Messages in this thread | | | From | Ionela Voinescu <> | Subject | [PATCH 0/3] arch_topology, ACPI: populate cpu capacity from CPPC | Date | Fri, 14 May 2021 10:53:36 +0100 |
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Hi all,
These are a few trivial patches to populate cpu capacity information using performance information from ACPI's CPPC.
I've tied this functionality to the existing function init_freq_invariance_cppc() called in acpi_cppc_processor_probe(). This function is renamed to a more generic arch_init_invariance_cppc().
The patches have been build tested on x86 and more thoroughly tested on Juno R2 (arm64), which uses the new functionality, with the following results:
root@ubuntu:~# dmesg | grep cpu_capacity [ 2.157494] init_cpu_capacity_cppc: CPU0 cpu_capacity=38300 (raw). [ 2.163699] init_cpu_capacity_cppc: CPU1 cpu_capacity=38300 (raw). [ 2.169899] init_cpu_capacity_cppc: CPU2 cpu_capacity=38300 (raw). [ 2.176098] init_cpu_capacity_cppc: CPU3 cpu_capacity=38300 (raw). [ 2.182296] init_cpu_capacity_cppc: CPU4 cpu_capacity=102400 (raw). [ 2.188581] init_cpu_capacity_cppc: CPU5 cpu_capacity=102400 (raw). [ 2.194867] cpu_capacity: capacity_scale=102400 [ 2.199409] cpu_capacity: CPU0 cpu_capacity=383 [ 2.203952] cpu_capacity: CPU1 cpu_capacity=383 [ 2.208495] cpu_capacity: CPU2 cpu_capacity=383 [ 2.213037] cpu_capacity: CPU3 cpu_capacity=383 [ 2.217580] cpu_capacity: CPU4 cpu_capacity=1024 [ 2.222209] cpu_capacity: CPU5 cpu_capacity=1024 [ 2.226886] init_cpu_capacity_cppc: cpu_capacity initialization done
root@ubuntu:~# tail -n +1 /sys/devices/system/cpu/cpu*/cpu_capacity ==> /sys/devices/system/cpu/cpu0/cpu_capacity <== 383 ==> /sys/devices/system/cpu/cpu1/cpu_capacity <== 383 ==> /sys/devices/system/cpu/cpu2/cpu_capacity <== 383 ==> /sys/devices/system/cpu/cpu3/cpu_capacity <== 383 ==> /sys/devices/system/cpu/cpu4/cpu_capacity <== 1024 ==> /sys/devices/system/cpu/cpu5/cpu_capacity <== 1024
All works as expected even if ACPI processor support is built as a module.
Patches are based on v5.13-rc1.
Let me know what you think!
Thanks, Ionela.
Ionela Voinescu (3): x86, ACPI: rename init_freq_invariance_cppc to arch_init_invariance_cppc arch_topology: obtain cpu capacity using information from CPPC arm64, topology: enable use of init_cpu_capacity_cppc()
arch/arm64/include/asm/topology.h | 4 ++++ arch/x86/include/asm/topology.h | 2 +- drivers/acpi/cppc_acpi.c | 6 ++--- drivers/base/arch_topology.c | 39 +++++++++++++++++++++++++++++++ include/linux/arch_topology.h | 4 ++++ 5 files changed, 51 insertions(+), 4 deletions(-)
-- 2.29.2.dirty
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