linux-kernel - Re: [PATCH 1/1] Perf: fix overwritten of free running PEBSv3 timestamp

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Message-ID: <20160211172631.GO6357@twins.programming.kicks-ass.net>
Date:	Thu, 11 Feb 2016 18:26:31 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tong Zhang <ztong@...edu>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] Perf: fix overwritten of free running PEBSv3
 timestamp

On Thu, Feb 11, 2016 at 11:39:18AM -0500, Tong Zhang wrote:
> How about moving `time' to the `group', Will this help?

Somewhat, but the patch is still really horrid. It makes t==0 a special
case and seems to scatter this all over the place.

It also consumes the last word in that cacheline :/

There's a few other options, but so far I'm not really liking any of
them very much either :/