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From: David Ahern <dsahern@gmail.com>
To: Namhyung Kim <namhyung@kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Jiri Olsa <jolsa@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
	Andi Kleen <andi@firstfloor.org>,
	Minchan Kim <minchan@kernel.org>
Subject: Re: [PATCHSET 0/6] perf sched timehist: Introduce --idle-hist option (v2)
Date: Sat, 10 Dec 2016 09:32:54 -0700	[thread overview]
Message-ID: <00499939-48a7-217d-8127-47763abf5fbd@gmail.com> (raw)
In-Reply-To: <20161208144755.16673-1-namhyung@kernel.org>

On 12/8/16 7:47 AM, Namhyung Kim wrote:
> Hi,
> 
> This patchset implements the idle hist feature which analyze reason of system
> idle.  Sometimes I need to investigate what makes CPUs to go idle even though
> I have jobs to do.  It may be due to I/O, waiting on lock or whatever.
> 

...

> Namhyung Kim (6):
>   perf sched timehist: Split is_idle_sample()
>   perf sched timehist: Introduce struct idle_time_data
>   perf sched timehist: Save callchain when entering idle
>   perf sched timehist: Skip non-idle events when necessary
>   perf sched timehist: Add -I/--idle-hist option
>   perf sched timehist: Show callchains for idle stat
> 
>  tools/perf/Documentation/perf-sched.txt |   4 +
>  tools/perf/builtin-sched.c              | 252 +++++++++++++++++++++++++++-----
>  2 files changed, 222 insertions(+), 34 deletions(-)
> 

LGTM

Acked-by: David Ahern <dsahern@gmail.com>

Suggested improvement: Add the length of the time window. ie., data collected (or analyzed over if --time is used) for N.M seconds. Puts the amount of idle time into perspective.

  parent reply	other threads:[~2016-12-10 16:33 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-08 14:47 [PATCHSET 0/6] perf sched timehist: Introduce --idle-hist option (v2) Namhyung Kim
2016-12-08 14:47 ` [PATCH v2 1/6] perf sched timehist: Split is_idle_sample() Namhyung Kim
2016-12-20 19:19   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2016-12-08 14:47 ` [PATCH v2 2/6] perf sched timehist: Introduce struct idle_time_data Namhyung Kim
2016-12-20 19:20   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2016-12-08 14:47 ` [PATCH v2 3/6] perf sched timehist: Save callchain when entering idle Namhyung Kim
2016-12-13  8:06   ` [PATCH 1/2] perf sched timehist: Fix --idle-hist when no callchains Namhyung Kim
2016-12-13  8:06     ` [PATCH 2/2] perf sched timehist: Fix invalid runtime in the idle hist Namhyung Kim
2016-12-13 10:32       ` Arnaldo Carvalho de Melo
2016-12-13 10:54         ` Namhyung Kim
2016-12-13 13:12           ` Arnaldo Carvalho de Melo
2016-12-20 19:21       ` [tip:perf/urgent] perf sched timehist: Add -I/--idle-hist option tip-bot for Namhyung Kim
2016-12-13 10:32     ` [PATCH 1/2] perf sched timehist: Fix --idle-hist when no callchains Arnaldo Carvalho de Melo
2016-12-13 10:49       ` Namhyung Kim
2016-12-13 12:03         ` Arnaldo Carvalho de Melo
2016-12-13 13:04         ` Arnaldo Carvalho de Melo
2016-12-20 19:20     ` [tip:perf/urgent] perf sched timehist: Save callchain when entering idle tip-bot for Namhyung Kim
2016-12-08 14:47 ` [PATCH v2 4/6] perf sched timehist: Skip non-idle events when necessary Namhyung Kim
2016-12-20 19:21   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2016-12-08 14:47 ` [PATCH v2 5/6] perf sched timehist: Add -I/--idle-hist option Namhyung Kim
2016-12-08 14:47 ` [PATCH v2 6/6] perf sched timehist: Show callchains for idle stat Namhyung Kim
2016-12-20 19:22   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2016-12-10 16:32 ` David Ahern [this message]
2016-12-12 17:26   ` [PATCHSET 0/6] perf sched timehist: Introduce --idle-hist option (v2) Namhyung Kim
2016-12-12 17:37     ` David Ahern
2016-12-13  8:05       ` Namhyung Kim
2016-12-14 21:33         ` David Ahern
2016-12-15 15:17           ` Namhyung Kim

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