[PATCH v5 3/3] sched/doc: Update the CPU capacity asymmetry bits

Beata Michalska
2021-05-24T10:17:03Z

Update the documentation bits referring to capacity aware scheduling
with regards to newly introduced SD_ASYM_CPUCAPACITY_FULL sched_domain
flag.

Signed-off-by: Beata Michalska <beata.michalska@arm.com>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
---
Documentation/scheduler/sched-capacity.rst | 6 ++++--
Documentation/scheduler/sched-energy.rst | 2 +-
2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/Documentation/scheduler/sched-capacity.rst b/Documentation/scheduler/sched-capacity.rst
index 9b7cbe43b2d1..805f85f330b5 100644
--- a/Documentation/scheduler/sched-capacity.rst
+++ b/Documentation/scheduler/sched-capacity.rst
@@ -284,8 +284,10 @@ whether the system exhibits asymmetric CPU capacities. Should that be the
case:

- The sched_asym_cpucapacity static key will be enabled.
-- The SD_ASYM_CPUCAPACITY flag will be set at the lowest sched_domain level that
- spans all unique CPU capacity values.
+- The SD_ASYM_CPUCAPACITY_FULL flag will be set at the lowest sched_domain
+ level that spans all unique CPU capacity values.
+- The SD_ASYM_CPUCAPACITY flag will be set for any sched_domain that spans
+ CPUs with any range of asymmetry.

The sched_asym_cpucapacity static key is intended to guard sections of code that
cater to asymmetric CPU capacity systems. Do note however that said key is
diff --git a/Documentation/scheduler/sched-energy.rst b/Documentation/scheduler/sched-energy.rst
index afe02d394402..8fbce5e767d9 100644
--- a/Documentation/scheduler/sched-energy.rst
+++ b/Documentation/scheduler/sched-energy.rst
@@ -328,7 +328,7 @@ section lists these dependencies and provides hints as to how they can be met.

As mentioned in the introduction, EAS is only supported on platforms with
asymmetric CPU topologies for now. This requirement is checked at run-time by
-looking for the presence of the SD_ASYM_CPUCAPACITY flag when the scheduling
+looking for the presence of the SD_ASYM_CPUCAPACITY_FULL flag when the scheduling
domains are built.

See Documentation/scheduler/sched-capacity.rst for requirements to be met for this
--
2.17.1