From: Matt Mackall <mpm@selenic.com>
To: Andi Kleen <ak@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Marin Mitov <mitov@issp.bas.bg>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>
Subject: Re: is minimum udelay() not respected in preemptible SMP kernel-2.6.23?
Date: Wed, 7 Nov 2007 20:44:26 -0600 [thread overview]
Message-ID: <20071108024425.GR19691@waste.org> (raw)
In-Reply-To: <200711080220.59086.ak@suse.de>
On Thu, Nov 08, 2007 at 02:20:58AM +0100, Andi Kleen wrote:
>
> > But I think we'd be best off stashing a single bit somewhere and
> > checking it at migrate time (relatively infrequent) rather than
> > copying and zeroing out a potentially enormous affinity mask every
> > time we disable migration (often, and in fast paths). Perhaps adding
> > TASK_PINNED to the task state flags would do it?
>
> It would need to be a count to be able to nest it.
Ahh, right. Suppose that means fattening the task struct until someone
comes up with something more clever.
--
Mathematics is the supreme nostalgia of our time.
next prev parent reply other threads:[~2007-11-08 2:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-07 17:21 is minimum udelay() not respected in preemptible SMP kernel-2.6.23? Marin Mitov
2007-11-07 20:30 ` Andrew Morton
2007-11-07 23:10 ` Andi Kleen
2007-11-08 0:20 ` Matt Mackall
2007-11-08 0:31 ` Andi Kleen
2007-11-08 1:03 ` Matt Mackall
2007-11-08 1:20 ` Andi Kleen
2007-11-08 2:44 ` Matt Mackall [this message]
2007-11-08 11:46 ` Avi Kivity
2007-11-08 15:10 ` Matt Mackall
2007-11-08 9:11 ` Peter Zijlstra
2007-11-08 15:43 ` Matt Mackall
2007-11-08 11:24 ` Marin Mitov
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