linux-kernel - Re: [PATCH v2] perf sched: fix wrong conversion of task state

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Date:	Wed, 27 Jul 2016 10:52:14 -0600
From:	David Ahern <dsahern@...il.com>
To:	Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com>,
	linux-kernel@...r.kernel.org
Cc:	ltc-kernel@...ml.intra.hitachi.co.jp,
	masumi.moritani.ju@...achi.com, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v2] perf sched: fix wrong conversion of task state

On 7/27/16 10:07 AM, Tomoki Sekiyama wrote:
> sched_out_state() converts the prev_state u64 bitmask to a char in
> a wrong way, which may cause wrong results of 'perf sched latency'.
> This patch fixes the conversion.
> Also, preempted tasks must be considered that they are in the
> THREAD_WAIT_CPU state.

you reference fixing the order of XZ as well.

>
> Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  tools/perf/builtin-sched.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> index 0dfe8df..8651c36 100644
> --- a/tools/perf/builtin-sched.c
> +++ b/tools/perf/builtin-sched.c
> @@ -70,7 +70,8 @@ struct sched_atom {
>  	struct task_desc	*wakee;
>  };
>
> -#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
> +/* TASK_STATE_MAX means the task is preempted(R+). Use '+' for it here. */
> +#define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPN+"

As I mentioned in a previous reply you can't add the '+' on the end.