diff options
| author | Dongsheng Yang <yangds.fnst@cn.fujitsu.com> | 2014-01-27 17:15:38 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-02-09 13:31:51 +0100 |
| commit | 6b6350f155afdfdf888e18c7bf26950a6d10b0c2 (patch) | |
| tree | 7a11b997387e666cbfff3f78489d892384c16680 /include/linux/sched | |
| parent | 5c228079ce8a9bb043a423069a6674dfb9268037 (diff) | |
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: Dongsheng 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: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/2b022810905b52d13238466807f4b2a691577180.1390859827.git.yangds.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/sched')
| -rw-r--r-- | include/linux/sched/prio.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/sched/prio.h b/include/linux/sched/prio.h index 9382ba84d5d0..13216f16762e 100644 --- a/include/linux/sched/prio.h +++ b/include/linux/sched/prio.h @@ -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 */ |