linux-kernel - Re: [PATCH 14/34] perf, x86: Avoid checkpointed counters causing excessive TSX aborts

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Message-ID: <1350997505.13456.22.camel@twins>
Date:	Tue, 23 Oct 2012 15:05:05 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, acme@...hat.com,
	eranian@...gle.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 14/34] perf, x86: Avoid checkpointed counters causing
 excessive TSX aborts

On Thu, 2012-10-18 at 16:19 -0700, Andi Kleen wrote:
> +       /* XXX move somewhere else. */
> +       if (cpuc->events[2] && (cpuc->events[2]->hw.config & HSW_INTX_CHECKPOINTED))
> +               status |= (1ULL << 2); 

A comment explaining about those 'spurious' PMIs would go along with
this nicely, no? I'm very sure I'd keep having to look up the commit
introducing this to figure out wtf its for.
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