLCHAIN_FP;
+ }
+}
+
int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
{
bool show_full_info = false;
@@ -1849,6 +1865,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
goto out_delete;
script.session = session;
+ script__setup_sample_type(&script);
session->itrace_synth_opts = &itrace_synth_opts;
--
2.4.3
--
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| From | Milian Wolff <milian.wolff@kdab.com> |
|---|---|
| Date | 2015-08-13 11:00 +0200 |
| Message-ID | <pWWwH-6LA-31@gated-at.bofh.it> |
| In reply to | #1206549 |
[Multipart message — attachments visible in raw view] — view raw
On Thursday, August 13, 2015 09:17:24 AM Jiri Olsa wrote: > On Wed, Jul 22, 2015 at 08:48:40PM +0200, Milian Wolff wrote: > > Hey all, > > > > I recorded a perf data file using > > > > perf record --call-graph dwarf kwrite <some large file> > > > > when I report it I see backtraces pointing to the user space code: > > > > perf report --stdio -g graph --no-children > > > > 16.36% kwrite libKF5TextEditor.so.5.13.0 [.] > > > > QArrayData::data > > > > ---QArrayData::data > > > > |--15.46%-- QTypedArrayData<unsigned short>::data > > > > but when I run perf script, I do not see _any_ backtraces into user space. > > > > perf script -F comm,tid,time,event,ip,sym,trace,period > > > > :4898 4898 17486.943365: 1 cycles: > > 25f83a native_write_msr_safe > > 234f8a __intel_pmu_enable_all > > 235010 intel_pmu_enable_all > > 22e1ec x86_pmu_enable > > 356fb7 perf_pmu_enable.part.53 > > 35824d perf_event_context_sched_in.isra.64 > > 358e0b perf_event_exec > > 3e8c93 setup_new_exec > > 439a9f load_elf_binary > > 3e7f48 search_binary_handler > > 3e89cf do_execveat_common.isra.15 > > 3e8e4a sys_execve > > 78b895 return_from_execve > > > > kwrite 4898 17486.943893: 1 cycles: > > kwrite 4898 17486.944211: 1 cycles: > > ... > > kwrite 4898 17486.953664: 461703 cycles: > > > > kwrite 4898 17486.953838: 490150 cycles: > > 78d4c0 page_fault > > > > kwrite 4898 17486.954009: 516694 cycles: > > ... > > > > kwrite 4898 17510.765568: 766937 cycles: > > 78979b down_write > > 39bd82 unlink_file_vma > > 3944d0 free_pgtables > > 39eef6 exit_mmap > > 275d45 mmput > > 27b514 do_exit > > 27bdfb do_group_exit > > 27be84 [unknown] > > 78b56e system_call > > > > So it looks to me as if only kernel-space call stacks are unwound in perf > > script. Is there a magic switch that I'm missing to get user-space stacks > > unwound? Note I'm using perf 4.1.0 on a Linux 4.1.2 system. > > hi, > right you are.. does attached patch help? <snip> Hey Jiri, it works a treat! Many thanks, much appreciated. -- Milian Wolff | milian.wolff@kdab.com | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts
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| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2015-08-17 15:50 +0200 |
| Message-ID | <pYsXw-va-15@gated-at.bofh.it> |
| In reply to | #1206622 |
Em Thu, Aug 13, 2015 at 10:53:36AM +0200, Milian Wolff escreveu: > On Thursday, August 13, 2015 09:17:24 AM Jiri Olsa wrote: > > right you are.. does attached patch help? > > <snip> > > Hey Jiri, > > it works a treat! > > Many thanks, much appreciated. Adding a "Tested-by: Milian", Ok? - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Milian Wolff <milian.wolff@kdab.com> |
|---|---|
| Date | 2015-08-17 16:00 +0200 |
| Message-ID | <pYt7c-Gw-15@gated-at.bofh.it> |
| In reply to | #1208600 |
On Monday, August 17, 2015 10:47:50 AM CEST Arnaldo Carvalho de Melo wrote: > Em Thu, Aug 13, 2015 at 10:53:36AM +0200, Milian Wolff escreveu: > > On Thursday, August 13, 2015 09:17:24 AM Jiri Olsa wrote: > > > right you are.. does attached patch help? > > > > <snip> > > > > Hey Jiri, > > > > it works a treat! > > > > Many thanks, much appreciated. > > Adding a "Tested-by: Milian", Ok? Sure, please go ahead. Thanks -- Milian Wolff | milian.wolff@kdab.com | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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