| commit | b796fcd1bf2978aed15748db04e054f34789e9eb | |
| author | Vincenzo Maffione <v.maffione@gmail.com> | |
| Sun, 31 Jan 2016 10:29:04 +0000 (31 11:29 +0100) | ||
| committer | Michael S. Tsirkin <mst@redhat.com> | |
| Sat, 6 Feb 2016 18:44:08 +0000 (6 20:44 +0200) | ||
| tree | 93261b84a89e31a55a29472ab256b32b066e0a5c | treesnapshot (tar.gz zip) |
| parent | aa570d6fb6bd0402f27f151a76fb1762e26231ac | commitdiff |
virtio: cache used_idx in a VirtQueue field
Accessing used_idx in the VQ requires an expensive access to
guest physical memory. Before this patch, 3 accesses are normally
done for each pop/push/notify call. However, since the used_idx is
only written by us, we can track it in our internal data structure.
Signed-off-by: Vincenzo Maffione <v.maffione@gmail.com>
Message-Id: <3d062ec54e9a7bf9fb325c1fd693564951f2b319.1450218353.git.v.maffione@gmail.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Accessing used_idx in the VQ requires an expensive access to
guest physical memory. Before this patch, 3 accesses are normally
done for each pop/push/notify call. However, since the used_idx is
only written by us, we can track it in our internal data structure.
Signed-off-by: Vincenzo Maffione <v.maffione@gmail.com>
Message-Id: <3d062ec54e9a7bf9fb325c1fd693564951f2b319.1450218353.git.v.maffione@gmail.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| hw/virtio/virtio.c | diffblobblamehistory |