[PATCH -v3 7/9] sched: Prepare to use balance_push in ttwu()

From: Peter Zijlstra <peterz@infradead.org>
To: mingo@kernel.org, tglx@linutronix.de
Cc: linux-kernel@vger.kernel.org, jiangshanlai@gmail.com,
	valentin.schneider@arm.com, cai@redhat.com,
	vincent.donnefort@arm.com, decui@microsoft.com,
	paulmck@kernel.org, vincent.guittot@linaro.org,
	rostedt@goodmis.org, tj@kernel.org, peterz@infradead.org
Subject: [PATCH -v3 7/9] sched: Prepare to use balance_push in ttwu()
Date: Thu, 21 Jan 2021 11:17:09 +0100	[thread overview]
Message-ID: <20210121103506.966069627@infradead.org> (raw)
In-Reply-To: 20210121101702.402798862@infradead.org

In preparation of using the balance_push state in ttwu() we need it to
provide a reliable and consistent state.

The immediate problem is that rq->balance_callback gets cleared every
schedule() and then re-set in the balance_push_callback() itself. This
is not a reliable signal, so add a variable that stays set during the
entire time.

Also move setting it before the synchronize_rcu() in
sched_cpu_deactivate(), such that we get guaranteed visibility to
ttwu(), which is a preempt-disable region.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 kernel/sched/core.c  |   18 +++++++++++++-----
 kernel/sched/sched.h |    1 +
 2 files changed, 14 insertions(+), 5 deletions(-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7320,6 +7327,7 @@ static void balance_push_set(int cpu, bo
 	struct rq_flags rf;
 
 	rq_lock_irqsave(rq, &rf);
+	rq->balance_push = on;
 	if (on) {
 		WARN_ON_ONCE(rq->balance_callback);
 		rq->balance_callback = &balance_push_callback;
@@ -7489,17 +7497,17 @@ int sched_cpu_deactivate(unsigned int cp
 	int ret;
 
 	set_cpu_active(cpu, false);
+	balance_push_set(cpu, true);
+
 	/*
-	 * We've cleared cpu_active_mask, wait for all preempt-disabled and RCU
-	 * users of this state to go away such that all new such users will
-	 * observe it.
+	 * We've cleared cpu_active_mask / set balance_push, wait for all
+	 * preempt-disabled and RCU users of this state to go away such that
+	 * all new such users will observe it.
 	 *
 	 * Do sync before park smpboot threads to take care the rcu boost case.
 	 */
 	synchronize_rcu();
 
-	balance_push_set(cpu, true);
-
 	rq_lock_irqsave(rq, &rf);
 	if (rq->rd) {
 		update_rq_clock(rq);
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -975,6 +975,7 @@ struct rq {
 	unsigned long		cpu_capacity_orig;
 
 	struct callback_head	*balance_callback;
+	unsigned char		balance_push;
 
 	unsigned char		nohz_idle_balance;
 	unsigned char		idle_balance;


