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From: rainkin <rainkin1993@gmail.com>
To: linux-perf-users@vger.kernel.org
Subject: [Question] How to sample PERF_TYPE_HARDWARE
Date: Mon, 8 Feb 2021 11:47:51 +0800	[thread overview]
Message-ID: <CAHb-xavRszhCbGcs0DgrdoJCHmOznHC4UzhLXxtXz=gXXk+wMQ@mail.gmail.com> (raw)

Hello~

My goal is to record the number of occurring PERF_TYPE_HARDWARE events
(e.g., branches) every N events.

In my understanding, the "perf stat -e branches -I N " command is not
sampling, it is actually count model which records branches every N
millisecond. Thus perf stat does not meet my goal.

For the "perf record -e cycles -b" command, it does sampling, which
records a LBR sample every N cycles events. However, it seems that
"perf record" does not support sampling PERF_TYPE_HARDWARE.

I also look at the syscall perf_event_open, but still cannot find any
documentation about how to sample PERF_TYPE_HARDWARE.

Does anyone know how to do that？Any suggestions is helpful for me :)

Rainkin

             reply	other threads:[~2021-02-08  3:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-08  3:47 rainkin [this message]
2021-02-16  7:50 ` [Question] How to sample PERF_TYPE_HARDWARE Namhyung Kim
2021-02-18  1:22   ` rainkin
2021-02-18  2:04   ` rainkin
2021-02-19  7:09     ` Namhyung Kim

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