linux-kernel - Re: [patch]x86: avoid unnecessary tlb flush

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Message-ID: <4C65B449.4010905@zytor.com>
Date:	Fri, 13 Aug 2010 14:08:25 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Shaohua Li <shaohua.li@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [patch]x86: avoid unnecessary tlb flush

On 08/13/2010 12:29 PM, Hugh Dickins wrote:
> 
> Just added Andrea to the Cc list: he did that TLB flush in 1a44e149,
> I'd feel more comfortable noop-ing it on x86 if you've convinced him.
> 
> Hugh

Andrea is probably on his way back from LinuxCon, but looking at the
original patch it might be something that non-x86 architectures need,
but which can be optimized specifically on x86, since x86 has explicit
"no flush needed when going to more permissive" semantics.

	-hpa
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