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Message-ID: <e1f9c9f2023719e0738e16cd6807c74c68b08fad.1399532322.git.yangds.fnst@cn.fujitsu.com>
Date: Thu, 8 May 2014 18:33:48 +0900
From: Dongsheng Yang <yangds.fnst@...fujitsu.com>
To: <mingo@...hat.com>, <peterz@...radead.org>
CC: <linux-kernel@...r.kernel.org>,
Dongsheng Yang <yangds.fnst@...fujitsu.com>
Subject: [PATCH 1/2] 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].
Signed-off-by: Dongsheng Yang <yangds.fnst@...fujitsu.com>
---
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 */
--
1.8.2.1
--
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