| Message ID | 20240109164655.626085-1-vincent.guittot@linaro.org |
|---|---|
| Headers | show |
| Series | Rework system pressure interface to the scheduler | expand |
On 09-01-24, 17:46, Vincent Guittot wrote: > Provide to the scheduler a feedback about the temporary max available > capacity. Unlike arch_update_thermal_pressure, this doesn't need to be > filtered as the pressure will happen for dozens ms or more. > > Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> > --- > drivers/cpufreq/cpufreq.c | 36 ++++++++++++++++++++++++++++++++++++ > include/linux/cpufreq.h | 10 ++++++++++ > 2 files changed, 46 insertions(+) Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
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 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%)