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

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Message-ID: <553DA3FF.3000304@redhat.com>
Date:	Sun, 26 Apr 2015 22:50:39 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>, Linux-MM <linux-mm@...ck.org>
CC:	Hugh Dickins <hughd@...gle.com>, Minchan Kim <minchan@...nel.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] mm: Defer flush of writable TLB entries

On 04/25/2015 01:45 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>

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

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