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-rw-r--r--kernel/posix-cpu-timers.c35
1 files changed, 34 insertions, 1 deletions
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 8fd709c9bb58..0bc33561a435 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -10,6 +10,8 @@
#include <linux/kernel_stat.h>
#include <trace/events/timer.h>
#include <linux/random.h>
+#include <linux/tick.h>
+#include <linux/workqueue.h>
/*
* Called after updating RLIMIT_CPU to run cpu timer and update
@@ -636,6 +638,26 @@ static int cpu_timer_sample_group(const clockid_t which_clock,
return 0;
}
+#ifdef CONFIG_NO_HZ_FULL
+static void nohz_kick_work_fn(struct work_struct *work)
+{
+ tick_nohz_full_kick_all();
+}
+
+static DECLARE_WORK(nohz_kick_work, nohz_kick_work_fn);
+
+/*
+ * We need the IPIs to be sent from sane process context.
+ * The posix cpu timers are always set with irqs disabled.
+ */
+static void posix_cpu_timer_kick_nohz(void)
+{
+ schedule_work(&nohz_kick_work);
+}
+#else
+static inline void posix_cpu_timer_kick_nohz(void) { }
+#endif
+
/*
* Guts of sys_timer_settime for CPU timers.
* This is called with the timer locked and interrupts disabled.
@@ -794,6 +816,8 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int flags,
sample_to_timespec(timer->it_clock,
old_incr, &old->it_interval);
}
+ if (!ret)
+ posix_cpu_timer_kick_nohz();
return ret;
}
@@ -1336,6 +1360,13 @@ void run_posix_cpu_timers(struct task_struct *tsk)
cpu_timer_fire(timer);
spin_unlock(&timer->it_lock);
}
+
+ /*
+ * In case some timers were rescheduled after the queue got emptied,
+ * wake up full dynticks CPUs.
+ */
+ if (tsk->signal->cputimer.running)
+ posix_cpu_timer_kick_nohz();
}
/*
@@ -1366,7 +1397,7 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
}
if (!*newval)
- return;
+ goto out;
*newval += now.cpu;
}
@@ -1384,6 +1415,8 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
tsk->signal->cputime_expires.virt_exp = *newval;
break;
}
+out:
+ posix_cpu_timer_kick_nohz();
}
static int do_cpu_nanosleep(const clockid_t which_clock, int flags,