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| author | Rusty Russell <rusty@rustcorp.com.au> | 2008-11-25 02:35:13 +1030 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-24 17:52:35 +0100 |
| commit | 0e3900e6d3b04c44737ebc505604dcd8ed30e354 (patch) | |
| tree | 1c791c57282972db3181d4fb1e7c98c5948f96c2 | |
| parent | 24600ce89a819a8f2fb4fd69fd777218a82ade20 (diff) | |
| download | linux-stable-0e3900e6d3b04c44737ebc505604dcd8ed30e354.tar.gz linux-stable-0e3900e6d3b04c44737ebc505604dcd8ed30e354.tar.bz2 linux-stable-0e3900e6d3b04c44737ebc505604dcd8ed30e354.zip | |
sched: convert local_cpu_mask to cpumask_var_t.
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>
| -rw-r--r-- | kernel/sched.c | 1 | ||||
| -rw-r--r-- | kernel/sched_rt.c | 13 |
2 files changed, 12 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 94fa333c1e7c..f2be61870030 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -8018,6 +8018,7 @@ void __init sched_init_smp(void) free_cpumask_var(non_isolated_cpus); alloc_cpumask_var(&fallback_doms, GFP_KERNEL); + init_sched_rt_class(); } #else void __init sched_init_smp(void) diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c index 1fa13624293e..1f0e99d1a8ce 100644 --- a/kernel/sched_rt.c +++ b/kernel/sched_rt.c @@ -962,7 +962,7 @@ static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu) return next; } -static DEFINE_PER_CPU(cpumask_t, local_cpu_mask); +static DEFINE_PER_CPU(cpumask_var_t, local_cpu_mask); static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask) { @@ -982,7 +982,7 @@ static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask) static int find_lowest_rq(struct task_struct *task) { struct sched_domain *sd; - cpumask_t *lowest_mask = &__get_cpu_var(local_cpu_mask); + cpumask_t *lowest_mask = __get_cpu_var(local_cpu_mask); int this_cpu = smp_processor_id(); int cpu = task_cpu(task); @@ -1551,3 +1551,12 @@ static void print_rt_stats(struct seq_file *m, int cpu) rcu_read_unlock(); } #endif /* CONFIG_SCHED_DEBUG */ + +/* Note that this is never called for !SMP, but that's OK. */ +static inline void init_sched_rt_class(void) +{ + unsigned int i; + + for_each_possible_cpu(i) + alloc_cpumask_var(&per_cpu(local_cpu_mask, i), GFP_KERNEL); +} |