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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-07-20 12:42:57 -0400
committerIngo Molnar <mingo@elte.hu>2011-07-20 12:54:33 -0400
commitd110235d2c331c4f79e0879f51104be79e17a469 (patch)
treed56bb05a1274f9e7c6a20467d2d04713c185e7ce /kernel/sched.c
parente3589f6c81e4764d32a25d2a2a0afe54fa344f5c (diff)
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: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Peter 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@twins Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 921adf6f6fad..14168c49a154 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7436,6 +7436,8 @@ static int build_sched_domains(const struct cpumask *cpu_map,
7436 sd = build_sched_domain(tl, &d, cpu_map, attr, sd, i); 7436 sd = build_sched_domain(tl, &d, cpu_map, attr, sd, i);
7437 if (tl->flags & SDTL_OVERLAP || sched_feat(FORCE_SD_OVERLAP)) 7437 if (tl->flags & SDTL_OVERLAP || sched_feat(FORCE_SD_OVERLAP))
7438 sd->flags |= SD_OVERLAP; 7438 sd->flags |= SD_OVERLAP;
7439 if (cpumask_equal(cpu_map, sched_domain_span(sd)))
7440 break;
7439 } 7441 }
7440 7442
7441 while (sd->child) 7443 while (sd->child)