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

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Message-ID: <E1B69BF2-458D-435C-8065-6944111A9EC6@vmware.com>
Date:   Tue, 30 Oct 2018 16:32:22 +0000
From:   Nadav Amit <namit@...are.com>
To:     Arnd Bergmann <arnd@...db.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     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.

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?

Thanks,
Nadav