linux-kernel - Re: [PATCH 2/4] mm: Send a single IPI to TLB flush multiple pages when unmapping

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Message-ID: <552FDABC.3060705@redhat.com>
Date:	Thu, 16 Apr 2015 11:52:28 -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 2/4] mm: Send a single IPI to TLB flush multiple pages
 when unmapping

On 04/16/2015 06:22 AM, Mel Gorman wrote:

> 	If a clean page is unmapped and not immediately flushed, the
> 	architecture must guarantee that a write to that page from a CPU
> 	with a cached TLB entry will trap a page fault.
> 
> This is essentially what the kernel already depends on but the window is
> much larger with this patch applied and is worth highlighting.

> Signed-off-by: Mel Gorman <mgorman@...e.de>

Given the architectural guarantee ...

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

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