linux-kernel - Re: [PATCH 0/4] perf events: Add realtime clock event and timehist option -v2

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Message-ID: <4D62DC21.4070407@cisco.com>
Date:	Mon, 21 Feb 2011 14:41:53 -0700
From:	David Ahern <daahern@...co.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	acme@...stprotocols.net, mingo@...e.hu, peterz@...radead.org,
	paulus@...ba.org, tglx@...utronix.de
Subject: Re: [PATCH 0/4] perf events: Add realtime clock event and timehist
 option -v2



On 02/21/11 14:37, Frederic Weisbecker wrote:

> The goal is actually to extend perf script to handle more than just raw data.
> So that it can handle the rest of what we can find in an event: time, ip, stacktraces...
> 
> You've added 200 lines in perf report to add the dump support. It wouldn't
> require more to extend perf script to do that. And the result is going to be
> much more powerful.
> 
> Look at struct scripting_ops::process_event().

I actually have a draft of perf-script - essentially duplicating sample
processing done in perf-report. When it got to the point of having to
add a lot of code -- other features essentially -- just to get it to the
point of being ready for this feature I stopped.

David


> 
> What you need is too pass in the whole event instead of only the raw data,
> cpu and so on...
> 
> You don't even need to add the support in the scripts themselves, they can
> just cope with the new parameter layout. You only need to handle the rest of
> the event in the print_event() function (the default scripting_ops::process_event())
> to print ip, time and stacktraces.
> 
> This probably needs some option in perf script to avoid showing ip and other
> new things. Although we probably want to print stacktraces by default
> if there are present.
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