Messages in this thread | | | From | Vincent Guittot <> | Subject | [PATCH v6 0/5] Rework system pressure interface to the scheduler | Date | Tue, 26 Mar 2024 10:16:11 +0100 |
| |
Following the consolidation and cleanup of CPU capacity in [1], this serie reworks how the scheduler gets the pressures on CPUs. We need to take into account all pressures applied by cpufreq on the compute capacity of a CPU for dozens of ms or more and not only cpufreq cooling device or HW mitigiations. We split the pressure applied on CPU's capacity in 2 parts: - one from cpufreq and freq_qos - one from HW high freq mitigiation.
The next step will be to add a dedicated interface for long standing capping of the CPU capacity (i.e. for seconds or more) like the scaling_max_freq of cpufreq sysfs. The latter is already taken into account by this serie but as a temporary pressure which is not always the best choice when we know that it will happen for seconds or more.
[1] https://lore.kernel.org/lkml/20231211104855.558096-1-vincent.guittot@linaro.org/
Change since v5: - Rebase to fix a conflict in include/linux/cpufreq.h - Add few more tested and reviewed tags
Change since v4: - Add READ_ONCE() in cpufreq_get_pressure() - Add ack and reviewed tags
Change since v3: - Fix uninitialized variables in cpufreq_update_pressure()
Change since v2: - Rework cpufreq_update_pressure()
Change since v1: - Use struct cpufreq_policy as parameter of cpufreq_update_pressure() - Fix typos and comments - Make sched_thermal_decay_shift boot param as deprecated
Vincent Guittot (5): cpufreq: Add a cpufreq pressure feedback for the scheduler sched: Take cpufreq feedback into account thermal/cpufreq: Remove arch_update_thermal_pressure() sched: Rename arch_update_thermal_pressure into arch_update_hw_pressure sched/pelt: Remove shift of thermal clock
.../admin-guide/kernel-parameters.txt | 1 + arch/arm/include/asm/topology.h | 6 +- arch/arm64/include/asm/topology.h | 6 +- drivers/base/arch_topology.c | 26 ++++---- drivers/cpufreq/cpufreq.c | 36 +++++++++++ drivers/cpufreq/qcom-cpufreq-hw.c | 4 +- drivers/thermal/cpufreq_cooling.c | 3 - include/linux/arch_topology.h | 8 +-- include/linux/cpufreq.h | 10 +++ include/linux/sched/topology.h | 8 +-- .../{thermal_pressure.h => hw_pressure.h} | 14 ++--- include/trace/events/sched.h | 2 +- init/Kconfig | 12 ++-- kernel/sched/core.c | 8 +-- kernel/sched/fair.c | 63 +++++++++---------- kernel/sched/pelt.c | 18 +++--- kernel/sched/pelt.h | 16 ++--- kernel/sched/sched.h | 22 +------ 18 files changed, 144 insertions(+), 119 deletions(-) rename include/trace/events/{thermal_pressure.h => hw_pressure.h} (55%)
-- 2.34.1
| |