linux-kernel - Re: [PATCH v5 0/3] perf synthetic events

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Message-ID: <CAM9d7cj4fMsnDLgq0rHwqb6_ZLKP-AOzyyAP4kd=b=P5-t5NGQ@mail.gmail.com>
Date:   Thu, 16 Apr 2020 23:19:19 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, Petr Mladek <pmladek@...e.com>,
        Andrey Zhizhikin <andrey.z@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v5 0/3] perf synthetic events

Hi Ian,

On Wed, Apr 15, 2020 at 2:40 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Add a multi-threaded version of the internals synthesize benchmark. It
> attempts to compute a time per event synthesized, but as it is reading
> /proc there are issues:
>  - permissions if not run as root
>  - "random" nature of /proc
>
> By default the benchmark is disabled but can be enabled with a
> flag. It has been useful in gauging the value of multi-threaded
> improvements not included here as their value appears minimal.
>
> The patch set includes 2 patches that improve synthesis performance
> and updates the benchmark numbers:
> https://lore.kernel.org/lkml/20200411064248.247530-1-irogers@google.com/
>
> v4 added a missing test file
> v3 improved documenation, return values and added testing to the io framework
>    following feedback from namhyung@...nel.org.
> v2 addressed single threaded synthesize benchmark issues from jolsa@...hat.com
> https://lore.kernel.org/lkml/20200402154357.107873-1-irogers@google.com/
>
> Ian Rogers (3):
>   perf bench: add a multi-threaded synthesize benchmark
>   tools api: add a lightweight buffered reading api
>   perf synthetic events: Remove use of sscanf from /proc reading

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks
Namhyung