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

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Message-ID: <552ED8FF.8000109@intel.com>
Date:	Wed, 15 Apr 2015 14:32:47 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>
CC:	Rik van Riel <riel@...hat.com>, Linux-MM <linux-mm@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	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 04/15/2015 02:28 PM, Mel Gorman wrote:
> This is what I'm expecting i.e. clean->dirty transition is write-through
> to the PTE which is now unmapped and it traps. I'm assuming there is an
> architectural guarantee that it happens but could not find an explicit
> statement in the docs. I'm hoping Dave or Andi can check with the relevant
> people on my behalf.

The docs do look a bit ambiguous to me.  I'm working on getting some
clarified language in there.
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