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Message-Id: <1356726946-26037-3-git-send-email-tj@kernel.org>
Date: Fri, 28 Dec 2012 12:35:24 -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 02/24] cfq-iosched: More renaming to better represent wl_class and wl_type
From: Vivek Goyal <vgoyal@...hat.com>
Some more renaming. Again making the code uniform w.r.t use of
wl_class/class to represent IO class (RT, BE, IDLE) and using
wl_type/type to represent subclass (SYNC, SYNC-IDLE, ASYNC).
At places this patch shortens the string "workload" to "wl".
Renamed "saved_workload" to "saved_wl_type". Renamed
"saved_serving_class" to "saved_wl_class".
For uniformity with "saved_wl_*" variables, renamed "serving_class"
to "serving_wl_class" and renamed "serving_type" to "serving_wl_type".
Again, just trying to improve upon code uniformity and improve
readability. No functional change.
v2:
- Restored the usage of keyword "service" 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 | 64 +++++++++++++++++++++++++++--------------------------
1 file changed, 33 insertions(+), 31 deletions(-)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 7646dfd..8f890bf 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -248,9 +248,9 @@ struct cfq_group {
struct cfq_rb_root service_trees[2][3];
struct cfq_rb_root service_tree_idle;
- unsigned long saved_workload_slice;
- enum wl_type_t saved_workload;
- enum wl_class_t saved_serving_class;
+ unsigned long saved_wl_slice;
+ enum wl_type_t saved_wl_type;
+ enum wl_class_t saved_wl_class;
/* number of requests that are on the dispatch list or inside driver */
int dispatched;
@@ -280,8 +280,8 @@ struct cfq_data {
/*
* The priority currently being served
*/
- enum wl_class_t serving_class;
- enum wl_type_t serving_type;
+ enum wl_class_t serving_wl_class;
+ enum wl_type_t serving_wl_type;
unsigned long workload_expires;
struct cfq_group *serving_group;
@@ -1241,7 +1241,7 @@ cfq_group_notify_queue_del(struct cfq_data *cfqd, struct cfq_group *cfqg)
cfq_log_cfqg(cfqd, cfqg, "del_from_rr group");
cfq_group_service_tree_del(st, cfqg);
- cfqg->saved_workload_slice = 0;
+ cfqg->saved_wl_slice = 0;
cfqg_stats_update_dequeue(cfqg);
}
@@ -1301,12 +1301,12 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg,
/* This group is being expired. Save the context */
if (time_after(cfqd->workload_expires, jiffies)) {
- cfqg->saved_workload_slice = cfqd->workload_expires
+ cfqg->saved_wl_slice = cfqd->workload_expires
- jiffies;
- cfqg->saved_workload = cfqd->serving_type;
- cfqg->saved_serving_class = cfqd->serving_class;
+ cfqg->saved_wl_type = cfqd->serving_wl_type;
+ cfqg->saved_wl_class = cfqd->serving_wl_class;
} else
- cfqg->saved_workload_slice = 0;
+ cfqg->saved_wl_slice = 0;
cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime,
st->min_vdisktime);
@@ -2031,7 +2031,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd,
{
if (cfqq) {
cfq_log_cfqq(cfqd, cfqq, "set_active wl_class:%d wl_type:%d",
- cfqd->serving_class, cfqd->serving_type);
+ cfqd->serving_wl_class, cfqd->serving_wl_type);
cfqg_stats_update_avg_queue_size(cfqq->cfqg);
cfqq->slice_start = 0;
cfqq->dispatch_start = jiffies;
@@ -2118,8 +2118,8 @@ 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_class,
- cfqd->serving_type);
+ service_tree_for(cfqd->serving_group, cfqd->serving_wl_class,
+ cfqd->serving_wl_type);
if (!cfqd->rq_queued)
return NULL;
@@ -2523,20 +2523,20 @@ static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg)
unsigned count;
struct cfq_rb_root *st;
unsigned group_slice;
- enum wl_class_t original_class = cfqd->serving_class;
+ enum wl_class_t original_class = cfqd->serving_wl_class;
/* Choose next priority. RT > BE > IDLE */
if (cfq_group_busy_queues_wl(RT_WORKLOAD, cfqd, cfqg))
- cfqd->serving_class = RT_WORKLOAD;
+ cfqd->serving_wl_class = RT_WORKLOAD;
else if (cfq_group_busy_queues_wl(BE_WORKLOAD, cfqd, cfqg))
- cfqd->serving_class = BE_WORKLOAD;
+ cfqd->serving_wl_class = BE_WORKLOAD;
else {
- cfqd->serving_class = IDLE_WORKLOAD;
+ cfqd->serving_wl_class = IDLE_WORKLOAD;
cfqd->workload_expires = jiffies + 1;
return;
}
- if (original_class != cfqd->serving_class)
+ if (original_class != cfqd->serving_wl_class)
goto new_workload;
/*
@@ -2544,7 +2544,8 @@ 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_class, cfqd->serving_type);
+ st = service_tree_for(cfqg, cfqd->serving_wl_class,
+ cfqd->serving_wl_type);
count = st->count;
/*
@@ -2555,9 +2556,10 @@ static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg)
new_workload:
/* otherwise select new workload type */
- cfqd->serving_type =
- cfq_choose_wl(cfqd, cfqg, cfqd->serving_class);
- st = service_tree_for(cfqg, cfqd->serving_class, cfqd->serving_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);
count = st->count;
/*
@@ -2568,11 +2570,11 @@ new_workload:
group_slice = cfq_group_slice(cfqd, cfqg);
slice = group_slice * count /
- max_t(unsigned, cfqg->busy_queues_avg[cfqd->serving_class],
- cfq_group_busy_queues_wl(cfqd->serving_class, cfqd,
+ max_t(unsigned, cfqg->busy_queues_avg[cfqd->serving_wl_class],
+ cfq_group_busy_queues_wl(cfqd->serving_wl_class, cfqd,
cfqg));
- if (cfqd->serving_type == ASYNC_WORKLOAD) {
+ if (cfqd->serving_wl_type == ASYNC_WORKLOAD) {
unsigned int tmp;
/*
@@ -2618,10 +2620,10 @@ static void cfq_choose_cfqg(struct cfq_data *cfqd)
cfqd->serving_group = cfqg;
/* Restore the workload type data */
- if (cfqg->saved_workload_slice) {
- cfqd->workload_expires = jiffies + cfqg->saved_workload_slice;
- cfqd->serving_type = cfqg->saved_workload;
- cfqd->serving_class = cfqg->saved_serving_class;
+ if (cfqg->saved_wl_slice) {
+ cfqd->workload_expires = jiffies + cfqg->saved_wl_slice;
+ cfqd->serving_wl_type = cfqg->saved_wl_type;
+ cfqd->serving_wl_class = cfqg->saved_wl_class;
} else
cfqd->workload_expires = jiffies - 1;
@@ -3404,7 +3406,7 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
return true;
/* Allow preemption only if we are idling on sync-noidle tree */
- if (cfqd->serving_type == SYNC_NOIDLE_WORKLOAD &&
+ if (cfqd->serving_wl_type == SYNC_NOIDLE_WORKLOAD &&
cfqq_type(new_cfqq) == SYNC_NOIDLE_WORKLOAD &&
new_cfqq->service_tree->count == 2 &&
RB_EMPTY_ROOT(&cfqq->sort_list))
@@ -3456,7 +3458,7 @@ static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq)
* doesn't happen
*/
if (old_type != cfqq_type(cfqq))
- cfqq->cfqg->saved_workload_slice = 0;
+ cfqq->cfqg->saved_wl_slice = 0;
/*
* Put the new queue at the front of the of the current list,
--
1.8.0.2
--
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