[PATCH 2.6.12-rc6-mm1] add allowed CPUs check into find_idlest_{group|cpu}()

[M.Baris Demiray]

Hello Nick,
a new patch related with recent thread is appended.

I check for CPUs only, ie. not for intersection, in find_idlest_cpu()
since there should be one-to-one comparison when finding CPU. But I
take intersection of group's CPUs and current task's allowed CPUs in
find_allowed_group(). Comments?

o add allowed CPUs check into find_idlest_group() and find_idlest_cpu()
o change the header of find_idlest_cpu() to be able to access
  allowed CPUs of current task.

diffstat:
 sched.c |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

--- linux-2.6.12-rc6-mm1/kernel/sched.c.orig	2005-06-08
00:28:59.000000000 +0000
+++ linux-2.6.12-rc6-mm1/kernel/sched.c	2005-06-08 02:28:28.000000000 +0000
@@ -1039,8 +1039,11 @@
 		int local_group;
 		int i;

+		/* Loop over if group has no CPUs allowed */
+		if (!cpus_intersects(group->cpumask, p->cpus_allowed))
+			continue;
+
 		local_group = cpu_isset(this_cpu, group->cpumask);
-		/* XXX: put a cpus allowed check */

 		/* Tally up the load of all CPUs in the group */
 		avg_load = 0;
@@ -1076,13 +1079,17 @@
 /*
  * find_idlest_queue - find the idlest runqueue among the cpus in group.
  */
-static int find_idlest_cpu(struct sched_group *group, int this_cpu)
+static int find_idlest_cpu(struct sched_group *group, struct
task_struct *p,
+			   int this_cpu)
 {
 	unsigned long load, min_load = ULONG_MAX;
 	int idlest = -1;
 	int i;

 	for_each_cpu_mask(i, group->cpumask) {
+		if (!cpu_isset(i, p->cpus_allowed))
+			continue;
+
 		load = source_load(i, 0);

 		if (load < min_load || (load == min_load && i == this_cpu)) {
@@ -1124,7 +1131,7 @@
 		if (!group)
 			goto nextlevel;

-		new_cpu = find_idlest_cpu(group, cpu);
+		new_cpu = find_idlest_cpu(group, t, cpu);
 		if (new_cpu == -1 || new_cpu == cpu)
 			goto nextlevel;


--
"You have to understand, most of these people are not ready to be
unplugged. And many of them are no inert, so hopelessly dependent
on the system, that they will fight to protect it."
                                                        Morpheus

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