On Wed, Dec 21, 2011 at 1:00 AM, Minchan Kim minc...@kernel.org wrote:
+static void virtblk_add_buf_wait(struct virtio_blk *vblk,
+ struct virtblk_req *vbr, unsigned long out, unsigned long in)
+{
+ DEFINE_WAIT(wait);
+ bool retry, notify;
+
+ for (;;) {
+
On Thu, Dec 22, 2011 at 12:20:01PM +, Stefan Hajnoczi wrote:
virtblk_make_request() checks that the queue is not plugged. Do we
need to do that here too?
biot based drivers don't have a queue that could be plugged.
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Change I/O path from request-based to bio-based for virtio-blk.
This is required for high IOPs devices which get slowed down to 1/5th of
the native speed by all the locking, memory allocation and other overhead
in the request based I/O path.
But it still supports request-based IO path for scsi
