linux-kernel - Re: [PATCH] mm/x86: Patch out arch_flush_lazy_mmu

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Message-ID: <20130228233720.GB17468@pd.tnic>
Date:	Fri, 1 Mar 2013 00:37:20 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de,
	konrad.wilk@...cle.com, rostedt@...dmis.org,
	gregkh@...uxfoundation.org, samu.kallio@...rdeencloud.com,
	kraman@...hat.com, jwboyer@...hat.com, xen-devel@...ts.xen.org,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH] mm/x86: Patch out arch_flush_lazy_mmu_mode() when
 running on bare metal

On Thu, Feb 28, 2013 at 05:55:49PM -0500, Boris Ostrovsky wrote:
> Invoking arch_flush_lazy_mmu_mode() results in calls to
> preempt_enable()/disable() which may have performance impact.
> 
> Since lazy MMU is not used on bare metal we can patch away
> arch_flush_lazy_mmu_mode() so that it is never called in such
> environment.
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

Looks straight-forward enough to me.

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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