linux-kernel - Re: [PATCH v3 00/20] vmw_balloon: compaction, shrinker, 64-bit, etc.

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Date:   Tue, 30 Oct 2018 18:05:43 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Nadav Amit <namit@...are.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Xavier Deguillard <xdeguillard@...are.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH v3 00/20] vmw_balloon: compaction, shrinker, 64-bit, etc.

On Tue, Oct 30, 2018 at 04:52:55PM +0000, Nadav Amit wrote:
> From: gregkh@...uxfoundation.org
> Sent: October 30, 2018 at 4:51:19 PM GMT
> > To: Nadav Amit <namit@...are.com>
> > Cc: Arnd Bergmann <arnd@...db.de>, Xavier Deguillard <xdeguillard@...are.com>, LKML <linux-kernel@...r.kernel.org>, Michael S. Tsirkin <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, linux-mm@...ck.org <linux-mm@...ck.org>, virtualization@...ts.linux-foundation.org <virtualization@...ts.linux-foundation.org>
> > Subject: Re: [PATCH v3 00/20] vmw_balloon: compaction, shrinker, 64-bit, etc.
> > 
> > 
> > On Tue, Oct 30, 2018 at 04:32:22PM +0000, Nadav Amit wrote:
> >> From: Nadav Amit
> >> Sent: September 26, 2018 at 7:13:16 PM GMT
> >>> To: Arnd Bergmann <arnd@...db.de>, gregkh@...uxfoundation.org
> >>> Cc: Xavier Deguillard <xdeguillard@...are.com>, linux-kernel@...r.kernel.org>, Nadav Amit <namit@...are.com>, Michael S. Tsirkin <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, linux-mm@...ck.org>, virtualization@...ts.linux-foundation.org
> >>> Subject: [PATCH v3 00/20] vmw_balloon: compaction, shrinker, 64-bit, etc.
> >>> 
> >>> 
> >>> This patch-set adds the following enhancements to the VMware balloon
> >>> driver:
> >>> 
> >>> 1. Balloon compaction support.
> >>> 2. Report the number of inflated/deflated ballooned pages through vmstat.
> >>> 3. Memory shrinker to avoid balloon over-inflation (and OOM).
> >>> 4. Support VMs with memory limit that is greater than 16TB.
> >>> 5. Faster and more aggressive inflation.
> >>> 
> >>> To support compaction we wish to use the existing infrastructure.
> >>> However, we need to make slight adaptions for it. We add a new list
> >>> interface to balloon-compaction, which is more generic and efficient,
> >>> since it does not require as many IRQ save/restore operations. We leave
> >>> the old interface that is used by the virtio balloon.
> >>> 
> >>> Big parts of this patch-set are cleanup and documentation. Patches 1-13
> >>> simplify the balloon code, document its behavior and allow the balloon
> >>> code to run concurrently. The support for concurrency is required for
> >>> compaction and the shrinker interface.
> >>> 
> >>> For documentation we use the kernel-doc format. We are aware that the
> >>> balloon interface is not public, but following the kernel-doc format may
> >>> be useful one day.
> >>> 
> >>> v2->v3: * Moving the balloon magic-number out of uapi (Greg)
> >>> 
> >>> v1->v2:	* Fix build error when THP is off (kbuild)
> >>> 	* Fix build error on i386 (kbuild)
> >> 
> >> Greg,
> >> 
> >> I realize you didn’t apply patches 17-20. Any reason for that?
> > 
> > I have no idea, that was a few thousand patches reviewed ago...
> > 
> > Did I not say anything about this when I applied them?
> > 
> > greg k-h
> 
> You regarded the magic-number in v2, which I fixed for v3.
> 
> Should I resend?

Please do, but note that I will not be reviewing anything until after
4.20-rc1 is out.

thanks,

greg k-h