linux-kernel - Re: [RFC PATCH 1/3] sched, tracing: report task state in symbolic chars instead

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Message-ID: <CAD8CoPDmHFLMixss1oEk0e-mVYKgwKxt1tXGtFpnwS+Rg-VwBA@mail.gmail.com>
Date:   Wed, 26 Jul 2023 10:48:18 +0800
From:   Ze Gao <zegao2021@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, Ze Gao <zegao@...cent.com>
Subject: Re: [RFC PATCH 1/3] sched, tracing: report task state in symbolic
 chars instead

I'd like to try this one, and request for another RFC.

Regards,
Ze

On Wed, Jul 26, 2023 at 5:55 AM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Tue, 25 Jul 2023 22:16:03 +0200
> Peter Zijlstra <peterz@...radead.org> wrote:
>
> > > Now, because the old tools still do the parsing of this format, we can
> > > add a new field called prev_state_char that will give you this. Now to
> > > save space, we should change prev_state to int (can't make it short as
> > > there's that test for "+" which does sometimes happen). I believe we
> > > can make prev_prio and next prio into shorts (and possibly chars!).
> >
> > Or just leave the thing alone?
>
> Sure, but I would like to change the fields to smaller ones just so
> that the event wastes less space on the buffer.
>
> -- Steve