forked from luck/tmp_suning_uos_patched
68e74568fb
Impact: stack usage reduction, (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. The fact cpupro_init is called both before and after the slab is available makes for an ugly parameter unfortunately. We also use cpumask_any_and to get rid of a temporary in cpupri_find. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
38 lines
936 B
C
38 lines
936 B
C
#ifndef _LINUX_CPUPRI_H
|
|
#define _LINUX_CPUPRI_H
|
|
|
|
#include <linux/sched.h>
|
|
|
|
#define CPUPRI_NR_PRIORITIES (MAX_RT_PRIO + 2)
|
|
#define CPUPRI_NR_PRI_WORDS BITS_TO_LONGS(CPUPRI_NR_PRIORITIES)
|
|
|
|
#define CPUPRI_INVALID -1
|
|
#define CPUPRI_IDLE 0
|
|
#define CPUPRI_NORMAL 1
|
|
/* values 2-101 are RT priorities 0-99 */
|
|
|
|
struct cpupri_vec {
|
|
spinlock_t lock;
|
|
int count;
|
|
cpumask_var_t mask;
|
|
};
|
|
|
|
struct cpupri {
|
|
struct cpupri_vec pri_to_cpu[CPUPRI_NR_PRIORITIES];
|
|
long pri_active[CPUPRI_NR_PRI_WORDS];
|
|
int cpu_to_pri[NR_CPUS];
|
|
};
|
|
|
|
#ifdef CONFIG_SMP
|
|
int cpupri_find(struct cpupri *cp,
|
|
struct task_struct *p, cpumask_t *lowest_mask);
|
|
void cpupri_set(struct cpupri *cp, int cpu, int pri);
|
|
int cpupri_init(struct cpupri *cp, bool bootmem);
|
|
void cpupri_cleanup(struct cpupri *cp);
|
|
#else
|
|
#define cpupri_set(cp, cpu, pri) do { } while (0)
|
|
#define cpupri_init() do { } while (0)
|
|
#endif
|
|
|
|
#endif /* _LINUX_CPUPRI_H */
|