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CFQ: move think time check variables to a separate struct 

Move the variables to do think time check to a sepatate struct. This is
to prepare adding think time check for service tree and group. No
functional change.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Shaohua Li 2011-07-12 14:24:35 +02:00 committed by Jens Axboe
parent 4aede84b33
commit 383cd7213f
2 changed files with 33 additions and 21 deletions
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40
block/cfq-iosched.c
View File

@ -2008,10 +2008,10 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
* slice, then don't idle. This avoids overrunning the allotted
* time slice.
*/
if (sample_valid(cic->ttime_samples) &&
(cfqq->slice_end - jiffies < cic->ttime_mean)) {
if (sample_valid(cic->ttime.ttime_samples) &&
(cfqq->slice_end - jiffies < cic->ttime.ttime_mean)) {
cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%lu",
cic->ttime_mean);
cic->ttime.ttime_mean);
return;
}
@ -2819,7 +2819,7 @@ cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask)
cic = kmem_cache_alloc_node(cfq_ioc_pool, gfp_mask | __GFP_ZERO,
cfqd->queue->node);
if (cic) {
cic->last_end_request = jiffies;
cic->ttime.last_end_request = jiffies;
INIT_LIST_HEAD(&cic->queue_list);
INIT_HLIST_NODE(&cic->cic_list);
cic->dtor = cfq_free_io_context;
@ -3206,14 +3206,22 @@ err:
}
static void
cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_io_context *cic)
__cfq_update_io_thinktime(struct cfq_ttime *ttime, unsigned long slice_idle)
{
unsigned long elapsed = jiffies - cic->last_end_request;
unsigned long ttime = min(elapsed, 2UL * cfqd->cfq_slice_idle);
unsigned long elapsed = jiffies - ttime->last_end_request;
elapsed = min(elapsed, 2UL * slice_idle);
cic->ttime_samples = (7*cic->ttime_samples + 256) / 8;
cic->ttime_total = (7*cic->ttime_total + 256*ttime) / 8;
cic->ttime_mean = (cic->ttime_total + 128) / cic->ttime_samples;
ttime->ttime_samples = (7*ttime->ttime_samples + 256) / 8;
ttime->ttime_total = (7*ttime->ttime_total + 256*elapsed) / 8;
ttime->ttime_mean = (ttime->ttime_total + 128) / ttime->ttime_samples;
}
static void
cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_queue *cfqq,
struct cfq_io_context *cic)
{
if (cfq_cfqq_sync(cfqq))
__cfq_update_io_thinktime(&cic->ttime, cfqd->cfq_slice_idle);
}
static void
@ -3262,8 +3270,8 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
else if (!atomic_read(&cic->ioc->nr_tasks) || !cfqd->cfq_slice_idle ||
(!cfq_cfqq_deep(cfqq) && CFQQ_SEEKY(cfqq)))
enable_idle = 0;
else if (sample_valid(cic->ttime_samples)) {
if (cic->ttime_mean > cfqd->cfq_slice_idle)
else if (sample_valid(cic->ttime.ttime_samples)) {
if (cic->ttime.ttime_mean > cfqd->cfq_slice_idle)
enable_idle = 0;
else
enable_idle = 1;
@ -3389,7 +3397,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
cfqd->rq_queued++;
cfq_update_io_thinktime(cfqd, cic);
cfq_update_io_thinktime(cfqd, cfqq, cic);
cfq_update_io_seektime(cfqd, cfqq, rq);
cfq_update_idle_window(cfqd, cfqq, cic);
@ -3500,8 +3508,8 @@ static bool cfq_should_wait_busy(struct cfq_data *cfqd, struct cfq_queue *cfqq)
return true;
/* if slice left is less than think time, wait busy */
if (cic && sample_valid(cic->ttime_samples)
&& (cfqq->slice_end - jiffies < cic->ttime_mean))
if (cic && sample_valid(cic->ttime.ttime_samples)
&& (cfqq->slice_end - jiffies < cic->ttime.ttime_mean))
return true;
/*
@ -3542,7 +3550,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--;
if (sync) {
RQ_CIC(rq)->last_end_request = now;
RQ_CIC(rq)->ttime.last_end_request = now;
if (!time_after(rq->start_time + cfqd->cfq_fifo_expire[1], now))
cfqd->last_delayed_sync = now;
}

14
include/linux/iocontext.h
View File

@ -5,6 +5,14 @@
#include <linux/rcupdate.h>
struct cfq_queue;
struct cfq_ttime {
unsigned long last_end_request;
unsigned long ttime_total;
unsigned long ttime_samples;
unsigned long ttime_mean;
};
struct cfq_io_context {
void *key;
@ -12,11 +20,7 @@ struct cfq_io_context {
struct io_context *ioc;
unsigned long last_end_request;
unsigned long ttime_total;
unsigned long ttime_samples;
unsigned long ttime_mean;
struct cfq_ttime ttime;
struct list_head queue_list;
struct hlist_node cic_list;