linux-kernel - Re: [PATCH v2 0/3] perf: introduce perf based task analyzer

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Date:   Tue, 6 Dec 2022 17:21:48 -0500
From:   Petar Gligoric <petar.gligor@...il.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Petar Gligoric <petar.gligoric@...de-schwarz.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH v2 0/3] perf: introduce perf based task analyzer

On Tue, Dec 06, 2022 at 10:32:35AM -0800, Namhyung Kim wrote:
> Hello,
> 
> Have you looked at 'perf sched timehist' ?
> I think it has the common functionality and can be easily extended if there's
> missing one.
> 
> Thanks,
> Namhyung
> 

Thanks for the input! For this patchset we explicitly decided against
extending "perf sched timehist" - after some pros and cons. Mainly we
didn't want to break existing programs (which might parse the output of
perf sched) and also the goal of the task-analyzer is a bit different.
E.g what will follow as a follow-up patch, is to show IRQs visually
pleasing intermixed with tasks to show potential sources of task
latency. This will be offered as an option for the task-analyzer, but
would be too much functionality for "perf sched timehist". This was the
main reason why we decided against the extension.

Best Regards,
Petar