sched/doc: Update the CPU capacity asymmetry bits
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
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@ -284,8 +284,10 @@ whether the system exhibits asymmetric CPU capacities. Should that be the
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case:
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- The sched_asym_cpucapacity static key will be enabled.
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- The SD_ASYM_CPUCAPACITY flag will be set at the lowest sched_domain level that
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spans all unique CPU capacity values.
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- The SD_ASYM_CPUCAPACITY_FULL flag will be set at the lowest sched_domain
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level that spans all unique CPU capacity values.
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- The SD_ASYM_CPUCAPACITY flag will be set for any sched_domain that spans
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CPUs with any range of asymmetry.
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The sched_asym_cpucapacity static key is intended to guard sections of code that
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cater to asymmetric CPU capacity systems. Do note however that said key is
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@ -328,7 +328,7 @@ section lists these dependencies and provides hints as to how they can be met.
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As mentioned in the introduction, EAS is only supported on platforms with
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asymmetric CPU topologies for now. This requirement is checked at run-time by
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looking for the presence of the SD_ASYM_CPUCAPACITY flag when the scheduling
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looking for the presence of the SD_ASYM_CPUCAPACITY_FULL flag when the scheduling
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domains are built.
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See Documentation/scheduler/sched-capacity.rst for requirements to be met for this
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