cfq-iosched: Get rid of cfqq wait_busy_done flag
o Get rid of wait_busy_done flag. This flag only tells we were doing wait
busy on a queue and that queue got request so expire it. That information
can easily be obtained by (cfq_cfqq_wait_busy() && queue_is_not_empty). So
remove this flag and keep code simple.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index b19cd68..f41fdb5 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -319,7 +319,6 @@
CFQ_CFQQ_FLAG_coop, /* cfqq is shared */
CFQ_CFQQ_FLAG_deep, /* sync cfqq experienced large depth */
CFQ_CFQQ_FLAG_wait_busy, /* Waiting for next request */
- CFQ_CFQQ_FLAG_wait_busy_done, /* Got new request. Expire the queue */
};
#define CFQ_CFQQ_FNS(name) \
@@ -348,7 +347,6 @@
CFQ_CFQQ_FNS(coop);
CFQ_CFQQ_FNS(deep);
CFQ_CFQQ_FNS(wait_busy);
-CFQ_CFQQ_FNS(wait_busy_done);
#undef CFQ_CFQQ_FNS
#ifdef CONFIG_DEBUG_CFQ_IOSCHED
@@ -1574,7 +1572,6 @@
cfq_clear_cfqq_wait_request(cfqq);
cfq_clear_cfqq_wait_busy(cfqq);
- cfq_clear_cfqq_wait_busy_done(cfqq);
/*
* store what was left of this slice, if the queue idled/timed out
@@ -2134,11 +2131,17 @@
if (!cfqd->rq_queued)
return NULL;
+
+ /*
+ * We were waiting for group to get backlogged. Expire the queue
+ */
+ if (cfq_cfqq_wait_busy(cfqq) && !RB_EMPTY_ROOT(&cfqq->sort_list))
+ goto expire;
+
/*
* The active queue has run out of time, expire it and select new.
*/
- if ((cfq_slice_used(cfqq) || cfq_cfqq_wait_busy_done(cfqq))
- && !cfq_cfqq_must_dispatch(cfqq))
+ if (cfq_slice_used(cfqq) && !cfq_cfqq_must_dispatch(cfqq))
goto expire;
/*
@@ -3171,10 +3174,6 @@
cfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq);
if (cfqq == cfqd->active_queue) {
- if (cfq_cfqq_wait_busy(cfqq)) {
- cfq_clear_cfqq_wait_busy(cfqq);
- cfq_mark_cfqq_wait_busy_done(cfqq);
- }
/*
* Remember that we saw a request from this process, but
* don't start queuing just yet. Otherwise we risk seeing lots
