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Subject[PATCH 07/23] sched: Simplify finding the lowest sched_domain
Instead of relying on knowing the build order and various CONFIG_
flags simply remember the bottom most sched_domain when we created the
domain hierarchy.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
include/asm-generic/percpu.h | 4 ++++
kernel/sched.c | 23 +++++++++++++----------
2 files changed, 17 insertions(+), 10 deletions(-)
Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -6841,11 +6841,13 @@ struct s_data {
cpumask_var_t nodemask;
cpumask_var_t send_covered;
cpumask_var_t tmpmask;
+ struct sched_domain ** __percpu sd;
struct root_domain *rd;
};

enum s_alloc {
sa_rootdomain,
+ sa_sd,
sa_tmpmask,
sa_send_covered,
sa_nodemask,
@@ -7080,6 +7082,8 @@ static void __free_domain_allocs(struct
switch (what) {
case sa_rootdomain:
free_rootdomain(d->rd); /* fall through */
+ case sa_sd:
+ free_percpu(d->sd); /* fall through */
case sa_tmpmask:
free_cpumask_var(d->tmpmask); /* fall through */
case sa_send_covered:
@@ -7100,10 +7104,15 @@ static enum s_alloc __visit_domain_alloc
return sa_nodemask;
if (!alloc_cpumask_var(&d->tmpmask, GFP_KERNEL))
return sa_send_covered;
+ d->sd = alloc_percpu(struct sched_domain *);
+ if (!d->sd) {
+ printk(KERN_WARNING "Cannot alloc per-cpu pointers\n");
+ return sa_tmpmask;
+ }
d->rd = alloc_rootdomain();
if (!d->rd) {
printk(KERN_WARNING "Cannot alloc root domain\n");
- return sa_tmpmask;
+ return sa_sd;
}
return sa_rootdomain;
}
@@ -7292,6 +7301,8 @@ static int __build_sched_domains(const s
sd = __build_mc_sched_domain(&d, cpu_map, attr, sd, i);
sd = __build_smt_sched_domain(&d, cpu_map, attr, sd, i);

+ *per_cpu_ptr(d.sd, i) = sd;
+
for (tmp = sd; tmp; tmp = tmp->parent) {
tmp->span_weight = cpumask_weight(sched_domain_span(tmp));
build_sched_groups(&d, tmp, cpu_map, i);
@@ -7339,15 +7350,7 @@ static int __build_sched_domains(const s

/* Attach the domains */
for_each_cpu(i, cpu_map) {
-#ifdef CONFIG_SCHED_SMT
- sd = &per_cpu(cpu_domains, i).sd;
-#elif defined(CONFIG_SCHED_MC)
- sd = &per_cpu(core_domains, i).sd;
-#elif defined(CONFIG_SCHED_BOOK)
- sd = &per_cpu(book_domains, i).sd;
-#else
- sd = &per_cpu(phys_domains, i).sd;
-#endif
+ sd = *per_cpu_ptr(d.sd, i);
cpu_attach_domain(sd, d.rd, i);
}




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