linux-kernel - Re: [PATCH v2 2/2] virtio_balloon: replace oom notifier with shrinker

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Date:   Thu, 02 Aug 2018 19:27:40 +0800
From:   Wei Wang <wei.w.wang@...el.com>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Michal Hocko <mhocko@...nel.org>
CC:     virtio-dev@...ts.oasis-open.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        mst@...hat.com, akpm@...ux-foundation.org
Subject: Re: [PATCH v2 2/2] virtio_balloon: replace oom notifier with shrinker

On 08/02/2018 07:00 PM, Tetsuo Handa wrote:
> On 2018/08/02 19:32, Wei Wang wrote:
>> On 08/01/2018 07:34 PM, Michal Hocko wrote:
>>> Do you have any numbers for how does this work in practice?
>> It works in this way: for example, we can set the parameter, balloon_pages_to_shrink,
>> to shrink 1GB memory once shrink scan is called. Now, we have a 8GB guest, and we balloon
>> out 7GB. When shrink scan is called, the balloon driver will get back 1GB memory and give
>> them back to mm, then the ballooned memory becomes 6GB.
> Since shrinker might be called concurrently (am I correct?),

Not sure about it being concurrently, but I think it would be called 
repeatedly as should_continue_reclaim() returns true.


Best,
Wei