aboutsummaryrefslogtreecommitdiff
path: root/block/as-iosched.c
diff options
context:
space:
mode:
Diffstat (limited to 'block/as-iosched.c')
-rw-r--r--block/as-iosched.c116
1 files changed, 57 insertions, 59 deletions
diff --git a/block/as-iosched.c b/block/as-iosched.c
index 631f6f44460..c48fa670d22 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -17,9 +17,6 @@
#include <linux/rbtree.h>
#include <linux/interrupt.h>
-#define REQ_SYNC 1
-#define REQ_ASYNC 0
-
/*
* See Documentation/block/as-iosched.txt
*/
@@ -93,7 +90,7 @@ struct as_data {
struct list_head fifo_list[2];
struct request *next_rq[2]; /* next in sort order */
- sector_t last_sector[2]; /* last REQ_SYNC & REQ_ASYNC sectors */
+ sector_t last_sector[2]; /* last SYNC & ASYNC sectors */
unsigned long exit_prob; /* probability a task will exit while
being waited on */
@@ -109,7 +106,7 @@ struct as_data {
unsigned long last_check_fifo[2];
int changed_batch; /* 1: waiting for old batch to end */
int new_batch; /* 1: waiting on first read complete */
- int batch_data_dir; /* current batch REQ_SYNC / REQ_ASYNC */
+ int batch_data_dir; /* current batch SYNC / ASYNC */
int write_batch_count; /* max # of reqs in a write batch */
int current_write_count; /* how many requests left this batch */
int write_batch_idled; /* has the write batch gone idle? */
@@ -554,7 +551,7 @@ static void as_update_iohist(struct as_data *ad, struct as_io_context *aic,
if (aic == NULL)
return;
- if (data_dir == REQ_SYNC) {
+ if (data_dir == BLK_RW_SYNC) {
unsigned long in_flight = atomic_read(&aic->nr_queued)
+ atomic_read(&aic->nr_dispatched);
spin_lock(&aic->lock);
@@ -811,7 +808,7 @@ static void as_update_rq(struct as_data *ad, struct request *rq)
*/
static void update_write_batch(struct as_data *ad)
{
- unsigned long batch = ad->batch_expire[REQ_ASYNC];
+ unsigned long batch = ad->batch_expire[BLK_RW_ASYNC];
long write_time;
write_time = (jiffies - ad->current_batch_expires) + batch;
@@ -855,7 +852,7 @@ static void as_completed_request(struct request_queue *q, struct request *rq)
kblockd_schedule_work(q, &ad->antic_work);
ad->changed_batch = 0;
- if (ad->batch_data_dir == REQ_SYNC)
+ if (ad->batch_data_dir == BLK_RW_SYNC)
ad->new_batch = 1;
}
WARN_ON(ad->nr_dispatched == 0);
@@ -869,7 +866,7 @@ static void as_completed_request(struct request_queue *q, struct request *rq)
if (ad->new_batch && ad->batch_data_dir == rq_is_sync(rq)) {
update_write_batch(ad);
ad->current_batch_expires = jiffies +
- ad->batch_expire[REQ_SYNC];
+ ad->batch_expire[BLK_RW_SYNC];
ad->new_batch = 0;
}
@@ -960,7 +957,7 @@ static inline int as_batch_expired(struct as_data *ad)
if (ad->changed_batch || ad->new_batch)
return 0;
- if (ad->batch_data_dir == REQ_SYNC)
+ if (ad->batch_data_dir == BLK_RW_SYNC)
/* TODO! add a check so a complete fifo gets written? */
return time_after(jiffies, ad->current_batch_expires);
@@ -986,7 +983,7 @@ static void as_move_to_dispatch(struct as_data *ad, struct request *rq)
*/
ad->last_sector[data_dir] = rq->sector + rq->nr_sectors;
- if (data_dir == REQ_SYNC) {
+ if (data_dir == BLK_RW_SYNC) {
struct io_context *ioc = RQ_IOC(rq);
/* In case we have to anticipate after this */
copy_io_context(&ad->io_context, &ioc);
@@ -1025,41 +1022,41 @@ static void as_move_to_dispatch(struct as_data *ad, struct request *rq)
static int as_dispatch_request(struct request_queue *q, int force)
{
struct as_data *ad = q->elevator->elevator_data;
- const int reads = !list_empty(&ad->fifo_list[REQ_SYNC]);
- const int writes = !list_empty(&ad->fifo_list[REQ_ASYNC]);
+ const int reads = !list_empty(&ad->fifo_list[BLK_RW_SYNC]);
+ const int writes = !list_empty(&ad->fifo_list[BLK_RW_ASYNC]);
struct request *rq;
if (unlikely(force)) {
/*
* Forced dispatch, accounting is useless. Reset
* accounting states and dump fifo_lists. Note that
- * batch_data_dir is reset to REQ_SYNC to avoid
+ * batch_data_dir is reset to BLK_RW_SYNC to avoid
* screwing write batch accounting as write batch
* accounting occurs on W->R transition.
*/
int dispatched = 0;
- ad->batch_data_dir = REQ_SYNC;
+ ad->batch_data_dir = BLK_RW_SYNC;
ad->changed_batch = 0;
ad->new_batch = 0;
- while (ad->next_rq[REQ_SYNC]) {
- as_move_to_dispatch(ad, ad->next_rq[REQ_SYNC]);
+ while (ad->next_rq[BLK_RW_SYNC]) {
+ as_move_to_dispatch(ad, ad->next_rq[BLK_RW_SYNC]);
dispatched++;
}
- ad->last_check_fifo[REQ_SYNC] = jiffies;
+ ad->last_check_fifo[BLK_RW_SYNC] = jiffies;
- while (ad->next_rq[REQ_ASYNC]) {
- as_move_to_dispatch(ad, ad->next_rq[REQ_ASYNC]);
+ while (ad->next_rq[BLK_RW_ASYNC]) {
+ as_move_to_dispatch(ad, ad->next_rq[BLK_RW_ASYNC]);
dispatched++;
}
- ad->last_check_fifo[REQ_ASYNC] = jiffies;
+ ad->last_check_fifo[BLK_RW_ASYNC] = jiffies;
return dispatched;
}
/* Signal that the write batch was uncontended, so we can't time it */
- if (ad->batch_data_dir == REQ_ASYNC && !reads) {
+ if (ad->batch_data_dir == BLK_RW_ASYNC && !reads) {
if (ad->current_write_count == 0 || !writes)
ad->write_batch_idled = 1;
}
@@ -1076,8 +1073,8 @@ static int as_dispatch_request(struct request_queue *q, int force)
*/
rq = ad->next_rq[ad->batch_data_dir];
- if (ad->batch_data_dir == REQ_SYNC && ad->antic_expire) {
- if (as_fifo_expired(ad, REQ_SYNC))
+ if (ad->batch_data_dir == BLK_RW_SYNC && ad->antic_expire) {
+ if (as_fifo_expired(ad, BLK_RW_SYNC))
goto fifo_expired;
if (as_can_anticipate(ad, rq)) {
@@ -1090,7 +1087,7 @@ static int as_dispatch_request(struct request_queue *q, int force)
/* we have a "next request" */
if (reads && !writes)
ad->current_batch_expires =
- jiffies + ad->batch_expire[REQ_SYNC];
+ jiffies + ad->batch_expire[BLK_RW_SYNC];
goto dispatch_request;
}
}
@@ -1101,20 +1098,20 @@ static int as_dispatch_request(struct request_queue *q, int force)
*/
if (reads) {
- BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[REQ_SYNC]));
+ BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[BLK_RW_SYNC]));
- if (writes && ad->batch_data_dir == REQ_SYNC)
+ if (writes && ad->batch_data_dir == BLK_RW_SYNC)
/*
* Last batch was a read, switch to writes
*/
goto dispatch_writes;
- if (ad->batch_data_dir == REQ_ASYNC) {
+ if (ad->batch_data_dir == BLK_RW_ASYNC) {
WARN_ON(ad->new_batch);
ad->changed_batch = 1;
}
- ad->batch_data_dir = REQ_SYNC;
- rq = rq_entry_fifo(ad->fifo_list[REQ_SYNC].next);
+ ad->batch_data_dir = BLK_RW_SYNC;
+ rq = rq_entry_fifo(ad->fifo_list[BLK_RW_SYNC].next);
ad->last_check_fifo[ad->batch_data_dir] = jiffies;
goto dispatch_request;
}
@@ -1125,9 +1122,9 @@ static int as_dispatch_request(struct request_queue *q, int force)
if (writes) {
dispatch_writes:
- BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[REQ_ASYNC]));
+ BUG_ON(RB_EMPTY_ROOT(&ad->sort_list[BLK_RW_ASYNC]));
- if (ad->batch_data_dir == REQ_SYNC) {
+ if (ad->batch_data_dir == BLK_RW_SYNC) {
ad->changed_batch = 1;
/*
@@ -1137,11 +1134,11 @@ dispatch_writes:
*/
ad->new_batch = 0;
}
- ad->batch_data_dir = REQ_ASYNC;
+ ad->batch_data_dir = BLK_RW_ASYNC;
ad->current_write_count = ad->write_batch_count;
ad->write_batch_idled = 0;
- rq = rq_entry_fifo(ad->fifo_list[REQ_ASYNC].next);
- ad->last_check_fifo[REQ_ASYNC] = jiffies;
+ rq = rq_entry_fifo(ad->fifo_list[BLK_RW_ASYNC].next);
+ ad->last_check_fifo[BLK_RW_ASYNC] = jiffies;
goto dispatch_request;
}
@@ -1164,9 +1161,9 @@ fifo_expired:
if (ad->nr_dispatched)
return 0;
- if (ad->batch_data_dir == REQ_ASYNC)
+ if (ad->batch_data_dir == BLK_RW_ASYNC)
ad->current_batch_expires = jiffies +
- ad->batch_expire[REQ_ASYNC];
+ ad->batch_expire[BLK_RW_ASYNC];
else
ad->new_batch = 1;
@@ -1238,8 +1235,8 @@ static int as_queue_empty(struct request_queue *q)
{
struct as_data *ad = q->elevator->elevator_data;
- return list_empty(&ad->fifo_list[REQ_ASYNC])
- && list_empty(&ad->fifo_list[REQ_SYNC]);
+ return list_empty(&ad->fifo_list[BLK_RW_ASYNC])
+ && list_empty(&ad->fifo_list[BLK_RW_SYNC]);
}
static int
@@ -1346,8 +1343,8 @@ static void as_exit_queue(struct elevator_queue *e)
del_timer_sync(&ad->antic_timer);
cancel_work_sync(&ad->antic_work);
- BUG_ON(!list_empty(&ad->fifo_list[REQ_SYNC]));
- BUG_ON(!list_empty(&ad->fifo_list[REQ_ASYNC]));
+ BUG_ON(!list_empty(&ad->fifo_list[BLK_RW_SYNC]));
+ BUG_ON(!list_empty(&ad->fifo_list[BLK_RW_ASYNC]));
put_io_context(ad->io_context);
kfree(ad);
@@ -1372,18 +1369,18 @@ static void *as_init_queue(struct request_queue *q)
init_timer(&ad->antic_timer);
INIT_WORK(&ad->antic_work, as_work_handler);
- INIT_LIST_HEAD(&ad->fifo_list[REQ_SYNC]);
- INIT_LIST_HEAD(&ad->fifo_list[REQ_ASYNC]);
- ad->sort_list[REQ_SYNC] = RB_ROOT;
- ad->sort_list[REQ_ASYNC] = RB_ROOT;
- ad->fifo_expire[REQ_SYNC] = default_read_expire;
- ad->fifo_expire[REQ_ASYNC] = default_write_expire;
+ INIT_LIST_HEAD(&ad->fifo_list[BLK_RW_SYNC]);
+ INIT_LIST_HEAD(&ad->fifo_list[BLK_RW_ASYNC]);
+ ad->sort_list[BLK_RW_SYNC] = RB_ROOT;
+ ad->sort_list[BLK_RW_ASYNC] = RB_ROOT;
+ ad->fifo_expire[BLK_RW_SYNC] = default_read_expire;
+ ad->fifo_expire[BLK_RW_ASYNC] = default_write_expire;
ad->antic_expire = default_antic_expire;
- ad->batch_expire[REQ_SYNC] = default_read_batch_expire;
- ad->batch_expire[REQ_ASYNC] = default_write_batch_expire;
+ ad->batch_expire[BLK_RW_SYNC] = default_read_batch_expire;
+ ad->batch_expire[BLK_RW_ASYNC] = default_write_batch_expire;
- ad->current_batch_expires = jiffies + ad->batch_expire[REQ_SYNC];
- ad->write_batch_count = ad->batch_expire[REQ_ASYNC] / 10;
+ ad->current_batch_expires = jiffies + ad->batch_expire[BLK_RW_SYNC];
+ ad->write_batch_count = ad->batch_expire[BLK_RW_ASYNC] / 10;
if (ad->write_batch_count < 2)
ad->write_batch_count = 2;
@@ -1432,11 +1429,11 @@ static ssize_t __FUNC(struct elevator_queue *e, char *page) \
struct as_data *ad = e->elevator_data; \
return as_var_show(jiffies_to_msecs((__VAR)), (page)); \
}
-SHOW_FUNCTION(as_read_expire_show, ad->fifo_expire[REQ_SYNC]);
-SHOW_FUNCTION(as_write_expire_show, ad->fifo_expire[REQ_ASYNC]);
+SHOW_FUNCTION(as_read_expire_show, ad->fifo_expire[BLK_RW_SYNC]);
+SHOW_FUNCTION(as_write_expire_show, ad->fifo_expire[BLK_RW_ASYNC]);
SHOW_FUNCTION(as_antic_expire_show, ad->antic_expire);
-SHOW_FUNCTION(as_read_batch_expire_show, ad->batch_expire[REQ_SYNC]);
-SHOW_FUNCTION(as_write_batch_expire_show, ad->batch_expire[REQ_ASYNC]);
+SHOW_FUNCTION(as_read_batch_expire_show, ad->batch_expire[BLK_RW_SYNC]);
+SHOW_FUNCTION(as_write_batch_expire_show, ad->batch_expire[BLK_RW_ASYNC]);
#undef SHOW_FUNCTION
#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX) \
@@ -1451,13 +1448,14 @@ static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count)
*(__PTR) = msecs_to_jiffies(*(__PTR)); \
return ret; \
}
-STORE_FUNCTION(as_read_expire_store, &ad->fifo_expire[REQ_SYNC], 0, INT_MAX);
-STORE_FUNCTION(as_write_expire_store, &ad->fifo_expire[REQ_ASYNC], 0, INT_MAX);
+STORE_FUNCTION(as_read_expire_store, &ad->fifo_expire[BLK_RW_SYNC], 0, INT_MAX);
+STORE_FUNCTION(as_write_expire_store,
+ &ad->fifo_expire[BLK_RW_ASYNC], 0, INT_MAX);
STORE_FUNCTION(as_antic_expire_store, &ad->antic_expire, 0, INT_MAX);
STORE_FUNCTION(as_read_batch_expire_store,
- &ad->batch_expire[REQ_SYNC], 0, INT_MAX);
+ &ad->batch_expire[BLK_RW_SYNC], 0, INT_MAX);
STORE_FUNCTION(as_write_batch_expire_store,
- &ad->batch_expire[REQ_ASYNC], 0, INT_MAX);
+ &ad->batch_expire[BLK_RW_ASYNC], 0, INT_MAX);
#undef STORE_FUNCTION
#define AS_ATTR(name) \