From 64521d1a3ba7cc7fe4ab5640da83d88144f05340 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 28 Oct 2005 08:30:39 +0200 Subject: [PATCH] [BLOCK] elevator switch fixes/cleanup - 100msec sleep is a little excessive, lots of requests can complete in that timeframe. Use 10msec instead. - Rename QUEUE_FLAG_BYPASS to QUEUE_FLAG_ELVSWITCH to indicate what is going on. Signed-off-by: Jens Axboe --- drivers/block/elevator.c | 8 ++++---- drivers/block/ll_rw_blk.c | 2 +- include/linux/blkdev.h | 2 +- 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/block/elevator.c b/drivers/block/elevator.c index 272d93946621..cf9bedbb761b 100644 --- a/drivers/block/elevator.c +++ b/drivers/block/elevator.c @@ -671,14 +671,14 @@ static void elevator_switch(request_queue_t *q, struct elevator_type *new_e) */ spin_lock_irq(q->queue_lock); - set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags); + set_bit(QUEUE_FLAG_ELVSWITCH, &q->queue_flags); while (q->elevator->ops->elevator_dispatch_fn(q, 1)) ; while (q->rq.elvpriv) { spin_unlock_irq(q->queue_lock); - msleep(100); + msleep(10); spin_lock_irq(q->queue_lock); } @@ -703,7 +703,7 @@ static void elevator_switch(request_queue_t *q, struct elevator_type *new_e) * finally exit old elevator and turn off BYPASS. */ elevator_exit(old_elevator); - clear_bit(QUEUE_FLAG_BYPASS, &q->queue_flags); + clear_bit(QUEUE_FLAG_ELVSWITCH, &q->queue_flags); return; fail_register: @@ -716,7 +716,7 @@ fail_register: fail: q->elevator = old_elevator; elv_register_queue(q); - clear_bit(QUEUE_FLAG_BYPASS, &q->queue_flags); + clear_bit(QUEUE_FLAG_ELVSWITCH, &q->queue_flags); kfree(e); error: elevator_put(new_e); diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c index f7c9931cb380..fc12d019b19d 100644 --- a/drivers/block/ll_rw_blk.c +++ b/drivers/block/ll_rw_blk.c @@ -1940,7 +1940,7 @@ get_rq: if (rl->count[rw] >= queue_congestion_on_threshold(q)) set_queue_congested(q, rw); - priv = !test_bit(QUEUE_FLAG_BYPASS, &q->queue_flags); + priv = !test_bit(QUEUE_FLAG_ELVSWITCH, &q->queue_flags); if (priv) rl->elvpriv++; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 6186d5e2110f..7d9d14d6d8f9 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -442,7 +442,7 @@ enum { #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ -#define QUEUE_FLAG_BYPASS 8 /* don't use elevator, just do FIFO */ +#define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ #define QUEUE_FLAG_FLUSH 9 /* doing barrier flush sequence */ #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags)