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* [PATCH V6 0/4] cpufreq: cppc: Add support for frequency invariance
@ 2021-03-10  5:23 Viresh Kumar
  2021-03-10  5:23 ` [PATCH V6 1/4] arch_topology: Rename freq_scale as arch_freq_scale Viresh Kumar
                   ` (4 more replies)
  0 siblings, 5 replies; 12+ messages in thread
From: Viresh Kumar @ 2021-03-10  5:23 UTC (permalink / raw)
  To: Rafael Wysocki, Ben Segall, Catalin Marinas,
	Daniel Bristot de Oliveira, Dietmar Eggemann, Greg Kroah-Hartman,
	Ingo Molnar, Juri Lelli, Mel Gorman, Peter Zijlstra,
	Rafael J. Wysocki, Steven Rostedt, Sudeep Holla, Vincent Guittot,
	Viresh Kumar, Will Deacon
  Cc: linux-pm, Ionela Voinescu, linux-acpi, linux-arm-kernel, linux-kernel

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:
- Vincent Guittot on ThunderX2.
- Ionela Voinescu on Juno R2.
- /me with hacks on Hikey, as I don't have access to the right hardware.

This is based of 5.12-rc2. I will merge these via the arm-cpufreq tree
directly.

Changes since V5:
- New patch to rename freq_scale to arch_freq_scale (Will Deacon).
- Separate patch to export arch_freq_scale and helpers (Will Deacon).
- Some improvements in the last patch like commit log, moving more stuff
  to policy init, new fie_disabled flag, etc. (Ionela Voinescu).
- Added Reviewed/Acked/Tested-by tags.

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 (4):
  arch_topology: Rename freq_scale as arch_freq_scale
  arch_topology: Allow multiple entities to provide sched_freq_tick()
    callback
  arch_topology: Export arch_freq_scale and helpers
  cpufreq: CPPC: Add support for frequency invariance

 arch/arm64/include/asm/topology.h |  10 +-
 arch/arm64/kernel/topology.c      | 109 +++++--------
 drivers/base/arch_topology.c      |  89 ++++++++++-
 drivers/cpufreq/Kconfig.arm       |  10 ++
 drivers/cpufreq/cppc_cpufreq.c    | 245 ++++++++++++++++++++++++++++--
 include/linux/arch_topology.h     |  19 ++-
 kernel/sched/core.c               |   1 +
 7 files changed, 385 insertions(+), 98 deletions(-)


base-commit: a38fd8748464831584a19438cbb3082b5a2dab15
-- 
2.25.0.rc1.19.g042ed3e048af


^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2021-06-10  8:25 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-03-10  5:23 [PATCH V6 0/4] cpufreq: cppc: Add support for frequency invariance Viresh Kumar
2021-03-10  5:23 ` [PATCH V6 1/4] arch_topology: Rename freq_scale as arch_freq_scale Viresh Kumar
2021-04-19 12:33   ` Will Deacon
2021-03-10  5:23 ` [PATCH V6 2/4] arch_topology: Allow multiple entities to provide sched_freq_tick() callback Viresh Kumar
2021-03-10  5:23 ` [PATCH V6 3/4] arch_topology: Export arch_freq_scale and helpers Viresh Kumar
2021-03-12  5:05   ` Viresh Kumar
2021-03-10  5:23 ` [PATCH V6 4/4] cpufreq: CPPC: Add support for frequency invariance Viresh Kumar
2021-03-19 16:20   ` Rafael J. Wysocki
2021-03-22  3:24     ` Viresh Kumar
2021-06-09 15:46 ` [PATCH V6 0/4] cpufreq: cppc: " Qian Cai
2021-06-10  3:07   ` Qian Cai
2021-06-10  8:25   ` Viresh Kumar

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