Messages in this thread Patch in this message | | | Subject | [PATCH 2/3] virtio_blk: set queue paravirt flag | From | Fernando Luis Vázquez Cao <> | Date | Mon, 27 Oct 2008 18:45:15 +0900 |
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As a paravirt front-end driver, virtio_blk is not a rotational device so we want do avoid idling in AS/CFQ. Tell the block layer about this.
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> ---
diff -urNp linux-2.6.28-rc2-orig/drivers/block/virtio_blk.c linux-2.6.28-rc2/drivers/block/virtio_blk.c --- linux-2.6.28-rc2-orig/drivers/block/virtio_blk.c 2008-10-27 17:41:53.000000000 +0900 +++ linux-2.6.28-rc2/drivers/block/virtio_blk.c 2008-10-27 17:34:32.000000000 +0900 @@ -237,6 +237,8 @@ static int virtblk_probe(struct virtio_d goto out_put_disk; } + queue_flag_set_unlocked(QUEUE_FLAG_VIRT, vblk->disk->queue); + if (index < 26) { sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26); } else if (index < (26 + 1) * 26) {
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