linux-kernel - Re: [RFC PATCH v3 3/6] sched, tracing: add to report task state in symbolic chars

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Message-ID: <20230801114545.GD79828@hirez.programming.kicks-ass.net>
Date:   Tue, 1 Aug 2023 13:45:45 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ze Gao <zegao2021@...il.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org,
        linux-trace-devel@...r.kernel.org, Ze Gao <zegao@...cent.com>
Subject: Re: [RFC PATCH v3 3/6] sched, tracing: add to report task state in
 symbolic chars

On Tue, Aug 01, 2023 at 05:01:21PM +0800, Ze Gao wrote:
> @@ -233,6 +255,7 @@ TRACE_EVENT(sched_switch,
>  		__field(	pid_t,	prev_pid			)
>  		__field(	int,	prev_prio			)
>  		__field(	long,	prev_state			)
> +		__field(	char,	prev_state_char			)
>  		__array(	char,	next_comm,	TASK_COMM_LEN	)
>  		__field(	pid_t,	next_pid			)
>  		__field(	int,	next_prio			)

And this again will wreck everybody that consumes the raw tracepoint
without looking at tracefs.