[PATCH 0/5] Rework system pressure interface to the scheduler
Lukasz Luba
lukasz.luba at arm.com
Thu Dec 14 00:22:10 PST 2023
Hi Vincent,
I've been waiting for this feature, thanks!
On 12/12/23 14:27, 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.
>
> [1] https://lore.kernel.org/lkml/20231211104855.558096-1-vincent.guittot@linaro.org/
>
> Vincent Guittot (4):
> 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
>
> arch/arm/include/asm/topology.h | 6 +--
> arch/arm64/include/asm/topology.h | 6 +--
> drivers/base/arch_topology.c | 26 ++++-----
> drivers/cpufreq/cpufreq.c | 48 +++++++++++++++++
> 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 | 53 ++++++++++---------
> kernel/sched/pelt.c | 18 +++----
> kernel/sched/pelt.h | 16 +++---
> kernel/sched/sched.h | 4 +-
> 17 files changed, 152 insertions(+), 94 deletions(-)
> rename include/trace/events/{thermal_pressure.h => hw_pressure.h} (55%)
>
I would like to test it, but something worries me. Why there is 0/5 in
this subject and only 4 patches?
Could you tell me your base branch that I can apply this, please?
Regards,
Lukasz
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