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Date: Sat, 22 Mar 2003 20:04:55 -0800
From: Andrew Morton <akpm@digeo.com>
To: Anton Blanchard <anton@samba.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: smp overhead, and rwlocks considered harmful
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Anton Blanchard <anton@samba.org> wrote:
>
>  
> > One thing is noteworthy: ia32's read_unlock() is buslocked, whereas
> > spin_unlock() is not.  
> 
> Dont forget bitops/atomics used as spinlocks like the rmap pte chain lock.
> 

Did you end up deciding it was worthwhile putting a spinlock in the ppc64
pageframe for that?  Or hashing for it.

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