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

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Date:	Thu, 20 Jun 2013 17:26:40 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	David Ahern <dsahern@...il.com>
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


* David Ahern <dsahern@...il.com> wrote:

> 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.

If it's easier you could start by using your code as the starting point 
and add back perf sched features after that. I find your tool 
fundamentally more valuable because it's in active use.

> 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. ;-)

:-)

Thanks,

	Ingo
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