[PATCH] Staircase 7.1 for 2.6.7-mm1
From: Panagiotis Papadakos
Date: Mon Jun 21 2004 - 18:29:26 EST
Here is a patch for 2.6.7-mm1.
Regards
Panagiotis Papadakosdiff -Naurp linux-2.6.7-mm1-no/fs/proc/array.c linux-2.6.7-mm1/fs/proc/array.c
--- linux-2.6.7-mm1-no/fs/proc/array.c 2004-06-19 02:45:47.000000000 +0300
+++ linux-2.6.7-mm1/fs/proc/array.c 2004-06-22 01:10:29.000000000 +0300
@@ -155,7 +155,7 @@ static inline char * task_state(struct t
read_lock(&tasklist_lock);
buffer += sprintf(buffer,
"State:\t%s\n"
- "SleepAVG:\t%lu%%\n"
+ "Burst:\t%d\n"
"Tgid:\t%d\n"
"Pid:\t%d\n"
"PPid:\t%d\n"
@@ -163,7 +163,7 @@ static inline char * task_state(struct t
"Uid:\t%d\t%d\t%d\t%d\n"
"Gid:\t%d\t%d\t%d\t%d\n",
get_task_state(p),
- (p->sleep_avg/1024)*100/(1020000000/1024),
+ p->burst,
p->tgid,
p->pid, p->pid ? p->real_parent->pid : 0,
p->pid && p->ptrace ? p->parent->pid : 0,
diff -Naurp linux-2.6.7-mm1-no/include/linux/sched.h linux-2.6.7-mm1/include/linux/sched.h
--- linux-2.6.7-mm1-no/include/linux/sched.h 2004-06-22 01:30:26.000000000 +0300
+++ linux-2.6.7-mm1/include/linux/sched.h 2004-06-22 01:10:29.000000000 +0300
@@ -172,6 +172,7 @@ extern void show_stack(struct task_struc
void io_schedule(void);
long io_schedule_timeout(long timeout);
+extern int interactive, compute;
extern void cpu_init (void);
extern void trap_init(void);
@@ -334,7 +335,6 @@ extern struct user_struct *find_user(uid
extern struct user_struct root_user;
#define INIT_USER (&root_user)
-typedef struct prio_array prio_array_t;
struct backing_dev_info;
struct reclaim_state;
@@ -406,16 +406,13 @@ struct task_struct {
int prio, static_prio;
struct list_head run_list;
- prio_array_t *array;
-
- unsigned long sleep_avg;
- long interactive_credit;
unsigned long long timestamp;
- int activated;
+ unsigned long runtime, totalrun;
+ unsigned int burst;
unsigned long policy;
cpumask_t cpus_allowed;
- unsigned int time_slice, first_time_slice;
+ unsigned int slice, time_slice;
struct list_head tasks;
struct list_head ptrace_children;
@@ -790,7 +787,6 @@ extern void FASTCALL(wake_up_forked_proc
}
#endif
extern void FASTCALL(sched_fork(task_t * p));
-extern void FASTCALL(sched_exit(task_t * p));
extern int in_group_p(gid_t);
extern int in_egroup_p(gid_t);
diff -Naurp linux-2.6.7-mm1-no/include/linux/sysctl.h linux-2.6.7-mm1/include/linux/sysctl.h
--- linux-2.6.7-mm1-no/include/linux/sysctl.h 2004-06-22 01:30:26.000000000 +0300
+++ linux-2.6.7-mm1/include/linux/sysctl.h 2004-06-22 01:10:29.000000000 +0300
@@ -133,6 +133,8 @@ enum
KERN_NGROUPS_MAX=63, /* int: NGROUPS_MAX */
KERN_SPARC_SCONS_PWROFF=64, /* int: serial console power-off halt */
KERN_HZ_TIMER=65, /* int: hz timer on or off */
+ KERN_INTERACTIVE=66, /* interactive tasks can have cpu bursts */
+ KERN_COMPUTE=67, /* adjust timeslices for a compute server */
};
diff -Naurp linux-2.6.7-mm1-no/init/main.c linux-2.6.7-mm1/init/main.c
--- linux-2.6.7-mm1-no/init/main.c 2004-06-22 01:30:26.000000000 +0300
+++ linux-2.6.7-mm1/init/main.c 2004-06-22 01:10:29.000000000 +0300
@@ -326,8 +326,15 @@ static void __init smp_init(void)
#define smp_init() do { } while (0)
#endif
+unsigned long cache_decay_ticks;
static inline void setup_per_cpu_areas(void) { }
-static inline void smp_prepare_cpus(unsigned int maxcpus) { }
+static void smp_prepare_cpus(unsigned int maxcpus)
+{
+ // Generic 2 tick cache_decay for uniprocessor
+ cache_decay_ticks = 2;
+ printk("Generic cache decay timeout: %ld msecs.\n",
+ (cache_decay_ticks * 1000 / HZ));
+}
#else
diff -Naurp linux-2.6.7-mm1-no/kernel/exit.c linux-2.6.7-mm1/kernel/exit.c
--- linux-2.6.7-mm1-no/kernel/exit.c 2004-06-22 01:30:26.000000000 +0300
+++ linux-2.6.7-mm1/kernel/exit.c 2004-06-22 01:10:29.000000000 +0300
@@ -96,7 +96,6 @@ repeat:
p->parent->cmaj_flt += p->maj_flt + p->cmaj_flt;
p->parent->cnvcsw += p->nvcsw + p->cnvcsw;
p->parent->cnivcsw += p->nivcsw + p->cnivcsw;
- sched_exit(p);
write_unlock_irq(&tasklist_lock);
spin_unlock(&p->proc_lock);
proc_pid_flush(proc_dentry);
diff -Naurp linux-2.6.7-mm1-no/kernel/sched.c linux-2.6.7-mm1/kernel/sched.c
--- linux-2.6.7-mm1-no/kernel/sched.c 2004-06-22 01:30:26.000000000 +0300
+++ linux-2.6.7-mm1/kernel/sched.c 2004-06-22 01:26:00.000000000 +0300
@@ -16,6 +16,8 @@
* by Davide Libenzi, preemptible kernel bits by Robert Love.
* 2003-09-03 Interactivity tuning by Con Kolivas.
* 2004-04-02 Scheduler domains code by Nick Piggin
+ * 2004-06-11 New staircase scheduling policy by Con Kolivas with help
+ * from William Lee Irwin III, Zwane Mwaikambo & Peter Williams.
*/
#include <linux/mm.h>
@@ -47,12 +49,6 @@
#include <asm/unistd.h>
-#ifdef CONFIG_NUMA
-#define cpu_to_node_mask(cpu) node_to_cpumask(cpu_to_node(cpu))
-#else
-#define cpu_to_node_mask(cpu) (cpu_online_map)
-#endif
-
/*
* Convert user-nice values [ -20 ... 0 ... 19 ]
* to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
@@ -70,118 +66,20 @@
#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))
-#define AVG_TIMESLICE (MIN_TIMESLICE + ((MAX_TIMESLICE - MIN_TIMESLICE) *\
- (MAX_PRIO-1-NICE_TO_PRIO(0))/(MAX_USER_PRIO - 1)))
/*
* Some helpers for converting nanosecond timing to jiffy resolution
*/
#define NS_TO_JIFFIES(TIME) ((TIME) / (1000000000 / HZ))
-#define JIFFIES_TO_NS(TIME) ((TIME) * (1000000000 / HZ))
-
-/*
- * These are the 'tuning knobs' of the scheduler:
- *
- * Minimum timeslice is 10 msecs, default timeslice is 100 msecs,
- * maximum timeslice is 200 msecs. Timeslices get refilled after
- * they expire.
- */
-#define MIN_TIMESLICE ( 10 * HZ / 1000)
-#define MAX_TIMESLICE (200 * HZ / 1000)
-#define ON_RUNQUEUE_WEIGHT 30
-#define CHILD_PENALTY 95
-#define PARENT_PENALTY 100
-#define EXIT_WEIGHT 3
-#define PRIO_BONUS_RATIO 25
-#define MAX_BONUS (MAX_USER_PRIO * PRIO_BONUS_RATIO / 100)
-#define INTERACTIVE_DELTA 2
-#define MAX_SLEEP_AVG (AVG_TIMESLICE * MAX_BONUS)
-#define STARVATION_LIMIT (MAX_SLEEP_AVG)
-#define NS_MAX_SLEEP_AVG (JIFFIES_TO_NS(MAX_SLEEP_AVG))
-#define CREDIT_LIMIT 100
-
-/*
- * If a task is 'interactive' then we reinsert it in the active
- * array after it has expired its current timeslice. (it will not
- * continue to run immediately, it will still roundrobin with
- * other interactive tasks.)
- *
- * This part scales the interactivity limit depending on niceness.
- *
- * We scale it linearly, offset by the INTERACTIVE_DELTA delta.
- * Here are a few examples of different nice levels:
- *
- * TASK_INTERACTIVE(-20): [1,1,1,1,1,1,1,1,1,0,0]
- * TASK_INTERACTIVE(-10): [1,1,1,1,1,1,1,0,0,0,0]
- * TASK_INTERACTIVE( 0): [1,1,1,1,0,0,0,0,0,0,0]
- * TASK_INTERACTIVE( 10): [1,1,0,0,0,0,0,0,0,0,0]
- * TASK_INTERACTIVE( 19): [0,0,0,0,0,0,0,0,0,0,0]
- *
- * (the X axis represents the possible -5 ... 0 ... +5 dynamic
- * priority range a task can explore, a value of '1' means the
- * task is rated interactive.)
- *
- * Ie. nice +19 tasks can never get 'interactive' enough to be
- * reinserted into the active array. And only heavily CPU-hog nice -20
- * tasks will be expired. Default nice 0 tasks are somewhere between,
- * it takes some effort for them to get interactive, but it's not
- * too hard.
- */
-
-#define CURRENT_BONUS(p) \
- (NS_TO_JIFFIES((p)->sleep_avg) * MAX_BONUS / \
- MAX_SLEEP_AVG)
-
-#ifdef CONFIG_SMP
-#define TIMESLICE_GRANULARITY(p) (MIN_TIMESLICE * \
- (1 << (((MAX_BONUS - CURRENT_BONUS(p)) ? : 1) - 1)) * \
- num_online_cpus())
-#else
-#define TIMESLICE_GRANULARITY(p) (MIN_TIMESLICE * \
- (1 << (((MAX_BONUS - CURRENT_BONUS(p)) ? : 1) - 1)))
-#endif
-
-#define SCALE(v1,v1_max,v2_max) \
- (v1) * (v2_max) / (v1_max)
-
-#define DELTA(p) \
- (SCALE(TASK_NICE(p), 40, MAX_BONUS) + INTERACTIVE_DELTA)
-#define TASK_INTERACTIVE(p) \
- ((p)->prio <= (p)->static_prio - DELTA(p))
-
-#define INTERACTIVE_SLEEP(p) \
- (JIFFIES_TO_NS(MAX_SLEEP_AVG * \
- (MAX_BONUS / 2 + DELTA((p)) + 1) / MAX_BONUS - 1))
-
-#define HIGH_CREDIT(p) \
- ((p)->interactive_credit > CREDIT_LIMIT)
-
-#define LOW_CREDIT(p) \
- ((p)->interactive_credit < -CREDIT_LIMIT)
-
-#define TASK_PREEMPTS_CURR(p, rq) \
- ((p)->prio < (rq)->curr->prio)
-
-/*
- * BASE_TIMESLICE scales user-nice values [ -20 ... 19 ]
- * to time slice values.
- *
- * The higher a thread's priority, the bigger timeslices
- * it gets during one round of execution. But even the lowest
- * priority thread gets MIN_TIMESLICE worth of execution time.
- *
- * task_timeslice() is the interface that is used by the scheduler.
+int compute = 0;
+/*
+ *This is the time all tasks within the same priority round robin.
+ *compute setting is reserved for dedicated computational scheduling
+ *and has ten times larger intervals.
*/
-
-#define BASE_TIMESLICE(p) (MIN_TIMESLICE + \
- ((MAX_TIMESLICE - MIN_TIMESLICE) * \
- (MAX_PRIO-1 - (p)->static_prio) / (MAX_USER_PRIO-1)))
-
-static unsigned int task_timeslice(task_t *p)
-{
- return BASE_TIMESLICE(p);
-}
+#define _RR_INTERVAL ((10 * HZ / 1000) ? : 1)
+#define RR_INTERVAL (_RR_INTERVAL * (1 + 9 * compute))
#define task_hot(p, now, sd) ((now) - (p)->timestamp < (sd)->cache_hot_time)
@@ -189,16 +87,8 @@ static unsigned int task_timeslice(task_
* These are the runqueue data structures:
*/
-#define BITMAP_SIZE ((((MAX_PRIO+1+7)/8)+sizeof(long)-1)/sizeof(long))
-
typedef struct runqueue runqueue_t;
-struct prio_array {
- unsigned int nr_active;
- unsigned long bitmap[BITMAP_SIZE];
- struct list_head queue[MAX_PRIO];
-};
-
/*
* This is the main, per-CPU runqueue data structure.
*
@@ -218,13 +108,13 @@ struct runqueue {
unsigned long cpu_load;
#endif
unsigned long long nr_switches;
- unsigned long expired_timestamp, nr_uninterruptible;
+ unsigned long nr_uninterruptible;
unsigned long long timestamp_last_tick;
+ unsigned int cache_ticks, preempted;
task_t *curr, *idle;
-
struct mm_struct *prev_mm;
- prio_array_t *active, *expired, arrays[2];
- int best_expired_prio;
+ unsigned long bitmap[BITS_TO_LONGS(MAX_PRIO+1)];
+ struct list_head queue[MAX_PRIO + 1];
atomic_t nr_iowait;
#ifdef CONFIG_SMP
@@ -403,67 +293,47 @@ static inline void rq_unlock(runqueue_t
spin_unlock_irq(&rq->lock);
}
-/*
- * Adding/removing a task to/from a priority array:
- */
-static void dequeue_task(struct task_struct *p, prio_array_t *array)
+static int task_preempts_curr(struct task_struct *p, runqueue_t *rq)
{
- array->nr_active--;
- list_del(&p->run_list);
- if (list_empty(array->queue + p->prio))
- __clear_bit(p->prio, array->bitmap);
+ if (p->prio >= rq->curr->prio)
+ return 0;
+ if (!compute || rq->cache_ticks >= cache_decay_ticks ||
+ rt_task(p) || !p->mm || rq->curr == rq->idle)
+ return 1;
+ rq->preempted = 1;
+ return 0;
}
-static void enqueue_task(struct task_struct *p, prio_array_t *array)
+static inline int task_queued(task_t *task)
{
- list_add_tail(&p->run_list, array->queue + p->prio);
- __set_bit(p->prio, array->bitmap);
- array->nr_active++;
- p->array = array;
+ return !list_empty(&task->run_list);
}
/*
- * Used by the migration code - we pull tasks from the head of the
- * remote queue so we want these tasks to show up at the head of the
- * local queue:
+ * Adding/removing a task to/from a runqueue:
*/
-static inline void enqueue_task_head(struct task_struct *p, prio_array_t *array)
+static void dequeue_task(struct task_struct *p, runqueue_t *rq)
+{
+ list_del_init(&p->run_list);
+ if (list_empty(rq->queue + p->prio))
+ __clear_bit(p->prio, rq->bitmap);
+}
+
+static void enqueue_task(struct task_struct *p, runqueue_t *rq)
{
- list_add(&p->run_list, array->queue + p->prio);
- __set_bit(p->prio, array->bitmap);
- array->nr_active++;
- p->array = array;
+ list_add_tail(&p->run_list, rq->queue + p->prio);
+ __set_bit(p->prio, rq->bitmap);
}
/*
- * effective_prio - return the priority that is based on the static
- * priority but is modified by bonuses/penalties.
- *
- * We scale the actual sleep average [0 .... MAX_SLEEP_AVG]
- * into the -5 ... 0 ... +5 bonus/penalty range.
- *
- * We use 25% of the full 0...39 priority range so that:
- *
- * 1) nice +19 interactive tasks do not preempt nice 0 CPU hogs.
- * 2) nice -20 CPU hogs do not get preempted by nice 0 tasks.
- *
- * Both properties are important to certain workloads.
+ * Used by the migration code - we pull tasks from the head of the
+ * remote queue so we want these tasks to show up at the head of the
+ * local queue:
*/
-static int effective_prio(task_t *p)
+static inline void enqueue_task_head(struct task_struct *p, runqueue_t *rq)
{
- int bonus, prio;
-
- if (rt_task(p))
- return p->prio;
-
- bonus = CURRENT_BONUS(p) - MAX_BONUS / 2;
-
- prio = p->static_prio - bonus;
- if (prio < MAX_RT_PRIO)
- prio = MAX_RT_PRIO;
- if (prio > MAX_PRIO-1)
- prio = MAX_PRIO-1;
- return prio;
+ list_add(&p->run_list, rq->queue + p->prio);
+ __set_bit(p->prio, rq->bitmap);
}
/*
@@ -471,7 +341,7 @@ static int effective_prio(task_t *p)
*/
static inline void __activate_task(task_t *p, runqueue_t *rq)
{
- enqueue_task(p, rq->active);
+ enqueue_task(p, rq);
rq->nr_running++;
}
@@ -480,95 +350,107 @@ static inline void __activate_task(task_
*/
static inline void __activate_idle_task(task_t *p, runqueue_t *rq)
{
- enqueue_task_head(p, rq->active);
+ enqueue_task_head(p, rq);
rq->nr_running++;
}
-static void recalc_task_prio(task_t *p, unsigned long long now)
+// burst - extra intervals an interactive task can run for at best priority
+static unsigned int burst(task_t *p)
{
- unsigned long long __sleep_time = now - p->timestamp;
- unsigned long sleep_time;
-
- if (__sleep_time > NS_MAX_SLEEP_AVG)
- sleep_time = NS_MAX_SLEEP_AVG;
+ unsigned int task_user_prio;
+ if (rt_task(p))
+ return p->burst;
+ task_user_prio = TASK_USER_PRIO(p);
+ if (likely(task_user_prio < 40))
+ return 39 - task_user_prio;
else
- sleep_time = (unsigned long)__sleep_time;
+ return 0;
+}
- if (likely(sleep_time > 0)) {
- /*
- * User tasks that sleep a long time are categorised as
- * idle and will get just interactive status to stay active &
- * prevent them suddenly becoming cpu hogs and starving
- * other processes.
- */
- if (p->mm && p->activated != -1 &&
- sleep_time > INTERACTIVE_SLEEP(p)) {
- p->sleep_avg = JIFFIES_TO_NS(MAX_SLEEP_AVG -
- AVG_TIMESLICE);
- if (!HIGH_CREDIT(p))
- p->interactive_credit++;
- } else {
- /*
- * The lower the sleep avg a task has the more
- * rapidly it will rise with sleep time.
- */
- sleep_time *= (MAX_BONUS - CURRENT_BONUS(p)) ? : 1;
+static void inc_burst(task_t *p)
+{
+ unsigned int best_burst;
+ best_burst = burst(p);
+ if (p->burst < best_burst)
+ p->burst++;
+}
- /*
- * Tasks with low interactive_credit are limited to
- * one timeslice worth of sleep avg bonus.
- */
- if (LOW_CREDIT(p) &&
- sleep_time > JIFFIES_TO_NS(task_timeslice(p)))
- sleep_time = JIFFIES_TO_NS(task_timeslice(p));
+static void dec_burst(task_t *p)
+{
+ if (p->burst)
+ p->burst--;
+}
- /*
- * Non high_credit tasks waking from uninterruptible
- * sleep are limited in their sleep_avg rise as they
- * are likely to be cpu hogs waiting on I/O
- */
- if (p->activated == -1 && !HIGH_CREDIT(p) && p->mm) {
- if (p->sleep_avg >= INTERACTIVE_SLEEP(p))
- sleep_time = 0;
- else if (p->sleep_avg + sleep_time >=
- INTERACTIVE_SLEEP(p)) {
- p->sleep_avg = INTERACTIVE_SLEEP(p);
- sleep_time = 0;
- }
- }
+// slice - the duration a task runs before losing burst
+static unsigned int slice(task_t *p)
+{
+ unsigned int slice = RR_INTERVAL;
+ if (!rt_task(p))
+ slice += burst(p) * RR_INTERVAL;
+ return slice;
+}
- /*
- * This code gives a bonus to interactive tasks.
- *
- * The boost works by updating the 'average sleep time'
- * value here, based on ->timestamp. The more time a
- * task spends sleeping, the higher the average gets -
- * and the higher the priority boost gets as well.
- */
- p->sleep_avg += sleep_time;
+// interactive - interactive tasks get longer intervals at best priority
+int interactive = 1;
- if (p->sleep_avg > NS_MAX_SLEEP_AVG) {
- p->sleep_avg = NS_MAX_SLEEP_AVG;
- if (!HIGH_CREDIT(p))
- p->interactive_credit++;
- }
+/*
+ * effective_prio - dynamic priority dependent on burst.
+ * The priority normally decreases by one each RR_INTERVAL.
+ * As the burst increases the priority stays at the top "stair" or
+ * priority for longer.
+ */
+static int effective_prio(task_t *p)
+{
+ int prio;
+ unsigned int full_slice, used_slice, first_slice;
+ unsigned int best_burst;
+ if (rt_task(p))
+ return p->prio;
+
+ best_burst = burst(p);
+ full_slice = slice(p);
+ used_slice = full_slice - p->slice;
+ if (p->burst > best_burst)
+ p->burst = best_burst;
+ first_slice = RR_INTERVAL;
+ if (interactive && !compute)
+ first_slice *= (p->burst + 1);
+ prio = MAX_PRIO - 1 - best_burst;
+
+ if (used_slice < first_slice)
+ return prio;
+ prio += 1 + (used_slice - first_slice) / RR_INTERVAL;
+ if (prio > MAX_PRIO - 1)
+ prio = MAX_PRIO - 1;
+ return prio;
+}
+
+static void recalc_task_prio(task_t *p, unsigned long long now)
+{
+ unsigned long sleep_time = now - p->timestamp;
+ unsigned long run_time = NS_TO_JIFFIES(p->runtime);
+ unsigned long total_run = NS_TO_JIFFIES(p->totalrun) + run_time;
+ if (!run_time && NS_TO_JIFFIES(p->runtime + sleep_time) < RR_INTERVAL) {
+ if (p->slice - total_run < 1) {
+ p->totalrun = 0;
+ dec_burst(p);
+ } else {
+ p->totalrun += p->runtime;
+ p->slice -= NS_TO_JIFFIES(p->totalrun);
}
+ } else {
+ inc_burst(p);
+ p->runtime = 0;
+ p->totalrun = 0;
}
-
- p->prio = effective_prio(p);
}
/*
* activate_task - move a task to the runqueue and do priority recalculation
- *
- * Update all the scheduling statistics stuff. (sleep average
- * calculation, priority modifiers, etc.)
*/
static void activate_task(task_t *p, runqueue_t *rq, int local)
{
- unsigned long long now;
-
- now = sched_clock();
+ unsigned long long now = sched_clock();
#ifdef CONFIG_SMP
if (!local) {
/* Compensate for drifting sched_clock */
@@ -577,33 +459,11 @@ static void activate_task(task_t *p, run
+ rq->timestamp_last_tick;
}
#endif
-
+ p->slice = slice(p);
recalc_task_prio(p, now);
-
- /*
- * This checks to make sure it's not an uninterruptible task
- * that is now waking up.
- */
- if (!p->activated) {
- /*
- * Tasks which were woken up by interrupts (ie. hw events)
- * are most likely of interactive nature. So we give them
- * the credit of extending their sleep time to the period
- * of time they spend on the runqueue, waiting for execution
- * on a CPU, first time around:
- */
- if (in_interrupt())
- p->activated = 2;
- else {
- /*
- * Normal first-time wakeups get a credit too for
- * on-runqueue time, but it will be weighted down:
- */
- p->activated = 1;
- }
- }
+ p->prio = effective_prio(p);
+ p->time_slice = RR_INTERVAL;
p->timestamp = now;
-
__activate_task(p, rq);
}
@@ -615,8 +475,7 @@ static void deactivate_task(struct task_
rq->nr_running--;
if (p->state == TASK_UNINTERRUPTIBLE)
rq->nr_uninterruptible++;
- dequeue_task(p, p->array);
- p->array = NULL;
+ dequeue_task(p, rq);
}
/*
@@ -689,7 +548,7 @@ static int migrate_task(task_t *p, int d
* If the task is not on a runqueue (and not running), then
* it is sufficient to simply update the task's cpu field.
*/
- if (!p->array && !task_running(rq, p)) {
+ if (!task_queued(p) && !task_running(rq, p)) {
set_task_cpu(p, dest_cpu);
return 0;
}
@@ -720,7 +579,7 @@ void wait_task_inactive(task_t * p)
repeat:
rq = task_rq_lock(p, &flags);
/* Must be off runqueue entirely, not preempted. */
- if (unlikely(p->array)) {
+ if (unlikely(task_queued(p))) {
/* If it's preempted, we yield. It could be a while. */
preempted = !task_running(rq, p);
task_rq_unlock(rq, &flags);
@@ -849,7 +708,7 @@ static int try_to_wake_up(task_t * p, un
if (!(old_state & state))
goto out;
- if (p->array)
+ if (task_queued(p))
goto out_running;
cpu = task_cpu(p);
@@ -943,7 +802,7 @@ out_set_cpu:
old_state = p->state;
if (!(old_state & state))
goto out;
- if (p->array)
+ if (task_queued(p))
goto out_running;
this_cpu = smp_processor_id();
@@ -952,14 +811,8 @@ out_set_cpu:
out_activate:
#endif /* CONFIG_SMP */
- if (old_state == TASK_UNINTERRUPTIBLE) {
+ if (old_state == TASK_UNINTERRUPTIBLE)
rq->nr_uninterruptible--;
- /*
- * Tasks on involuntary sleep don't earn
- * sleep_avg beyond just interactive state.
- */
- p->activated = -1;
- }
/*
* Sync wakeups (i.e. those types of wakeups where the waker
@@ -971,7 +824,7 @@ out_activate:
*/
activate_task(p, rq, cpu == this_cpu);
if (!sync || cpu != this_cpu) {
- if (TASK_PREEMPTS_CURR(p, rq))
+ if (task_preempts_curr(p, rq))
resched_task(rq->curr);
}
success = 1;
@@ -1011,7 +864,6 @@ void fastcall sched_fork(task_t *p)
*/
p->state = TASK_RUNNING;
INIT_LIST_HEAD(&p->run_list);
- p->array = NULL;
spin_lock_init(&p->switch_lock);
#ifdef CONFIG_PREEMPT
/*
@@ -1022,33 +874,6 @@ void fastcall sched_fork(task_t *p)
*/
p->thread_info->preempt_count = 1;
#endif
- /*
- * Share the timeslice between parent and child, thus the
- * total amount of pending timeslices in the system doesn't change,
- * resulting in more scheduling fairness.
- */
- local_irq_disable();
- p->time_slice = (current->time_slice + 1) >> 1;
- /*
- * The remainder of the first timeslice might be recovered by
- * the parent if the child exits early enough.
- */
- p->first_time_slice = 1;
- current->time_slice >>= 1;
- p->timestamp = sched_clock();
- if (!current->time_slice) {
- /*
- * This case is rare, it happens when the parent has only
- * a single jiffy left from its timeslice. Taking the
- * runqueue lock is not a problem.
- */
- current->time_slice = 1;
- preempt_disable();
- scheduler_tick(0, 0);
- local_irq_enable();
- preempt_enable();
- } else
- local_irq_enable();
}
/*
@@ -1062,66 +887,13 @@ void fastcall wake_up_forked_process(tas
unsigned long flags;
runqueue_t *rq = task_rq_lock(current, &flags);
+ // Forked process gets no burst to prevent fork bombs.
+ p->burst = 0;
BUG_ON(p->state != TASK_RUNNING);
- /*
- * We decrease the sleep average of forking parents
- * and children as well, to keep max-interactive tasks
- * from forking tasks that are max-interactive.
- */
- current->sleep_avg = JIFFIES_TO_NS(CURRENT_BONUS(current) *
- PARENT_PENALTY / 100 * MAX_SLEEP_AVG / MAX_BONUS);
-
- p->sleep_avg = JIFFIES_TO_NS(CURRENT_BONUS(p) *
- CHILD_PENALTY / 100 * MAX_SLEEP_AVG / MAX_BONUS);
-
- p->interactive_credit = 0;
-
- p->prio = effective_prio(p);
set_task_cpu(p, smp_processor_id());
- if (unlikely(!current->array))
- __activate_task(p, rq);
- else {
- p->prio = current->prio;
- list_add_tail(&p->run_list, ¤t->run_list);
- p->array = current->array;
- p->array->nr_active++;
- rq->nr_running++;
- }
- task_rq_unlock(rq, &flags);
-}
-
-/*
- * Potentially available exiting-child timeslices are
- * retrieved here - this way the parent does not get
- * penalized for creating too many threads.
- *
- * (this cannot be used to 'generate' timeslices
- * artificially, because any timeslice recovered here
- * was given away by the parent in the first place.)
- */
-void fastcall sched_exit(task_t * p)
-{
- unsigned long flags;
- runqueue_t *rq;
-
- local_irq_save(flags);
- if (p->first_time_slice) {
- p->parent->time_slice += p->time_slice;
- if (unlikely(p->parent->time_slice > MAX_TIMESLICE))
- p->parent->time_slice = MAX_TIMESLICE;
- }
- local_irq_restore(flags);
- /*
- * If the child was a (relative-) CPU hog then decrease
- * the sleep_avg of the parent as well.
- */
- rq = task_rq_lock(p->parent, &flags);
- if (p->sleep_avg < p->parent->sleep_avg)
- p->parent->sleep_avg = p->parent->sleep_avg /
- (EXIT_WEIGHT + 1) * EXIT_WEIGHT + p->sleep_avg /
- (EXIT_WEIGHT + 1);
+ __activate_task(p, rq);
task_rq_unlock(rq, &flags);
}
@@ -1385,30 +1157,16 @@ lock_again:
double_rq_unlock(this_rq, rq);
goto lock_again;
}
- /*
- * We decrease the sleep average of forking parents
- * and children as well, to keep max-interactive tasks
- * from forking tasks that are max-interactive.
- */
- current->sleep_avg = JIFFIES_TO_NS(CURRENT_BONUS(current) *
- PARENT_PENALTY / 100 * MAX_SLEEP_AVG / MAX_BONUS);
-
- p->sleep_avg = JIFFIES_TO_NS(CURRENT_BONUS(p) *
- CHILD_PENALTY / 100 * MAX_SLEEP_AVG / MAX_BONUS);
-
- p->interactive_credit = 0;
p->prio = effective_prio(p);
set_task_cpu(p, cpu);
if (cpu == this_cpu) {
- if (unlikely(!current->array))
+ if (unlikely(!task_queued(current)))
__activate_task(p, rq);
else {
p->prio = current->prio;
list_add_tail(&p->run_list, ¤t->run_list);
- p->array = current->array;
- p->array->nr_active++;
rq->nr_running++;
}
} else {
@@ -1417,7 +1175,7 @@ lock_again:
p->timestamp = (p->timestamp - this_rq->timestamp_last_tick)
+ rq->timestamp_last_tick;
__activate_task(p, rq);
- if (TASK_PREEMPTS_CURR(p, rq))
+ if (task_preempts_curr(p, rq))
resched_task(rq->curr);
}
@@ -1511,22 +1269,22 @@ static void double_lock_balance(runqueue
* pull_task - move a task from a remote runqueue to the local runqueue.
* Both runqueues must be locked.
*/
-static inline
-void pull_task(runqueue_t *src_rq, prio_array_t *src_array, task_t *p,
- runqueue_t *this_rq, prio_array_t *this_array, int this_cpu)
+static inline
+void pull_task(runqueue_t *src_rq, task_t *p,
+ runqueue_t *this_rq, int this_cpu)
{
- dequeue_task(p, src_array);
+ dequeue_task(p, src_rq);
src_rq->nr_running--;
set_task_cpu(p, this_cpu);
this_rq->nr_running++;
- enqueue_task(p, this_array);
+ enqueue_task(p, this_rq);
p->timestamp = (p->timestamp - src_rq->timestamp_last_tick)
+ this_rq->timestamp_last_tick;
/*
* Note that idle threads have a prio of MAX_PRIO, for this test
* to be always true for them.
*/
- if (TASK_PREEMPTS_CURR(p, this_rq))
+ if (task_preempts_curr(p, this_rq))
resched_task(this_rq->curr);
}
@@ -1576,7 +1334,6 @@ static int move_tasks(runqueue_t *this_r
unsigned long max_nr_move, struct sched_domain *sd,
enum idle_type idle)
{
- prio_array_t *array, *dst_array;
struct list_head *head, *curr;
int idx, pulled = 0;
task_t *tmp;
@@ -1584,38 +1341,17 @@ static int move_tasks(runqueue_t *this_r
if (max_nr_move <= 0 || busiest->nr_running <= 1)
goto out;
- /*
- * We first consider expired tasks. Those will likely not be
- * executed in the near future, and they are most likely to
- * be cache-cold, thus switching CPUs has the least effect
- * on them.
- */
- if (busiest->expired->nr_active) {
- array = busiest->expired;
- dst_array = this_rq->expired;
- } else {
- array = busiest->active;
- dst_array = this_rq->active;
- }
-
-new_array:
/* Start searching at priority 0: */
idx = 0;
skip_bitmap:
if (!idx)
- idx = sched_find_first_bit(array->bitmap);
+ idx = sched_find_first_bit(busiest->bitmap);
else
- idx = find_next_bit(array->bitmap, MAX_PRIO, idx);
- if (idx >= MAX_PRIO) {
- if (array == busiest->expired && busiest->active->nr_active) {
- array = busiest->active;
- dst_array = this_rq->active;
- goto new_array;
- }
+ idx = find_next_bit(busiest->bitmap, MAX_PRIO, idx);
+ if (idx >= MAX_PRIO)
goto out;
- }
- head = array->queue + idx;
+ head = busiest->queue + idx;
curr = head->prev;
skip_queue:
tmp = list_entry(curr, task_t, run_list);
@@ -1628,7 +1364,7 @@ skip_queue:
idx++;
goto skip_bitmap;
}
- pull_task(busiest, array, tmp, this_rq, dst_array, this_cpu);
+ pull_task(busiest, tmp, this_rq, this_cpu);
pulled++;
/* We only want to steal up to the prescribed number of tasks. */
@@ -2120,22 +1856,6 @@ DEFINE_PER_CPU(struct kernel_stat, kstat
EXPORT_PER_CPU_SYMBOL(kstat);
/*
- * We place interactive tasks back into the active array, if possible.
- *
- * To guarantee that this does not starve expired tasks we ignore the
- * interactivity of a task if the first expired task had to wait more
- * than a 'reasonable' amount of time. This deadline timeout is
- * load-dependent, as the frequency of array switched decreases with
- * increasing number of running tasks. We also ignore the interactivity
- * if a better static_prio task has expired:
- */
-#define EXPIRED_STARVING(rq) \
- ((STARVATION_LIMIT && ((rq)->expired_timestamp && \
- (jiffies - (rq)->expired_timestamp >= \
- STARVATION_LIMIT * ((rq)->nr_running) + 1))) || \
- ((rq)->curr->static_prio > (rq)->best_expired_prio))
-
-/*
* This function gets called by the timer code, with HZ frequency.
* We call it with interrupts disabled.
*
@@ -2179,78 +1899,36 @@ void scheduler_tick(int user_ticks, int
cpustat->user += user_ticks;
cpustat->system += sys_ticks;
- /* Task might have expired already, but not scheduled off yet */
- if (p->array != rq->active) {
+ spin_lock(&rq->lock);
+ // SCHED_FIFO tasks never run out of timeslice.
+ if (unlikely(p->policy == SCHED_FIFO))
+ goto out_unlock;
+ rq->cache_ticks++;
+ // Tasks lose burst each time they use up a full slice().
+ if (!--p->slice) {
set_tsk_need_resched(p);
- goto out;
+ dequeue_task(p, rq);
+ dec_burst(p);
+ p->slice = slice(p);
+ p->prio = effective_prio(p);
+ p->time_slice = RR_INTERVAL;
+ enqueue_task(p, rq);
+ goto out_unlock;
}
- spin_lock(&rq->lock);
/*
- * The task was running during this tick - update the
- * time slice counter. Note: we do not update a thread's
- * priority until it either goes to sleep or uses up its
- * timeslice. This makes it possible for interactive tasks
- * to use up their timeslices at their highest priority levels.
+ * Tasks that run out of time_slice but still have slice left get
+ * requeued with a lower priority && RR_INTERVAL time_slice.
*/
- if (unlikely(rt_task(p))) {
- /*
- * RR tasks need a special form of timeslice management.
- * FIFO tasks have no timeslices.
- */
- if ((p->policy == SCHED_RR) && !--p->time_slice) {
- p->time_slice = task_timeslice(p);
- p->first_time_slice = 0;
- set_tsk_need_resched(p);
-
- /* put it at the end of the queue: */
- dequeue_task(p, rq->active);
- enqueue_task(p, rq->active);
- }
- goto out_unlock;
- }
if (!--p->time_slice) {
- dequeue_task(p, rq->active);
set_tsk_need_resched(p);
+ dequeue_task(p, rq);
p->prio = effective_prio(p);
- p->time_slice = task_timeslice(p);
- p->first_time_slice = 0;
-
- if (!rq->expired_timestamp)
- rq->expired_timestamp = jiffies;
- if (!TASK_INTERACTIVE(p) || EXPIRED_STARVING(rq)) {
- enqueue_task(p, rq->expired);
- if (p->static_prio < rq->best_expired_prio)
- rq->best_expired_prio = p->static_prio;
- } else
- enqueue_task(p, rq->active);
- } else {
- /*
- * Prevent a too long timeslice allowing a task to monopolize
- * the CPU. We do this by splitting up the timeslice into
- * smaller pieces.
- *
- * Note: this does not mean the task's timeslices expire or
- * get lost in any way, they just might be preempted by
- * another task of equal priority. (one with higher
- * priority would have preempted this task already.) We
- * requeue this task to the end of the list on this priority
- * level, which is in essence a round-robin of tasks with
- * equal priority.
- *
- * This only applies to tasks in the interactive
- * delta range with at least TIMESLICE_GRANULARITY to requeue.
- */
- if (TASK_INTERACTIVE(p) && !((task_timeslice(p) -
- p->time_slice) % TIMESLICE_GRANULARITY(p)) &&
- (p->time_slice >= TIMESLICE_GRANULARITY(p)) &&
- (p->array == rq->active)) {
-
- dequeue_task(p, rq->active);
- set_tsk_need_resched(p);
- p->prio = effective_prio(p);
- enqueue_task(p, rq->active);
- }
+ p->time_slice = RR_INTERVAL;
+ enqueue_task(p, rq);
+ goto out_unlock;
}
+ if (rq->preempted && rq->cache_ticks >= cache_decay_ticks)
+ set_tsk_need_resched(p);
out_unlock:
spin_unlock(&rq->lock);
out:
@@ -2313,8 +1991,8 @@ static inline int dependent_sleeper(int
* task from using an unfair proportion of the
* physical cpu's resources. -ck
*/
- if (((smt_curr->time_slice * (100 - sd->per_cpu_gain) / 100) >
- task_timeslice(p) || rt_task(smt_curr)) &&
+ if (((smt_curr->slice * (100 - sd->per_cpu_gain) / 100) >
+ slice(p) || rt_task(smt_curr)) &&
p->mm && smt_curr->mm && !rt_task(p))
ret = 1;
@@ -2323,8 +2001,8 @@ static inline int dependent_sleeper(int
* or wake it up if it has been put to sleep for priority
* reasons.
*/
- if ((((p->time_slice * (100 - sd->per_cpu_gain) / 100) >
- task_timeslice(smt_curr) || rt_task(p)) &&
+ if ((((p->slice * (100 - sd->per_cpu_gain) / 100) >
+ slice(smt_curr) || rt_task(p)) &&
smt_curr->mm && p->mm && !rt_task(smt_curr)) ||
(smt_curr == smt_rq->idle && smt_rq->nr_running))
resched_task(smt_curr);
@@ -2350,10 +2028,8 @@ asmlinkage void __sched schedule(void)
long *switch_count;
task_t *prev, *next;
runqueue_t *rq;
- prio_array_t *array;
struct list_head *queue;
unsigned long long now;
- unsigned long run_time;
int cpu, idx;
/*
@@ -2376,19 +2052,8 @@ need_resched:
release_kernel_lock(prev);
schedstat_inc(rq, sched_cnt);
now = sched_clock();
- if (likely(now - prev->timestamp < NS_MAX_SLEEP_AVG))
- run_time = now - prev->timestamp;
- else
- run_time = NS_MAX_SLEEP_AVG;
-
- /*
- * Tasks with interactive credits get charged less run_time
- * at high sleep_avg to delay them losing their interactive
- * status
- */
- if (HIGH_CREDIT(prev))
- run_time /= (CURRENT_BONUS(prev) ? : 1);
+ prev->runtime = now - prev->timestamp;
spin_lock_irq(&rq->lock);
/*
@@ -2410,61 +2075,26 @@ need_resched:
idle_balance(cpu, rq);
if (!rq->nr_running) {
next = rq->idle;
- rq->expired_timestamp = 0;
wake_sleeping_dependent(cpu, rq);
schedstat_inc(rq, sched_idle);
goto switch_tasks;
}
}
-
- array = rq->active;
- if (unlikely(!array->nr_active)) {
- /*
- * Switch the active and expired arrays.
- */
- schedstat_inc(rq, sched_switch);
- rq->active = rq->expired;
- rq->expired = array;
- array = rq->active;
- rq->expired_timestamp = 0;
- rq->best_expired_prio = MAX_PRIO;
- }
-
- idx = sched_find_first_bit(array->bitmap);
- queue = array->queue + idx;
+ idx = sched_find_first_bit(rq->bitmap);
+ queue = rq->queue + idx;
next = list_entry(queue->next, task_t, run_list);
- if (dependent_sleeper(cpu, rq, next)) {
+ if (dependent_sleeper(cpu, rq, next))
next = rq->idle;
- goto switch_tasks;
- }
-
- if (!rt_task(next) && next->activated > 0) {
- unsigned long long delta = now - next->timestamp;
-
- if (next->activated == 1)
- delta = delta * (ON_RUNQUEUE_WEIGHT * 128 / 100) / 128;
-
- array = next->array;
- dequeue_task(next, array);
- recalc_task_prio(next, next->timestamp + delta);
- enqueue_task(next, array);
- }
- next->activated = 0;
switch_tasks:
prefetch(next);
clear_tsk_need_resched(prev);
RCU_qsctr(task_cpu(prev))++;
-
- prev->sleep_avg -= run_time;
- if ((long)prev->sleep_avg <= 0) {
- prev->sleep_avg = 0;
- if (!(HIGH_CREDIT(prev) || LOW_CREDIT(prev)))
- prev->interactive_credit--;
- }
prev->timestamp = now;
if (likely(prev != next)) {
+ rq->preempted = 0;
+ rq->cache_ticks = 0;
next->timestamp = now;
rq->nr_switches++;
rq->curr = next;
@@ -2727,9 +2357,8 @@ EXPORT_SYMBOL(sleep_on_timeout);
void set_user_nice(task_t *p, long nice)
{
unsigned long flags;
- prio_array_t *array;
runqueue_t *rq;
- int old_prio, new_prio, delta;
+ int queued, old_prio, new_prio, delta;
if (TASK_NICE(p) == nice || nice < -20 || nice > 19)
return;
@@ -2748,9 +2377,8 @@ void set_user_nice(task_t *p, long nice)
p->static_prio = NICE_TO_PRIO(nice);
goto out_unlock;
}
- array = p->array;
- if (array)
- dequeue_task(p, array);
+ if ((queued = task_queued(p)))
+ dequeue_task(p, rq);
old_prio = p->prio;
new_prio = NICE_TO_PRIO(nice);
@@ -2758,8 +2386,8 @@ void set_user_nice(task_t *p, long nice)
p->static_prio = NICE_TO_PRIO(nice);
p->prio += delta;
- if (array) {
- enqueue_task(p, array);
+ if (queued) {
+ enqueue_task(p, rq);
/*
* If the task increased its priority or is running and
* lowered its priority, then reschedule its CPU:
@@ -2871,7 +2499,7 @@ static inline task_t *find_process_by_pi
/* Actually do priority change: must hold rq lock. */
static void __setscheduler(struct task_struct *p, int policy, int prio)
{
- BUG_ON(p->array);
+ BUG_ON(task_queued(p));
p->policy = policy;
p->rt_priority = prio;
if (policy != SCHED_NORMAL)
@@ -2887,8 +2515,7 @@ static int setscheduler(pid_t pid, int p
{
struct sched_param lp;
int retval = -EINVAL;
- int oldprio;
- prio_array_t *array;
+ int queued, oldprio;
unsigned long flags;
runqueue_t *rq;
task_t *p;
@@ -2948,13 +2575,12 @@ static int setscheduler(pid_t pid, int p
if (retval)
goto out_unlock;
- array = p->array;
- if (array)
+ if ((queued = task_queued(p)))
deactivate_task(p, task_rq(p));
retval = 0;
oldprio = p->prio;
__setscheduler(p, policy, lp.sched_priority);
- if (array) {
+ if (queued) {
__activate_task(p, task_rq(p));
/*
* Reschedule if we are currently running on this runqueue and
@@ -2964,7 +2590,7 @@ static int setscheduler(pid_t pid, int p
if (task_running(rq, p)) {
if (p->prio > oldprio)
resched_task(rq->curr);
- } else if (TASK_PREEMPTS_CURR(p, rq))
+ } else if (task_preempts_curr(p, rq))
resched_task(rq->curr);
}
@@ -3172,30 +2798,20 @@ out_unlock:
/**
* sys_sched_yield - yield the current processor to other threads.
*
- * this function yields the current CPU by moving the calling thread
- * to the expired array. If there are no other threads running on this
* CPU then this function will return.
*/
asmlinkage long sys_sched_yield(void)
{
runqueue_t *rq = this_rq_lock();
- prio_array_t *array = current->array;
- prio_array_t *target = rq->expired;
-
- schedstat_inc(rq, yld_cnt);
- /*
- * We implement yielding by moving the task into the expired
- * queue.
- *
- * (special rule: RT tasks will just roundrobin in the active
- * array.)
- */
- if (unlikely(rt_task(current)))
- target = rq->active;
-
- dequeue_task(current, array);
- enqueue_task(current, target);
+ dequeue_task(current, rq);
+ current->slice = RR_INTERVAL;
+ current->time_slice = current->slice;
+ if (!rt_task(current))
+ current->prio = MAX_PRIO - 1;
+ inc_burst(current);
+ enqueue_task(current, rq);
+
/*
* Since we are going to call schedule() anyway, there's
* no need to preempt or enable interrupts:
@@ -3333,7 +2949,7 @@ long sys_sched_rr_get_interval(pid_t pid
goto out_unlock;
jiffies_to_timespec(p->policy & SCHED_FIFO ?
- 0 : task_timeslice(p), &t);
+ 0 : slice(p), &t);
read_unlock(&tasklist_lock);
retval = copy_to_user(interval, &t, sizeof(t)) ? -EFAULT : 0;
out_nounlock:
@@ -3451,9 +3067,9 @@ void __devinit init_idle(task_t *idle, i
idle_rq->curr = idle_rq->idle = idle;
deactivate_task(idle, rq);
- idle->array = NULL;
idle->prio = MAX_PRIO;
idle->state = TASK_RUNNING;
+ idle->burst = 0;
set_task_cpu(idle, cpu);
double_rq_unlock(idle_rq, rq);
set_tsk_need_resched(idle);
@@ -3565,7 +3181,7 @@ static void __migrate_task(struct task_s
goto out;
set_task_cpu(p, dest_cpu);
- if (p->array) {
+ if (task_queued(p)) {
/*
* Sync timestamp with rq_dest's before activating.
* The same thing could be achieved by doing this step
@@ -3576,7 +3192,7 @@ static void __migrate_task(struct task_s
+ rq_dest->timestamp_last_tick;
deactivate_task(p, rq_src);
activate_task(p, rq_dest, 0);
- if (TASK_PREEMPTS_CURR(p, rq_dest))
+ if (task_preempts_curr(p, rq_dest))
resched_task(rq_dest->curr);
}
@@ -4086,7 +3702,7 @@ int in_sched_functions(unsigned long add
void __init sched_init(void)
{
runqueue_t *rq;
- int i, j, k;
+ int i, j;
#ifdef CONFIG_SMP
/* Set up an initial dummy domain for early boot */
@@ -4106,13 +3722,11 @@ void __init sched_init(void)
#endif
for (i = 0; i < NR_CPUS; i++) {
- prio_array_t *array;
-
rq = cpu_rq(i);
spin_lock_init(&rq->lock);
- rq->active = rq->arrays;
- rq->expired = rq->arrays + 1;
- rq->best_expired_prio = MAX_PRIO;
+
+ rq->cache_ticks = 0;
+ rq->preempted = 0;
#ifdef CONFIG_SMP
rq->sd = &sched_domain_init;
@@ -4123,16 +3737,11 @@ void __init sched_init(void)
INIT_LIST_HEAD(&rq->migration_queue);
#endif
atomic_set(&rq->nr_iowait, 0);
-
- for (j = 0; j < 2; j++) {
- array = rq->arrays + j;
- for (k = 0; k < MAX_PRIO; k++) {
- INIT_LIST_HEAD(array->queue + k);
- __clear_bit(k, array->bitmap);
- }
- // delimiter for bitsearch
- __set_bit(MAX_PRIO, array->bitmap);
- }
+ for (j = 0; j <= MAX_PRIO; j++)
+ INIT_LIST_HEAD(&rq->queue[j]);
+ memset(rq->bitmap, 0, BITS_TO_LONGS(MAX_PRIO+1)*sizeof(long));
+ // delimiter for bitsearch
+ __set_bit(MAX_PRIO, rq->bitmap);
}
/*
* We have to do a little magic to get the first
diff -Naurp linux-2.6.7-mm1-no/kernel/sysctl.c linux-2.6.7-mm1/kernel/sysctl.c
--- linux-2.6.7-mm1-no/kernel/sysctl.c 2004-06-22 01:30:26.000000000 +0300
+++ linux-2.6.7-mm1/kernel/sysctl.c 2004-06-22 01:10:29.000000000 +0300
@@ -620,6 +620,22 @@ static ctl_table kern_table[] = {
.mode = 0444,
.proc_handler = &proc_dointvec,
},
+ {
+ .ctl_name = KERN_INTERACTIVE,
+ .procname = "interactive",
+ .data = &interactive,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = KERN_COMPUTE,
+ .procname = "compute",
+ .data = &compute,
+ .maxlen = sizeof (int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
{ .ctl_name = 0 }
};