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

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Date:	Wed, 26 Mar 2008 21:29:13 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Christoph Lameter <clameter@....com>
cc:	"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, 26 Mar 2008, Christoph Lameter wrote:

> On Tue, 25 Mar 2008, Luck, Tony wrote:
> 
> > 2) Is it feasible to rearrange the MM code so that we don't
> > hold any locks while doing a TLB flush?  Or should I implement
> > some sort of spin_only_semaphore?
> 
> The EMM notifier V2 patchset contains two patches that 
> convert the immap_lock and the anon_vma lock to semaphores.

Please use a mutex, not a semaphore. semaphores should only be used
when you need a counting sempahore.

Thanks,

	tglx
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