linux-kernel - Re: [PATCH] perf_events: fix broken intr throttling (v3)

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Date:	Fri, 10 Feb 2012 17:15:19 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Anton Blanchard <anton@...ba.org>,
	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	gleb@...hat.com, wcohen@...hat.com, vince@...ter.net,
	asharma@...com, andi@...stfloor.org, paulus@...ba.org,
	emunson@...bm.net, imunsie@....ibm.com
Subject: Re: [PATCH] perf_events: fix broken intr throttling (v3)

On Thu, 2012-02-09 at 19:19 -0800, Sukadev Bhattiprolu wrote:
> Stephane Eranian [eranian@...gle.com] wrote:
> | On Wed, Feb 8, 2012 at 12:32 PM, Anton Blanchard <anton@...ba.org> wrote:
> | >
> | > Hi,
> | >
> | > On Thu, 26 Jan 2012 17:03:19 +0100
> | > Stephane Eranian <eranian@...gle.com> wrote:
> | >
> | >> This patch fixes the throttling mechanism. It was broken
> | >> in 3.2.0. Events were not being unthrottled. The unthrottling
> | >> mechanism required that events be checked at each timer tick.
> | >
> | > This patch breaks perf on POWER. I haven't had a chance to work out why
> | > yet, but will investigate tomorrow.
> | >
> | Did you apply the subsequent patch I posted yesterday:
> | 
> | https://lkml.org/lkml/2012/2/7/185
> 
> I applied both patches to the powerpc.git tree - following hunk already
> exists in the powerpc tree (and even Jan 27 mainline) so I skipped this
> hunk.

The powerpc .git tree is not useful at this point, I haven't opened
powerpc -next yet so it's just all old stale stuff. Please work with
upstream always unless you have a very good reason to use my tree. It's
really only meant as a conduit between me and Linus or for -next.

Cheers,
Ben.


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