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nohz: Remove nohz_cpu_mask

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RCU no longer uses this global variable, nor does anyone else.  This
commit therefore removes this variable.  This reduces memory footprint
and also removes some atomic instructions and memory barriers from
the dyntick-idle path.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Shi, Alex
2011-07-28 14:56:12 +08:00
committed by Paul E. McKenney
parent d7bd2d68aa
commit fc0763f53e
3 changed files with 0 additions and 18 deletions
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6
kernel/time/tick-sched.c
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@ -139,7 +139,6 @@ static void tick_nohz_update_jiffies(ktime_t now)
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
unsigned long flags;
cpumask_clear_cpu(cpu, nohz_cpu_mask);
ts->idle_waketime = now;
local_irq_save(flags);
@ -389,9 +388,6 @@ void tick_nohz_stop_sched_tick(int inidle)
else
expires.tv64 = KTIME_MAX;
if (delta_jiffies > 1)
cpumask_set_cpu(cpu, nohz_cpu_mask);
/* Skip reprogram of event if its not changed */
if (ts->tick_stopped && ktime_equal(expires, dev->next_event))
goto out;
@ -441,7 +437,6 @@ void tick_nohz_stop_sched_tick(int inidle)
* softirq.
*/
tick_do_update_jiffies64(ktime_get());
cpumask_clear_cpu(cpu, nohz_cpu_mask);
}
raise_softirq_irqoff(TIMER_SOFTIRQ);
out:
@ -524,7 +519,6 @@ void tick_nohz_restart_sched_tick(void)
/* Update jiffies first */
select_nohz_load_balancer(0);
tick_do_update_jiffies64(now);
cpumask_clear_cpu(cpu, nohz_cpu_mask);
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
/*