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

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Message-ID: <20140211110820.GV9987@twins.programming.kicks-ass.net>
Date:	Tue, 11 Feb 2014 12:08:20 +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 12:04:23PM +0100, Stephane Eranian wrote:
> >> How do you know that load at addr 0x1000 is accessing variable bar?
> >> The IP gives you line number, and then what?
> >> I think dwarf has the mapping regs -> variable and yes, the type info.
> >> But I am not sure that's enough.
> >
> > Ah, but if you have the instruction, you can decode it and obtain the
> > reg and thus type-info, no?
> >
> But on x86, you can load directly from memory, you'd only have the
> target reg for the load. Not enough.

But if you load an immediate, you should be able to find it in the
symbol table.

Any other load will have a register base and will thus have type-info
therefrom.
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