diff options
author | Stephen Boyd <sboyd@codeaurora.org> | 2011-01-19 01:46:34 -0500 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2011-01-19 14:08:15 -0500 |
commit | 2d0640b47da74cff7c11642c798d40de861ed524 (patch) | |
tree | 51d41c213dbd5b27c3eeb6fe7527d04d2918edbb /kernel | |
parent | c56eb8fb6dccb83d9fe62fd4dc00c834de9bc470 (diff) |
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@codeaurora.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1295419594-13085-1-git-send-email-sboyd@codeaurora.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/time/tick-sched.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 3e216e01bbd1..c55ea2433471 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c | |||
@@ -642,8 +642,7 @@ static void tick_nohz_switch_to_nohz(void) | |||
642 | } | 642 | } |
643 | local_irq_enable(); | 643 | local_irq_enable(); |
644 | 644 | ||
645 | printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n", | 645 | printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n", smp_processor_id()); |
646 | smp_processor_id()); | ||
647 | } | 646 | } |
648 | 647 | ||
649 | /* | 648 | /* |
@@ -795,8 +794,10 @@ void tick_setup_sched_timer(void) | |||
795 | } | 794 | } |
796 | 795 | ||
797 | #ifdef CONFIG_NO_HZ | 796 | #ifdef CONFIG_NO_HZ |
798 | if (tick_nohz_enabled) | 797 | if (tick_nohz_enabled) { |
799 | ts->nohz_mode = NOHZ_MODE_HIGHRES; | 798 | ts->nohz_mode = NOHZ_MODE_HIGHRES; |
799 | printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n", smp_processor_id()); | ||
800 | } | ||
800 | #endif | 801 | #endif |
801 | } | 802 | } |
802 | #endif /* HIGH_RES_TIMERS */ | 803 | #endif /* HIGH_RES_TIMERS */ |