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Re: [Qemu-devel] [PULL 04/15] oslib: rework anonimous RAM allocation
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] [PULL 04/15] oslib: rework anonimous RAM allocation |
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Date: |
Fri, 2 Oct 2015 08:18:46 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 |
On 10/02/2015 07:45 AM, Michael S. Tsirkin wrote:
If it's not too late, s/anonimous/anonymous/ in the subject line
> At the moment we first allocate RAM, sometimes more than necessary for
> alignment reasons. We then free the extra RAM.
>
> Rework this to avoid the temporary allocation: reserve the
> range by mapping it with PROT_NONE, then use just the
> necessary range with MAP_FIXED.
>
> Signed-off-by: Michael S. Tsirkin <address@hidden>
> Reviewed-by: Paolo Bonzini <address@hidden>
> Acked-by: Paolo Bonzini <address@hidden>
> ---
> util/oslib-posix.c | 12 ++++++++++--
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- [Qemu-devel] [PULL 12/15] memhp: extend address auto assignment to support gaps, (continued)
- [Qemu-devel] [PULL 12/15] memhp: extend address auto assignment to support gaps, Michael S. Tsirkin, 2015/10/08
- [Qemu-devel] [PULL 07/15] pc: Add a comment explaining why pc_compat_2_4() doesn't exist, Michael S. Tsirkin, 2015/10/08
- [Qemu-devel] [PULL 03/15] virtio-net: correctly drop truncated packets, Michael S. Tsirkin, 2015/10/08
- [Qemu-devel] [PULL 05/15] oslib: allocate PROT_NONE pages on top of RAM, Michael S. Tsirkin, 2015/10/08
- [Qemu-devel] [PULL 10/15] vhost-user-test: do not reinvent glib-compat.h, Michael S. Tsirkin, 2015/10/08
- [Qemu-devel] [PULL 13/15] pc: memhp: force gaps between DIMM's GPA, Michael S. Tsirkin, 2015/10/08
- [Qemu-devel] [PULL 02/15] virtio: introduce virtqueue_discard(), Michael S. Tsirkin, 2015/10/08
- [Qemu-devel] [PULL 09/15] virtio-9p: migrate virtio subsections, Michael S. Tsirkin, 2015/10/08
- [Qemu-devel] [PULL 04/15] oslib: rework anonimous RAM allocation, Michael S. Tsirkin, 2015/10/08
- Re: [Qemu-devel] [PULL 04/15] oslib: rework anonimous RAM allocation,
Eric Blake <=
- [Qemu-devel] [PULL 15/15] vhost-user-test: fix predictable filename on tmpfs, Michael S. Tsirkin, 2015/10/08
- [Qemu-devel] [PULL 14/15] vhost-user-test: use tmpfs by default, Michael S. Tsirkin, 2015/10/08
Re: [Qemu-devel] [PULL 00/15] virtio,pc features, fixes, Michael S. Tsirkin, 2015/10/08