linux-kernel - Re: [PATCH v9 2/5] virtio-balloon: VIRTIO_BALLOON_F_BALLOON

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Date:   Thu, 13 Apr 2017 10:03:46 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Wei Wang <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, david@...hat.com, dave.hansen@...el.com,
        cornelia.huck@...ibm.com, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, aarcange@...hat.com,
        amit.shah@...hat.com, pbonzini@...hat.com,
        liliang.opensource@...il.com
Subject: Re: [PATCH v9 2/5] virtio-balloon: VIRTIO_BALLOON_F_BALLOON_CHUNKS

On Thu, Apr 13, 2017 at 07:34:19PM +0300, Michael S. Tsirkin wrote:
> So we don't need the bitmap to talk to host, it is just
> a data structure we chose to maintain lists of pages, right?
> OK as far as it goes but you need much better isolation for it.
> Build a data structure with APIs such as _init, _cleanup, _add, _clear,
> _find_first, _find_next.
> Completely unrelated to pages, it just maintains bits.
> Then use it here.

That sounds an awful lot like the xbitmap I wrote a few months ago ...

http://git.infradead.org/users/willy/linux-dax.git/commit/727e401bee5ad7d37e0077291d90cc17475c6392