On 08/01/2024 14:48, Vincent Guittot wrote: > 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. I guess this is related to the 'user space system pressure' (*) slide of your OSPM '23 talk. Where do you draw the line when it comes to time between (*) and the 'medium pace system pressure' (e.g. thermal and FREQ_QOS). IIRC, with (*) you want to rebuild the sched domains etc. > > [1] https://lore.kernel.org/lkml/20231211104855.558096-1-vincent.guittot@xxxxxxxxxx/ > > Change since v1: > - 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%)
