diff options
| author | kaf24@firebug.cl.cam.ac.uk <kaf24@firebug.cl.cam.ac.uk> | 2005-12-04 18:20:41 +0100 |
|---|---|---|
| committer | kaf24@firebug.cl.cam.ac.uk <kaf24@firebug.cl.cam.ac.uk> | 2005-12-04 18:20:41 +0100 |
| commit | 1e4b462e21ccdf69ef19152374b28a4f5df03701 (patch) | |
| tree | a5782c72240b52729ef37beff52368dae295d982 | |
| parent | 55f8d24f80a222b0494b8545eece615a03d45062 (diff) | |
| download | xen-1e4b462e21ccdf69ef19152374b28a4f5df03701.tar.gz xen-1e4b462e21ccdf69ef19152374b28a4f5df03701.tar.bz2 xen-1e4b462e21ccdf69ef19152374b28a4f5df03701.zip | |
Pull requests from blkfront into blkback a bit more
aggressively, to keep the scheduling pipeline filled.
Signed-off-by: Keir Fraser <keir@xensource.com>
| -rw-r--r-- | linux-2.6-xen-sparse/drivers/xen/blkback/blkback.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/linux-2.6-xen-sparse/drivers/xen/blkback/blkback.c b/linux-2.6-xen-sparse/drivers/xen/blkback/blkback.c index fcc6c12de4..d9aee65e69 100644 --- a/linux-2.6-xen-sparse/drivers/xen/blkback/blkback.c +++ b/linux-2.6-xen-sparse/drivers/xen/blkback/blkback.c @@ -493,12 +493,12 @@ static void make_response(blkif_t *blkif, unsigned long id, blk_ring->rsp_prod_pvt++; RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(blk_ring, notify); - /* - * Tail check for pending requests. Allows frontend to avoid - * notifications if requests are already in flight (lower overheads - * and promotes batching). - */ if (blk_ring->rsp_prod_pvt == blk_ring->req_cons) { + /* + * Tail check for pending requests. Allows frontend to avoid + * notifications if requests are already in flight (lower + * overheads and promotes batching). + */ int more_to_do; RING_FINAL_CHECK_FOR_REQUESTS(blk_ring, more_to_do); if (more_to_do) { @@ -506,6 +506,12 @@ static void make_response(blkif_t *blkif, unsigned long id, maybe_trigger_blkio_schedule(); } } + else if (!__on_blkdev_list(blkif) + && RING_HAS_UNCONSUMED_REQUESTS(blk_ring)) { + /* Keep pulling requests as they become available... */ + add_to_blkdev_list_tail(blkif); + maybe_trigger_blkio_schedule(); + } spin_unlock_irqrestore(&blkif->blk_ring_lock, flags); |