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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

  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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