linux-kernel - Re: [patch 2/2] x86,pat Convert memtype_lock into an rw

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Date:	Wed, 17 Mar 2010 16:19:18 -0800
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"holt@....com" <holt@....com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [patch 2/2] x86,pat Convert memtype_lock into an rw_lock.

On Wed, 2010-03-17 at 12:51 -0700, H. Peter Anvin wrote:
> Well, as you know :) tglx and I are on the road ... I'll try to get to it on Friday before I take off again.

Also I talked to Thomas about this rwlock conversion and he referred to
RT issues with rwlock. And the best is to avoid this using RCU.

For now, the second patch can be perhaps dropped, as we are being
proactive anyways. We can revisit this in the future.

First patch "[patch 1/2] x86,pat Update the page flags for memtype
atomically instead of using memtype_lock. -V3" is good to go.

thanks,
suresh

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