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Subject[PATCH] optional non-interactive mode for cpu scheduler
optional non-interactive mode for cpu scheduler


Some environments desire strict control over cpu resources based on nice
values without interactive determination.

Add a sysctl (/proc/sys/kernel/interactive) to disable dynamic priority
behaviour and interactive reinsertion.

Signed-off-by: Con Kolivas <kernel@kolivas.org>


Index: linux-2.6.10-rc1-mm2/include/linux/sched.h
===================================================================
--- linux-2.6.10-rc1-mm2.orig/include/linux/sched.h 2004-11-02 13:20:03.000000000 +1100
+++ linux-2.6.10-rc1-mm2/include/linux/sched.h 2004-11-02 16:03:53.807209246 +1100
@@ -738,6 +738,7 @@ extern int task_prio(const task_t *p);
extern int task_nice(const task_t *p);
extern int task_curr(const task_t *p);
extern int idle_cpu(int cpu);
+extern int sched_interactive;

void yield(void);

Index: linux-2.6.10-rc1-mm2/include/linux/sysctl.h
===================================================================
--- linux-2.6.10-rc1-mm2.orig/include/linux/sysctl.h 2004-11-02 13:19:19.000000000 +1100
+++ linux-2.6.10-rc1-mm2/include/linux/sysctl.h 2004-11-02 16:07:46.071023189 +1100
@@ -134,6 +134,7 @@ enum
KERN_SPARC_SCONS_PWROFF=64, /* int: serial console power-off halt */
KERN_HZ_TIMER=65, /* int: hz timer on or off */
KERN_UNKNOWN_NMI_PANIC=66, /* int: unknown nmi panic flag */
+ KERN_INTERACTIVE=67, /* int: dynamic priorities */
};


Index: linux-2.6.10-rc1-mm2/kernel/sched.c
===================================================================
--- linux-2.6.10-rc1-mm2.orig/kernel/sched.c 2004-11-02 14:52:51.000000000 +1100
+++ linux-2.6.10-rc1-mm2/kernel/sched.c 2004-11-02 16:13:48.419712248 +1100
@@ -150,8 +150,8 @@
#define DELTA(p) \
(SCALE(TASK_NICE(p), 40, MAX_BONUS) + INTERACTIVE_DELTA)

-#define TASK_INTERACTIVE(p) \
- ((p)->prio <= (p)->static_prio - DELTA(p))
+#define TASK_INTERACTIVE(p) ((sched_interactive) && \
+ ((p)->prio <= (p)->static_prio - DELTA(p)))

#define INTERACTIVE_SLEEP(p) \
(JIFFIES_TO_NS(MAX_SLEEP_AVG * \
@@ -602,6 +602,13 @@ static inline void enqueue_task_head(str
}

/*
+ * This is a sysctl which allows dynamic priorities to be applied based on
+ * interactive behaviour, and selective interactive reinsertion into the
+ * active array despite timeslice expiration.
+ */
+int sched_interactive = 1;
+
+/*
* effective_prio - return the priority that is based on the static
* priority but is modified by bonuses/penalties.
*
@@ -622,6 +629,10 @@ static int effective_prio(task_t *p)
if (rt_task(p))
return p->prio;

+ /* Dynamic priorities are not used with interactive mode off */
+ if (!sched_interactive)
+ return p->static_prio;
+
bonus = CURRENT_BONUS(p) - MAX_BONUS / 2;

prio = p->static_prio - bonus;
Index: linux-2.6.10-rc1-mm2/kernel/sysctl.c
===================================================================
--- linux-2.6.10-rc1-mm2.orig/kernel/sysctl.c 2004-11-02 13:19:19.000000000 +1100
+++ linux-2.6.10-rc1-mm2/kernel/sysctl.c 2004-11-02 16:06:27.621555227 +1100
@@ -624,6 +624,14 @@ static ctl_table kern_table[] = {
.proc_handler = &proc_unknown_nmi_panic,
},
#endif
+ {
+ .ctl_name = KERN_INTERACTIVE,
+ .procname = "interactive",
+ .data = &sched_interactive,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
{ .ctl_name = 0 }
};

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