Commit d110235d authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar

sched: Avoid creating superfluous NUMA domains on non-NUMA systems

When creating sched_domains, stop when we've covered the entire
target span instead of continuing to create domains, only to
later find they're redundant and throw them away again.

This avoids single node systems from touching funny NUMA
sched_domain creation code and reduces the risks of the new
SD_OVERLAP code.
Requested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Anton Blanchard <anton@samba.org>
Cc: mahesh@linux.vnet.ibm.com
Cc: benh@kernel.crashing.org
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1311180177.29152.57.camel@twinsSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e3589f6c
...@@ -7436,6 +7436,8 @@ static int build_sched_domains(const struct cpumask *cpu_map, ...@@ -7436,6 +7436,8 @@ static int build_sched_domains(const struct cpumask *cpu_map,
sd = build_sched_domain(tl, &d, cpu_map, attr, sd, i); sd = build_sched_domain(tl, &d, cpu_map, attr, sd, i);
if (tl->flags & SDTL_OVERLAP || sched_feat(FORCE_SD_OVERLAP)) if (tl->flags & SDTL_OVERLAP || sched_feat(FORCE_SD_OVERLAP))
sd->flags |= SD_OVERLAP; sd->flags |= SD_OVERLAP;
if (cpumask_equal(cpu_map, sched_domain_span(sd)))
break;
} }
while (sd->child) while (sd->child)
......
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