linux-kernel - Re: [PATCH 3/3] perf timechart: add more options to IO mode

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Message-ID: <87lht39bx0.fsf@sejong.aot.lge.com>
Date:	Thu, 12 Jun 2014 10:03:39 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Stanislav Fomichev <stfomichev@...dex-team.ru>
Cc:	acme@...nel.org, artagnon@...il.com, jolsa@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] perf timechart: add more options to IO mode

On Tue, 10 Jun 2014 19:04:54 +0400, Stanislav Fomichev wrote:
> --io-skip-eagain - don't show EAGAIN errors
> --io-min-time    - make small io bursts visible
> --io-merge-dist  - merge adjacent events
>
> Signed-off-by: Stanislav Fomichev <stfomichev@...dex-team.ru>
> ---
>  tools/perf/Documentation/perf-timechart.txt |  9 ++++++
>  tools/perf/builtin-timechart.c              | 49 +++++++++++++++++++++++++++--
>  2 files changed, 56 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-timechart.txt b/tools/perf/Documentation/perf-timechart.txt
> index ec6b46c7bca0..62c29656ad95 100644
> --- a/tools/perf/Documentation/perf-timechart.txt
> +++ b/tools/perf/Documentation/perf-timechart.txt
> @@ -64,6 +64,15 @@ TIMECHART OPTIONS
>  	duration or tasks with given name. If number is given it's interpreted
>  	as number of nanoseconds. If non-numeric string is given it's
>  	interpreted as task name.
> +--io-skip-eagain::
> +	Don't draw EAGAIN IO events.
> +--io-min-time::
> +	Draw small events as if they lasted min-time. Useful when you need
> +	to see very small and fast IO. Default value is 1ms.

It's in nano-second unit, right?  If so, it's very unconvenient for user
to specify.  Maybe we could support to parse unit (s, ms, us, ...) also.


> +--io-merge-dist::
> +	Merge events that are merge-dist nanoseconds apart.
> +	Reduces number of figures on the SVG and makes it more render-friendly.
> +	Default value is 1us.

Ditto.

Thanks,
Namhyung
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