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Subject[PATCH] sched: Notify hrtimer users of switches to NOHZ mode
Date
When NOHZ=y and high res timers are disabled (via cmdline or
Kconfig) tick_nohz_switch_to_nohz() will notify the user about
switching into NOHZ mode. Nothing is printed for the case where
HIGH_RES_TIMERS=y. Fix this for the HIGH_RES_TIMERS=y case by
duplicating the printk from the low res NOHZ path in the high res
NOHZ path.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---

This confused me since I was thinking 'dmesg | grep -i NOHZ' would
tell me if NOHZ was enabled, but if I have hrtimers there is
nothing. If we don't do this we should probably remove the original
printk.

kernel/time/tick-sched.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 3e216e0..6c012c5 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -795,8 +795,11 @@ void tick_setup_sched_timer(void)
}

#ifdef CONFIG_NO_HZ
- if (tick_nohz_enabled)
+ if (tick_nohz_enabled) {
ts->nohz_mode = NOHZ_MODE_HIGHRES;
+ pr_info("Switched to NOHz mode on CPU #%d\n",
+ smp_processor_id());
+ }
#endif
}
#endif /* HIGH_RES_TIMERS */
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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