linux-kernel - [PATCH v1 5/7] [NOT-FOR-MERGE] test timers affinity adjustment

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Date: Thu, 16 May 2024 22:04:35 +0300
From: Costa Shulyupin <costa.shul@...hat.com>
To: longman@...hat.com,
	pauld@...hat.com,
	juri.lelli@...hat.com,
	prarit@...hat.com,
	vschneid@...hat.com,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Zefan Li <lizefan.x@...edance.com>,
	Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Petr Mladek <pmladek@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yoann Congal <yoann.congal@...le.fr>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Nhat Pham <nphamcs@...il.com>,
	Costa Shulyupin <costa.shul@...hat.com>,
	linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: [PATCH v1 5/7] [NOT-FOR-MERGE] test timers affinity adjustment

There must be no timers on the specified cpu
at the end of timers_resettle_from_cpu.

Signed-off-by: Costa Shulyupin <costa.shul@...hat.com>
---
 kernel/time/timer.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 2d15c0e7b0550..b7d253d230453 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -2658,6 +2658,27 @@ int timers_prepare_cpu(unsigned int cpu)
 	return 0;
 }
 
+static int count_timers(int cpu)
+{
+	struct timer_base *base;
+	int b, v, count = 0;
+
+	for (b = 0; b < NR_BASES; b++) {
+		base = per_cpu_ptr(&timer_bases[b], cpu);
+		raw_spin_lock_irq(&base->lock);
+
+		for (v = 0; v < WHEEL_SIZE; v++) {
+			struct hlist_node *c;
+
+			hlist_for_each(c, base->vectors + v)
+				count++;
+		}
+		raw_spin_unlock_irq(&base->lock);
+	}
+
+	return count;
+}
+
 /**
  * timers_resettle_from_cpu - resettles timers from
  * specified cpu to housekeeping cpus.
@@ -2697,6 +2718,7 @@ void timers_resettle_from_cpu(unsigned int cpu)
 		raw_spin_unlock_irq(&new_base->lock);
 	}
 	local_irq_enable();
+	WARN_ON(count_timers(cpu));
 }
 
 int timers_dead_cpu(unsigned int cpu)
-- 
2.45.0