linux-kernel - Re: [PATCH v7 07/18] perf: add generic memory sampling interface

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Date:	Sat, 16 Feb 2013 09:41:28 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Stephane Eranian <eranian@...gle.com>,
	Michael Ellerman <michael@...erman.id.au>,
	Paul Mackerras <paulus@...ba.org>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Anton Blanchard <anton@...ba.org>,
	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, jolsa@...hat.com,
	namhyung.kim@....com
Subject: Re: [PATCH v7 07/18] perf: add generic memory sampling interface


* Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:

> On Fri, 2013-02-15 at 11:46 -0800, Sukadev Bhattiprolu wrote:
> > 
> > POWER could use an additional field:
> > 
> >                         mem_deratmiss:1
> 
> If you want to make that field more "generic" make it 
> "lvl1_tlb_miss", ie, a miss in the internal "level 1" TLB 
> which is the smallest/fastest TLB level in the load/store 
> unit.

I'd also suggest adding spare bits generously, if this is a 
fixed width ABI component - or a size field.

Thanks,

	Ingo
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