From: Eric Blake <eblake@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>, qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
Peter Maydell <peter.maydell@linaro.org>,
Michael Tokarev <mjt@tls.msk.ru>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [PULL 04/15] oslib: rework anonimous RAM allocation
Date: Fri, 2 Oct 2015 08:18:46 -0600 [thread overview]
Message-ID: <560E9246.2090605@redhat.com> (raw)
In-Reply-To: <1443793405-15190-5-git-send-email-mst@redhat.com>
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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 <mst@redhat.com>
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> Acked-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> util/oslib-posix.c | 12 ++++++++++--
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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next prev parent reply other threads:[~2015-10-02 14:18 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-02 13:44 [Qemu-devel] [PULL 00/15] virtio,pc features, fixes Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 01/15] virtio: introduce virtqueue_unmap_sg() Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 02/15] virtio: introduce virtqueue_discard() Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 03/15] virtio-net: correctly drop truncated packets Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 04/15] oslib: rework anonimous RAM allocation Michael S. Tsirkin
2015-10-02 14:18 ` Eric Blake [this message]
2015-10-02 13:45 ` [Qemu-devel] [PULL 05/15] oslib: allocate PROT_NONE pages on top of RAM Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 06/15] exec: " Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 07/15] pc: Add a comment explaining why pc_compat_2_4() doesn't exist Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 08/15] virtio: Notice when the system doesn't support MSIx at all Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 09/15] virtio-9p: migrate virtio subsections Michael S. Tsirkin
2015-10-02 14:05 ` Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 10/15] vhost-user-test: do not reinvent glib-compat.h Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 11/15] vhost-user: unit test for new messages Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 12/15] memhp: extend address auto assignment to support gaps Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 13/15] pc: memhp: force gaps between DIMM's GPA Michael S. Tsirkin
2015-10-02 13:45 ` [Qemu-devel] [PULL 14/15] vhost-user-test: use tmpfs by default Michael S. Tsirkin
2015-10-05 22:39 ` Peter Maydell
2015-10-05 23:04 ` Michael S. Tsirkin
2015-10-05 23:17 ` Michael S. Tsirkin
2015-10-06 8:41 ` Peter Maydell
2015-10-06 11:07 ` Peter Maydell
2015-10-14 14:01 ` Marc-André Lureau
2015-10-02 13:46 ` [Qemu-devel] [PULL 15/15] vhost-user-test: fix predictable filename on tmpfs Michael S. Tsirkin
2015-10-02 14:06 ` [Qemu-devel] [PULL 00/15] virtio,pc features, fixes Michael S. Tsirkin
2015-10-02 16:06 ` Eric Blake
2015-10-02 16:27 ` Peter Maydell
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