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sched: Simplify finding the lowest sched_domain

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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>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110407122942.134511046@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2011-04-07 14:09:48 +02:00 committed by Ingo Molnar
parent 1cf5190254
commit 21d42ccfd6
1 changed files with 13 additions and 10 deletions
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23
kernel/sched.c
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@ -6865,11 +6865,13 @@ 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,
@ -7104,6 +7106,8 @@ static void __free_domain_allocs(struct s_data *d, enum s_alloc what,
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:
@ -7124,10 +7128,15 @@ static enum s_alloc __visit_domain_allocation_hell(struct s_data *d,
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;
}
@ -7316,6 +7325,8 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
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);
@ -7363,15 +7374,7 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
/* 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);
}