linux-kernel - Re: [RFC PATCH 7/7] perf, x86: drain PEBS buffer during context switch

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Message-ID: <20140528081204.GQ11096@twins.programming.kicks-ass.net>
Date:	Wed, 28 May 2014 10:12:04 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, eranian@...gle.com,
	ak@...ux.intel.com
Subject: Re: [RFC PATCH 7/7] perf, x86: drain PEBS buffer during context
 switch

On Wed, May 28, 2014 at 02:18:10PM +0800, Yan, Zheng wrote:
> Flush the PEBS buffer during context switch if PEBS interrupt threshold
> is larger than one. This allows perf to supply TID for events.

I have the distinct feeling you're doing this patch series the wrong way
around. It seems to me patch 5 completely breaks PEBS, patch 6 maybe
patches it up a bit, but only after this patch things work again
(maybe).

That's wrong.

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