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Message-ID: <20241202174606.4074512-7-vincent.guittot@linaro.org>
Date: Mon, 2 Dec 2024 18:46:01 +0100
From: Vincent Guittot <vincent.guittot@...aro.org>
To: mingo@...hat.com,
peterz@...radead.org,
juri.lelli@...hat.com,
dietmar.eggemann@....com,
rostedt@...dmis.org,
bsegall@...gle.com,
mgorman@...e.de,
vschneid@...hat.com,
linux-kernel@...r.kernel.org
Cc: kprateek.nayak@....com,
pauld@...hat.com,
efault@....de,
luis.machado@....com,
tj@...nel.org,
void@...ifault.com,
Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH 06/11 v3] sched/fair: Removed unsued cfs_rq.h_nr_delayed
h_nr_delayed is not used anymore. We now have
- h_nr_runnable which tracks tasks ready to run
- h_nr_queued which tracks enqueued tasks either ready to run or delayed
dequeue
Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
---
kernel/sched/debug.c | 1 -
kernel/sched/fair.c | 40 ++++++++++++----------------------------
kernel/sched/sched.h | 1 -
3 files changed, 12 insertions(+), 30 deletions(-)
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index fd711cc4d44c..56be3651605d 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -846,7 +846,6 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
SEQ_printf(m, " .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
SEQ_printf(m, " .%-30s: %d\n", "h_nr_runnable", cfs_rq->h_nr_runnable);
SEQ_printf(m, " .%-30s: %d\n", "h_nr_queued", cfs_rq->h_nr_queued);
- SEQ_printf(m, " .%-30s: %d\n", "h_nr_delayed", cfs_rq->h_nr_delayed);
SEQ_printf(m, " .%-30s: %d\n", "idle_nr_running",
cfs_rq->idle_nr_running);
SEQ_printf(m, " .%-30s: %d\n", "idle_h_nr_running",
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e3c89aeda73f..8afd1b548e76 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5470,7 +5470,6 @@ static void set_delayed(struct sched_entity *se)
struct cfs_rq *cfs_rq = cfs_rq_of(se);
cfs_rq->h_nr_runnable--;
- cfs_rq->h_nr_delayed++;
if (cfs_rq_throttled(cfs_rq))
break;
}
@@ -5483,7 +5482,6 @@ static void clear_delayed(struct sched_entity *se)
struct cfs_rq *cfs_rq = cfs_rq_of(se);
cfs_rq->h_nr_runnable++;
- cfs_rq->h_nr_delayed--;
if (cfs_rq_throttled(cfs_rq))
break;
}
@@ -5935,7 +5933,7 @@ static bool throttle_cfs_rq(struct cfs_rq *cfs_rq)
struct rq *rq = rq_of(cfs_rq);
struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
struct sched_entity *se;
- long queued_delta, runnable_delta, idle_task_delta, delayed_delta, dequeue = 1;
+ long queued_delta, runnable_delta, idle_task_delta, dequeue = 1;
long rq_h_nr_queued = rq->cfs.h_nr_queued;
raw_spin_lock(&cfs_b->lock);
@@ -5969,7 +5967,6 @@ static bool throttle_cfs_rq(struct cfs_rq *cfs_rq)
queued_delta = cfs_rq->h_nr_queued;
runnable_delta = cfs_rq->h_nr_runnable;
idle_task_delta = cfs_rq->idle_h_nr_running;
- delayed_delta = cfs_rq->h_nr_delayed;
for_each_sched_entity(se) {
struct cfs_rq *qcfs_rq = cfs_rq_of(se);
int flags;
@@ -5994,7 +5991,6 @@ static bool throttle_cfs_rq(struct cfs_rq *cfs_rq)
qcfs_rq->h_nr_queued -= queued_delta;
qcfs_rq->h_nr_runnable -= runnable_delta;
qcfs_rq->idle_h_nr_running -= idle_task_delta;
- qcfs_rq->h_nr_delayed -= delayed_delta;
if (qcfs_rq->load.weight) {
/* Avoid re-evaluating load for this entity: */
@@ -6018,7 +6014,6 @@ static bool throttle_cfs_rq(struct cfs_rq *cfs_rq)
qcfs_rq->h_nr_queued -= queued_delta;
qcfs_rq->h_nr_runnable -= runnable_delta;
qcfs_rq->idle_h_nr_running -= idle_task_delta;
- qcfs_rq->h_nr_delayed -= delayed_delta;
}
/* At this point se is NULL and we are at root level*/
@@ -6044,7 +6039,7 @@ void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
struct rq *rq = rq_of(cfs_rq);
struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
struct sched_entity *se;
- long queued_delta, runnable_delta, idle_task_delta, delayed_delta;
+ long queued_delta, runnable_delta, idle_task_delta;
long rq_h_nr_queued = rq->cfs.h_nr_queued;
se = cfs_rq->tg->se[cpu_of(rq)];
@@ -6081,7 +6076,6 @@ void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
queued_delta = cfs_rq->h_nr_queued;
runnable_delta = cfs_rq->h_nr_runnable;
idle_task_delta = cfs_rq->idle_h_nr_running;
- delayed_delta = cfs_rq->h_nr_delayed;
for_each_sched_entity(se) {
struct cfs_rq *qcfs_rq = cfs_rq_of(se);
@@ -6100,7 +6094,6 @@ void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
qcfs_rq->h_nr_queued += queued_delta;
qcfs_rq->h_nr_runnable += runnable_delta;
qcfs_rq->idle_h_nr_running += idle_task_delta;
- qcfs_rq->h_nr_delayed += delayed_delta;
/* end evaluation on encountering a throttled cfs_rq */
if (cfs_rq_throttled(qcfs_rq))
@@ -6119,7 +6112,6 @@ void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
qcfs_rq->h_nr_queued += queued_delta;
qcfs_rq->h_nr_runnable += runnable_delta;
qcfs_rq->idle_h_nr_running += idle_task_delta;
- qcfs_rq->h_nr_delayed += delayed_delta;
/* end evaluation on encountering a throttled cfs_rq */
if (cfs_rq_throttled(qcfs_rq))
@@ -6982,7 +6974,7 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
struct cfs_rq *cfs_rq;
struct sched_entity *se = &p->se;
int idle_h_nr_running = task_has_idle_policy(p);
- int h_nr_delayed = 0;
+ int h_nr_runnable = 1;
int task_new = !(flags & ENQUEUE_WAKEUP);
int rq_h_nr_queued = rq->cfs.h_nr_queued;
u64 slice = 0;
@@ -7009,8 +7001,8 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
if (p->in_iowait)
cpufreq_update_util(rq, SCHED_CPUFREQ_IOWAIT);
- if (task_new)
- h_nr_delayed = !!se->sched_delayed;
+ if (task_new && se->sched_delayed)
+ h_nr_runnable = 0;
for_each_sched_entity(se) {
if (se->on_rq) {
@@ -7032,11 +7024,9 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
enqueue_entity(cfs_rq, se, flags);
slice = cfs_rq_min_slice(cfs_rq);
- if (!h_nr_delayed)
- cfs_rq->h_nr_runnable++;
+ cfs_rq->h_nr_runnable += h_nr_runnable;
cfs_rq->h_nr_queued++;
cfs_rq->idle_h_nr_running += idle_h_nr_running;
- cfs_rq->h_nr_delayed += h_nr_delayed;
if (cfs_rq_is_idle(cfs_rq))
idle_h_nr_running = 1;
@@ -7058,11 +7048,9 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
se->slice = slice;
slice = cfs_rq_min_slice(cfs_rq);
- if (!h_nr_delayed)
- cfs_rq->h_nr_runnable++;
+ cfs_rq->h_nr_runnable += h_nr_runnable;
cfs_rq->h_nr_queued++;
cfs_rq->idle_h_nr_running += idle_h_nr_running;
- cfs_rq->h_nr_delayed += h_nr_delayed;
if (cfs_rq_is_idle(cfs_rq))
idle_h_nr_running = 1;
@@ -7125,7 +7113,7 @@ static int dequeue_entities(struct rq *rq, struct sched_entity *se, int flags)
struct task_struct *p = NULL;
int idle_h_nr_running = 0;
int h_nr_queued = 0;
- int h_nr_delayed = 0;
+ int h_nr_runnable = 0;
struct cfs_rq *cfs_rq;
u64 slice = 0;
@@ -7133,8 +7121,8 @@ static int dequeue_entities(struct rq *rq, struct sched_entity *se, int flags)
p = task_of(se);
h_nr_queued = 1;
idle_h_nr_running = task_has_idle_policy(p);
- if (!task_sleep && !task_delayed)
- h_nr_delayed = !!se->sched_delayed;
+ if (task_sleep || task_delayed || !se->sched_delayed)
+ h_nr_runnable = 1;
} else {
cfs_rq = group_cfs_rq(se);
slice = cfs_rq_min_slice(cfs_rq);
@@ -7150,11 +7138,9 @@ static int dequeue_entities(struct rq *rq, struct sched_entity *se, int flags)
break;
}
- if (!h_nr_delayed)
- cfs_rq->h_nr_runnable -= h_nr_queued;
+ cfs_rq->h_nr_runnable -= h_nr_runnable;
cfs_rq->h_nr_queued -= h_nr_queued;
cfs_rq->idle_h_nr_running -= idle_h_nr_running;
- cfs_rq->h_nr_delayed -= h_nr_delayed;
if (cfs_rq_is_idle(cfs_rq))
idle_h_nr_running = h_nr_queued;
@@ -7191,11 +7177,9 @@ static int dequeue_entities(struct rq *rq, struct sched_entity *se, int flags)
se->slice = slice;
slice = cfs_rq_min_slice(cfs_rq);
- if (!h_nr_delayed)
- cfs_rq->h_nr_runnable -= h_nr_queued;
+ cfs_rq->h_nr_runnable -= h_nr_runnable;
cfs_rq->h_nr_queued -= h_nr_queued;
cfs_rq->idle_h_nr_running -= idle_h_nr_running;
- cfs_rq->h_nr_delayed -= h_nr_delayed;
if (cfs_rq_is_idle(cfs_rq))
idle_h_nr_running = h_nr_queued;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 4374c660f5c7..d3ce5e99b025 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -650,7 +650,6 @@ struct cfs_rq {
unsigned int h_nr_runnable; /* SCHED_{NORMAL,BATCH,IDLE} */
unsigned int idle_nr_running; /* SCHED_IDLE */
unsigned int idle_h_nr_running; /* SCHED_IDLE */
- unsigned int h_nr_delayed;
s64 avg_vruntime;
u64 avg_load;
--
2.43.0
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