linux-kernel - Re: [RFC][PATCH 0/2] s390/kvm: add kvm support for guest page hinting v2

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Message-ID: <51F101A0.3050104@de.ibm.com>
Date:	Thu, 25 Jul 2013 12:44:48 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Nick Piggin <npiggin@...nel.dk>,
	Hugh Dickins <hughd@...gle.com>, Rik van Riel <riel@...hat.com>
Subject: Re: [RFC][PATCH 0/2] s390/kvm: add kvm support for guest page hinting
 v2

On 25/07/13 10:54, Martin Schwidefsky wrote:
> v1->v2:
>  - found a way to simplify the common code patch
> 
> Linux on s390 as a guest under z/VM has been using the guest page
> hinting interface (alias collaborative memory management) for a long
> time. The full version with volatile states has been deemed to be too
> complicated (see the old discussion about guest page hinting e.g. on
> http://marc.info/?l=linux-mm&m=123816662017742&w=2).
> What is currently implemented for the guest is the unused and stable
> states to mark unallocated pages as freely available to the host.
> This works just fine with z/VM as the host.
> 
> The two patches in this series implement the guest page hinting
> interface for the unused and stable states in the KVM host.
> Most of the code specific to s390 but there is a common memory
> management part as well, see patch #1.
> 
> The code is working stable now, from my point of view this is ready
> for prime-time.
> 
> Konstantin Weitz (2):
>   mm: add support for discard of unused ptes
>   s390/kvm: support collaborative memory management

Can you also add the patch from our tree that reset the usage states
on reboot (diag 308 subcode 3 and 4)?

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