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sched/topology: Move comment about asymmetric node setups 

Signed-off-by: Lauro Ramos Venancio <lvenanci@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: lwang@redhat.com
Cc: riel@redhat.com
Link: http://lkml.kernel.org/r/1492717903-5195-4-git-send-email-lvenanci@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Lauro Ramos Venancio 2017-04-20 16:51:42 -03:00 committed by Ingo Molnar
parent f32d782e31
commit c20e1ea4b6
1 changed files with 10 additions and 9 deletions
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19
kernel/sched/topology.c
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@ -495,14 +495,6 @@ enum s_alloc {
/*
* Build an iteration mask that can exclude certain CPUs from the upwards
* domain traversal.
*
* Asymmetric node setups can result in situations where the domain tree is of
* unequal depth, make sure to skip domains that already cover the entire
* range.
*
* In that case build_sched_domains() will have terminated the iteration early
* and our sibling sd spans will be empty. Domains should always include the
* CPU they're built on, so check that.
*/
static void build_group_mask(struct sched_domain *sd, struct sched_group *sg)
{
@ -590,7 +582,16 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)
sibling = *per_cpu_ptr(sdd->sd, i);
/* See the comment near build_group_mask(). */
/*
* Asymmetric node setups can result in situations where the
* domain tree is of unequal depth, make sure to skip domains
* that already cover the entire range.
*
* In that case build_sched_domains() will have terminated the
* iteration early and our sibling sd spans will be empty.
* Domains should always include the CPU they're built on, so
* check that.
*/
if (!cpumask_test_cpu(i, sched_domain_span(sibling)))
continue;