linux-kernel - Re: [PATCH 11/11] perf/x86/intel: Perform rotation on Intel CQM RMIDs

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Message-ID: <alpine.DEB.2.11.1410082029020.4292@nanos>
Date:	Wed, 8 Oct 2014 21:02:16 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Matt Fleming <matt@...sole-pimps.org>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH 11/11] perf/x86/intel: Perform rotation on Intel CQM
 RMIDs

On Wed, 8 Oct 2014, Peter Zijlstra wrote:
> On Wed, Sep 24, 2014 at 03:04:15PM +0100, Matt Fleming wrote:
> > +	preempt_disable();

< SNIP loooong code >

> > +	preempt_enable();
> 
> Why is all that under preempt_disable()?

To make life harder for people who care about latencies and
deterministic behaviour perhaps?

Thanks,

	tglx


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