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sched/doc: Update the CPU capacity asymmetry bits

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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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Link: https://lore.kernel.org/r/20210603140627.8409-4-beata.michalska@arm.com
This commit is contained in:
Beata Michalska 2021-06-03 15:06:27 +01:00 committed by Peter Zijlstra
parent c744dc4ab5
commit adf3c31e18
2 changed files with 5 additions and 3 deletions
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6
Documentation/scheduler/sched-capacity.rst
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@ -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

2
Documentation/scheduler/sched-energy.rst
View File

@ -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