linux-kernel - Re: [PATCH 00/21] perf, c2c: Add new tool to analyze cacheline contention on NUMA systems

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Date:	Tue, 11 Feb 2014 12:51:35 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Don Zickus <dzickus@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, Joe Mario <jmario@...hat.com>,
	Richard Fowles <fowles@...each.com>
Subject: Re: [PATCH 00/21] perf, c2c: Add new tool to analyze cacheline
 contention on NUMA systems

On Tue, Feb 11, 2014 at 12:31:49PM +0100, Peter Zijlstra wrote:
> On Tue, Feb 11, 2014 at 12:28:47PM +0100, Stephane Eranian wrote:
> > On Tue, Feb 11, 2014 at 12:14 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> > > On Tue, Feb 11, 2014 at 12:08:56PM +0100, Stephane Eranian wrote:
> > >> Assuming you can decode and get the info about the base registers used,
> > >> you'd have to do this for each arch with load/store sampling capabilities.
> > >> this is painful compared to getting the portable info from dwarf directly.
> > >
> > > But its useful now, as compared to whenever GCC gets around to
> > > implementing more dwarves and that GCC getting used widely enough to
> > > actually rely on it.
> > >
> > > All you need for the decode is a disassembler, and every arch should
> > > already have multiple of those. Should be easy to reuse one, right?
> > 
> > I know, and you want to pull this into the perf tool?
> 
> Sure why not, its already got the world and then some :/
> 
> It would be just another dynamic lib.

The added benefit is that we could get rid of the objdump usage for
annotate if we find a usable disasm lib. At which point we can start
improving the annotations with these variable/type information as well.


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