linux-kernel - Re: [PATCH v2 00/20] vmw_balloon: compaction, shrinker, 64-bit, etc.

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Message-ID: <4E03488E-E9EC-4676-A008-C89BC61CD05A@vmware.com>
Date:   Tue, 25 Sep 2018 19:55:56 +0000
From:   Nadav Amit <namit@...are.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Arnd Bergmann <arnd@...db.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Xavier Deguillard <xdeguillard@...are.com>,
        "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 v2 00/20] vmw_balloon: compaction, shrinker, 64-bit, etc.

at 11:15 AM, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> On Thu, Sep 20, 2018 at 10:30:06AM -0700, Nadav Amit wrote:
>> 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.
> 
> I applied the first 16 patches.  Please fix up 17 and resend.

Thanks. I will update it and resend later today.

Regards,
Nadav