hotplug cpu: migrate a task within its cpuset

When a cpu is disabled, move_task_off_dead_cpu() is called for tasks that have
been running on that cpu.

Currently, such a task is migrated:
 1) to any cpu on the same node as the disabled cpu, which is both online
    and among that task's cpus_allowed
 2) to any cpu which is both online and among that task's cpus_allowed

It is typical of a multithreaded application running on a large NUMA system to
have its tasks confined to a cpuset so as to cluster them near the memory that
they share.  Furthermore, it is typical to explicitly place such a task on a
specific cpu in that cpuset.  And in that case the task's cpus_allowed
includes only a single cpu.

This patch would insert a preference to migrate such a task to some cpu within
its cpuset (and set its cpus_allowed to its entire cpuset).

With this patch, migrate the task to:
 1) to any cpu on the same node as the disabled cpu, which is both online
    and among that task's cpus_allowed
 2) to any online cpu within the task's cpuset
 3) to any cpu which is both online and among that task's cpus_allowed

In order to do this, move_task_off_dead_cpu() must make a call to
cpuset_cpus_allowed_locked(), a new subset of cpuset_cpus_allowed(), that will
not block.  (name change - per Oleg's suggestion)

Calls are made to cpuset_lock() and cpuset_unlock() in migration_call() to set
the cpuset mutex during the whole migrate_live_tasks() and
migrate_dead_tasks() procedure.

[akpm@linux-foundation.org: build fix]
[pj@sgi.com: Fix indentation and spacing]
Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 25 insertions, 2 deletions

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index fa31cb9f9898..50f5dc463688 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1818,10 +1818,23 @@ cpumask_t cpuset_cpus_allowed(struct task_struct *tsk)
 	cpumask_t mask;
 
 	mutex_lock(&callback_mutex);
+	mask = cpuset_cpus_allowed_locked(tsk);
+	mutex_unlock(&callback_mutex);
+
+	return mask;
+}
+
+/**
+ * cpuset_cpus_allowed_locked - return cpus_allowed mask from a tasks cpuset.
+ * Must be  called with callback_mutex held.
+ **/
+cpumask_t cpuset_cpus_allowed_locked(struct task_struct *tsk)
+{
+	cpumask_t mask;
+
 	task_lock(tsk);
 	guarantee_online_cpus(task_cs(tsk), &mask);
 	task_unlock(tsk);
-	mutex_unlock(&callback_mutex);
 
 	return mask;
 }
diff --git a/kernel/sched.c b/kernel/sched.c
index a7e30462600f..4071306e1088 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5160,8 +5160,16 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
 
 		/* No more Mr. Nice Guy. */
 		if (dest_cpu == NR_CPUS) {
+			cpumask_t cpus_allowed = cpuset_cpus_allowed_locked(p);
+			/*
+			 * Try to stay on the same cpuset, where the
+			 * current cpuset may be a subset of all cpus.
+			 * The cpuset_cpus_allowed_locked() variant of
+			 * cpuset_cpus_allowed() will not block.  It must be
+			 * called within calls to cpuset_lock/cpuset_unlock.
+			 */
 			rq = task_rq_lock(p, &flags);
-			cpus_setall(p->cpus_allowed);
+			p->cpus_allowed = cpus_allowed;
 			dest_cpu = any_online_cpu(p->cpus_allowed);
 			task_rq_unlock(rq, &flags);
 
@@ -5527,6 +5535,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
 
 	case CPU_DEAD:
 	case CPU_DEAD_FROZEN:
+		cpuset_lock(); /* around calls to cpuset_cpus_allowed_lock() */
 		migrate_live_tasks(cpu);
 		rq = cpu_rq(cpu);
 		kthread_stop(rq->migration_thread);
@@ -5540,6 +5549,7 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
 		rq->idle->sched_class = &idle_sched_class;
 		migrate_dead_tasks(cpu);
 		spin_unlock_irq(&rq->lock);
+		cpuset_unlock();
 		migrate_nr_uninterruptible(rq);
 		BUG_ON(rq->nr_running != 0);