Commit-ID: fe96565ce90aca25786d709ebb5fb5e49b8bbafe
Gitweb: http://git.kernel.org/tip/fe96565ce90aca25786d709ebb5fb5e49b8bbafe
Author: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
AuthorDate: Tue, 18 Jan 2011 22:46:34 -0800
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 19 Jan 2011 12:08:44 +0100
hrtimers: Notify hrtimer users of switches to NOHZ mode
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.
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.
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
LKML-Reference: <1295419594-13085-1-git-send-email-sboyd@xxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/time/tick-sched.c | 9 +++++----
1 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 3e216e0..9760f4f 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -640,10 +640,8 @@ static void tick_nohz_switch_to_nohz(void)
break;
next = ktime_add(next, tick_period);
}
+ printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n", smp_processor_id());
local_irq_enable();
-
- printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n",
- smp_processor_id());
}
/*
@@ -795,8 +793,11 @@ 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 */
--
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