linux-kernel - Re: [PATCH 3/4] mm: Defer flush of writable TLB entries

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Message-ID: <55774664.6060402@redhat.com>
Date:	Tue, 09 Jun 2015 16:02:44 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Hugh Dickins <hughd@...gle.com>, Minchan Kim <minchan@...nel.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	H Peter Anvin <hpa@...or.com>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] mm: Defer flush of writable TLB entries

On 06/09/2015 01:31 PM, Mel Gorman wrote:
> If a PTE is unmapped and it's dirty then it was writable recently. Due
> to deferred TLB flushing, it's best to assume a writable TLB cache entry
> exists. With that assumption, the TLB must be flushed before any IO can
> start or the page is freed to avoid lost writes or data corruption. This
> patch defers flushing of potentially writable TLBs as long as possible.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Acked-by: Rik van Riel <riel@...hat.com>

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