[PATCH v6 17/21] arch_topology: Limit span of cpu_clustergroup_mask()
Sudeep Holla
sudeep.holla at arm.com
Mon Jul 4 03:16:01 PDT 2022
From: Ionela Voinescu <ionela.voinescu at arm.com>
Currently the cluster identifier is not set on DT based platforms.
The reset or default value is -1 for all the CPUs. Once we assign the
cluster identifier values correctly, the cluster_sibling mask will be
populated and returned by cpu_clustergroup_mask() to contribute in the
creation of the CLS scheduling domain level, if SCHED_CLUSTER is
enabled.
To avoid topologies that will result in questionable or incorrect
scheduling domains, impose restrictions regarding the span of clusters,
as presented to scheduling domains building code: cluster_sibling should
not span more or the same CPUs as cpu_coregroup_mask().
This is needed in order to obtain a strict separation between the MC and
CLS levels, and maintain the same domains for existing platforms in
the presence of CONFIG_SCHED_CLUSTER, where the new cluster information
is redundant and irrelevant for the scheduler.
While previously the scheduling domain builder code would have removed MC
as redundant and kept CLS if SCHED_CLUSTER was enabled and the
cpu_coregroup_mask() and cpu_clustergroup_mask() spanned the same CPUs,
now CLS will be removed and MC kept.
Cc: Darren Hart <darren at os.amperecomputing.com>
Acked-by: Vincent Guittot <vincent.guittot at linaro.org>
Tested-by: Ionela Voinescu <ionela.voinescu at arm.com>
Signed-off-by: Ionela Voinescu <ionela.voinescu at arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>
---
drivers/base/arch_topology.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index e384afb6cac7..591c1f8e15e2 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -686,6 +686,14 @@ const struct cpumask *cpu_coregroup_mask(int cpu)
const struct cpumask *cpu_clustergroup_mask(int cpu)
{
+ /*
+ * Forbid cpu_clustergroup_mask() to span more or the same CPUs as
+ * cpu_coregroup_mask().
+ */
+ if (cpumask_subset(cpu_coregroup_mask(cpu),
+ &cpu_topology[cpu].cluster_sibling))
+ return get_cpu_mask(cpu);
+
return &cpu_topology[cpu].cluster_sibling;
}
--
2.37.0
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