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Date: Fri, 28 Dec 2012 12:35:25 -0800
From: Tejun Heo <tj@...nel.org>
To: lizefan@...wei.com, axboe@...nel.dk, vgoyal@...hat.com
Cc: containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, ctalbott@...gle.com, rni@...gle.com,
Tejun Heo <tj@...nel.org>
Subject: [PATCH 03/24] cfq-iosched: Rename "service_tree" to "st" at some places
From: Vivek Goyal <vgoyal@...hat.com>
At quite a few places we use the keyword "service_tree". At some places,
especially local variables, I have abbreviated it to "st".
Also at couple of places moved binary operator "+" from beginning of line
to end of previous line, as per Tejun's feedback.
v2:
Reverted most of the service tree name change based on Jeff Moyer's feedback.
Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
---
block/cfq-iosched.c | 77 +++++++++++++++++++++++++----------------------------
1 file changed, 36 insertions(+), 41 deletions(-)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 8f890bf..db4a1a5 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -353,7 +353,7 @@ struct cfq_data {
static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd);
-static struct cfq_rb_root *service_tree_for(struct cfq_group *cfqg,
+static struct cfq_rb_root *st_for(struct cfq_group *cfqg,
enum wl_class_t class,
enum wl_type_t type)
{
@@ -758,16 +758,16 @@ static inline int cfq_group_busy_queues_wl(enum wl_class_t wl_class,
if (wl_class == IDLE_WORKLOAD)
return cfqg->service_tree_idle.count;
- return cfqg->service_trees[wl_class][ASYNC_WORKLOAD].count
- + cfqg->service_trees[wl_class][SYNC_NOIDLE_WORKLOAD].count
- + cfqg->service_trees[wl_class][SYNC_WORKLOAD].count;
+ return cfqg->service_trees[wl_class][ASYNC_WORKLOAD].count +
+ cfqg->service_trees[wl_class][SYNC_NOIDLE_WORKLOAD].count +
+ cfqg->service_trees[wl_class][SYNC_WORKLOAD].count;
}
static inline int cfqg_busy_async_queues(struct cfq_data *cfqd,
struct cfq_group *cfqg)
{
- return cfqg->service_trees[RT_WORKLOAD][ASYNC_WORKLOAD].count
- + cfqg->service_trees[BE_WORKLOAD][ASYNC_WORKLOAD].count;
+ return cfqg->service_trees[RT_WORKLOAD][ASYNC_WORKLOAD].count +
+ cfqg->service_trees[BE_WORKLOAD][ASYNC_WORKLOAD].count;
}
static void cfq_dispatch_insert(struct request_queue *, struct request *);
@@ -1612,15 +1612,14 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
struct rb_node **p, *parent;
struct cfq_queue *__cfqq;
unsigned long rb_key;
- struct cfq_rb_root *service_tree;
+ struct cfq_rb_root *st;
int left;
int new_cfqq = 1;
- service_tree = service_tree_for(cfqq->cfqg, cfqq_class(cfqq),
- cfqq_type(cfqq));
+ st = st_for(cfqq->cfqg, cfqq_class(cfqq), cfqq_type(cfqq));
if (cfq_class_idle(cfqq)) {
rb_key = CFQ_IDLE_DELAY;
- parent = rb_last(&service_tree->rb);
+ parent = rb_last(&st->rb);
if (parent && parent != &cfqq->rb_node) {
__cfqq = rb_entry(parent, struct cfq_queue, rb_node);
rb_key += __cfqq->rb_key;
@@ -1638,7 +1637,7 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
cfqq->slice_resid = 0;
} else {
rb_key = -HZ;
- __cfqq = cfq_rb_first(service_tree);
+ __cfqq = cfq_rb_first(st);
rb_key += __cfqq ? __cfqq->rb_key : jiffies;
}
@@ -1647,8 +1646,7 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
/*
* same position, nothing more to do
*/
- if (rb_key == cfqq->rb_key &&
- cfqq->service_tree == service_tree)
+ if (rb_key == cfqq->rb_key && cfqq->service_tree == st)
return;
cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree);
@@ -1657,8 +1655,8 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
left = 1;
parent = NULL;
- cfqq->service_tree = service_tree;
- p = &service_tree->rb.rb_node;
+ cfqq->service_tree = st;
+ p = &st->rb.rb_node;
while (*p) {
struct rb_node **n;
@@ -1679,12 +1677,12 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,
}
if (left)
- service_tree->left = &cfqq->rb_node;
+ st->left = &cfqq->rb_node;
cfqq->rb_key = rb_key;
rb_link_node(&cfqq->rb_node, parent, p);
- rb_insert_color(&cfqq->rb_node, &service_tree->rb);
- service_tree->count++;
+ rb_insert_color(&cfqq->rb_node, &st->rb);
+ st->count++;
if (add_front || !new_cfqq)
return;
cfq_group_notify_queue_add(cfqd, cfqq->cfqg);
@@ -2117,19 +2115,18 @@ static inline void cfq_slice_expired(struct cfq_data *cfqd, bool timed_out)
*/
static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd)
{
- struct cfq_rb_root *service_tree =
- service_tree_for(cfqd->serving_group, cfqd->serving_wl_class,
- cfqd->serving_wl_type);
+ struct cfq_rb_root *st = st_for(cfqd->serving_group,
+ cfqd->serving_wl_class, cfqd->serving_wl_type);
if (!cfqd->rq_queued)
return NULL;
/* There is nothing to dispatch */
- if (!service_tree)
+ if (!st)
return NULL;
- if (RB_EMPTY_ROOT(&service_tree->rb))
+ if (RB_EMPTY_ROOT(&st->rb))
return NULL;
- return cfq_rb_first(service_tree);
+ return cfq_rb_first(st);
}
static struct cfq_queue *cfq_get_next_queue_forced(struct cfq_data *cfqd)
@@ -2286,10 +2283,10 @@ static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd,
static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq)
{
enum wl_class_t wl_class = cfqq_class(cfqq);
- struct cfq_rb_root *service_tree = cfqq->service_tree;
+ struct cfq_rb_root *st = cfqq->service_tree;
- BUG_ON(!service_tree);
- BUG_ON(!service_tree->count);
+ BUG_ON(!st);
+ BUG_ON(!st->count);
if (!cfqd->cfq_slice_idle)
return false;
@@ -2307,11 +2304,10 @@ static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq)
* Otherwise, we do only if they are the last ones
* in their service tree.
*/
- if (service_tree->count == 1 && cfq_cfqq_sync(cfqq) &&
- !cfq_io_thinktime_big(cfqd, &service_tree->ttime, false))
+ if (st->count == 1 && cfq_cfqq_sync(cfqq) &&
+ !cfq_io_thinktime_big(cfqd, &st->ttime, false))
return true;
- cfq_log_cfqq(cfqd, cfqq, "Not idling. st->count:%d",
- service_tree->count);
+ cfq_log_cfqq(cfqd, cfqq, "Not idling. st->count:%d", st->count);
return false;
}
@@ -2505,7 +2501,7 @@ static enum wl_type_t cfq_choose_wl(struct cfq_data *cfqd,
for (i = 0; i <= SYNC_WORKLOAD; ++i) {
/* select the one with lowest rb_key */
- queue = cfq_rb_first(service_tree_for(cfqg, wl_class, i));
+ queue = cfq_rb_first(st_for(cfqg, wl_class, i));
if (queue &&
(!key_valid || time_before(queue->rb_key, lowest_key))) {
lowest_key = queue->rb_key;
@@ -2544,8 +2540,7 @@ static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg)
* (SYNC, SYNC_NOIDLE, ASYNC), and to compute a workload
* expiration time
*/
- st = service_tree_for(cfqg, cfqd->serving_wl_class,
- cfqd->serving_wl_type);
+ st = st_for(cfqg, cfqd->serving_wl_class, cfqd->serving_wl_type);
count = st->count;
/*
@@ -2558,8 +2553,7 @@ new_workload:
/* otherwise select new workload type */
cfqd->serving_wl_type = cfq_choose_wl(cfqd, cfqg,
cfqd->serving_wl_class);
- st = service_tree_for(cfqg, cfqd->serving_wl_class,
- cfqd->serving_wl_type);
+ st = st_for(cfqg, cfqd->serving_wl_class, cfqd->serving_wl_type);
count = st->count;
/*
@@ -3640,16 +3634,17 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--;
if (sync) {
- struct cfq_rb_root *service_tree;
+ struct cfq_rb_root *st;
RQ_CIC(rq)->ttime.last_end_request = now;
if (cfq_cfqq_on_rr(cfqq))
- service_tree = cfqq->service_tree;
+ st = cfqq->service_tree;
else
- service_tree = service_tree_for(cfqq->cfqg,
- cfqq_class(cfqq), cfqq_type(cfqq));
- service_tree->ttime.last_end_request = now;
+ st = st_for(cfqq->cfqg, cfqq_class(cfqq),
+ cfqq_type(cfqq));
+
+ st->ttime.last_end_request = now;
if (!time_after(rq->start_time + cfqd->cfq_fifo_expire[1], now))
cfqd->last_delayed_sync = now;
}
--
1.8.0.2
--
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