FROMLIST: sched/topology: Lowest CPU asymmetry sched_domain level pointer
Add another member to the family of per-cpu sched_domain shortcut pointers. This one, sd_asym_cpucapacity, points to the lowest level at which the SD_ASYM_CPUCAPACITY flag is set. While at it, rename the sd_asym shortcut to sd_asym_packing to avoid confusions. Generally speaking, the largest opportunity to save energy via scheduling comes from a smarter exploitation of heterogeneous platforms (i.e. big.LITTLE). Consequently, the sd_asym_cpucapacity shortcut will be used at first as the lowest domain where Energy-Aware Scheduling (EAS) should be applied. For example, it is possible to apply EAS within a socket on a multi-socket system, as long as each socket has an asymmetric topology. Energy-aware cross-sockets wake-up balancing can only happen if this_cpu and prev_cpu are in different sockets. Change-Id: Ie777a1733991d40ce063b318e915199ba3c5416a cc: Ingo Molnar <mingo@redhat.com> cc: Peter Zijlstra <peterz@infradead.org> Suggested-by:Morten Rasmussen <morten.rasmussen@arm.com> Signed-off-by:
Quentin Perret <quentin.perret@arm.com> Message-Id: <20181016101513.26919-7-quentin.perret@arm.com> Signed-off-by:
Quentin Perret <quentin.perret@arm.com>
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