diff options
| author | Asias He <asias@redhat.com> | 2012-03-30 11:24:10 +0800 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2012-05-22 12:16:14 +0930 |
| commit | f65ca1dc6a8c81c6bd72297d4399ec5f4c1f3a01 (patch) | |
| tree | e2c1fe6ebc2ec6a9ee6b31f06404b5df2b9f6b3d /drivers/block/virtio_blk.c | |
| parent | b79d866c8b7014a51f611a64c40546109beaf24a (diff) | |
| download | linux-f65ca1dc6a8c81c6bd72297d4399ec5f4c1f3a01.tar.gz linux-f65ca1dc6a8c81c6bd72297d4399ec5f4c1f3a01.tar.xz | |
virtio_blk: Drop unused request tracking list
Benchmark shows small performance improvement on fusion io device.
Before:
seq-read : io=1,024MB, bw=19,982KB/s, iops=39,964, runt= 52475msec
seq-write: io=1,024MB, bw=20,321KB/s, iops=40,641, runt= 51601msec
rnd-read : io=1,024MB, bw=15,404KB/s, iops=30,808, runt= 68070msec
rnd-write: io=1,024MB, bw=14,776KB/s, iops=29,552, runt= 70963msec
After:
seq-read : io=1,024MB, bw=20,343KB/s, iops=40,685, runt= 51546msec
seq-write: io=1,024MB, bw=20,803KB/s, iops=41,606, runt= 50404msec
rnd-read : io=1,024MB, bw=16,221KB/s, iops=32,442, runt= 64642msec
rnd-write: io=1,024MB, bw=15,199KB/s, iops=30,397, runt= 68991msec
Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/block/virtio_blk.c')
| -rw-r--r-- | drivers/block/virtio_blk.c | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 9d2223bba90c..693187df7601 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -29,9 +29,6 @@ struct virtio_blk /* The disk structure for the kernel. */ struct gendisk *disk; - /* Request tracking. */ - struct list_head reqs; - mempool_t *pool; /* Process context for config space updates */ @@ -55,7 +52,6 @@ struct virtio_blk struct virtblk_req { - struct list_head list; struct request *req; struct virtio_blk_outhdr out_hdr; struct virtio_scsi_inhdr in_hdr; @@ -99,7 +95,6 @@ static void blk_done(struct virtqueue *vq) } __blk_end_request_all(vbr->req, error); - list_del(&vbr->list); mempool_free(vbr, vblk->pool); } /* In case queue is stopped waiting for more buffers. */ @@ -184,7 +179,6 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk, return false; } - list_add_tail(&vbr->list, &vblk->reqs); return true; } @@ -437,7 +431,6 @@ static int __devinit virtblk_probe(struct virtio_device *vdev) goto out_free_index; } - INIT_LIST_HEAD(&vblk->reqs); spin_lock_init(&vblk->lock); vblk->vdev = vdev; vblk->sg_elems = sg_elems; @@ -591,9 +584,6 @@ static void __devexit virtblk_remove(struct virtio_device *vdev) vblk->config_enable = false; mutex_unlock(&vblk->config_lock); - /* Nothing should be pending. */ - BUG_ON(!list_empty(&vblk->reqs)); - /* Stop all the virtqueues. */ vdev->config->reset(vdev); |