linux-kernel - Re: [PATCH -tip v3 3/6] perf branch trace: print pid and command

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Date:	Wed, 6 Apr 2011 14:18:21 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	David Ahern <dsahern@...il.com>,
	Akihiro Nagai <akihiro.nagai.hw@...achi.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	2nddept-manager@....hitachi.co.jp,
	Paul Mackerras <paulus@...ba.org>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH -tip v3 3/6] perf branch trace: print pid and command

Em Wed, Apr 06, 2011 at 04:55:23PM +0200, Frederic Weisbecker escreveu:
> On Wed, Apr 06, 2011 at 11:09:58AM -0300, Arnaldo Carvalho de Melo wrote:
> > Isn't there one in the 'tip/tmp.perf/trace' tmp branch? Lemme see...
> > 
> > Yeah, and it is even yours ;-)
> > 
> > commit 6a824e89c0dfe6bce3d7e85f987ec9c8e7304b34
> > Author: Frederic Weisbecker <fweisbec@...il.com>
> > Date:   Fri Nov 12 05:35:06 2010 +0100
> > 
> >     perf, mm: Add fault tracing
> >     
> >     Part of that are two modified patches from Jiri Olsa who added the
> >     fault tracepoints. I had to split them in two tracepoints so that we get
> >     the faults handling duration.
> >     
> >     Originally-from: Frederic Weisbecker <fweisbec@...il.com>
> >     Signed-off-by: Ingo Molnar <mingo@...e.hu>
> >     Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> 
> That forgets to mention it's based on Jiri Olsa's patch :)
> 
> "tracing,mm - add kernel pagefault tracepoint for x86 & x86_64"
> 
> (Message id <1289466549-7602-3-git-send-email-jolsa@...hat.com>).
> 
> > 
> > Can we dust this one off and get the ball rolling again? 
> 
> I prefer someone comes with a real need before me or Jiri respin
> that. There was perf trace but its development seems to be stale
> now.

Yeah, I need to resume work on it, sidetracked now tho.
 
> The page fault software event seem to be enough for basic
> dump requests. I don't like software events and prefer tracepoints
> in general but as long as the current implementation is enough
> and people don't need to measure page fault servicing time,
> write scripts or so, we are probably fine.

- ARnaldo
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