linux-kernel - Re: [RFC PATCH 4/4] perf: add timehist command

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Date:	Thu, 20 Jun 2013 09:00:06 -0600
From:	David Ahern <dsahern@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	acme@...stprotocols.net, linux-kernel@...r.kernel.org,
	peterz@...radead.org, fweisbec@...il.com, jolsa@...hat.com,
	namhyung@...nel.org, eranian@...gle.com
Subject: Re: [RFC PATCH 4/4] perf: add timehist command

On 6/20/13 4:46 AM, Ingo Molnar wrote:
> Looks very useful!
>
> This is the kind of analysis I thought 'perf sched' might one day end up
> doing.
>
> Do you plan to submit it non-RFC, to be merged?

Yes. Hopefully I can find time to work on it over the next 2 months for 
3.12, 3.13 at the latest.

>
> Your tool could take over the somewhat stale 'perf sched' command as well
> btw., while possibly carrying over some of the perf sched features like
> 'replay'.
>
> 'perf sched record' enough events to support the ones you need:
>
>> >        perf record -e cs -c 1 -ag -- <workload>
> plus:
>
>   'perf sched sum[mary]'       # show the summary
>   'perf sched tree'            # could show the tree.
>   'perf sched hist[ogram]'     # would show the histogram
>
> i.e. feel free to take over 'perf sched' to suit your 'timehist' workflow
> and logic. As the main (and somewhat overworked) author of 'perf sched' I
> have no problem with you taking it over, at all.

It should be part of perf-sched. It is not at the moment for a number of 
(mostly shortcut) reasons. For the next iteration I will look at 
combining it with perf-sched and in the process I will go through the 
existing code for perf-sched.

As an FYI I also have a daemon that provides the functionality in a 
flight recorder mode but with data dumped only when requested. Future 
project to integrate that with perf. ;-)

>
> You could also add a 'perf timehist' alias to the new 'perf sched'
> command, to keep your original (and well established?) naming.

It is well established internally, so a convenience shortcut would 
lessen the pain of moving to newer perf versions when the time comes.

David
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