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authorDongsheng Yang <yangds.fnst@cn.fujitsu.com>2014-01-28 02:15:38 +0400
committerIngo Molnar <mingo@kernel.org>2014-02-09 16:31:51 +0400
commit6b6350f155afdfdf888e18c7bf26950a6d10b0c2 (patch)
tree7a11b997387e666cbfff3f78489d892384c16680 /include/linux/sched
parent5c228079ce8a9bb043a423069a6674dfb9268037 (diff)
downloadlinux-6b6350f155afdfdf888e18c7bf26950a6d10b0c2.tar.xz
sched: Expose some macros related to priority
Some macros in kernel/sched/sched.h about priority are private to kernel/sched. But they are useful to other parts of the core kernel. This patch moves these macros from kernel/sched/sched.h to include/linux/sched/prio.h so that they are available to other subsystems. Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> Cc: raistlin@linux.it Cc: juri.lelli@gmail.com Cc: clark.williams@gmail.com Cc: rostedt@goodmis.org Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/2b022810905b52d13238466807f4b2a691577180.1390859827.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.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/sched/prio.h b/include/linux/sched/prio.h
index 9382ba84d5d0..13216f16762e 100644
--- a/include/linux/sched/prio.h
+++ b/include/linux/sched/prio.h
@@ -20,4 +20,22 @@
#define MAX_PRIO (MAX_RT_PRIO + 40)
#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
+/*
+ * Convert user-nice values [ -20 ... 0 ... 19 ]
+ * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
+ * and back.
+ */
+#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
+ * can work with better when scaling various scheduler parameters,
+ * it's a [ 0 ... 39 ] range.
+ */
+#define USER_PRIO(p) ((p)-MAX_RT_PRIO)
+#define TASK_USER_PRIO(p) USER_PRIO((p)->static_prio)
+#define MAX_USER_PRIO (USER_PRIO(MAX_PRIO))
+
#endif /* _SCHED_PRIO_H */