| From: |
| Viresh Kumar <viresh.kumar-AT-linaro.org> |
| To: |
| Rafael Wysocki <rjw-AT-rjwysocki.net>, Ben Segall <bsegall-AT-google.com>, Catalin Marinas <catalin.marinas-AT-arm.com>, Daniel Bristot de Oliveira <bristot-AT-redhat.com>, Dietmar Eggemann <dietmar.eggemann-AT-arm.com>, Greg Kroah-Hartman <gregkh-AT-linuxfoundation.org>, Ingo Molnar <mingo-AT-redhat.com>, Juri Lelli <juri.lelli-AT-redhat.com>, Mel Gorman <mgorman-AT-suse.de>, Peter Zijlstra <peterz-AT-infradead.org>, "Rafael J. Wysocki" <rafael-AT-kernel.org>, Steven Rostedt <rostedt-AT-goodmis.org>, Sudeep Holla <sudeep.holla-AT-arm.com>, Vincent Guittot <vincent.guittot-AT-linaro.org>, Viresh Kumar <viresh.kumar-AT-linaro.org>, Will Deacon <will-AT-kernel.org> |
| Subject: |
| [PATCH V5 0/2] cpufreq: cppc: Add support for frequency invariance |
| Date: |
| Mon, 01 Mar 2021 12:21:16 +0530 |
| Message-ID: |
| <cover.1614580695.git.viresh.kumar@linaro.org> |
| Cc: |
| linux-pm-AT-vger.kernel.org, Ionela Voinescu <ionela.voinescu-AT-arm.com>, linux-acpi-AT-vger.kernel.org, linux-arm-kernel-AT-lists.infradead.org, linux-kernel-AT-vger.kernel.org |
| Archive-link: |
| Article |
Hello,
CPPC cpufreq driver is used for ARM servers and this patch series tries
to provide counter-based frequency invariance support for them in the
absence for architecture specific counters (like AMUs).
This is tested by:
- /me with some hacks on Hikey, as I didn't have access to the right
hardware.
- Vincent Guittot on ThunderX2, only initial testing done.
- Ionela Voinescu on Juno R2, though she tested a previous version of
this.
This is based of 5.12-rc1.
Changes since V4:
- Move some code to policy specific initialization for cppc driver.
- Initialize kthread specific stuff only once in cppc driver.
- Added a kerneldoc comment in cppc driver and improved changelog as
well.
Changes since V3:
- rebuild_sched_domains_energy() stuff moved from arm64 to drivers/base.
- Added Reviewed/Tested-by Ionela for the first patch.
- Remove unused max_freq field from structure in cppc driver.
- s/cppc_f_i/cppc_freq_inv.
- Fix an per-cpu access, there was a bug in earlier version.
- Create a single kthread which can run on any CPU and takes care of
work from all the CPUs.
- Do the whole FIE thing under a new CONFIG option for cppc driver.
- Few minor improvements.
Changes since V2:
- Not sending as an RFC anymore.
- Several renames, reordering of code in 1/2 based on Ionela's comments.
- Several rebase changes for 2/2.
- The freq_scale calculations are optimized a bit.
- Better overall commenting and commit logs.
Changes since V1:
- The interface for setting the callbacks is improved, so different
parts looking to provide their callbacks don't need to think about
each other.
- Moved to per-cpu storage for storing the callback related data, AMU
counters have higher priority with this.
--
viresh
Viresh Kumar (2):
topology: Allow multiple entities to provide sched_freq_tick()
callback
cpufreq: CPPC: Add support for frequency invariance
arch/arm64/include/asm/topology.h | 10 +-
arch/arm64/kernel/topology.c | 105 +++++--------
drivers/base/arch_topology.c | 85 ++++++++++-
drivers/cpufreq/Kconfig.arm | 9 ++
drivers/cpufreq/cppc_cpufreq.c | 244 ++++++++++++++++++++++++++++--
include/linux/arch_topology.h | 15 +-
kernel/sched/core.c | 1 +
7 files changed, 377 insertions(+), 92 deletions(-)
base-commit: fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8
--
2.25.0.rc1.19.g042ed3e048af
