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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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7
kernel/sched.c
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@@ -5870,9 +5870,9 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
* indicates which cpus entered this state. This is used
* in the rcu update to wait only for active cpus. For system
* which do not switch off the HZ timer nohz_cpu_mask should
* always be CPU_MASK_NONE.
* always be CPU_BITS_NONE.
*/
cpumask_t nohz_cpu_mask = CPU_MASK_NONE;
cpumask_var_t nohz_cpu_mask;
/*
* Increase the granularity value when there are more CPUs,
@@ -8274,6 +8274,9 @@ void __init sched_init(void)
*/
current->sched_class = &fair_sched_class;
/* Allocate the nohz_cpu_mask if CONFIG_CPUMASK_OFFSTACK */
alloc_bootmem_cpumask_var(&nohz_cpu_mask);
scheduler_running = 1;
}