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
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#define _LINUX_CPUPRI_H
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#include <linux/sched.h>
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#define CPUPRI_NR_PRIORITIES (MAX_RT_PRIO + 2)
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#define CPUPRI_NR_PRI_WORDS BITS_TO_LONGS(CPUPRI_NR_PRIORITIES)
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#define CPUPRI_INVALID -1
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#define CPUPRI_IDLE 0
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#define CPUPRI_NORMAL 1
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/* values 2-101 are RT priorities 0-99 */
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struct cpupri_vec {
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spinlock_t lock;
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int count;
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cpumask_var_t mask;
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};
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struct cpupri {
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struct cpupri_vec pri_to_cpu[CPUPRI_NR_PRIORITIES];
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long pri_active[CPUPRI_NR_PRI_WORDS];
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int cpu_to_pri[NR_CPUS];
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};
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#ifdef CONFIG_SMP
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int cpupri_find(struct cpupri *cp,
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struct task_struct *p, cpumask_t *lowest_mask);
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void cpupri_set(struct cpupri *cp, int cpu, int pri);
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int cpupri_init(struct cpupri *cp, bool bootmem);
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void cpupri_cleanup(struct cpupri *cp);
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#else
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#define cpupri_set(cp, cpu, pri) do { } while (0)
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#define cpupri_init() do { } while (0)
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#endif
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#endif /* _LINUX_CPUPRI_H */
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