virtio: support unlocked queue kick
authorRusty Russell <rusty@rustcorp.com.au>
Thu, 12 Jan 2012 05:14:43 +0000 (15:14 +1030)
committerRusty Russell <rusty@rustcorp.com.au>
Thu, 12 Jan 2012 05:14:43 +0000 (15:14 +1030)
commit41f0377f73039ca6fe97a469d1941a89cd9757f1
tree380814eb3ad8092069c784539b5b88f8a9506240
parentf96fde41f7f9af6cf20f6a1919f5d9670f84d574
virtio: support unlocked queue kick

Based on patch by Christoph for virtio_blk speedup:

Split virtqueue_kick to be able to do the actual notification
outside the lock protecting the virtqueue.  This patch was
originally done by Stefan Hajnoczi, but I can't find the
original one anymore and had to recreated it from memory.
Pointers to the original or corrections for the commit message
are welcome.

Stefan's patch was here:

https://github.com/stefanha/linux/commit/a6d06644e3a58e57a774e77d7dc34c4a5a2e7496
http://www.spinics.net/lists/linux-virtualization/msg14616.html

Third time's the charm!

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
drivers/virtio/virtio_ring.c
include/linux/virtio.h