From: Yuri Norov <ynorov@xxxxxxxxxxx>
For nohz_full CPUs the desirable behavior is to receive interrupts
generated by tick_nohz_full_kick_cpu(). But for hard isolation it's
obviously not desirable because it breaks isolation.
This patch adds check for it.
Signed-off-by: Yuri Norov <ynorov@xxxxxxxxxxx>
[abelits@xxxxxxxxxxx: updated, only exclude CPUs running isolated tasks]
Signed-off-by: Alex Belits <abelits@xxxxxxxxxxx>
---
kernel/time/tick-sched.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index a213952541db..6c8679e200f0 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -20,6 +20,7 @@
#include <linux/sched/clock.h>
#include <linux/sched/stat.h>
#include <linux/sched/nohz.h>
+#include <linux/isolation.h>
#include <linux/module.h>
#include <linux/irq_work.h>
#include <linux/posix-timers.h>
@@ -268,7 +269,8 @@ static void tick_nohz_full_kick(void)
*/
void tick_nohz_full_kick_cpu(int cpu)
{
- if (!tick_nohz_full_cpu(cpu))
+ smp_rmb();
+ if (!tick_nohz_full_cpu(cpu) || task_isolation_on_cpu(cpu))
return;
irq_work_queue_on(&per_cpu(nohz_full_kick_work, cpu), cpu);
--
2.20.1
