Commit-ID: b482e5f5c22ef95ffe7c4d86fc9719455fb24bca
Gitweb: http://git.kernel.org/tip/b482e5f5c22ef95ffe7c4d86fc9719455fb24bca
Author: Dongsheng Yang <yangds.fnst@xxxxxxxxxxxxxx>
AuthorDate: Thu, 8 May 2014 18:33:48 +0900
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 19 May 2014 22:02:42 +0900
sched/prio: Add two inline function named nice_to_rlimit() and rlimit_to_nice() in prio.h.
This patch add two inline functions named nice_to_rlimit() and
rlimit_to_nice() in prio.h. They are handle the convertion between
nice value [19,-20] and rlimit style value [1,40].
Cc: mingo@xxxxxxxxxx
Signed-off-by: Dongsheng Yang <yangds.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/e1f9c9f2023719e0738e16cd6807c74c68b08fad.1399532322.git.yangds.fnst@xxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/sched/prio.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/linux/sched/prio.h b/include/linux/sched/prio.h
index ac32258..d9cf5a5 100644
--- a/include/linux/sched/prio.h
+++ b/include/linux/sched/prio.h
@@ -41,4 +41,20 @@
#define TASK_USER_PRIO(p) USER_PRIO((p)->static_prio)
#define MAX_USER_PRIO (USER_PRIO(MAX_PRIO))
+/*
+ * Convert nice value [19,-20] to rlimit style value [1,40].
+ */
+static inline long nice_to_rlimit(long nice)
+{
+ return (MAX_NICE - nice + 1);
+}
+
+/*
+ * Convert rlimit style value [1,40] to nice value [-20, 19].
+ */
+static inline long rlimit_to_nice(long prio)
+{
+ return (MAX_NICE - prio + 1);
+}
+
#endif /* _SCHED_PRIO_H */
--
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