linux-kernel - Re: [PATCH 04/31] perf, core: Add generic intx/intx

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Message-ID: <20120928153706.GV16230@one.firstfloor.org>
Date:	Fri, 28 Sep 2012 17:37:06 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	x86@...nel.org, eranian@...gle.com, acme@...hat.com,
	Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 04/31] perf, core: Add generic intx/intx_checkpointed counter modifiers

On Fri, Sep 28, 2012 at 05:23:27PM +0200, Peter Zijlstra wrote:
> On Fri, 2012-09-28 at 16:53 +0200, Andi Kleen wrote:
> > 
> > Also as a selfish reason I would prefer something that is short 
> > to type. The qualifiers are quite common in scripts that do
> > measurements here. So I would prefer to keep :t and :c as user
> > interface.  But the internal implementation can be adjusted 
> > of course. 
> 
> But since its so very specific to HSW consuming such limited resources

We still have quite a few letters in the Latin alphabet :)

I assume any CPU with TSX will have something like that. PMU is model 
specific, but it's obviously something that is needed. So I wouldn't 
really call it HSW specific. Something like this will be likely
in many Intel CPUs going forward. 

Also I don't know for sure but it wouldn't surprise me if the other
CPUs with transactions (BG etc.) have something similar.

> 
> Maybe we can allow some configuration on the userspace side that would
> allow each individual user to be lazy and create shortcuts or aliasses
> of some sort ?

That would likely be a logistical nightmare. You could never send
a measurement script to someone else.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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