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

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Date:	Thu, 31 Jul 2014 15:31:35 +0800
From:	"Yan, Zheng" <zheng.z.yan@...el.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	"Kleen, Andi" <andi.kleen@...el.com>, 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 07/28/2014 02:52 PM, Peter Zijlstra wrote:
> 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.
> 

Andi,

please confirm this

Regards
Yan, Zheng

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