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Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on t
From: |
Rik van Riel |
Subject: |
Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list |
Date: |
Tue, 20 Jun 2017 12:44:09 -0400 |
On Mon, 2017-06-12 at 07:10 -0700, Dave Hansen wrote:
> The hypervisor is going to throw away the contents of these pages,
> right? As soon as the spinlock is released, someone can allocate a
> page, and put good data in it. What keeps the hypervisor from
> throwing
> away good data?
That looks like it may be the wrong API, then?
We already have hooks called arch_free_page and
arch_alloc_page in the VM, which are called when
pages are freed, and allocated, respectively.
Nitesh Lal (on the CC list) is working on a way
to efficiently batch recently freed pages for
free page hinting to the hypervisor.
If that is done efficiently enough (eg. with
MADV_FREE on the hypervisor side for lazy freeing,
and lazy later re-use of the pages), do we still
need the harder to use batch interface from this
patch?
--
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- [Qemu-devel] [PATCH v11 0/6] Virtio-balloon Enhancement, Wei Wang, 2017/06/09
- [Qemu-devel] [PATCH v11 1/6] virtio-balloon: deflate via a page list, Wei Wang, 2017/06/09
- [Qemu-devel] [PATCH v11 2/6] virtio-balloon: coding format cleanup, Wei Wang, 2017/06/09
- [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Wei Wang, 2017/06/09
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Dave Hansen, 2017/06/12
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Michael S. Tsirkin, 2017/06/12
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Dave Hansen, 2017/06/12
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Michael S. Tsirkin, 2017/06/12
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Dave Hansen, 2017/06/12
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Wei Wang, 2017/06/12
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list,
Rik van Riel <=
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, David Hildenbrand, 2017/06/20
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Rik van Riel, 2017/06/20
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Michael S. Tsirkin, 2017/06/20
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Rik van Riel, 2017/06/20
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Michael S. Tsirkin, 2017/06/21
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Wei Wang, 2017/06/21
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Michael S. Tsirkin, 2017/06/20
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, David Hildenbrand, 2017/06/20
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, Michael S. Tsirkin, 2017/06/20
- Re: [Qemu-devel] [PATCH v11 4/6] mm: function to offer a page block on the free list, David Hildenbrand, 2017/06/20