[PATCH v2 08/12] task_isolation: don't interrupt CPUs with tick_nohz_full_kick_cpu()
STALE2350d
From: Alex Belits <hidden>
Date: 2020-03-08 03:54:07
Also in:
linux-api, linux-arch, linux-arm-kernel, lkml
Subsystem:
nohz, dynticks support, the rest · Maintainers:
Anna-Maria Behnsen, Frederic Weisbecker, Ingo Molnar, Thomas Gleixner, Linus Torvalds
From: Yuri Norov <redacted> 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 <redacted> [abelits@marvell.com: updated, only exclude CPUs running isolated tasks] Signed-off-by: Alex Belits <redacted> --- kernel/time/tick-sched.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 1d4dec9d3ee7..fe4503ba1316 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>
@@ -262,7 +263,7 @@ static void tick_nohz_full_kick(void) */ void tick_nohz_full_kick_cpu(int cpu) { - if (!tick_nohz_full_cpu(cpu)) + 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