From: Andi Kleen <ak@suse.de>
To: eranian@hpl.hp.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/17] 2.6.17.1 perfmon2 patch for review: PMU context switch
Date: Mon, 3 Jul 2006 21:36:28 +0200 [thread overview]
Message-ID: <200607032136.28068.ak@suse.de> (raw)
In-Reply-To: <20060703192212.GC5471@frankl.hpl.hp.com>
On Monday 03 July 2006 21:22, Stephane Eranian wrote:
> Andi,
>
> On Mon, Jul 03, 2006 at 09:25:48PM +0200, Andi Kleen wrote:
> > On Monday 03 July 2006 11:49, Stephane Eranian wrote:
> > > Andi,
> > >
> > > Here is a first cut at the patch to simplify the context
> > > switch for the common case and also touch 2 cachelines (instead of 3).
> > > There are 2 new TIF flags. I just tried this on x86_64 but I believe
> > > we could do the same on i386.
> > >
> > > Is that what you were thinking about?
> >
> > Yes, looks good.
> >
> I have worked on this some more and I also looked at i386.
> They seem to handle the io bitmap differently there. At least
> they seem to have some lazy scheme whereby you do not reinstall
> if new task is the last owner of tss. Is there a reason for not
> having this in place for x86-64?
There was a reason but I can't remember it right now :/ Something
in the new scheme didn't fit well or it was just too complicated.
-Andi
next prev parent reply other threads:[~2006-07-03 19:36 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-23 9:13 [PATCH 10/17] 2.6.17.1 perfmon2 patch for review: PMU context switch Stephane Eranian
2006-06-30 12:27 ` Andi Kleen
2006-06-30 12:36 ` Stephane Eranian
2006-06-30 12:59 ` Andi Kleen
2006-06-30 13:29 ` Stephane Eranian
2006-06-30 13:41 ` Andi Kleen
2006-06-30 14:12 ` Stephane Eranian
2006-06-30 14:33 ` Andi Kleen
2006-06-30 16:02 ` Stephane Eranian
2006-06-30 17:08 ` Andi Kleen
2006-06-30 20:47 ` Stephane Eranian
2006-07-03 9:49 ` Stephane Eranian
2006-07-03 19:25 ` Andi Kleen
2006-07-03 19:22 ` Stephane Eranian
2006-07-03 19:36 ` Andi Kleen [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-06-30 18:33 Chuck Ebbert
2006-06-30 18:42 ` Andi Kleen
2006-06-30 18:43 ` Stephane Eranian
2006-06-30 20:40 ` Stephane Eranian
2006-06-30 19:17 Chuck Ebbert
2006-06-30 19:37 ` Andi Kleen
2006-07-01 15:21 Chuck Ebbert
2006-07-04 15:28 ` Stephane Eranian
2006-07-06 17:30 Chuck Ebbert
2006-07-06 20:16 ` Stephane Eranian
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