From: Christoph Lameter <clameter@sgi.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: "Luck, Tony" <tony.luck@intel.com>,
linux-arch@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: What if a TLB flush needed to sleep?
Date: Wed, 26 Mar 2008 18:19:26 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0803261817110.1115@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <alpine.LFD.1.00.0803262121440.3781@apollo.tec.linutronix.de>
On Wed, 26 Mar 2008, Thomas Gleixner wrote:
> Please use a mutex, not a semaphore. semaphores should only be used
> when you need a counting sempahore.
Seems that mutexes are mainly useful for 2 processor systems since they
do not allow concurrent read sections. We want multiple processors able
to reclaim pages within the same vma or file concurrently. This means
processors need to be able to concurrently walk potentially long lists of
vmas.
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next prev parent reply other threads:[~2008-03-27 1:19 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-25 20:49 Luck, Tony
2008-03-25 21:47 ` Alan Cox
2008-03-26 12:32 ` Matthew Wilcox
2008-03-26 20:29 ` Luck, Tony
2008-03-27 8:09 ` Jens Axboe
2008-03-27 14:15 ` down_spin() implementation Matthew Wilcox
2008-03-28 0:01 ` Nick Piggin
2008-03-28 12:45 ` Matthew Wilcox
2008-03-28 21:16 ` Luck, Tony
2008-03-28 23:48 ` Arnd Bergmann
[not found] ` <20080328124517.GQ16721-6jwH94ZQLHl74goWV3ctuw@public.gmane.org>
2008-03-29 1:04 ` Nick Piggin
2008-03-28 4:51 ` Stephen Rothwell
2008-03-28 5:03 ` Nick Piggin
2008-03-28 12:46 ` Matthew Wilcox
2008-03-28 12:51 ` Jens Axboe
2008-03-28 13:17 ` Matthew Wilcox
2008-03-28 13:24 ` Jens Axboe
2008-03-26 19:25 ` What if a TLB flush needed to sleep? Christoph Lameter
2008-03-26 20:29 ` Thomas Gleixner
2008-03-27 1:19 ` Christoph Lameter [this message]
2008-03-27 13:20 ` Peter Zijlstra
2008-03-27 18:44 ` Christoph Lameter
2008-03-28 9:59 ` Peter Zijlstra
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