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

[Peter Zijlstra]

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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