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Message-ID: <20230711011412.100319-10-tj@kernel.org>
Date: Mon, 10 Jul 2023 15:13:27 -1000
From: Tejun Heo <tj@...nel.org>
To: torvalds@...ux-foundation.org, mingo@...hat.com,
peterz@...radead.org, juri.lelli@...hat.com,
vincent.guittot@...aro.org, dietmar.eggemann@....com,
rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
bristot@...hat.com, vschneid@...hat.com, ast@...nel.org,
daniel@...earbox.net, andrii@...nel.org, martin.lau@...nel.org,
joshdon@...gle.com, brho@...gle.com, pjt@...gle.com,
derkling@...gle.com, haoluo@...gle.com, dvernet@...a.com,
dschatzberg@...a.com, dskarlat@...cmu.edu, riel@...riel.com
Cc: linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
kernel-team@...a.com, Tejun Heo <tj@...nel.org>
Subject: [PATCH 09/34] sched: Add @reason to sched_class->rq_{on|off}line()
->rq_{on|off}line are called either during CPU hotplug or cpuset partition
updates. A planned BPF extensible sched_class wants to tell the BPF
scheduler progs about CPU hotplug events in a way that's synchronized with
rq state changes.
As the BPF scheduler progs aren't necessarily affected by cpuset partition
updates, we need a way to distinguish the two types of events. Let's add an
argument to tell them apart.
v2: Patch description updated to detail the expected use.
Signed-off-by: Tejun Heo <tj@...nel.org>
Reviewed-by: David Vernet <dvernet@...a.com>
Acked-by: Josh Don <joshdon@...gle.com>
Acked-by: Hao Luo <haoluo@...gle.com>
Acked-by: Barret Rhoden <brho@...gle.com>
---
kernel/sched/core.c | 12 ++++++------
kernel/sched/deadline.c | 4 ++--
kernel/sched/fair.c | 4 ++--
kernel/sched/rt.c | 4 ++--
kernel/sched/sched.h | 13 +++++++++----
kernel/sched/topology.c | 4 ++--
6 files changed, 23 insertions(+), 18 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f7e7a25a0fdf..297740c4a5bc 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -9547,7 +9547,7 @@ static inline void balance_hotplug_wait(void)
#endif /* CONFIG_HOTPLUG_CPU */
-void set_rq_online(struct rq *rq)
+void set_rq_online(struct rq *rq, enum rq_onoff_reason reason)
{
if (!rq->online) {
const struct sched_class *class;
@@ -9557,19 +9557,19 @@ void set_rq_online(struct rq *rq)
for_each_class(class) {
if (class->rq_online)
- class->rq_online(rq);
+ class->rq_online(rq, reason);
}
}
}
-void set_rq_offline(struct rq *rq)
+void set_rq_offline(struct rq *rq, enum rq_onoff_reason reason)
{
if (rq->online) {
const struct sched_class *class;
for_each_class(class) {
if (class->rq_offline)
- class->rq_offline(rq);
+ class->rq_offline(rq, reason);
}
cpumask_clear_cpu(rq->cpu, rq->rd->online);
@@ -9665,7 +9665,7 @@ int sched_cpu_activate(unsigned int cpu)
rq_lock_irqsave(rq, &rf);
if (rq->rd) {
BUG_ON(!cpumask_test_cpu(cpu, rq->rd->span));
- set_rq_online(rq);
+ set_rq_online(rq, RQ_ONOFF_HOTPLUG);
}
rq_unlock_irqrestore(rq, &rf);
@@ -9710,7 +9710,7 @@ int sched_cpu_deactivate(unsigned int cpu)
if (rq->rd) {
update_rq_clock(rq);
BUG_ON(!cpumask_test_cpu(cpu, rq->rd->span));
- set_rq_offline(rq);
+ set_rq_offline(rq, RQ_ONOFF_HOTPLUG);
}
rq_unlock_irqrestore(rq, &rf);
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 5a9a4b81c972..56b5fc9b0530 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2519,7 +2519,7 @@ static void set_cpus_allowed_dl(struct task_struct *p,
}
/* Assumes rq->lock is held */
-static void rq_online_dl(struct rq *rq)
+static void rq_online_dl(struct rq *rq, enum rq_onoff_reason reason)
{
if (rq->dl.overloaded)
dl_set_overload(rq);
@@ -2530,7 +2530,7 @@ static void rq_online_dl(struct rq *rq)
}
/* Assumes rq->lock is held */
-static void rq_offline_dl(struct rq *rq)
+static void rq_offline_dl(struct rq *rq, enum rq_onoff_reason reason)
{
if (rq->dl.overloaded)
dl_clear_overload(rq);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c0818324a9cd..9838c82230e1 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -11909,14 +11909,14 @@ void trigger_load_balance(struct rq *rq)
nohz_balancer_kick(rq);
}
-static void rq_online_fair(struct rq *rq)
+static void rq_online_fair(struct rq *rq, enum rq_onoff_reason reason)
{
update_sysctl();
update_runtime_enabled(rq);
}
-static void rq_offline_fair(struct rq *rq)
+static void rq_offline_fair(struct rq *rq, enum rq_onoff_reason reason)
{
update_sysctl();
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 00e0e5074115..5c15d017f762 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -2477,7 +2477,7 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p)
}
/* Assumes rq->lock is held */
-static void rq_online_rt(struct rq *rq)
+static void rq_online_rt(struct rq *rq, enum rq_onoff_reason reason)
{
if (rq->rt.overloaded)
rt_set_overload(rq);
@@ -2488,7 +2488,7 @@ static void rq_online_rt(struct rq *rq)
}
/* Assumes rq->lock is held */
-static void rq_offline_rt(struct rq *rq)
+static void rq_offline_rt(struct rq *rq, enum rq_onoff_reason reason)
{
if (rq->rt.overloaded)
rt_clear_overload(rq);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index eddc3775cc92..cd11bf9de7f9 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2183,6 +2183,11 @@ extern const u32 sched_prio_to_wmult[40];
#define RETRY_TASK ((void *)-1UL)
+enum rq_onoff_reason {
+ RQ_ONOFF_HOTPLUG, /* CPU is going on/offline */
+ RQ_ONOFF_TOPOLOGY, /* sched domain topology update */
+};
+
struct affinity_context {
const struct cpumask *new_mask;
struct cpumask *user_mask;
@@ -2219,8 +2224,8 @@ struct sched_class {
void (*set_cpus_allowed)(struct task_struct *p, struct affinity_context *ctx);
- void (*rq_online)(struct rq *rq);
- void (*rq_offline)(struct rq *rq);
+ void (*rq_online)(struct rq *rq, enum rq_onoff_reason reason);
+ void (*rq_offline)(struct rq *rq, enum rq_onoff_reason reason);
struct rq *(*find_lock_rq)(struct task_struct *p, struct rq *rq);
#endif
@@ -2750,8 +2755,8 @@ static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
raw_spin_rq_unlock(rq1);
}
-extern void set_rq_online (struct rq *rq);
-extern void set_rq_offline(struct rq *rq);
+extern void set_rq_online (struct rq *rq, enum rq_onoff_reason reason);
+extern void set_rq_offline(struct rq *rq, enum rq_onoff_reason reason);
extern bool sched_smp_initialized;
#else /* CONFIG_SMP */
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 6682535e37c8..e9a1d61eb186 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -495,7 +495,7 @@ void rq_attach_root(struct rq *rq, struct root_domain *rd)
old_rd = rq->rd;
if (cpumask_test_cpu(rq->cpu, old_rd->online))
- set_rq_offline(rq);
+ set_rq_offline(rq, RQ_ONOFF_TOPOLOGY);
cpumask_clear_cpu(rq->cpu, old_rd->span);
@@ -513,7 +513,7 @@ void rq_attach_root(struct rq *rq, struct root_domain *rd)
cpumask_set_cpu(rq->cpu, rd->span);
if (cpumask_test_cpu(rq->cpu, cpu_active_mask))
- set_rq_online(rq);
+ set_rq_online(rq, RQ_ONOFF_TOPOLOGY);
raw_spin_rq_unlock_irqrestore(rq, flags);
--
2.41.0
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