Re: [PATCH 08/19] perf c2c: Shared data analyser

[Don Zickus]

On Mon, Mar 03, 2014 at 06:23:16PM +0100, Andi Kleen wrote:
> > Hmm, so based on Andi's reply, I am assuming you are running on a Westmere
> > (or Nehalem) due to the lack of mem-stores.
> > 
> > If you don't have mem-stores, this tool isn't going to work.  The tool can
> > only detect contention when sampling reads _and_ writes to the same
> > addresses.
> 
> On these CPUs you could simply sample on HITM. You won't get addresses,
> but at least IPs and call stacks.

Heh.  I never thought about that.  And sure enough a quick test with
mem-stores commented out produced the same results (minus the stores).

One would just have to 'figure' out what cacheline offsets are causing the
HITMs.

Cheers,
Don
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