diff mbox series

[1/6] sched/topology: Propagate SMT flags when removing degenerate domain

Message ID 73cf0959eafa53c02e7ef6bf805d751d9190e55d.1683156492.git.tim.c.chen@linux.intel.com
State New
Headers
Series Enable Cluster Scheduling for x86 Hybrid CPUs |

Commit Message

Tim Chen May 4, 2023, 4:09 p.m. UTC 
  From: Tim C Chen <tim.c.chen@linux.intel.com>

When a degenerate cluster domain for core with SMT CPUs is removed,
the SD_SHARE_CPUCAPACITY flag in the local child sched group was not
propagated to the new parent.  We need this flag to properly determine
whether the local sched group is SMT.  Set the flag in the local
child sched group of the new parent sched domain.

Reviewed-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
---
 kernel/sched/topology.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 051aaf65c749..6d5628fcebcf 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -719,8 +719,13 @@  cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
 
 		if (sd_parent_degenerate(tmp, parent)) {
 			tmp->parent = parent->parent;
-			if (parent->parent)
+
+			if (parent->parent) {
 				parent->parent->child = tmp;
+				if (tmp->flags & SD_SHARE_CPUCAPACITY)
+					parent->parent->groups->flags |= SD_SHARE_CPUCAPACITY;
+			}
+
 			/*
 			 * Transfer SD_PREFER_SIBLING down in case of a
 			 * degenerate parent; the spans match for this