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rcu: Make RCU_FAST_NO_HZ respect nohz= boot parameter

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If the nohz= boot parameter disables nohz, then RCU_FAST_NO_HZ needs to
also disable itself.  This commit therefore checks for tick_nohz_enabled
being zero, disabling rcu_prepare_for_idle() if so.  This commit assumes
that tick_nohz_enabled can change at runtime: If this is not the case,
then a simpler approach suffices.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2012-06-24 10:15:02 -07:00
committed by Paul E. McKenney
parent 4fa3b6cb1b
commit 9d2ad24306
3 changed files with 17 additions and 1 deletions
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2
kernel/time/tick-sched.c
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@@ -105,7 +105,7 @@ static ktime_t tick_init_jiffy_update(void)
/*
* NO HZ enabled ?
*/
static int tick_nohz_enabled __read_mostly = 1;
int tick_nohz_enabled __read_mostly = 1;
/*
* Enable / Disable tickless mode