* A big.LITTLE MP integration tree has been created to help test the
various patchsets together and it is being used for the TC2
enablement. ARM is going to point all members to this tree instead of
hosting their own.
* (git://git.linaro.org/arm/big.LITTLE/mp.git)
* The ARM Landing Team delivered support for ARM TC2 tile for the
vexpress board. TC2 is a big.LITTLE core with 2 Cortex A15 and 3
Cortex a7 processors).
* The Linaro Power Management group delivered its first submissions of
big.LITTLE MP functionality
- improving hotplug and making it faster
- minimal unoptimised support for MP in ARM (patches accepted by
Russell, Vincent Guittot)
- add support to cpuidle for MP (Daniel Lezcano, patches in review)
- including minimal unoptimised support for MP in ARM,
- support to cpuidle.
- Asymetric ARM support patchset has been accepted upstream.
- Scripts to help emulate a b.L system in absence of HW
*
http://git.linaro.org/gitweb?p=people/rob_lee/asymm_cpu_emu.git;a=summary)
* Vincent Guitot has run some tests to measure the improvement of the
cpu plug duration with Tejun's patches. The results are available on
this link:
https://wiki.linaro.org/WorkingGroups/PowerManagement/Doc/Hotplug#Workqueue
Other items:
* Thomas Gleixner released v3 of his smpboot patchset that will be the
basis of getting rid of high-overhead per-CPU kthread creation. This
version fixes the UP build error, but introduced an CONFIG_PREEMPT=y
issue in softirq, which I am tracking down.
* Silas Boyd-Wickizer has prototyped a tool based on the Linux
kernel's "sparse" static analysis software to classify the 300+ uses
of for_each_online_cpu(), which will help us work out how to address
any needed changes required to allow CPU hotplug to get rid of
stop_machine().
* Paul McKenney's RCU changes to support CPU hotplug's getting rid of
__stop_machine() are now in -tip slated for 3.6. I do expect that
there are additional implicit RCU dependencies on __stop_machine(),
and will be continuing inspection efforts to track them down.
* A number of CPU-hotplug improvements from a number of contributors
are in -tip queued for 3.6 inclusion.
* Paul McKenney presented a work-in-progress poster session on the
CPU-hotplug efforts (co-authored by Thomas Gleixner and Vincent
Guittot) at ECRTS last week. Well received, particularly the
real-time aspects.
* Paul McKenney will be leading a Linux Plumbers Conference discussion
on this topic as part of Amit's and Vincent's Scheduler
microconference.
* Paul Turner released a new version of his entity load-tracking
patchset that Morten Rasmussen has been basing his scheduler changes
on.
--
David Zinman
Linaro Release Manager | Project Manager
Linaro.org | Open source software for ARM SoCs
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