summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorStephen Boyd <sboyd@codeaurora.org>2011-01-18 22:46:34 -0800
committerIngo Molnar <mingo@elte.hu>2011-01-19 20:08:15 +0100
commit2d0640b47da74cff7c11642c798d40de861ed524 (patch)
tree51d41c213dbd5b27c3eeb6fe7527d04d2918edbb
parentc56eb8fb6dccb83d9fe62fd4dc00c834de9bc470 (diff)
downloadlinux-stable-2d0640b47da74cff7c11642c798d40de861ed524.tar.gz
linux-stable-2d0640b47da74cff7c11642c798d40de861ed524.tar.bz2
linux-stable-2d0640b47da74cff7c11642c798d40de861ed524.zip
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>
-rw-r--r--kernel/time/tick-sched.c7
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)
}
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 */