Commit da5a5522 authored by M.Baris Demiray's avatar M.Baris Demiray Committed by Linus Torvalds
Browse files

[PATCH] sched: make idlest_group/cpu cpus_allowed-aware 



Add relevant checks into find_idlest_group() and find_idlest_cpu() to make
them return only the groups that have allowed CPUs and allowed CPUs
respectively.

Signed-off-by: default avatarM.Baris Demiray <baris@labristeknoloji.com>
Signed-off-by: default avatarNick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent fc38ed75

kernel/sched.c

+13 −4
Original line number Diff line number Diff line
@@ -966,8 +966,11 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu) 
		int local_group;

		int i;



		/* Skip over this group if it has no CPUs allowed */

		if (!cpus_intersects(group->cpumask, p->cpus_allowed))

			goto nextgroup;



		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;
@@ -992,6 +995,7 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu) 
			min_load = avg_load;

			idlest = group;

		}

nextgroup:

		group = group->next;

	} while (group != sd->groups);
@@ -1003,13 +1007,18 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu) 
/*

 * 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)

{

	cpumask_t tmp;

	unsigned long load, min_load = ULONG_MAX;

	int idlest = -1;

	int i;



	for_each_cpu_mask(i, group->cpumask) {

	/* Traverse only the allowed CPUs */

	cpus_and(tmp, group->cpumask, p->cpus_allowed);



	for_each_cpu_mask(i, tmp) {

		load = source_load(i, 0);



		if (load < min_load || (load == min_load && i == this_cpu)) {
@@ -1052,7 +1061,7 @@ static int sched_balance_self(int cpu, int flag) 
		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;

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