linux-kernel - Re: What if a TLB flush needed to sleep?

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Message-Id: <1206624052.8514.570.camel@twins>
Date:	Thu, 27 Mar 2008 14:20:52 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"Luck, Tony" <tony.luck@...el.com>, linux-arch@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: What if a TLB flush needed to sleep?

On Wed, 2008-03-26 at 18:19 -0700, Christoph Lameter wrote:
> 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.

confusion between semaphores and rwsems



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