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sched: Simplify sched_groups_power initialization

Browse source 
Again, instead of relying on knowing the possible domains and their
order, simply rely on the sched_domain tree and whatever domains are
present in there to initialize the sched_group cpu_power.

Note: we need to iterate the CPU mask backwards because of the
cpumask_first() condition for iterating up the tree. By iterating the
mask backwards we ensure all groups of a domain are set-up before
starting on the parent groups that rely on its children to be
completely done.

Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Andrew Morton <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2011-04-07 14:09:49 +02:00 • committed by Ingo Molnar
commit a9c9a9b6bf
1 changed files with 5 additions and 34 deletions
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39
kernel/sched.c
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@ -7334,43 +7334,14 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
}
/* Calculate CPU power for physical packages and nodes */
#ifdef CONFIG_SCHED_SMT
for_each_cpu(i, cpu_map) {
sd = &per_cpu(cpu_domains, i).sd;
init_sched_groups_power(i, sd);
}
#endif
#ifdef CONFIG_SCHED_MC
for_each_cpu(i, cpu_map) {
sd = &per_cpu(core_domains, i).sd;
init_sched_groups_power(i, sd);
}
#endif
#ifdef CONFIG_SCHED_BOOK
for_each_cpu(i, cpu_map) {
sd = &per_cpu(book_domains, i).sd;
init_sched_groups_power(i, sd);
}
#endif
for (i = nr_cpumask_bits-1; i >= 0; i--) {
if (!cpumask_test_cpu(i, cpu_map))
continue;
for_each_cpu(i, cpu_map) {
sd = &per_cpu(phys_domains, i).sd;
init_sched_groups_power(i, sd);
}
#ifdef CONFIG_NUMA
for_each_cpu(i, cpu_map) {
sd = &per_cpu(node_domains, i).sd;
init_sched_groups_power(i, sd);
}
if (d.sd_allnodes) {
for_each_cpu(i, cpu_map) {
sd = &per_cpu(allnodes_domains, i).sd;
sd = *per_cpu_ptr(d.sd, i);
for (; sd; sd = sd->parent)
init_sched_groups_power(i, sd);
}
}
#endif
/* Attach the domains */
for_each_cpu(i, cpu_map) {