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authorDongsheng Yang <yangds.fnst@cn.fujitsu.com>2014-05-08 18:33:49 +0900
committerIngo Molnar <mingo@kernel.org>2014-05-22 11:16:36 +0200
commit7aa2c016db2162defff77f6f5731bff3f25e5175 (patch)
treeaf4d613e911eec6db4ccffeb1d100f718a9de9c5 /include/linux/sched
parenta803f0261bb2bb57aab5542af3174db43b2a3887 (diff)
sched: Consolidate open coded implementations of nice level frobbing into nice_to_rlimit() and rlimit_to_nice()
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/a568a1e3cc8e78648f41b5035fa5e381d36274da.1399532322.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.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/sched/prio.h b/include/linux/sched/prio.h
index ac322583c82..d9cf5a5762d 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 */