sched: put back some stack hog changes that were undone in kernel/sched.c
Impact: prevents panic from stack overflow on numa-capable machines.
Some of the "removal of stack hogs" changes in kernel/sched.c by using
node_to_cpumask_ptr were undone by the early cpumask API updates, and
causes a panic due to stack overflow. This patch undoes those changes
by using cpumask_of_node() which returns a 'const struct cpumask *'.
In addition, cpu_coregoup_map is replaced with cpu_coregroup_mask further
reducing stack usage. (Both of these updates removed 9 FIXME's!)
Also:
Pick up some remaining changes from the old 'cpumask_t' functions to
the new 'struct cpumask *' functions.
Optimize memory traffic by allocating each percpu local_cpu_mask on the
same node as the referring cpu.
Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 833b6d4..954e1a8 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1383,7 +1383,8 @@
unsigned int i;
for_each_possible_cpu(i)
- alloc_cpumask_var(&per_cpu(local_cpu_mask, i), GFP_KERNEL);
+ alloc_cpumask_var_node(&per_cpu(local_cpu_mask, i),
+ GFP_KERNEL, cpu_to_node(i));
}
#endif /* CONFIG_SMP */
