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author | Dongsheng Yang <yangds.fnst@cn.fujitsu.com> | 2014-01-27 22:00:45 -0500 |
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committer | Ingo Molnar <mingo@kernel.org> | 2014-02-09 15:28:23 +0100 |
commit | d0ea026808ad81de2af14938448419a95211b938 (patch) | |
tree | 217b1467d99ea3b5dbffe9754979ff4d033ef44c /include/linux/sched.h | |
parent | 6b6350f155afdfdf888e18c7bf26950a6d10b0c2 (diff) | |
download | linux-stable-d0ea026808ad81de2af14938448419a95211b938.tar.gz linux-stable-d0ea026808ad81de2af14938448419a95211b938.tar.bz2 linux-stable-d0ea026808ad81de2af14938448419a95211b938.zip |
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/sched.h')
-rw-r--r-- | include/linux/sched.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index d97d0a8e87dc..e3d556427b2e 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); |