linux-kernel - Re: [RFC PATCH 2/3] virtio-balloon: add support for providing free huge page reports to host

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Message-ID: <CA+2MQi-qXS4BHwDuxJXN52GyA67+kv9iCoasg2knRg5ytxp1vA@mail.gmail.com>
Date:   Tue, 22 Dec 2020 19:39:08 +0800
From:   Liang Li <liliang324@...il.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Michal Hocko <mhocko@...e.com>,
        Liang Li <liliangleo@...iglobal.com>,
        Mike Kravetz <mike.kravetz@...cle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, qemu-devel@...gnu.org
Subject: Re: [RFC PATCH 2/3] virtio-balloon: add support for providing free
 huge page reports to host

On Tue, Dec 22, 2020 at 4:28 PM David Hildenbrand <david@...hat.com> wrote:
>
> On 22.12.20 08:48, Liang Li wrote:
> > Free page reporting only supports buddy pages, it can't report the
> > free pages reserved for hugetlbfs case. On the other hand, hugetlbfs
>
> The virtio-balloon free page reporting interface accepts a generic sg,
> so it isn't glue to buddy pages. There is no need for a new interface.

OK, then there will be two workers accessing the same vq, we can add a
lock for concurrent access.

Thanks!

Liang