linux-kernel - Re: [GIT PULL 0/4] perf/annotate loop detection V2, fixes

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Message-ID: <20120428133826.GL27997@infradead.org>
Date:	Sat, 28 Apr 2012 10:38:26 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Hagen Paul Pfeifer <hagen@...u.net>,
	Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [GIT PULL 0/4] perf/annotate loop detection V2, fixes

Em Fri, Apr 27, 2012 at 04:17:09PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Apr 27, 2012 at 11:23:24AM -0700, Linus Torvalds escreveu:
> > On Fri, Apr 27, 2012 at 11:03 AM, Arnaldo Carvalho de Melo
> > > I should have reworded the "loop detection" with "basic jump arrows" in
> > > the first place.
> > 
> > .. and that is fine. But then you need to do it for *forwards* jumps
> > too. There is no difference between backwards and forwards jumps
> > *unless* you are looking for loops, and if you are looking for loops
> > you need to actually find the cycle.
> 
> Ok, so I changed things to not try to detect loops at all, for now, and
> instead just start with 'show jumps' on, hotkey 'j', that will draw
> arrows from jumps to its targets, backwards or forwards, when the cursor
> is on a jump instruction, take a look:

I pushed this one plus some more changes to my perf/annotate branch.

- Arnaldo
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