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

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Message-ID: <1301665752.4859.678.camel@twins>
Date:	Fri, 01 Apr 2011 15:49:12 +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 21:22 +0800, Lin Ming wrote:
> On Fri, 2011-04-01 at 19:05 +0800, Peter Zijlstra wrote:
> > On Fri, 2011-04-01 at 19:44 +0900, Masami Hiramatsu wrote:
> > > E.g. an indirect jump makes it hard to find where it jumps to.
> > 
> > Yes indirect jumps are 'interesting', is there anything in the debug
> > info that will help us out with the possible target sites?
> > 
> > Also what generates indirect jumps, switch() stmts? Indirect function
> > call that get optimized might also be, but hopefully DWARF would tell us
> > about that and allow us to know the state right after the jump.
> 
> I'm not sure.
> 
> But I'm thinking another way to trace the register assignment by LBR
> records.
> 
> LBR will introduce overhead, but it can tell us all the branches,
> including the indirect jump.


Yeah, but it would be nice to see how far we can get without using extra
information, we can always try and complement stuff later.


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