From 28f95cbc3ec01f2c7d248e1a4a384f37e9c2ab16 Mon Sep 17 00:00:00 2001
From: Jens Axboe <jens.axboe@oracle.com>
Date: Fri, 19 Jan 2007 12:09:53 +1100
Subject: [PATCH] cfq-iosched: remove the implicit queue kicking in slice
expire
We only really need it for a process going away, so move it to
those locations.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
block/cfq-iosched.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index bf571b2b7d76..6aa5523f514c 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -693,9 +693,6 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
if (cfq_cfqq_wait_request(cfqq))
del_timer(&cfqd->idle_slice_timer);
- if (!preempted && !cfq_cfqq_dispatched(cfqq))
- cfq_schedule_dispatch(cfqd);
-
cfq_clear_cfqq_must_dispatch(cfqq);
cfq_clear_cfqq_wait_request(cfqq);
cfq_clear_cfqq_queue_new(cfqq);
@@ -1102,8 +1099,10 @@ static void cfq_put_queue(struct cfq_queue *cfqq)
BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]);
BUG_ON(cfq_cfqq_on_rr(cfqq));
- if (unlikely(cfqd->active_queue == cfqq))
+ if (unlikely(cfqd->active_queue == cfqq)) {
__cfq_slice_expired(cfqd, cfqq, 0, 0);
+ cfq_schedule_dispatch(cfqd);
+ }
/*
* it's on the empty list and still hashed
@@ -1158,8 +1157,10 @@ static void cfq_free_io_context(struct io_context *ioc)
static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq)
{
- if (unlikely(cfqq == cfqd->active_queue))
+ if (unlikely(cfqq == cfqd->active_queue)) {
__cfq_slice_expired(cfqd, cfqq, 0, 0);
+ cfq_schedule_dispatch(cfqd);
+ }
cfq_put_queue(cfqq);
}
@@ -1565,7 +1566,6 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
cfq_clear_cfqq_idle_window(cfqq);
}
-
/*
* Check if new_cfqq should preempt the currently active queue. Return 0 for
* no or if we aren't sure, a 1 will cause a preempt.
--
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