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authorJeff Moyer <jmoyer@redhat.com>2009-10-23 17:14:51 -0400
committerJens Axboe <jens.axboe@oracle.com>2009-10-26 14:34:47 +0100
commitb3b6d0408c953524f979468562e7e210d8634150 (patch)
tree1556cb393f2edc09e64c8961f6792cbb79b4e288 /block
parentdf5fe3e8e13883f58dc97489076bbcc150789a21 (diff)
cfq: change the meaning of the cfqq_coop flag
The flag used to indicate that a cfqq was allowed to jump ahead in the scheduling order due to submitting a request close to the queue that just executed. Since closely cooperating queues are now merged, the flag holds little meaning. Change it to indicate that multiple queues were merged. This will later be used to allow the breaking up of merged queues when they are no longer cooperating. Signed-off-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
-rw-r--r--block/cfq-iosched.c20
1 files changed, 6 insertions, 14 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index f0994aedb39..5e01a0a92c0 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -202,7 +202,7 @@ enum cfqq_state_flags {
CFQ_CFQQ_FLAG_prio_changed, /* task priority has changed */
CFQ_CFQQ_FLAG_slice_new, /* no requests dispatched in slice */
CFQ_CFQQ_FLAG_sync, /* synchronous queue */
- CFQ_CFQQ_FLAG_coop, /* has done a coop jump of the queue */
+ CFQ_CFQQ_FLAG_coop, /* cfqq is shared */
};
#define CFQ_CFQQ_FNS(name) \
@@ -950,11 +950,8 @@ static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd)
static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd,
struct cfq_queue *cfqq)
{
- if (!cfqq) {
+ if (!cfqq)
cfqq = cfq_get_next_queue(cfqd);
- if (cfqq)
- cfq_clear_cfqq_coop(cfqq);
- }
__cfq_set_active_queue(cfqd, cfqq);
return cfqq;
@@ -1035,8 +1032,7 @@ static struct cfq_queue *cfqq_close(struct cfq_data *cfqd,
* assumption.
*/
static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd,
- struct cfq_queue *cur_cfqq,
- bool probe)
+ struct cfq_queue *cur_cfqq)
{
struct cfq_queue *cfqq;
@@ -1055,11 +1051,6 @@ static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd,
if (!cfq_cfqq_sync(cfqq))
return NULL;
- if (cfq_cfqq_coop(cfqq))
- return NULL;
-
- if (!probe)
- cfq_mark_cfqq_coop(cfqq);
return cfqq;
}
@@ -1243,7 +1234,7 @@ static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd)
* cooperators and put the close queue at the front of the service
* tree. If possible, merge the expiring queue with the new cfqq.
*/
- new_cfqq = cfq_close_cooperator(cfqd, cfqq, 0);
+ new_cfqq = cfq_close_cooperator(cfqd, cfqq);
if (new_cfqq) {
if (!cfqq->new_cfqq)
cfq_setup_merge(cfqq, new_cfqq);
@@ -2294,7 +2285,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
*/
if (cfq_slice_used(cfqq) || cfq_class_idle(cfqq))
cfq_slice_expired(cfqd, 1);
- else if (cfqq_empty && !cfq_close_cooperator(cfqd, cfqq, 1) &&
+ else if (cfqq_empty && !cfq_close_cooperator(cfqd, cfqq) &&
sync && !rq_noidle(rq))
cfq_arm_slice_timer(cfqd);
}
@@ -2395,6 +2386,7 @@ cfq_merge_cfqqs(struct cfq_data *cfqd, struct cfq_io_context *cic,
{
cfq_log_cfqq(cfqd, cfqq, "merging with queue %p", cfqq->new_cfqq);
cic_set_cfqq(cic, cfqq->new_cfqq, 1);
+ cfq_mark_cfqq_coop(cfqq->new_cfqq);
cfq_put_queue(cfqq);
return cic_to_cfqq(cic, 1);
}