linux-kernel - Re: [PATCH v3 6/9] perf, x86: handle multiple records in PEBS buffer

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Message-ID: <20140728065255.GI6758@twins.programming.kicks-ass.net>
Date:	Mon, 28 Jul 2014 08:52:55 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, acme@...radead.org,
	eranian@...gle.com, andi@...stfloor.org
Subject: Re: [PATCH v3 6/9] perf, x86: handle multiple records in PEBS buffer

On Mon, Jul 28, 2014 at 10:24:30AM +0800, Yan, Zheng wrote:

> I don't think this method works for interrupt threshold > 1 case. When collision
> happens, the hardware only create one PEBS record. The status in next record has
> nothing to do with the collision record.

Andi previously stated that the hardware will always generate a record
for each event:

  http://marc.info/?l=linux-kernel&m=140129731708247

Please lock yourselves in room and do not come out until you can give a
straight and coherent answer.

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