sched/rt: Add a tuning knob to allow changing SCHED_RR timeslice
Add a /proc/sys/kernel scheduler knob named
sched_rr_timeslice_ms that allows global changing of the
SCHED_RR timeslice value. User visable value is in milliseconds
but is stored as jiffies. Setting to 0 (zero) resets to the
default (currently 100ms).
Signed-off-by: Clark Williams <williams@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20130207094704.13751796@riff.lan
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
index bac914e..d2bb0ae 100644
--- a/include/linux/sched/sysctl.h
+++ b/include/linux/sched/sysctl.h
@@ -73,6 +73,13 @@
return 1;
}
#endif
+
+/*
+ * control realtime throttling:
+ *
+ * /proc/sys/kernel/sched_rt_period_us
+ * /proc/sys/kernel/sched_rt_runtime_us
+ */
extern unsigned int sysctl_sched_rt_period;
extern int sysctl_sched_rt_runtime;
@@ -90,7 +97,13 @@
*/
#define RR_TIMESLICE (100 * HZ / 1000)
-int sched_rt_handler(struct ctl_table *table, int write,
+extern int sched_rr_timeslice;
+
+extern int sched_rr_handler(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos);
+
+extern int sched_rt_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos);