linaro-dev May 2013

linaro-dev@lists.linaro.org

70 participants
66 discussions

big.LITTLE MP status Apr 30, 2013

by Serge Broslavsky

https://wiki.linaro.org/projects/big.LITTLE.MP Work Items for functional completion: https://wiki.linaro.org/projects/big.LITTLE.MP/WorkItems Roadmap Cards: Epic big.LITTLE MP card - http://cards.linaro.org/browse/CARD-190 Main Project page: https://launchpad.net/linaro-big-little-system Announcement ============= According to the TSC decision the IKS code is now made public: http://www.linaro.org/linaro-blog/2013/05/02/the-linaro-iks-code-now-public… Quote from the link above: "The core MCPM patches are queued for inclusion into the v3.10 mainline kernel. The MCPM backend for TC2 and the IKS patches will tentatively be submitted for v3.11." Development ============ Big.LITTLE MP is following a two-track development: 1. A Reference (stable) patchset: https://git.linaro.org/gitweb?p=arm/big.LITTLE/mp.git;a=shortlog;h=refs/hea… 2. And an upstream (work in progress) patchset: https://git.linaro.org/gitweb?p=arm/big.LITTLE/mp.git;a=shortlog;h=refs/hea… Both branches are now merged with linux-linaro branch. Automated benchmarking code is ready (reviewing), permissions to be added. - LAVA API is in production now - working on getting it used Blueprint Updates ------------------ * https://blueprints.launchpad.net/linaro-big-little-system/+spec/big-little-… No issues, moving forward * https://blueprints.launchpad.net/linaro-big-little-system/+spec/cpuidle-add… Postponed to the next month (May 2013). * https://blueprints.launchpad.net/linaro-big-little-system/+spec/small-task-… Two fix patches have been accepted. V4 sent to LKML. Started getting feedback. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/cpu-hot-plu… Moving forward as the crash has been resolved. Pass/Fail verdict needs to be added to cpu_hotplug_latency test script. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/sched-coope… Long-lasting BP (6+ month to get something), just starting QA == big.LITTLE MP LAVA Dashboard http://validation.linaro.org/lava-server/dashboard/image-reports/linaro-and… Testing (2013.04 release): sched_tests.git #Cases #Run Pass Fail Absolute pass rate Regression 20 19 19 0 100 % mpbasicsuite 14 10 10 0 100 % mpcoresuite 10 6 5 1 90 % mpextendedsuite 20 10 7 3 70 % mploadbalance 2 2 2 0 100 % http://lists.linaro.org/pipermail/linaro-dev/2013-April/015864.html Bugs: https://bugs.launchpad.net/linaro-big-little-system/+bugs?field.tag=bl-mp -- Best Regards, Serge Broslavsky <serge.broslavsky(a)linaro.org> Project Manager, Linaro M: +37129426328 IRC: ototo Skype: serge.broslavsky http://linaro.org | Open source software for ARM SoCs

12 years

RTSM terminal_0 cannot display with linux-system-foundation.axf of linux-3.8

by Wang Wei

Dear linaro members I want to build arm64 kernel according to the steps of HowTo/BuildArm64Kernel. Then i use Foundatin_v8 with args such as linux-system-foundation.axf,vexpress64-openembedded_lam-armv8_20130320-274.img. But RTSM terminal_0 cannot display. I tried my best to search for methods to solve it. But i cannot find a correct method to handle with it. I need some help. I tried to slove it as following: I have tried 3.7 kernel and used 3.9-rc even. But i cannot built kenel correctly. Because some files such as arm64/boot/dts/vexpress-v2p-aarch64.dts, vexpress-foundation-v8.dts,vexpress-v2m-rs1.dtsi,skeleton.dtsi and arm64/configs/vexpress_defconfig don’t exist in 3.7 kernel and 3.9-rc even. So i cannot complete building kernel. Also i cannot use boot wrapper to generate a linux-system-foundation.axf suitable for a Foundation model. Then I copied the above files from linaro-aarch64-linaro-aarch64-3.6-fdf0f30 to 3.7 kernel and 3.9-rc even. Though I got linux-system-foundation.axf, i used foundation_v8 with the new linux-system-foundation.axf and rootfs.img and RTSM terminal_0 cannot display. I don’t know which step I made mistake. So i need to ask for help to know how to build arm64 kernel of 3.7 kernel and 3.9-rc even and generate a linux-system-foundation.axf which can run on Foundation model. For example, i should how to write configuration files such as vexpress_defconfig,vexpress-foundation-v8.dts,vexpress-v2p-aarch64.dts and so on. These files such as vexpress-foundation-v8.dts,vexpress-v2p-aarch64.dts are used to do what? Why RTSM terminal_0 cannot display? Thanks Xiaoke Wu

12 years

kernel (WAS RTSM terminal_0 cannot display with linux-system-foundation.axf of linux-3.8)

by Jonathan Aquilina

Whats the advantage of working down stream instead, why not just work with the main line upstream and they commit their changes directly to upstream instead of having a linaro tree so to speak. -- Jonathan Aquilina

12 years

[PATCH] genirq: Add default affinity mask command line option

by Punit Agrawal

I am attaching a patch by Thomas Gleixner which adds a kernel command line parameter to set the defauilt IRQ affinity mask. Could you please integrate this in your tree for the next Linaro release? I've been using this patch for sometime now and it doesn't introduce any regressions. There is a possibility that this patch will make it upstream via the RT patches in the near future but in the meanwhile, we'd like to carry this patch as well. Cheers, Punit >From 52a7d44f58a262e166575abc57aa0bd3bfc8cfbb Mon Sep 17 00:00:00 2001 From: Thomas Gleixner <tglx(a)linutronix.de> Date: Fri, 25 May 2012 16:59:47 +0200 Subject: [PATCH] genirq: Add default affinity mask command line option If we isolate CPUs, then we don't want random device interrupts on them. Even w/o the user space irq balancer enabled we can end up with irqs on non boot cpus. Allow to restrict the default irq affinity mask. Signed-off-by: Thomas Gleixner <tglx(a)linutronix.de> --- Documentation/kernel-parameters.txt | 9 +++++++++ kernel/irq/irqdesc.c | 21 +++++++++++++++++++-- 2 files changed, 28 insertions(+), 2 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 7d82468..00fedab 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1164,6 +1164,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted. See comment before ip2_setup() in drivers/char/ip2/ip2base.c. + irqaffinity= [SMP] Set the default irq affinity mask + Format: + <cpu number>,...,<cpu number> + or + <cpu number>-<cpu number> + (must be a positive range in ascending order) + or a mixture + <cpu number>,...,<cpu number>-<cpu number> + irqfixup [HW] When an interrupt is not handled search all handlers for it. Intended to get systems with badly broken diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 192a302..473b2b6 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -23,10 +23,27 @@ static struct lock_class_key irq_desc_lock_class; #if defined(CONFIG_SMP) +static int __init irq_affinity_setup(char *str) +{ + zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT); + cpulist_parse(str, irq_default_affinity); + /* + * Set at least the boot cpu. We don't want to end up with + * bugreports caused by random comandline masks + */ + cpumask_set_cpu(smp_processor_id(), irq_default_affinity); + return 1; +} +__setup("irqaffinity=", irq_affinity_setup); + static void __init init_irq_default_affinity(void) { - alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT); - cpumask_setall(irq_default_affinity); +#ifdef CONFIG_CPUMASK_OFFSTACK + if (!irq_default_affinity) + zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT); +#endif + if (cpumask_empty(irq_default_affinity)) + cpumask_setall(irq_default_affinity); } #else static void __init init_irq_default_affinity(void) -- 1.7.9.5

12 years

Test Result Summary of Calendar Week 18, 2013 for Linux Linaro ubuntu Quantal.

by Botao Sun

Calendar Week 18, 2013: Here is test result summary for Linux Linaro ubuntu Quantal image on following boards: 1) ARM Versatile Express A9; 2) Samsung Arndale; 3) TI Panda 4430; 4) TI Panda 4460; 5) ST Ericsson Snowball. Synopsis: Due to Bug 1174198, all tests have been blocked this week ( https://bugs.launchpad.net/linaro-ubuntu/+bug/1174198). 1. ARM Versatile Express A9 + Linux Linaro Quantal (Column T): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdFNmV… N/A. 2. Samsung Arndale + Linux Linaro Quantal (Column N): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AgB-fT5LL31CdGZJS… N/A. 3. TI Panda 4430 + Linux Linaro Quantal (Column T): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdEwwZ… N/A. 4. TI Panda 4460 + Linux Linaro Quantal (Column T): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdEwwZ… N/A. 5. ST Ericsson Snowball + Linux Linaro Quantal (Column U): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdFJ4X… N/A. For Linaro 13.04 release test summary (Calendar Week 17), please refer to attachment. Thank you. Best Regards Botao Sun

12 years

The Linaro IKS code now publicly available

by Nicolas Pitre

I'm delighted to announce that the Linaro Technical Steering Committee has approved the release of the big.LITTLE in-kernel switcher (IKS) code to the public. So here it is: Branch big.LITTLE-IKS-snapshot of git://git.linaro.org/landing-teams/working/arm/kernel.git Although this is a snapshot of our latest IKS code, it still needs some minor tidying before it is submitted upstream. So please consider the above as a temporary branch for people to look and play with, and not a branch that we'll keep stable and maintain. This code was also developed for and tested on the VExpress TC2 development platform. An MCPM backend and possibly a special cpufreq clock driver are required for this code to be usable on other platforms. The switcher concept is discussed here: http://lwn.net/Articles/481055/ Porting documentation is available here: https://wiki.linaro.org/projects/big.LITTLE.MP/Big.Little.Switcher/Docs/por… The switcher code description is available here (slightly out of date): https://wiki.linaro.org/projects/big.LITTLE.MP/Big.Little.Switcher/Docs/in-… And a review of the MCPM layer upon which IKS and HMP rely: http://lwn.net/Articles/539082/ The core MCPM patches are queued for inclusion into the v3.10 mainline kernel. The MCPM backend for TC2 and the IKS patches will tentatively be submitted for v3.11. Nicolas

12 years

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linaro-dev May 2013