linux-kernel - Re: [RFC PATCH] perf report: add sort by file lines

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Date:	Fri, 01 Apr 2011 15:48:14 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"2nddept-manager@....hitachi.co.jp" 
	<2nddept-manager@....hitachi.co.jp>
Subject: Re: [RFC PATCH] perf report: add sort by file lines

On Fri, 2011-04-01 at 21:02 +0800, Lin Ming wrote:
> On Fri, 2011-04-01 at 00:32 +0800, Peter Zijlstra wrote:
> > On Thu, 2011-03-31 at 18:28 +0200, Peter Zijlstra wrote:
> > > 
> > > You could even first build the basic block tree and only follow those
> > > branches that end up covering the region IP is in.
> > 
> > s/tree/directed-graph/ clearly the basic blocks don't form a tree and
> > can contain cycles.
> 
> There may be multiple different paths from the beginning of the function
> to the point we are interested in.
> 
> Any idea how to handle this case?

Any one path should be sufficient I think, C doesn't really have dynamic
typing so whatever path leads you to where you need to be ought to be
type invariant.


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