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cfq: pass around cfq_io_cq instead of io_context
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Now that io_cq is managed by block core and guaranteed to exist for
any in-flight request, it is easier and carries more information to
pass around cfq_io_cq than io_context.

This patch updates cfq_init_prio_data(), cfq_find_alloc_queue() and
cfq_get_queue() to take @cic instead of @IOC.  This change removes a
duplicate cfq_cic_lookup() from cfq_find_alloc_queue().

This change enables the use of cic-cached ioprio in the next patch.

Signed-off-by: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
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@htejun @axboe
htejun authored and axboe committed Mar 20, 2012
1 parent 9a9e8a2 commit abede6d
Showing 1 changed file with 17 additions and 22 deletions.
39 changes: 17 additions & 22 deletions block/cfq-iosched.c
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Original file line number Diff line number Diff line change
Expand Up @@ -468,7 +468,7 @@ static inline int cfqg_busy_async_queues(struct cfq_data *cfqd,

static void cfq_dispatch_insert(struct request_queue *, struct request *);
static struct cfq_queue *cfq_get_queue(struct cfq_data *cfqd, bool is_sync,
struct io_context *ioc, struct bio *bio,
struct cfq_io_cq *cic, struct bio *bio,
gfp_t gfp_mask);

static inline struct cfq_io_cq *icq_to_cic(struct io_cq *icq)
Expand Down Expand Up @@ -2560,15 +2560,15 @@ static void cfq_exit_icq(struct io_cq *icq)
}
}

static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc)
static void cfq_init_prio_data(struct cfq_queue *cfqq, struct cfq_io_cq *cic)
{
struct task_struct *tsk = current;
int ioprio_class;

if (!cfq_cfqq_prio_changed(cfqq))
return;

ioprio_class = IOPRIO_PRIO_CLASS(ioc->ioprio);
ioprio_class = IOPRIO_PRIO_CLASS(cic->icq.ioc->ioprio);
switch (ioprio_class) {
default:
printk(KERN_ERR "cfq: bad prio %x\n", ioprio_class);
Expand All @@ -2580,11 +2580,11 @@ static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc)
cfqq->ioprio_class = task_nice_ioclass(tsk);
break;
case IOPRIO_CLASS_RT:
cfqq->ioprio = task_ioprio(ioc);
cfqq->ioprio = task_ioprio(cic->icq.ioc);
cfqq->ioprio_class = IOPRIO_CLASS_RT;
break;
case IOPRIO_CLASS_BE:
cfqq->ioprio = task_ioprio(ioc);
cfqq->ioprio = task_ioprio(cic->icq.ioc);
cfqq->ioprio_class = IOPRIO_CLASS_BE;
break;
case IOPRIO_CLASS_IDLE:
Expand Down Expand Up @@ -2613,8 +2613,8 @@ static void changed_ioprio(struct cfq_io_cq *cic, struct bio *bio)
cfqq = cic->cfqq[BLK_RW_ASYNC];
if (cfqq) {
struct cfq_queue *new_cfqq;
new_cfqq = cfq_get_queue(cfqd, BLK_RW_ASYNC, cic->icq.ioc,
bio, GFP_ATOMIC);
new_cfqq = cfq_get_queue(cfqd, BLK_RW_ASYNC, cic, bio,
GFP_ATOMIC);
if (new_cfqq) {
cic->cfqq[BLK_RW_ASYNC] = new_cfqq;
cfq_put_queue(cfqq);
Expand Down Expand Up @@ -2671,23 +2671,18 @@ static void changed_cgroup(struct cfq_io_cq *cic)
#endif /* CONFIG_CFQ_GROUP_IOSCHED */

static struct cfq_queue *
cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync,
struct io_context *ioc, struct bio *bio, gfp_t gfp_mask)
cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic,
struct bio *bio, gfp_t gfp_mask)
{
struct blkio_cgroup *blkcg;
struct cfq_queue *cfqq, *new_cfqq = NULL;
struct cfq_io_cq *cic;
struct cfq_group *cfqg;

retry:
rcu_read_lock();

blkcg = bio_blkio_cgroup(bio);

cfqg = cfq_lookup_create_cfqg(cfqd, blkcg);

cic = cfq_cic_lookup(cfqd, ioc);
/* cic always exists here */
cfqq = cic_to_cfqq(cic, is_sync);

/*
Expand Down Expand Up @@ -2716,7 +2711,7 @@ cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync,

if (cfqq) {
cfq_init_cfqq(cfqd, cfqq, current->pid, is_sync);
cfq_init_prio_data(cfqq, ioc);
cfq_init_prio_data(cfqq, cic);
cfq_link_cfqq_cfqg(cfqq, cfqg);
cfq_log_cfqq(cfqd, cfqq, "alloced");
} else
Expand Down Expand Up @@ -2746,11 +2741,11 @@ cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio)
}

static struct cfq_queue *
cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc,
cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic,
struct bio *bio, gfp_t gfp_mask)
{
const int ioprio = task_ioprio(ioc);
const int ioprio_class = task_ioprio_class(ioc);
const int ioprio = task_ioprio(cic->icq.ioc);
const int ioprio_class = task_ioprio_class(cic->icq.ioc);
struct cfq_queue **async_cfqq = NULL;
struct cfq_queue *cfqq = NULL;

Expand All @@ -2760,7 +2755,7 @@ cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc,
}

if (!cfqq)
cfqq = cfq_find_alloc_queue(cfqd, is_sync, ioc, bio, gfp_mask);
cfqq = cfq_find_alloc_queue(cfqd, is_sync, cic, bio, gfp_mask);

/*
* pin the queue now that it's allocated, scheduler exit will prune it
Expand Down Expand Up @@ -3030,7 +3025,7 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq)
struct cfq_queue *cfqq = RQ_CFQQ(rq);

cfq_log_cfqq(cfqd, cfqq, "insert_request");
cfq_init_prio_data(cfqq, RQ_CIC(rq)->icq.ioc);
cfq_init_prio_data(cfqq, RQ_CIC(rq));

rq_set_fifo_time(rq, jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)]);
list_add_tail(&rq->queuelist, &cfqq->fifo);
Expand Down Expand Up @@ -3234,7 +3229,7 @@ static int cfq_may_queue(struct request_queue *q, int rw)

cfqq = cic_to_cfqq(cic, rw_is_sync(rw));
if (cfqq) {
cfq_init_prio_data(cfqq, cic->icq.ioc);
cfq_init_prio_data(cfqq, cic);

return __cfq_may_queue(cfqq);
}
Expand Down Expand Up @@ -3326,7 +3321,7 @@ cfq_set_request(struct request_queue *q, struct request *rq, struct bio *bio,
new_queue:
cfqq = cic_to_cfqq(cic, is_sync);
if (!cfqq || cfqq == &cfqd->oom_cfqq) {
cfqq = cfq_get_queue(cfqd, is_sync, cic->icq.ioc, bio, gfp_mask);
cfqq = cfq_get_queue(cfqd, is_sync, cic, bio, gfp_mask);
cic_set_cfqq(cic, cfqq, is_sync);
} else {
/*
Expand Down

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