Re: [PATCH] Staircase Scheduler v6.3 for 2.6.7-rc2

From: William Lee Irwin III
Date: Mon Jun 07 2004 - 10:03:17 EST

On Mon, Jun 07, 2004 at 07:04:45AM -0700, William Lee Irwin III wrote:
>> array->nr_active only ever modified, never examined.

On Mon, Jun 07, 2004 at 07:07:14AM -0700, William Lee Irwin III wrote:
> cpu_to_node_mask() is dead.

task->array is nothing more than a boolean flag. Shove it into
task->thread_info->flags, saving sizeof(prio_array_t *) from sizeof(task_t).
Compiletested only on sparc64 only.


Index: kolivas-2.6.7-rc2/include/asm-alpha/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-alpha/thread_info.h 2004-05-29 23:26:43.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-alpha/thread_info.h 2004-06-07 07:13:08.775700000 -0700
@@ -77,6 +77,7 @@
#define TIF_UAC_NOPRINT 6 /* see sysinfo.h */
#define TIF_UAC_NOFIX 7
#define TIF_UAC_SIGBUS 8
+#define TIF_QUEUED 9 /* queued for scheduling */

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
Index: kolivas-2.6.7-rc2/include/asm-arm/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-arm/thread_info.h 2004-05-29 23:26:10.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-arm/thread_info.h 2004-06-07 07:14:01.315712000 -0700
@@ -123,6 +123,7 @@
* TIF_NEED_RESCHED - rescheduling necessary
* TIF_USEDFPU - FPU was used by this task this quantum (SMP)
* TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
+ * TIF_QUEUED - true if on scheduler runqueue
*/
#define TIF_NOTIFY_RESUME 0
#define TIF_SIGPENDING 1
@@ -130,6 +131,7 @@
#define TIF_SYSCALL_TRACE 8
#define TIF_USED_FPU 16
#define TIF_POLLING_NRFLAG 17
+#define TIF_QUEUED 18

#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
Index: kolivas-2.6.7-rc2/include/asm-arm26/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-arm26/thread_info.h 2004-05-29 23:25:53.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-arm26/thread_info.h 2004-06-07 07:14:30.291307000 -0700
@@ -118,6 +118,7 @@
* TIF_NEED_RESCHED - rescheduling necessary
* TIF_USEDFPU - FPU was used by this task this quantum (SMP)
* TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
+ * TIF_QUEUED - true if on scheduler runqueue
*/
#define TIF_NOTIFY_RESUME 0
#define TIF_SIGPENDING 1
@@ -125,6 +126,7 @@
#define TIF_SYSCALL_TRACE 8
#define TIF_USED_FPU 16
#define TIF_POLLING_NRFLAG 17
+#define TIF_QUEUED 18

#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
Index: kolivas-2.6.7-rc2/include/asm-cris/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-cris/thread_info.h 2004-05-29 23:26:48.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-cris/thread_info.h 2004-06-07 07:14:57.512169000 -0700
@@ -85,6 +85,7 @@
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_QUEUED 17 /* true if on scheduler runqueue */

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
Index: kolivas-2.6.7-rc2/include/asm-h8300/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-h8300/thread_info.h 2004-05-29 23:26:03.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-h8300/thread_info.h 2004-06-07 07:16:00.653570000 -0700
@@ -93,6 +93,7 @@
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
+#define TIF_QUEUED 17 /* true if on scheduler runqueue */

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Index: kolivas-2.6.7-rc2/include/asm-i386/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-i386/thread_info.h 2004-05-29 23:25:45.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-i386/thread_info.h 2004-06-07 07:16:15.755274000 -0700
@@ -145,6 +145,7 @@
#define TIF_IRET 5 /* return with iret */
#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_QUEUED 17 /* true if on scheduler runqueue */

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
Index: kolivas-2.6.7-rc2/include/asm-ia64/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-ia64/thread_info.h 2004-05-29 23:26:49.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-ia64/thread_info.h 2004-06-07 07:16:53.195583000 -0700
@@ -74,6 +74,7 @@
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_QUEUED 17 /* true if on scheduler runqueue */

#define TIF_WORK_MASK 0x7 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE */
#define TIF_ALLWORK_MASK 0xf /* bits 0..3 are "work to do on user-return" bits */
Index: kolivas-2.6.7-rc2/include/asm-m68k/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-m68k/thread_info.h 2004-05-29 23:26:19.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-m68k/thread_info.h 2004-06-07 07:23:29.772294000 -0700
@@ -11,7 +11,7 @@
__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
__u32 cpu; /* should always be 0 on m68k */
struct restart_block restart_block;
-
+ unsigned char queued;
__u8 supervisor_stack[0];
};

@@ -48,6 +48,7 @@
#define TIF_NOTIFY_RESUME 2 /* resumption notification requested */
#define TIF_SIGPENDING 3 /* signal pending */
#define TIF_NEED_RESCHED 4 /* rescheduling necessary */
+#define TIF_QUEUED 5 /* true if on scheduler runqueue */

extern int thread_flag_fixme(void);

@@ -67,6 +68,9 @@
case TIF_SYSCALL_TRACE: \
tsk->thread.work.syscall_trace = val; \
break; \
+ case TIF_QUEUED: \
+ (tsk)->thread_info.queued = 1; \
+ break; \
default: \
thread_flag_fixme(); \
} \
@@ -84,6 +88,9 @@
case TIF_SYSCALL_TRACE: \
___res = tsk->thread.work.syscall_trace;\
break; \
+ case TIF_QUEUED: \
+ ___res = tsk->thread_info.queued; \
+ break; \
default: \
___res = thread_flag_fixme(); \
} \
Index: kolivas-2.6.7-rc2/include/asm-m68knommu/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-m68knommu/thread_info.h 2004-05-29 23:26:09.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-m68knommu/thread_info.h 2004-06-07 07:24:30.203107000 -0700
@@ -91,6 +91,7 @@
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
+#define TIF_QUEUED 16 /* true if on scheduler runqueue */

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Index: kolivas-2.6.7-rc2/include/asm-mips/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-mips/thread_info.h 2004-05-29 23:25:40.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-mips/thread_info.h 2004-06-07 07:25:03.044114000 -0700
@@ -113,6 +113,7 @@
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_QUEUED 18 /* true if on scheduler runqueue */
#define TIF_SYSCALL_TRACE 31 /* syscall trace active */

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Index: kolivas-2.6.7-rc2/include/asm-parisc/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-parisc/thread_info.h 2004-05-29 23:26:03.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-parisc/thread_info.h 2004-06-07 07:25:26.559539000 -0700
@@ -60,6 +60,7 @@
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_32BIT 5 /* 32 bit binary */
+#define TIF_QUEUED 6 /* true if on scheduler runqueue */

#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
Index: kolivas-2.6.7-rc2/include/asm-ppc/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-ppc/thread_info.h 2004-05-29 23:25:52.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-ppc/thread_info.h 2004-06-07 07:26:16.802901000 -0700
@@ -86,6 +86,7 @@
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
+#define TIF_QUEUED 5 /* true if on scheduler runqueue */
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
Index: kolivas-2.6.7-rc2/include/asm-ppc64/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-ppc64/thread_info.h 2004-05-29 23:25:45.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-ppc64/thread_info.h 2004-06-07 07:26:34.180260000 -0700
@@ -94,6 +94,7 @@
#define TIF_RUN_LIGHT 6 /* iSeries run light */
#define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */
#define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */
+#define TIF_QUEUED 9 /* true if on scheduler runqueue */

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Index: kolivas-2.6.7-rc2/include/asm-s390/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-s390/thread_info.h 2004-05-29 23:26:19.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-s390/thread_info.h 2004-06-07 07:27:50.350680000 -0700
@@ -89,6 +89,7 @@
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
#define TIF_31BIT 18 /* 32bit process */
+#define TIF_QUEUED 19 /* true if on scheduler runqueue */

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
Index: kolivas-2.6.7-rc2/include/asm-sh/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-sh/thread_info.h 2004-05-29 23:26:26.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-sh/thread_info.h 2004-06-07 07:28:08.307950000 -0700
@@ -93,6 +93,7 @@
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_QUEUED 18 /* true if on scheduler runqueue */
#define TIF_USERSPACE 31 /* true if FS sets userspace */

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Index: kolivas-2.6.7-rc2/include/asm-sparc/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-sparc/thread_info.h 2004-05-29 23:26:43.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-sparc/thread_info.h 2004-06-07 07:29:22.011745000 -0700
@@ -137,6 +137,7 @@
* this quantum (SMP) */
#define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling
* TIF_NEED_RESCHED */
+#define TIF_QUEUED 10 /* true if on scheduler runqueue */

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Index: kolivas-2.6.7-rc2/include/asm-sparc64/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-sparc64/thread_info.h 2004-05-29 23:26:26.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-sparc64/thread_info.h 2004-06-07 07:30:54.506684000 -0700
@@ -228,6 +228,7 @@
* an immediate value in instructions such as andcc.
*/
#define TIF_ABI_PENDING 12
+#define TIF_QUEUED 13 /* true if on scheduler runqueue */

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
Index: kolivas-2.6.7-rc2/include/asm-um/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-um/thread_info.h 2004-05-29 23:26:03.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-um/thread_info.h 2004-06-07 07:35:20.439256000 -0700
@@ -65,6 +65,7 @@
#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
* TIF_NEED_RESCHED
*/
+#define TIF_QUEUED 4 /* true if on scheduler runqueue */

#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
Index: kolivas-2.6.7-rc2/include/asm-v850/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-v850/thread_info.h 2004-05-29 23:26:03.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-v850/thread_info.h 2004-06-07 07:36:38.430400000 -0700
@@ -83,6 +83,7 @@
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
+#define TIF_QUEUED 5 /* true if on scheduler runqueue */

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Index: kolivas-2.6.7-rc2/include/asm-x86_64/thread_info.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/asm-x86_64/thread_info.h 2004-05-29 23:26:26.000000000 -0700
+++ kolivas-2.6.7-rc2/include/asm-x86_64/thread_info.h 2004-06-07 07:37:09.234717000 -0700
@@ -106,6 +106,7 @@
#define TIF_IA32 17 /* 32bit process */
#define TIF_FORK 18 /* ret_from_fork */
#define TIF_ABI_PENDING 19
+#define TIF_QUEUED 20 /* true if on scheduler runqueue */

#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
Index: kolivas-2.6.7-rc2/include/linux/sched.h
===================================================================
--- kolivas-2.6.7-rc2.orig/include/linux/sched.h 2004-06-07 06:19:45.891612000 -0700
+++ kolivas-2.6.7-rc2/include/linux/sched.h 2004-06-07 07:37:49.068661000 -0700
@@ -325,7 +325,6 @@
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;

@@ -392,8 +391,6 @@

int prio, static_prio;
struct list_head run_list;
- prio_array_t *array;
-
unsigned long long timestamp;
unsigned long runtime, totalrun;
unsigned int deadline;
Index: kolivas-2.6.7-rc2/kernel/sched.c
===================================================================
--- kolivas-2.6.7-rc2.orig/kernel/sched.c 2004-06-07 07:06:28.072616000 -0700
+++ kolivas-2.6.7-rc2/kernel/sched.c 2004-06-07 07:59:22.711997000 -0700
@@ -85,10 +85,10 @@

typedef struct runqueue runqueue_t;

-struct prio_array {
+typedef struct prio_array {
unsigned long bitmap[BITMAP_SIZE];
struct list_head queue[MAX_PRIO + 1];
-};
+} prio_array_t;

/*
* This is the main, per-CPU runqueue data structure.
@@ -191,6 +191,21 @@
spin_unlock_irq(&rq->lock);
}

+static inline int task_queued(task_t *task)
+{
+ return test_ti_thread_flag(task->thread_info, TIF_QUEUED);
+}
+
+static inline void set_task_queued(task_t *task)
+{
+ set_ti_thread_flag(task->thread_info, TIF_QUEUED);
+}
+
+static inline void clear_task_queued(task_t *task)
+{
+ clear_ti_thread_flag(task->thread_info, TIF_QUEUED);
+}
+
/*
* Adding/removing a task to/from a priority array:
*/
@@ -207,7 +222,7 @@
prio_array_t* array = &rq->array;
list_add_tail(&p->run_list, array->queue + p->prio);
__set_bit(p->prio, array->bitmap);
- p->array = array;
+ set_task_queued(p);
}

/*
@@ -220,7 +235,7 @@
prio_array_t* array = &rq->array;
list_add(&p->run_list, array->queue + p->prio);
__set_bit(p->prio, array->bitmap);
- p->array = array;
+ set_task_queued(p);
}

/*
@@ -369,7 +384,7 @@
p->deadline--;
}
dequeue_task(p, rq);
- p->array = NULL;
+ clear_task_queued(p);
}

/*
@@ -442,7 +457,7 @@
* 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;
}
@@ -473,7 +488,7 @@
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);
@@ -603,7 +618,7 @@
if (!(old_state & state))
goto out;

- if (p->array)
+ if (task_queued(p))
goto out_running;

cpu = task_cpu(p);
@@ -663,7 +678,7 @@
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();
@@ -725,7 +740,7 @@
*/
p->state = TASK_RUNNING;
INIT_LIST_HEAD(&p->run_list);
- p->array = NULL;
+ clear_task_queued(p);
spin_lock_init(&p->switch_lock);
#ifdef CONFIG_PREEMPT
/*
@@ -1079,12 +1094,12 @@
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, &current->run_list);
- p->array = current->array;
+ set_task_queued(p);
rq->nr_running++;
}
} else {
@@ -2232,9 +2247,8 @@
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;
@@ -2253,8 +2267,7 @@
p->static_prio = NICE_TO_PRIO(nice);
goto out_unlock;
}
- array = p->array;
- if (array)
+ if ((queued = task_queued(p)))
dequeue_task(p, rq);

old_prio = p->prio;
@@ -2263,7 +2276,7 @@
p->static_prio = NICE_TO_PRIO(nice);
p->prio += delta;

- if (array) {
+ if (queued) {
enqueue_task(p, rq);
/*
* If the task increased its priority or is running and
@@ -2369,7 +2382,7 @@
/* 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)
@@ -2385,8 +2398,7 @@
{
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;
@@ -2446,13 +2458,12 @@
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
@@ -2922,7 +2933,7 @@

idle_rq->curr = idle_rq->idle = idle;
deactivate_task(idle, rq);
- idle->array = NULL;
+ clear_task_queued(idle);
idle->prio = MAX_PRIO;
idle->state = TASK_RUNNING;
idle->deadline = 0;
@@ -3034,7 +3045,7 @@
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
-
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