linux-kernel - Re: [PATCHSET 0/5] perf report: Make --stat output more compact

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Date:   Mon, 26 Apr 2021 09:53:17 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
        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>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCHSET 0/5] perf report: Make --stat output more compact

Em Sun, Apr 25, 2021 at 09:31:47PM -0700, Andi Kleen escreveu:
> > Hmm.. do you want something like this?

> >              TOTAL events:      20064
> >               MMAP events:        239   ( 1.2%)
> >               COMM events:       1518   ( 7.6%)
> >               EXIT events:          1   (0.0%)
> >               FORK events:       1517   (7.6%)
> >             SAMPLE events:       4015   (20.0%)
> >              MMAP2 events:      12769   (63.6%)

> Yes that's it.

> Really shows how inefficient perf is for short measurement
> periods.

Brainstorming a bit:

Yeah, I wonder if we could have a new mode where 'perf daemon' collects
the !SAMPLE records and then a 'perf record' would collect just
PERF_RECORD_SAMPLEs, and then 'perf report' would merge things up.

A perf.data file cap for the 'perf daemon' would mean that when a 'perf
report' result looks interesting, one could press a hotkey and generate
a complete perf.data file with the !SAMPLE records needed to have it
self sufficient.

Additionally maybe we could have 'perf daemon' providing a interface to
resolve samples, returning unresolved ones for older stuff.

wdyt?

- Arnaldo