Commit 6b6350f1 authored by Dongsheng Yang's avatar Dongsheng Yang Committed by Ingo Molnar
Browse files

sched: Expose some macros related to priority 



Some macros in kernel/sched/sched.h about priority are
private to kernel/sched. But they are useful to other
parts of the core kernel.

This patch moves these macros from kernel/sched/sched.h to
include/linux/sched/prio.h so that they are available to
other subsystems.

Signed-off-by: default avatarDongsheng Yang <yangds.fnst@cn.fujitsu.com>
Cc: raistlin@linux.it
Cc: juri.lelli@gmail.com
Cc: clark.williams@gmail.com
Cc: rostedt@goodmis.org
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/2b022810905b52d13238466807f4b2a691577180.1390859827.git.yangds.fnst@cn.fujitsu.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 5c228079

include/linux/sched/prio.h

+18 −0
Original line number Diff line number Diff line
@@ -20,4 +20,22 @@ 
#define MAX_PRIO		(MAX_RT_PRIO + 40)

#define DEFAULT_PRIO		(MAX_RT_PRIO + 20)



/*

 * Convert user-nice values [ -20 ... 0 ... 19 ]

 * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],

 * and back.

 */

#define NICE_TO_PRIO(nice)	(MAX_RT_PRIO + (nice) + 20)

#define PRIO_TO_NICE(prio)	((prio) - MAX_RT_PRIO - 20)

#define TASK_NICE(p)		PRIO_TO_NICE((p)->static_prio)



/*

 * 'User priority' is the nice value converted to something we

 * can work with better when scaling various scheduler parameters,

 * it's a [ 0 ... 39 ] range.

 */

#define USER_PRIO(p)		((p)-MAX_RT_PRIO)

#define TASK_USER_PRIO(p)	USER_PRIO((p)->static_prio)

#define MAX_USER_PRIO		(USER_PRIO(MAX_PRIO))



#endif /* _SCHED_PRIO_H */

kernel/sched/sched.h

+0 −18
Original line number Diff line number Diff line
@@ -23,24 +23,6 @@ extern atomic_long_t calc_load_tasks; 
extern long calc_load_fold_active(struct rq *this_rq);

extern void update_cpu_load_active(struct rq *this_rq);



/*

 * Convert user-nice values [ -20 ... 0 ... 19 ]

 * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],

 * and back.

 */

#define NICE_TO_PRIO(nice)	(MAX_RT_PRIO + (nice) + 20)

#define PRIO_TO_NICE(prio)	((prio) - MAX_RT_PRIO - 20)

#define TASK_NICE(p)		PRIO_TO_NICE((p)->static_prio)



/*

 * 'User priority' is the nice value converted to something we

 * can work with better when scaling various scheduler parameters,

 * it's a [ 0 ... 39 ] range.

 */

#define USER_PRIO(p)		((p)-MAX_RT_PRIO)

#define TASK_USER_PRIO(p)	USER_PRIO((p)->static_prio)

#define MAX_USER_PRIO		(USER_PRIO(MAX_PRIO))



/*

 * Helpers for converting nanosecond timing to jiffy resolution

 */

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