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

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Message-Id: <1301664130.2399.10.camel@localhost>
Date:	Fri, 01 Apr 2011 21:22:10 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 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.


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