From 2d0640b47da74cff7c11642c798d40de861ed524 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Tue, 18 Jan 2011 22:46:34 -0800 Subject: [PATCH] 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 Acked-by: Thomas Gleixner Cc: Peter Zijlstra LKML-Reference: <1295419594-13085-1-git-send-email-sboyd@codeaurora.org> Signed-off-by: Ingo Molnar --- kernel/time/tick-sched.c | 7 ++++--- 1 file 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) } local_irq_enable(); - printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n", - smp_processor_id()); + printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n", smp_processor_id()); } /* @@ -795,8 +794,10 @@ void tick_setup_sched_timer(void) } #ifdef CONFIG_NO_HZ - if (tick_nohz_enabled) + if (tick_nohz_enabled) { ts->nohz_mode = NOHZ_MODE_HIGHRES; + printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n", smp_processor_id()); + } #endif } #endif /* HIGH_RES_TIMERS */ -- 2.20.1