linux-kernel - Re: [PATCH RFC] virtio_balloon: conservative balloon page shrinking

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Message-ID: <20200206062558-mutt-send-email-mst@kernel.org>
Date:   Thu, 6 Feb 2020 06:26:35 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     "Wang, Wei W" <wei.w.wang@...el.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "tysand@...gle.com" <tysand@...gle.com>,
        "david@...hat.com" <david@...hat.com>,
        "alexander.h.duyck@...ux.intel.com" 
        <alexander.h.duyck@...ux.intel.com>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "namit@...are.com" <namit@...are.com>,
        "penguin-kernel@...ove.sakura.ne.jp" 
        <penguin-kernel@...ove.sakura.ne.jp>
Subject: Re: [PATCH RFC] virtio_balloon: conservative balloon page shrinking

On Thu, Feb 06, 2020 at 09:43:10AM +0000, Wang, Wei W wrote:
> On Thursday, February 6, 2020 5:31 PM, Michael S. Tsirkin wrote:
> > 
> > How about just making this a last resort thing to be compatible with existing
> > hypervisors? if someone wants to change behaviour that really should use a
> > feature bit ...
> 
> Yeah, sounds good to me to control via feature bits.
> 
> Best,
> Wei

To clarify, shrinker use could be a feature bit. OOM behaviour was
there for years and has been used to dynamically size guests.

-- 
MST