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sched: convert nohz_cpu_mask to cpumask_var_t.

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Impact: (future) size reduction for large NR_CPUS.

Dynamically allocating cpumasks (when CONFIG_CPUMASK_OFFSTACK) saves
space for small nr_cpu_ids but big CONFIG_NR_CPUS.  cpumask_var_t
is just a struct cpumask for !CONFIG_CPUMASK_OFFSTACK.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Rusty Russell
2008-11-25 02:35:04 +10:30
committed by Ingo Molnar
parent 6c99e9ad47
commit 6a7b3dc344
4 changed files with 12 additions and 9 deletions
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10
kernel/time/tick-sched.c
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@@ -144,7 +144,7 @@ void tick_nohz_update_jiffies(void)
if (!ts->tick_stopped)
return;
cpu_clear(cpu, nohz_cpu_mask);
cpumask_clear_cpu(cpu, nohz_cpu_mask);
now = ktime_get();
ts->idle_waketime = now;
@@ -283,7 +283,7 @@ void tick_nohz_stop_sched_tick(int inidle)
if ((long)delta_jiffies >= 1) {
if (delta_jiffies > 1)
cpu_set(cpu, nohz_cpu_mask);
cpumask_set_cpu(cpu, nohz_cpu_mask);
/*
* nohz_stop_sched_tick can be called several times before
* the nohz_restart_sched_tick is called. This happens when
@@ -296,7 +296,7 @@ void tick_nohz_stop_sched_tick(int inidle)
/*
* sched tick not stopped!
*/
cpu_clear(cpu, nohz_cpu_mask);
cpumask_clear_cpu(cpu, nohz_cpu_mask);
goto out;
}
@@ -354,7 +354,7 @@ void tick_nohz_stop_sched_tick(int inidle)
* softirq.
*/
tick_do_update_jiffies64(ktime_get());
cpu_clear(cpu, nohz_cpu_mask);
cpumask_clear_cpu(cpu, nohz_cpu_mask);
}
raise_softirq_irqoff(TIMER_SOFTIRQ);
out:
@@ -432,7 +432,7 @@ void tick_nohz_restart_sched_tick(void)
select_nohz_load_balancer(0);
now = ktime_get();
tick_do_update_jiffies64(now);
cpu_clear(cpu, nohz_cpu_mask);
cpumask_clear_cpu(cpu, nohz_cpu_mask);
/*
* We stopped the tick in idle. Update process times would miss the