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From: Peter Zijlstra <peterz@infradead.org>
To: mingo@kernel.org, lvenanci@redhat.com
Cc: lwang@redhat.com, riel@redhat.com, efault@gmx.de,
	tglx@linutronix.de, linux-kernel@vger.kernel.org,
	peterz@infradead.org
Subject: [PATCH 08/14] sched/topology: Move comment about asymmetric node setups
Date: Fri, 28 Apr 2017 15:20:06 +0200	[thread overview]
Message-ID: <20170428132502.749421763@infradead.org> (raw)
In-Reply-To: <20170428131958.893188882@infradead.org>

[-- Attachment #1: lauro_ramos_venancio-sched_topology-move_comment_about_asymmetric_node_setups.patch --]
[-- Type: text/plain, Size: 1750 bytes --]


Cc: lwang@redhat.com
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: riel@redhat.com
Signed-off-by: Lauro Ramos Venancio <lvenanci@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1492717903-5195-4-git-send-email-lvenanci@redhat.com
---
 kernel/sched/topology.c |   19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -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_
 
 		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;
 

  parent reply	other threads:[~2017-04-28 13:34 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-28 13:19 [PATCH 00/14] sched/topology fixes Peter Zijlstra
2017-04-28 13:19 ` [PATCH 01/14] sched/topology: Refactor function build_overlap_sched_groups() Peter Zijlstra
2017-04-28 13:20 ` [PATCH 02/14] sched,cpumask: Export for_each_cpu_wrap() Peter Zijlstra
2017-05-01 19:56   ` Rik van Riel
2017-04-28 13:20 ` [PATCH 03/14] sched/topology: Fix building of overlapping sched-groups Peter Zijlstra
2017-05-01 20:08   ` Rik van Riel
2017-04-28 13:20 ` [PATCH 04/14] sched/topology: Simplify build_overlap_sched_groups() Peter Zijlstra
2017-05-01 21:04   ` Rik van Riel
2017-04-28 13:20 ` [PATCH 05/14] sched/topology,debug: Print the group mask Peter Zijlstra
2017-05-01 21:13   ` Rik van Riel
2017-04-28 13:20 ` [PATCH 06/14] sched/topology,debug: Verify the first group matches the child domain Peter Zijlstra
2017-05-01 21:13   ` Rik van Riel
2017-05-02 14:52     ` Peter Zijlstra
2017-05-03 15:00       ` Rik van Riel
2017-04-28 13:20 ` [PATCH 07/14] sched/topology: Optimize build_group_mask() Peter Zijlstra
2017-05-02  0:57   ` Rik van Riel
2017-04-28 13:20 ` Peter Zijlstra [this message]
2017-05-02  1:08   ` [PATCH 08/14] sched/topology: Move comment about asymmetric node setups Rik van Riel
2017-04-28 13:20 ` [PATCH 09/14] sched/topology: Remove FORCE_SD_OVERLAP Peter Zijlstra
2017-05-02  1:09   ` Rik van Riel
2017-04-28 13:20 ` [PATCH 10/14] sched/topology: Fix overlapping sched_group_mask Peter Zijlstra
2017-04-28 13:20 ` [PATCH 11/14] sched/topology: Small cleanup Peter Zijlstra
2017-04-28 13:20 ` [PATCH 12/14] sched/topology,debug: Add sched_group_capacity debugging Peter Zijlstra
2017-04-28 13:20 ` [PATCH 13/14] sched/topology: Fix overlapping sched_group_capacity Peter Zijlstra
2017-04-28 13:20 ` [PATCH 14/14] sched/topology: Add a few comments Peter Zijlstra
2017-05-01  8:35   ` Peter Zijlstra
2017-04-28 13:53 ` [PATCH 00/14] sched/topology fixes Peter Zijlstra
2017-04-28 23:30   ` Lauro Venancio
2017-05-01  8:57     ` Peter Zijlstra
2017-05-02 14:43   ` Peter Zijlstra
2017-05-02 14:54     ` Lauro Venancio

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