linaro-dev April 2013

linaro-dev@lists.linaro.org

51 participants
55 discussions

[PATCH V2 Resend 0/4] Create sched_select_cpu() and use it for workqueues and timers

by Viresh Kumar

Hi All, This is V2 Resend of my sched_select_cpu() work. Resend because didn't got much attention on V2. Including more guys now in cc :) In order to save power, it would be useful to schedule work onto non-IDLE cpus instead of waking up an IDLE one. To achieve this, we need scheduler to guide kernel frameworks (like: timers & workqueues) on which is the most preferred CPU that must be used for these tasks. This patchset is about implementing this concept. - The first patch adds sched_select_cpu() routine which returns the preferred cpu which is non-idle. - Second patch removes idle_cpu() calls from timer & hrtimer. - Third patch is about adapting this change in workqueue framework. - Fourth patch add migration capability in running timer Earlier discussions over v1 can be found here: http://www.mail-archive.com/linaro-dev@lists.linaro.org/msg13342.html Earlier discussions over this concept were done at last LPC: http://summit.linuxplumbersconf.org/lpc-2012/meeting/90/lpc2012-sched-timer… Module created for testing this behavior is present here: http://git.linaro.org/gitweb?p=people/vireshk/module.git;a=summary Following are the steps followed in test module: 1. Run single work on each cpu 2. This work will start a timer after x (tested with 10) jiffies of delay 3. Timer routine queues a work... (This may be called from idle or non-idle cpu) and starts the same timer again STEP 3 is done for n number of times (i.e. queuing n works, one after other) 4. All works will call a single routine, which will count following per cpu: - Total works processed by a CPU - Total works processed by a CPU, which are queued from it - Total works processed by a CPU, which aren't queued from it Setup: ----- - ARM Vexpress TC2 - big.LITTLE CPU - Core 0-1: A15, 2-4: A7 - rootfs: linaro-ubuntu-nano Results: ------- Without Workqueue Modification, i.e. PATCH 3/3: [ 2493.022335] Workqueue Analyser: works processsed by CPU0, Total: 1000, Own: 0, migrated: 0 [ 2493.047789] Workqueue Analyser: works processsed by CPU1, Total: 1000, Own: 0, migrated: 0 [ 2493.072918] Workqueue Analyser: works processsed by CPU2, Total: 1000, Own: 0, migrated: 0 [ 2493.098576] Workqueue Analyser: works processsed by CPU3, Total: 1000, Own: 0, migrated: 0 [ 2493.123702] Workqueue Analyser: works processsed by CPU4, Total: 1000, Own: 0, migrated: 0 With Workqueue Modification, i.e. PATCH 3/3: [ 2493.022335] Workqueue Analyser: works processsed by CPU0, Total: 1002, Own: 999, migrated: 3 [ 2493.047789] Workqueue Analyser: works processsed by CPU1, Total: 998, Own: 997, migrated: 1 [ 2493.072918] Workqueue Analyser: works processsed by CPU2, Total: 1013, Own: 996, migrated: 17 [ 2493.098576] Workqueue Analyser: works processsed by CPU3, Total: 998, Own: 993, migrated: 5 [ 2493.123702] Workqueue Analyser: works processsed by CPU4, Total: 989, Own: 987, migrated: 2 V2->V2-Resend ------------- - Included timer migration patch in the same thread. V1->V2 ----- - New SD_* macros removed now and earlier ones used - sched_select_cpu() rewritten and it includes the check on current cpu's idleness. - cpu_idle() calls from timer and hrtimer removed now. - Patch 2/3 from V1, removed as it doesn't apply to latest workqueue branch from tejun. - CONFIG_MIGRATE_WQ removed and so is wq_select_cpu() - sched_select_cpu() called only from __queue_work() - got tejun/for-3.7 branch in my tree, before making workqueue changes. Viresh Kumar (4): sched: Create sched_select_cpu() to give preferred CPU for power saving timer: hrtimer: Don't check idle_cpu() before calling get_nohz_timer_target() workqueue: Schedule work on non-idle cpu instead of current one timer: Migrate running timer include/linux/sched.h | 16 ++++++++++-- include/linux/timer.h | 2 ++ kernel/hrtimer.c | 2 +- kernel/sched/core.c | 69 +++++++++++++++++++++++++++++++-------------------- kernel/timer.c | 50 ++++++++++++++++++++++--------------- kernel/workqueue.c | 4 +-- 6 files changed, 91 insertions(+), 52 deletions(-) -- 1.7.12.rc2.18.g61b472e

11 years, 6 months

[Query]: Can people post to this mailing list without subscription?

by Viresh Kumar

Hi Guys, I really don't know whom to direct this mail to and hence the wide spread. Problem: When we send a mail to kernel mailing lists with linaro-dev or linaro-kernel in cc, and we get replies to those mails, sometimes the mails from outside people doesn't reach us back on linaro mailing lists. And i hope the reason behind that is those people aren't subscribed to these lists. For me it makes some sense to allow anyone to send mails to this list. Can that request be considered? I believe the idea behind blocking such use is for protecting against spam mails, but these mails/replies are really important and we certainly need them delivered to us. One solution (don't know if its possible) would be to monitor mails from non-subscribers and few people from Linaro can permit them on daily/hourly basis, so that we don't get any spam mails, but that would be a burden. -- viresh

11 years, 8 months

Repo for Managing Git Repositories

by Christopher Covington

Hi Marcin, I notice you've created a number of shell scripts to manage checking out multiple git repositories, specific revisions of git repositories for a release, etc. Repo [1] does this stuff pretty well that you might want to consider as an eventual alternative. 1. https://gerrit.googlesource.com/git-repo/+/stable Here's one example of a Repo manifest for an OpenEmbedded-based project, albeit with extra packages thrown in. You can ignore the things with a path outside of oe-core. https://www.codeaurora.org/gitweb/quic/le/?p=mdm/manifest.git;a=blob;f=caf_… Once you've got a git repository the with manifest file, the usage mechanics are something along the lines of downloading repo itself if not already available [2], passing the manifest repository's URL (can be local) to repo init, and then running repo sync to clone all the repositories from the source URLs to the destination paths at the revisions specified in the manifest file. 2. http://source.android.com/source/downloading.html Regards, Christopher -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by the Linux Foundation.

11 years, 11 months

[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

Linaro Release 13.04 Postmortem Summary

by David Zinman

Postmortem and lessons learned for Linaro's release 2013.04 https://wiki.linaro.org/Cycles/1304/Release/Review Highlights and Key Successes ============================ http://www.linaro.org/downloads/1304 http://wiki.linaro.org/Cycles/1304/Release#Release_Information Blueprints ========= The number of high or essential priority blueprints that missed the cycle: Android 1 out of 5 Developer Platform 2 out of 4 Infrastructure 3 out of 5 Lava 4 out of 12 QA 2 out of 7 Total 12 out of 33 36% of high or essential priority blueprints scheduled for this cycle were not delivered. Total blueprints: 23 out of 52 missed the cycle. High priority missed blueprints recap: 12.05: 19 out of 48, 39% 12.06: 13 out of 31, 42% 12.07: 14 out of 31, 45% 12.08: 6 out of 26, 23% 12.09: 9 out of 28, 32% 12.10: 15 out of 38, 39% 12.11: 7 out of 19, 37% 12.12: not available 13.01: 9 out of 28, 33% 13.02: 35 out of 69, 48% 13.03: 13 out of 29, 45% * Not included is data from working groups and landing teams Source: https://docs.google.com/spreadsheet/ccc?key=0AjEaTwrvj1bidFVXb2RMYm9FOTNQTk… -- David Zinman, Project Manager Linaro.org | Open source software for ARM SoCs

12 years

Suggestion

by Jonathan Aquilina

Have you guys considered gerrit code review for patches? as well as setting up build bots to test build the patches? -- Jonathan Aquilina

12 years

[ANN] snapshots.linaro.org migrated to Linaro Cloud

by Paul Sokolovsky

Hello, http://snapshots.linaro.org, server with interim downloads as produced by our Continuous Integration systems, has been migrated to Linaro EC2 Cloud, managed by our IT team. All data from the old server was migrated to the new one, and for a limited time, old server is available as http://archive.snapshots.linaro.org/ Let us know if you experience any issues with new server (please provide data required to reproduce the issue). -- Best Regards, Paul Linaro.org | Open source software for ARM SoCs Follow Linaro: http://www.facebook.com/pages/Linaro http://twitter.com/#!/linaroorg - http://www.linaro.org/linaro-blog

12 years

Failed To Build Version 13.04 from source

by dani maoz

Hi OS: Ubuntu 12.04 4 bit Board: Pandaboard Rev. B2 manifest download from https://releases.linaro.org/13.04/android/panda/ I have download the source using ./linaro_android_build_cmds.sh -t source-manifest.xml or ./linaro_android_build_cmds.sh -t Pinnded-mainfest but i get these errors when i try to compile the source target asm: libsimd <= external/jpeg/asm/armv7//jdcolor-armv7.S external/jpeg/asm/armv7//jdcolor-armv7.S: Assembler messages: external/jpeg/asm/armv7//jdcolor-armv7.S:160: Error: selected processor does not support ARM mode `vdup.s16 Q4,D7[1]' external/jpeg/asm/armv7//jdcolor-armv7.S:161: Error: selected processor does not support ARM mode `vdup.s16 Q5,D7[2]' external/jpeg/asm/armv7//jdcolor-armv7.S:166: Error: selected processor does not support ARM mode `vdup.s32 Q0,D30[0]' external/jpeg/asm/armv7//jdcolor-armv7.S:167: Error: selected processor does not support ARM mode `vdup.s32 Q1,D30[1]' external/jpeg/asm/armv7//jdcolor-armv7.S:168: Error: selected processor does not support ARM mode `vdup.s32 Q2,D31[0]' external/jpeg/asm/armv7//jdcolor-armv7.S:192: Error: selected processor does not support ARM mode `vmovl.u8 Q9,D12' external/jpeg/asm/armv7//jdcolor-armv7.S:193: Error: selected processor does not support ARM mode `vmovl.u8 Q10,D14' external/jpeg/asm/armv7//jdcolor-armv7.S:194: Error: selected processor does not support ARM mode `vmovl.u8 Q11,D15' external/jpeg/asm/armv7//jdcolor-armv7.S:199: Error: selected processor does not support ARM mode `vmull.s16 Q12,D20,D6[0]' [out/target/product/generic/obj/STATIC_LIBRARIES/libsimd_intermediates/asm/armv7//jdcolor-armv7.o] Error 1

12 years

how to build arm64 kernel which can be downloaded from www.kernel.org (此邮件代吴小科转发)

by zhanqing Zhan(Qing)

Dear linaro members Now, i have accomplished running the model following the steps of Linaro Engineering: ARMv8 activity: http://www.linaro.org/engineering/armv8#tab1<http://www.linaro.org/engineering/armv8>. So, 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 kernel cannot run correctly. The information is described as following. [cid:image001.png@01CE41D7.50059400] I also tried to create images and got sd.img. The result is also prompted above. The I tried to build kernel of linux-3.7rc1.Because some files of linux-3.6 don’t exist in linux-3.7rc1. So i copied the files of linux-3.6 to linux-3.7rc1 and completed the building. Then i use Foundation_v8 with the new linux-system-foundation.axf. The result was that Foundation model(RTSM) cannot run. Meanwhile i cannot find the source code of Foundation model. Now, i want to ask for help. For example: how to build arm64 kernel which can be downloaded from www.kernel.org(linux-3.8.tar.gz)<http://www.kernel.org(linux-3.8.tar.gz)/>, and let arm64 kernel can run on Foundation model. And where I can download the source code of Foundation model. I hope linaro members who know how to solve the troubles above sincerely. Thanks! Xiaoke Wu

12 years

big.LITTLE MP status Apr 23, 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 ============= As announced previously, I'm taking over this project and am replacing David Zinman, who is still keeping an eye on the project to ensure the smooth transition. 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. - Authentication is being added to the API. - Still having dependency on Android/LAVA teams. 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. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/small-task-… There is an idea of merging patches with Alex's ones. Discussion is ongoing (there are certain concerns). A lot of testing on big multicore systems is required - talking to IBM and Canonical to use their x86 big systems. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/cpu-hot-plu… kernel crash has been fixed, moving forward * https://blueprints.launchpad.net/linaro-big-little-system/+spec/document-bl… completed * 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: 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

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linaro-dev April 2013