linux-kernel - Re: [PATCH 1/2] perf report: Support --header-only for pipe mode

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Date:   Mon, 14 Dec 2020 10:22:11 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH 1/2] perf report: Support --header-only for pipe mode

Em Mon, Dec 14, 2020 at 12:00:19AM +0100, Jiri Olsa escreveu:
> On Thu, Dec 10, 2020 at 03:13:01PM +0900, Namhyung Kim wrote:
> > The --header-only checks file header and prints the feature data.  But
> > as pipe mode doesn't have it in the header it prints almost nothing.
> > Change it to process first few records until it founds HEADER_FEATURE.
> > 
> > Before:
> >   $ perf record -o- true | perf report -i- --header-only
> >   # ========
> >   # captured on    : Thu Dec 10 14:34:59 2020
> >   # header version : 1
> >   # data offset    : 0
> >   # data size      : 0
> >   # feat offset    : 0
> >   # ========
> >   #
> > 
> > After:
> >   $ perf record -o- true | perf report -i- --header-only
> >   # ========
> >   # captured on    : Thu Dec 10 14:49:11 2020
> >   # header version : 1
> >   # data offset    : 0
> >   # data size      : 0
> >   # feat offset    : 0
> >   # ========
> >   #
> >   # hostname : balhae
> >   # os release : 5.7.17-1xxx
> >   # perf version : 5.10.rc6.gdb0ea13cc741
> >   # arch : x86_64
> >   # nrcpus online : 8
> >   # nrcpus avail : 8
> >   # cpudesc : Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
> >   # cpuid : GenuineIntel,6,142,12
> >   # total memory : 16158916 kB
> >   # cmdline : perf record -o- true
> >   # event : name = cycles, , id = { 81, 82, 83, 84, 85, 86, 87, 88 }, size = 120, ...
> >   # CPU_TOPOLOGY info available, use -I to display
> >   # NUMA_TOPOLOGY info available, use -I to display
> >   # pmu mappings: intel_pt = 9, intel_bts = 8, software = 1, power = 20, uprobe = 7, ...
> >   # time of first sample : 0.000000
> >   # time of last sample : 0.000000
> >   # sample duration :      0.000 ms
> >   # MEM_TOPOLOGY info available, use -I to display
> >   # cpu pmu capabilities: branches=32, max_precise=3, pmu_name=skylake
> > 
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>

Thanks, applied.

- Arnaldo