linux-kernel - Re: [PATCH v2 04/10] perf, tools, script: Allow sym and dso without ip, addr

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Date:   Mon, 3 Sep 2018 09:12:30 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Andi Kleen <andi@...stfloor.org>, acme@...nel.org,
        jolsa@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/10] perf, tools, script: Allow sym and dso without
 ip, addr

On Mon, Sep 03, 2018 at 09:15:10AM +0200, Jiri Olsa wrote:
> On Fri, Aug 31, 2018 at 03:02:00PM -0700, Andi Kleen wrote:
> > From: Andi Kleen <ak@...ux.intel.com>
> > 
> > Currently sym and dso require printing ip and addr because
> > the print function is tied to those outputs. With callindent
> > it makes sense to print the symbol or dso without numerical
> > IP or ADDR. So change the dependency check to only check the
> > underlying attribute.
> > 
> > This allows to remove a lot of noise in callindent output by
> > dropping the numerical addresses, which are not all that useful.
> > 
> > Before
> > 
> > % perf script --itrace=cr -F +callindent
> >          swapper     0 [000] 156546.354971:          1   branches: pt_config                                       0 [unknown] ([unknown]) => ffffffff81010486 pt_config ([kernel.kallsyms])
> >          swapper     0 [000] 156546.354971:          1   branches:     pt_config                    ffffffff81010499 pt_config ([kernel.kallsyms]) => ffffffff8101063e pt_event_add ([kernel.kallsyms])
> >          swapper     0 [000] 156546.354971:          1   branches:     pt_event_add                 ffffffff81010635 pt_event_add ([kernel.kallsyms]) => ffffffff8115e687 event_sched_in.isra.107 ([kernel.kallsyms])
> >          swapper     0 [000] 156546.354971:          1   branches:     perf_pmu_enable              ffffffff8115e726 event_sched_in.isra.107 ([kernel.kallsyms]) => ffffffff811579b0 perf_pmu_enable ([kernel.kallsyms])
> >          swapper     0 [000] 156546.354971:          1   branches:     perf_pmu_nop_void            ffffffff81151730 perf_pmu_nop_void ([kernel.kallsyms]) => ffffffff8115e72b event_sched_in.isra.107 ([kernel.kallsyms])
> >          swapper     0 [000] 156546.354971:          1   branches:     event_sched_in.isra.107      ffffffff8115e737 event_sched_in.isra.107 ([kernel.kallsyms]) => ffffffff8115e7a5 group_sched_in ([kernel.kallsyms])
> >          swapper     0 [000] 156546.354971:          1   branches:     __x86_indirect_thunk_rax     ffffffff8115e7f6 group_sched_in ([kernel.kallsyms]) => ffffffff81a03000 __x86_indirect_thunk_rax ([kernel.kallsyms])
> > 
> > After
> > 
> > % perf script --itrace=cr -F +callindent,-ip,-sym,-symoff
> >        swapper     0 [000] 156546.354971:          1   branches:  pt_config
> >          swapper     0 [000] 156546.354971:          1   branches:      pt_config
> >          swapper     0 [000] 156546.354971:          1   branches:      pt_event_add
> >          swapper     0 [000] 156546.354971:          1   branches:       perf_pmu_enable
> >          swapper     0 [000] 156546.354971:          1   branches:       perf_pmu_nop_void
> >          swapper     0 [000] 156546.354971:          1   branches:       event_sched_in.isra.107
> >          swapper     0 [000] 156546.354971:          1   branches:       __x86_indirect_thunk_rax
> >          swapper     0 [000] 156546.354971:          1   branches:       perf_pmu_nop_int
> >          swapper     0 [000] 156546.354971:          1   branches:       group_sched_in
> >          swapper     0 [000] 156546.354971:          1   branches:       event_filter_match
> >          swapper     0 [000] 156546.354971:          1   branches:       event_filter_match
> >          swapper     0 [000] 156546.354971:          1   branches:       group_sched_in
> 
> I'm getting different output than advertised
> 
> [jolsa@...va perf]$ ./perf script --itrace=cr -F +callindent,-ip,-sym,-symoff | head -3
>               ls  1926 [000] 55509.544711:          1 branches:uhH: _start                           =>     7f9722fa0f60 (/usr/lib64/ld-2.27.so)
>               ls  1926 [000] 55509.544711:          1 branches:uhH: _start                           =>                0 ([unknown])
>               ls  1926 [000] 55509.544716:          1 branches:uhH: _start                           =>     7f9722fa0f60 (/usr/lib64/ld-2.27.so)

Yes it needs the next patch too. There's no good way to show the effect independently.

I will merge them into one.

-Andi