Messages in this thread | | | From | Qais Yousef <> | Subject | [PATCH 0/7] Fix relationship between uclamp and fits_capacity() | Date | Wed, 29 Jun 2022 20:46:25 +0100 |
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Relationship between uclamp and fits_capacity() is currently broken. Mostly due to how uclamp should interact with migration margin and capacity pressure. But also due not all users were converted to consider uclamp before calling fits_capacity(). Namely cpu_overutilized().
The meat of the series is patch 1 where we introduce a new function, util_fits_cpu(), that takes uclamp into account. The new function should replace all call sits to fits_capacity(), which what subsequent patches do. Except for patch 7 where we fix handling of early exit condition in find_energy_efficient_cpu(AKA feec()) that must be uclamp aware too.
util_fits_cpu() will revert back to a simple call to fits_capacity() if uclamp is not being used on the system.
Qais Yousef (7): sched/uclamp: Fix relationship between uclamp and migration margin sched/uclamp: Make task_fits_capacity() use util_fits_cpu() sched/uclamp: Fix fits_capacity() check in feec() sched/uclamp: Make select_idle_capacity() use util_fits_cpu() sched/uclamp: Make asym_fits_capacity() use util_fits_cpu() sched/uclamp: Make cpu_overutilized() use util_fits_cpu() sched/uclamp: Cater for uclamp in find_energy_efficient_cpu()'s early exit condition
kernel/sched/core.c | 10 +- kernel/sched/fair.c | 256 +++++++++++++++++++++++++++++++++------- kernel/sched/sched.h | 53 ++++++++- kernel/sched/topology.c | 18 +-- 4 files changed, 275 insertions(+), 62 deletions(-)
base-commit: 70fb5ccf2ebb09a0c8ebba775041567812d45f86 -- 2.25.1
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