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author | Rusty Russell <rusty@rustcorp.com.au> | 2013-03-20 15:37:09 +1030 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2013-03-20 15:43:29 +1030 |
commit | 13816c768d46586e925b22736992258d6105ad2c (patch) | |
tree | fffb6c71e49b040f532885e6311c5d4886c5d219 /include/linux/virtio.h | |
parent | c8164d8931fdee9ac5314708c4071adf1d997425 (diff) | |
download | linux-stable-13816c768d46586e925b22736992258d6105ad2c.tar.gz linux-stable-13816c768d46586e925b22736992258d6105ad2c.tar.bz2 linux-stable-13816c768d46586e925b22736992258d6105ad2c.zip |
virtio_ring: virtqueue_add_sgs, to add multiple sgs.
virtio_scsi can really use this, to avoid the current hack of copying
the whole sg array. Some other things get slightly neater, too.
This causes a slowdown in virtqueue_add_buf(), which is implemented as
a wrapper. This is addressed in the next patches.
for i in `seq 50`; do /usr/bin/time -f 'Wall time:%e' ./vringh_test --indirect --eventidx --parallel --fast-vringh; done 2>&1 | stats --trim-outliers:
Before:
Using CPUS 0 and 3
Guest: notified 0, pinged 39009-39063(39062)
Host: notified 39009-39063(39062), pinged 0
Wall time:1.700000-1.950000(1.723542)
After:
Using CPUS 0 and 3
Guest: notified 0, pinged 39062-39063(39063)
Host: notified 39062-39063(39063), pinged 0
Wall time:1.760000-2.220000(1.789167)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Reviewed-by: Asias He <asias@redhat.com>
Diffstat (limited to 'include/linux/virtio.h')
-rw-r--r-- | include/linux/virtio.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 5d5b3abc283d..ac80288b2920 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -41,6 +41,13 @@ int virtqueue_add_buf(struct virtqueue *vq, void *data, gfp_t gfp); +int virtqueue_add_sgs(struct virtqueue *vq, + struct scatterlist *sgs[], + unsigned int out_sgs, + unsigned int in_sgs, + void *data, + gfp_t gfp); + void virtqueue_kick(struct virtqueue *vq); bool virtqueue_kick_prepare(struct virtqueue *vq); |