linux-kernel - Re: [PATCH v3 2/2] virtio_balloon: replace oom notifier with shrinker

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Message-ID: <c8d25019-1990-f0dd-c83d-e4def5b5f7fe@i-love.sakura.ne.jp>
Date:   Mon, 6 Aug 2018 19:29:17 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     virtio-dev@...ts.oasis-open.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        mst@...hat.com, mhocko@...nel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v3 2/2] virtio_balloon: replace oom notifier with shrinker

On 2018/08/06 18:56, Wei Wang wrote:
> On 08/03/2018 08:11 PM, Tetsuo Handa wrote:
>> On 2018/08/03 17:32, Wei Wang wrote:
>>> +static int virtio_balloon_register_shrinker(struct virtio_balloon *vb)
>>> +{
>>> +    vb->shrinker.scan_objects = virtio_balloon_shrinker_scan;
>>> +    vb->shrinker.count_objects = virtio_balloon_shrinker_count;
>>> +    vb->shrinker.batch = 0;
>>> +    vb->shrinker.seeks = DEFAULT_SEEKS;
>> Why flags field is not set? If vb is allocated by kmalloc(GFP_KERNEL)
>> and is nowhere zero-cleared, KASAN would complain it.
> 
> Could you point where in the code that would complain it?
> I only see two shrinker flags (NUMA_AWARE and MEMCG_AWARE), and they seem not related to that.

Where is vb->shrinker.flags initialized?