linux-kernel - Re: [RFC/PATCH] perf sched: Implement 'perf sched runtime' command

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Message-ID: <55DC0900.3010500@gmail.com>
Date:	Mon, 24 Aug 2015 23:19:44 -0700
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC/PATCH] perf sched: Implement 'perf sched runtime' command

On 8/24/15 11:11 PM, Namhyung Kim wrote:
>
> +static int perf_sched__read_runtime_events(struct perf_sched *sched)
> +{
> +	const struct perf_evsel_str_handler handlers[] = {
> +		{ "sched:sched_switch",	      process_sched_switch_event, },
> +		{ "sched:sched_stat_runtime", process_sched_runtime_event, },
> +		{ "sched:sched_stat_sleep",   process_sched_sleep_event, },
> +		{ "sched:sched_stat_wait",    process_sched_wait_event, },
> +		{ "sched:sched_stat_iowait",  process_sched_iowait_event, },
> +		{ "sched:sched_migrate_task", process_sched_migrate_task_event, },
> +	};

I like the concept (obviously since I have invested so much time in 
other solutions). But... you cannot rely on the sched_stat tracepoints 
being enabled. I believe it is a performance hit to have 
CONFIG_SCHEDSTATS enabled and distributions (e.g., Fedora) do not have 
it enabled.
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