Messages in this thread | | | From | Morten Rasmussen <> | Subject | [PATCH 0/4] sched/topology: Set SD_ASYM_CPUCAPACITY flag automatically | Date | Fri, 20 Jul 2018 14:32:30 +0100 |
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The SD_ASYM_CPUCAPACITY flag has been around for some time now with no code to actually set it. Android has carried patches to do this out-of-tree in the meantime. The flag is meant to indicate cpu capacity asymmetry and is set at the topology level where the sched_domain spans all available cpu capacity in the system, i.e. all core types are visible, for any cpu in the system.
The flag was merged as being a topology flag meaning that architecture had to provide the flag explicitly, however when mixed with cpusets splitting the system into multiple root_domains the flag can't be set without knowledge about the cpusets. Rather than exposing cpusets to architecture code this patch set moves the responsibility for setting the flag to generic topology code which is simpler and make the code architecture agnostic.
Morten Rasmussen (4): sched/topology: SD_ASYM_CPUCAPACITY flag detection drivers/base/arch_topology: Rebuild sched_domain hierarchy when capacities change arch/arm64: Rebuild sched_domain hierarchy when cpu capacity changes arch/arm: Rebuild sched_domain hierarchy when cpu capacity changes
arch/arm/include/asm/topology.h | 3 ++ arch/arm64/include/asm/topology.h | 3 ++ drivers/base/arch_topology.c | 26 +++++++++++++ include/linux/arch_topology.h | 1 + include/linux/sched/topology.h | 2 +- kernel/sched/topology.c | 81 ++++++++++++++++++++++++++++++++++++--- 6 files changed, 109 insertions(+), 7 deletions(-)
-- 2.7.4
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