diff options
| author | Dongsheng Yang <yangds.fnst@cn.fujitsu.com> | 2014-01-27 22:00:45 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-02-09 15:28:23 +0100 |
| commit | d0ea026808ad81de2af14938448419a95211b938 (patch) | |
| tree | 217b1467d99ea3b5dbffe9754979ff4d033ef44c /include/linux | |
| parent | 6b6350f155afdfdf888e18c7bf26950a6d10b0c2 (diff) | |
sched: Implement task_nice() as static inline function
As patch "sched: Move the priority specific bits into a new header file" exposes
the priority related macros in linux/sched/prio.h, we don't have to implement
task_nice() in kernel/sched/core.c any more.
This patch implements it in linux/sched/sched.h as static inline function,
saving the kernel stack and enhancing performance a bit.
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Cc: clark.williams@gmail.com
Cc: rostedt@goodmis.org
Cc: raistlin@linux.it
Cc: juri.lelli@gmail.com
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1390878045-7096-1-git-send-email-yangds.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sched.h | 11 | ||||
| -rw-r--r-- | include/linux/sched/prio.h | 1 |
2 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index d97d0a8e87d..e3d556427b2 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2094,7 +2094,16 @@ static inline void sched_autogroup_exit(struct signal_struct *sig) { } extern bool yield_to(struct task_struct *p, bool preempt); extern void set_user_nice(struct task_struct *p, long nice); extern int task_prio(const struct task_struct *p); -extern int task_nice(const struct task_struct *p); +/** + * task_nice - return the nice value of a given task. + * @p: the task in question. + * + * Return: The nice value [ -20 ... 0 ... 19 ]. + */ +static inline int task_nice(const struct task_struct *p) +{ + return PRIO_TO_NICE((p)->static_prio); +} extern int can_nice(const struct task_struct *p, const int nice); extern int task_curr(const struct task_struct *p); extern int idle_cpu(int cpu); diff --git a/include/linux/sched/prio.h b/include/linux/sched/prio.h index 13216f16762..410ccb74c9e 100644 --- a/include/linux/sched/prio.h +++ b/include/linux/sched/prio.h @@ -27,7 +27,6 @@ */ #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 |