From: Andi Kleen <ak@suse.de>
To: Arjan van de Ven <arjan@linux.intel.com>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [Patch 2/3] fast VMA recycling
Date: Thu, 23 Feb 2006 12:57:46 +0100 [thread overview]
Message-ID: <200602231257.47194.ak@suse.de> (raw)
In-Reply-To: <43FD9AEF.1040204@linux.intel.com>
On Thursday 23 February 2006 12:22, Arjan van de Ven wrote:
> Andi Kleen wrote:
> >> see voluntary preempt.
> >
> > Only when its time slice is used up
>
> or if some other thread gets a higher dynamic prio
> > but then it would sleep a bit later
> > in user space.
>
> ... but that is without the semaphore held! (and that is the entire
> point of this patch, move the sleep moments to outside the lock holding
> area as much as possible, to reduce lock hold times)
And you verified this happens often in your workload?
Anyways, how about adding a down_no_preempt() or similar instead
that won't voluntarily preempt?
-Andi
next prev parent reply other threads:[~2006-02-23 11:57 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-23 9:17 [Patch 0/3] threaded mmap tweaks Arjan van de Ven
2006-02-23 9:29 ` [Patch 3/3] prepopulate/cache cleared pages Arjan van de Ven
2006-02-23 9:41 ` Andi Kleen
2006-02-23 12:41 ` Ingo Molnar
2006-02-23 13:06 ` Andi Kleen
2006-02-23 13:15 ` Nick Piggin
2006-02-23 13:29 ` Ingo Molnar
2006-02-24 6:36 ` Nick Piggin
2006-02-24 6:49 ` Ingo Molnar
2006-02-24 7:01 ` Nick Piggin
2006-02-24 12:33 ` Andi Kleen
2006-02-24 12:55 ` Hugh Dickins
2006-02-24 9:15 ` Arjan van de Ven
2006-02-24 9:26 ` Nick Piggin
2006-02-24 12:27 ` Andi Kleen
2006-02-24 15:31 ` Andrea Arcangeli
2006-02-25 16:48 ` Nick Piggin
2006-02-25 17:22 ` Nick Piggin
2006-02-28 22:30 ` Pavel Machek
2006-02-23 18:25 ` Paul Jackson
2006-02-23 9:30 ` [Patch 2/3] fast VMA recycling Arjan van de Ven
2006-02-23 9:42 ` Andi Kleen
2006-02-23 9:48 ` Arjan van de Ven
2006-02-23 10:05 ` Andi Kleen
2006-02-23 10:15 ` Arjan van de Ven
2006-02-23 11:00 ` Andi Kleen
2006-02-23 11:22 ` Arjan van de Ven
2006-02-23 11:57 ` Andi Kleen [this message]
2006-02-24 18:52 ` Christoph Hellwig
2006-02-24 19:05 ` Andi Kleen
2006-02-24 19:09 ` Christoph Hellwig
2006-02-23 16:37 ` Benjamin LaHaise
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