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qemu/hw/virtio
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Vincenzo Maffione b796fcd1bf 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>
2016-02-06 20:44:08 +02:00
..
dataplane vring: slim down allocation of VirtQueueElements 2016-02-06 20:44:08 +02:00
Makefile.objs dataplane: endianness-aware accesses 2015-02-16 15:07:16 +00:00
vhost-backend.c virtio: Clean up includes 2016-01-29 15:07:23 +00:00
vhost-user.c virtio: Clean up includes 2016-01-29 15:07:23 +00:00
vhost.c virtio: Clean up includes 2016-01-29 15:07:23 +00:00
virtio-balloon.c virtio: move allocation to virtqueue_pop/vring_pop 2016-02-06 20:39:07 +02:00
virtio-bus.c virtio: Clean up includes 2016-01-29 15:07:23 +00:00
virtio-mmio.c virtio: Clean up includes 2016-01-29 15:07:23 +00:00
virtio-pci.c virtio: Clean up includes 2016-01-29 15:07:23 +00:00
virtio-pci.h 9pfs: introduce V9fsVirtioState 2016-01-12 11:04:14 +05:30
virtio-rng.c virtio: move allocation to virtqueue_pop/vring_pop 2016-02-06 20:39:07 +02:00
virtio.c virtio: cache used_idx in a VirtQueue field 2016-02-06 20:44:08 +02:00