[PATCH v6 0/8] CPUs capacity information for heterogeneous systems

From: Juri Lelli
Date: Tue Jul 19 2016 - 08:41:19 EST

Hi all,

version 6 of "CPUs capacity information for heterogeneous systems" patchset [1]
(please refer to previous postings to get some context).

A few changes from v5:

- rebase on top of mainline (4.7-rc6)
- documentation fixes
- kcalloc() for raw_capacity array
- pr_err() only for partial updates
- cpu_scale_mutex to protect sysfs interface

Patches high level description:

o 01/08 introduces documentation for the new optional DT binding
o [02-06]/08 add cpu-capacity attribute to TC2, Juno and Juno r2 DTs and
provide parsing of such information at boot time
o [07-08]/08 introduce sysfs attribute

In case you would like to test this out, I pushed a branch here:

git://linux-arm.org/linux-jl.git upstream/default_caps_v6

This branch contains additional patches, useful to better understand how CPU
capacity information is actually used by the scheduler.

These patches also form the basis for Morten/Dietmar's "Clean-ups and
asymmetric cpu capacity support" series [2] (and the EAS stack in general).


- Juri

[1] v1 - https://lkml.org/lkml/2015/11/23/391
v2 - https://lkml.org/lkml/2016/1/8/417
v3 - https://lkml.org/lkml/2016/2/3/405
v4 - https://lkml.org/lkml/2016/3/18/350
v5 - https://lkml.org/lkml/2016/6/15/291
[2] https://lkml.org/lkml/2016/6/22/614

Juri Lelli (8):
Documentation: arm: define DT cpu capacity-dmips-mhz bindings
arm: parse cpu capacity-dmips-mhz from DT
arm, dts: add TC2 cpu capacity-dmips-mhz information
arm64: parse cpu capacity-dmips-mhz from DT
arm64, dts: add Juno cpu capacity-dmips-mhz information
arm64, dts: add Juno r2 cpu capacity-dmips-mhz information
arm: add sysfs cpu_capacity attribute
arm64: add sysfs cpu_capacity attribute

.../devicetree/bindings/arm/cpu-capacity.txt | 236 +++++++++++++++++++++
Documentation/devicetree/bindings/arm/cpus.txt | 10 +
arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts | 5 +
arch/arm/kernel/topology.c | 218 ++++++++++++++++++-
arch/arm64/boot/dts/arm/juno-r2.dts | 6 +
arch/arm64/boot/dts/arm/juno.dts | 6 +
arch/arm64/kernel/topology.c | 218 +++++++++++++++++++
7 files changed, 698 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/arm/cpu-capacity.txt