linux-kernel - Re: [PATCH v21 2/5 RESEND] virtio-balloon: VIRTIO_BALLOON_F

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Message-Id: <201801092342.FCH56215.LJHOMVFFFOOSQt@I-love.SAKURA.ne.jp>
Date:   Tue, 9 Jan 2018 23:42:16 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     wei.w.wang@...el.com, virtio-dev@...ts.oasis-open.org,
        linux-kernel@...r.kernel.org, qemu-devel@...gnu.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, mst@...hat.com, mhocko@...nel.org,
        akpm@...ux-foundation.org, mawilcox@...rosoft.com
Cc:     david@...hat.com, cornelia.huck@...ibm.com,
        mgorman@...hsingularity.net, aarcange@...hat.com,
        amit.shah@...hat.com, pbonzini@...hat.com, willy@...radead.org,
        liliang.opensource@...il.com, yang.zhang.wz@...il.com,
        quan.xu0@...il.com, nilal@...hat.com, riel@...hat.com
Subject: Re: [PATCH v21 2/5 RESEND] virtio-balloon: VIRTIO_BALLOON_F_SG

Wei Wang wrote:
> - enable OOM to free inflated pages maintained in the local temporary
>   list.

I do want to see it before applying this patch.

Please carefully check how the xbitmap implementation works, and you will
find that you are adding a lot of redundant operations with a bug.