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authorShi, Alex <alex.shi@intel.com>2011-07-28 08:56:12 +0200
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-09-29 06:38:29 +0200
commitfc0763f53e3ff6a6bfa66934662a3446b9ca6f16 (patch)
tree2671d3f6275c9707a620032658ecb05025e4e9fa /kernel/time
parentrcu: Document interpretation of RCU-lockdep splats (diff)
downloadlinux-fc0763f53e3ff6a6bfa66934662a3446b9ca6f16.tar.xz
linux-fc0763f53e3ff6a6bfa66934662a3446b9ca6f16.zip
nohz: Remove nohz_cpu_mask
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>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/tick-sched.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index d5097c44b407..eb98e55196b9 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -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
/*