linux-kernel - Re: [PATCH 1/5] mmu_notifier: add event information to address invalidation v5

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Message-ID: <545BACF4.2080808@redhat.com>
Date:	Thu, 06 Nov 2014 12:16:36 -0500
From:	Rik van Riel <riel@...hat.com>
To:	j.glisse@...il.com, akpm@...ux-foundation.org
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	joro@...tes.org, Mel Gorman <mgorman@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Dave Airlie <airlied@...hat.com>,
	Brendan Conoboy <blc@...hat.com>,
	Joe Donohue <jdonohue@...hat.com>,
	Duncan Poole <dpoole@...dia.com>,
	Sherry Cheung <SCheung@...dia.com>,
	Subhash Gutti <sgutti@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Lucien Dunning <ldunning@...dia.com>,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Arvind Gopalakrishnan <arvindg@...dia.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Liran Liss <liranl@...lanox.com>,
	Roland Dreier <roland@...estorage.com>,
	Ben Sander <ben.sander@....com>,
	Greg Stoner <Greg.Stoner@....com>,
	John Bridgman <John.Bridgman@....com>,
	Michael Mantor <Michael.Mantor@....com>,
	Paul Blinzer <Paul.Blinzer@....com>,
	Laurent Morichetti <Laurent.Morichetti@....com>,
	Alexander Deucher <Alexander.Deucher@....com>,
	Oded Gabbay <Oded.Gabbay@....com>,
	Jérôme Glisse <jglisse@...hat.com>
Subject: Re: [PATCH 1/5] mmu_notifier: add event information to address invalidation
 v5

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On 11/03/2014 03:42 PM, j.glisse@...il.com wrote:
> From: Jérôme Glisse <jglisse@...hat.com>
> 
> The event information will be usefull for new user of mmu_notifier
> API. The event argument differentiate between a vma disappearing, a
> page being write protected or simply a page being unmaped. This
> allow new user to take different path for different event for
> instance on unmap the resource used to track a vma are still valid
> and should stay around. While if the event is saying that a vma is
> being destroy it means that any resources used to track this vma
> can be free.

Looks good. All I found was one spelling mistake :)

> + *   - MMU_WRITE_BACK: memory is being written back to disk, all
> write accesses + *     must stop after invalidate_range_start
> callback returns. Read access are + *     still allowed. + * + *
> - MMU_WRITE_PROTECT: memory is being writte protected (ie should be
> mapped

                                             "write protected"

> + *     read only no matter what the vma memory protection allows).
> All write + *     accesses must stop after invalidate_range_start
> callback returns. Read + *     access are still allowed.

After fixing the spelling mistake, feel free to add my

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

- -- 
All rights reversed
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