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4332 discussions

by Dave Pigott

Hi All, Due to a glitch with UEFI and the latest kernels, we are forced to leave the TC2s offline until the issue is resolved. Ryan Harkin and I have been working to try and resolve this, but the best we could do is to get them to pass their health check (using sticking plaster, string and a large hammer) but they would then fail every test that was submitted to them, which would be kind of pointless. We're working actively to fix this problem, and I'll let you know when we're back up and running. Thanks, and apologies once again, Dave

13 years

Re: drivers/cpufreq/cpufreq_governor.c:46:53: sparse: incorrect type in argument 2 (different modifiers)

by Viresh Kumar

Hi Fengguang, Thanks for your mail. Few things i learnt from it: - Rafael has already applied my patches :) - I haven't used sparse in my life till this point. Now i know how to use it. On 23 October 2012 10:21, Fengguang Wu <fengguang.wu(a)intel.com> wrote: > Hi viresh, > > FYI, there are new sparse warnings show up in Actually these aren't new warnings, but old. Because some part is moved from one file to another, that's why your script shows them as new warnings. Anyway, i don't hesitate in fixing them. @Rafael: Most of these are due to mixed use of u64 and cputime64_t. Both of which are u64 if i am not wrong. Any specific reason that we used cputime64_t instead of u64? Or can i make everything u64 instead in governors? -- viresh > tree: git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next > head: 13f5e2d9a915373dd1573d8fe0214738bc69004f > commit: 83a73f712f2275033b2dc7f5c664988a1823ebc7 cpufreq: Move common part from governors to separate file, v2 > date: 5 hours ago > > + drivers/cpufreq/cpufreq_governor.c:46:53: sparse: incorrect type in argument 2 (different modifiers) > drivers/cpufreq/cpufreq_governor.c:46:53: expected unsigned long long [usertype] *wall > drivers/cpufreq/cpufreq_governor.c:46:53: got unsigned long long [nocast] [usertype] *wall > + drivers/cpufreq/cpufreq_governor.c:46:53: sparse: implicit cast from nocast type > drivers/cpufreq/cpufreq_governor.c:48:58: sparse: incorrect type in argument 2 (different modifiers) > drivers/cpufreq/cpufreq_governor.c:48:58: expected unsigned long long [usertype] *last_update_time > drivers/cpufreq/cpufreq_governor.c:48:58: got unsigned long long [nocast] [usertype] *wall > drivers/cpufreq/cpufreq_governor.c:48:58: sparse: implicit cast from nocast type > > vim +46 drivers/cpufreq/cpufreq_governor.c > > 83a73f71 viresh kumar 2012-10-23 30 busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ]; > 83a73f71 viresh kumar 2012-10-23 31 busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL]; > 83a73f71 viresh kumar 2012-10-23 32 busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE]; > 83a73f71 viresh kumar 2012-10-23 33 > 83a73f71 viresh kumar 2012-10-23 34 idle_time = cur_wall_time - busy_time; > 83a73f71 viresh kumar 2012-10-23 35 if (wall) > 83a73f71 viresh kumar 2012-10-23 36 *wall = jiffies_to_usecs(cur_wall_time); > 83a73f71 viresh kumar 2012-10-23 37 > 83a73f71 viresh kumar 2012-10-23 38 return jiffies_to_usecs(idle_time); > 83a73f71 viresh kumar 2012-10-23 39 } > 83a73f71 viresh kumar 2012-10-23 40 > 83a73f71 viresh kumar 2012-10-23 41 cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall) > 83a73f71 viresh kumar 2012-10-23 42 { > 83a73f71 viresh kumar 2012-10-23 43 u64 idle_time = get_cpu_idle_time_us(cpu, NULL); > 83a73f71 viresh kumar 2012-10-23 44 > 83a73f71 viresh kumar 2012-10-23 45 if (idle_time == -1ULL) > 83a73f71 viresh kumar 2012-10-23 @46 return get_cpu_idle_time_jiffy(cpu, wall); > 83a73f71 viresh kumar 2012-10-23 47 else > 83a73f71 viresh kumar 2012-10-23 48 idle_time += get_cpu_iowait_time_us(cpu, wall); > 83a73f71 viresh kumar 2012-10-23 49 > 83a73f71 viresh kumar 2012-10-23 50 return idle_time; > 83a73f71 viresh kumar 2012-10-23 51 } > 83a73f71 viresh kumar 2012-10-23 52 EXPORT_SYMBOL_GPL(get_cpu_idle_time); > > --- > 0-DAY kernel build testing backend Open Source Technology Center > Fengguang Wu, Yuanhan Liu Intel Corporation

13 years

[RFC PATCH 00/10] sched: Task placement for heterogeneous MP systems

by morten.rasmussen＠arm.com

From: Morten Rasmussen <morten.rasmussen(a)arm.com> Hi Paul, Paul, Peter, Suresh, linaro-sched-sig, and LKML, As a follow-up on my Linux Plumbers Conference talk about my experiments with scheduling on heterogeneous systems I'm posting a proof-of-concept patch set with my modifications. The intention behind the modifications is to tweak scheduling behaviour to only use fast (and power hungry) cores when it is necessary and also improve performance consistency. Without the modifications it is more or less random where tasks are scheduled and so is the execution time. I'm seeing good improvements on performance consistency for web browsing on Android using Bbench <http://www.gem5.org/Bbench> on the ARM big.LITTLE TC2 chip, which has two fast cores (Cortex-A15) and three power-efficient cores (Cortex-A7). The total execution time numbers below are for Androids SurfaceFlinger process is key for page rendering performance. The average execution time is lower with the patches enabled and the standard deviation is much smaller. Similar improvements can be seen for the Android.Browser and WebViewCoreThread processes. Total execution time statistics based on 50 runs. SurfaceFlinger SMP kernel [s] HMP modifications [s] ------------------------------------------------------ Average 14.617 11.012 St. Dev. 4.577 0.902 10% Pctl. 9.343 10.783 90% Pctl. 18.743 11.695 Unfortunately, I cannot share power-efficiency numbers at this stage. This patch set introduces proof-of-concept scheduler modifications which attempt to improve scheduling decisions on heterogeneous multi-processor systems (HMP) such as ARM big.LITTLE systems. The patch set relies on the entity load-tracking re-work patch set by Paul Turner: <https://lkml.org/lkml/2012/8/23/267> The modifications attempt to migrate tasks between cores with different compute capacity depending on the tracked load and priority. The aim is to only use fast cores for tasks which really need the extra performance and thereby improve power consumption by running everything else on the slow cores. The patch introduces hmp_domains to represent the different types of cores that are available on the given platform. Multiple (>2) hmp_domains is supported but not tested. hmp_domains must be set up by platform code and the patch set includes patches for ARM platforms using device-tree. The patches intentionally try to avoid modifying the existing code paths as much as possible. The aim is to experiment with HMP scheduling and get the overall policy right before integrating it properly with the existing load-balancer. Morten Morten Rasmussen (10): sched: entity load-tracking load_avg_ratio sched: Task placement for heterogeneous systems based on task load-tracking sched: Forced task migration on heterogeneous systems sched: Introduce priority-based task migration filter ARM: Add HMP scheduling support for ARM architecture ARM: sched: Use device-tree to provide fast/slow CPU list for HMP ARM: sched: Setup SCHED_HMP domains sched: Add ftrace events for entity load-tracking sched: Add HMP task migration ftrace event sched: SCHED_HMP multi-domain task migration control arch/arm/Kconfig | 46 +++++ arch/arm/include/asm/topology.h | 32 +++ arch/arm/kernel/topology.c | 91 ++++++++ include/linux/sched.h | 11 + include/trace/events/sched.h | 153 ++++++++++++++ kernel/sched/core.c | 4 + kernel/sched/fair.c | 434 ++++++++++++++++++++++++++++++++++++++- kernel/sched/sched.h | 9 + 8 files changed, 779 insertions(+), 1 deletion(-) -- 1.7.9.5

13 years

2012-10-24 Android Platform Team Meeting Agenda Posted

by Zach Pfeffer

Please take a look at: https://wiki.linaro.org/Platform/Android/Meetings/2012-10-24 Feel free to add to the agenda and join us in #linaro-meeting on irc.freenode.net at 13:00 UTC on 2012/10/24. -- Zach Pfeffer Android Platform Team Lead, Linaro Platform Teams 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

13 years

Re: linaro-dev Digest, Vol 29, Issue 62

by Rajanikanth HV

>> diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c >> index bf02225..ff64dd4 100644 >> --- a/drivers/power/ab8500_fg.c >> +++ b/drivers/power/ab8500_fg.c >> @@ -22,15 +22,16 @@ [...] >> >> #define MILLI_TO_MICRO 1000 >> #define FG_LSB_IN_MA 1627 >> @@ -212,7 +213,6 @@ struct ab8500_fg { >> struct ab8500_fg_avg_cap avg_cap; >> struct ab8500 *parent; >> struct ab8500_gpadc *gpadc; >> - struct abx500_fg_platform_data *pdata; >> struct abx500_bm_data *bat; >> struct power_supply fg_psy; >> struct workqueue_struct *fg_wq; >> @@ -2416,6 +2416,8 @@ static int __devexit ab8500_fg_remove(struct platform_device *pdev) >> int ret = 0; >> struct ab8500_fg *di = platform_get_drvdata(pdev); >> >> + of_node_put(pdev->dev.of_node); > > This is wrong, the probe function doesn't increment the refcount of this > node, so you don't have to decrement it here. you hinted in one of your earlier comments as: " Also, if I'm not mistaken we have a leak here, because the refcount of these nodes is never decremented, not even in the driver remove routine. " while referring bmdevs_of_probe(..), nodes being referred, np and np_bat_supply Note: I found 'refcount of kref' being 1 in case of node obtained from probe() also through of_parse_phandle(...). ref: struct device_node { kref kref } Lee, any comments?

13 years

Linaro Connect Android Remote Sessions, 10/31-11/2

by Zach Pfeffer

Hey everyone! Just wanted to send out a remote participation invite to our upcoming Linaro Connect (or in-person participation if you can manage it). All of these sessions will support remote participation via IRC and Google Hangouts, so you can be part of the action, even if you're not in Copenhagen! And best of all its all free! For anyone who's interested in attending, feel free to email me and I'l make sure to send you a personal invite. In addition if you have any discussion requests its not too late. Please send them in and I'll do my best to include them in the sessions. You can also send a mail to Amber Graner who will be taking care of Remote Participation (and is a fantastic person to talk to anyway!) All the agendas and participates are listed in the following links: Android Mini-Summit 2012-10-31 14:00..15:00 CET 8:00 AM Austin, Texas Vishal Bhoj, Michael Hope, Amit Kucheria, Jesse Barker, Deepak Saxena, Karim Yaghmour, ST-E Android Engineers and Zach Pfeffer http://summit.linaro.org/lce12/meeting/20937/android-mini-summit/ Android Dalvik, V8 and Bionic Optimization Discussion 2012-11-01 10:00..10:45 CET 4:00 AM Austin, Texas Michael Hope and Vishal Bhoj http://summit.linaro.org/lce12/meeting/21164/android-dalvik-v8-and-bionic-o… Android Graphics 2012-11-01 11:00..11:55 CET 5:00 AM Austin, Texas Jesse Barker http://summit.linaro.org/lce12/meeting/21165/android-graphics/ Embedded Android 2012-11-02 11:00..11:55 CET 5:00 AM Austin, Texas Karim Yaghmour http://summit.linaro.org/lce12/meeting/21167/embedded-android/ Android Kernel and Power Feature Discussion 2012-11-02 12:00..13:00 6:00 AM Austin, Texas Deepak Saxena and Amit Kucheria http://summit.linaro.org/lce12/meeting/21166/android-kernel-and-power-featu… See the rest of the sessions at: http://connect.linaro.org/events/event/linaro-connect-q2-12/ Register at: http://connect.linaro.org/wp-login.php?redirect_to=/register-connect/ See ya there - either personally or through the magic inter-web tubes. -- Zach Pfeffer Android Platform Team Lead, Linaro Platform Teams 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

13 years

big.LITTLE MP Checkpoint - 2012.10

by David Zinman

A checkpoint for the big.LITTLE MP project. Delivered Cards ================ http://cards.linaro.org/browse/CARD-34 http://cards.linaro.org/browse/CARD-35 Delivered Blueprints ================== https://blueprints.launchpad.net/linaro-power-kernel/+spec/sched-add-asymme… https://blueprints.launchpad.net/linaro-power-kernel/+spec/cpuidle-upstream… (not directly part of any card by important for 6.) https://blueprints.launchpad.net/linaro-power-qa/+spec/emulating-a-big-litt… Milestone: Q1.2013 Proposed Cards and Associated Blueprints ===================================================== Mobile workload generation suite http://cards.linaro.org/browse/CARD-189 - In Review https://blueprints.launchpad.net/linaro-power-kernel/+spec/perf-record-repl… https://blueprints.launchpad.net/linaro-qa/+spec/sched-test-porting-to-andr… https://blueprints.launchpad.net/linaro-qa/+spec/task-placement-testing Improving HMP Linux scheduling http://cards.linaro.org/browse/CARD-190 - In Review https://blueprints.launchpad.net/linaro-power-kernel/+spec/bl-mp-integratio… https://blueprints.launchpad.net/linaro-power-kernel/+spec/timer-workqueue-… https://blueprints.launchpad.net/linaro-power-kernel/+spec/power-aware-sche… https://blueprints.launchpad.net/linaro-power-kernel/+spec/sched-cooperatio… https://blueprints.launchpad.net/linaro-power-kernel/+spec/multi-cluster-cp… Hotplug Card (TBD) https://blueprints.launchpad.net/linaro-power-kernel/+spec/big.little.mp-ho… https://blueprints.launchpad.net/linaro-android/+spec/cpu-hot-plug-latency https://blueprints.launchpad.net/linaro-qa/+spec/bl-hotplug-tests big.LITTLE MP Testing http://cards.linaro.org/browse/CARD-196 - Drafting https://blueprints.launchpad.net/linaro-qa/+spec/task-placement-testing https://blueprints.launchpad.net/linaro-qa/+spec/sched-test-porting-to-andr… Sleeping more efficiently Sleeping more efficientlyhttp://cards.linaro.org/browse/CARD-191 - Drafting Towards better active-state power management through DVFS http://cards.linaro.org/browse/CARD-192 - Drafting Ongoing Work: https://blueprints.launchpad.net/linaro-power-kernel/+spec/bl-mp-integratio… https://blueprints.launchpad.net/linaro-power-kernel/+spec/perf-record-repl… https://blueprints.launchpad.net/linaro-power-kernel/+spec/big.little.mp-ho… https://blueprints.launchpad.net/linaro-power-kernel/+spec/cpuidle-add-cpu-… Proposed Work: https://blueprints.launchpad.net/linaro-power-kernel/+spec/big.little.mp.oe… https://blueprints.launchpad.net/linaro-power-kernel/+spec/measure-integrat… Builds (2012.09 cycle) -------------------------------- Android: http://releases.linaro.org/12.09/android/images/vexpress-jb-gcc47-armlt-tra… Ubuntu: http://releases.linaro.org/12.09/ubuntu/vexpress/ Latest builds are here: http://www.linaro.org/downloads/ -- David Zinman Linaro Release Manager | Project Manager Linaro.org | Open source software for ARM SoCs

13 years

Service outage: ci.linaro.org/android-build.linaro.org

by Danilo Šegan

Hi all, Due to Amazon EC2/EBS issues last night, ci.linaro.org and android-build.linaro.org have been partially unresponsive. While everything is supposed to be back already, we are hitting problems with Amazon EC2 capacity, which jenkins doesn't handle in the most graceful way. We apologize for the inconvenience this might be causing, but we'll do everything we can to monitor and bring the service up to full capacity as soon as possible. Cheers, Danilo

13 years

Linaro-media-create error

by Tejas Shah

Hello, I am trying to emulate beagleboard in qemu. I am using linaro 11.08 releases of nano rootfs and hwpack (this release is dated as on 2011/08/23) and the version of linaro-media-create I am using is 2012.06. After I run the following command, I do get a image generated but with the following error. Due to this error after I run the image, I cannot mount the image. I have pasted everything from the terminal till the end after I get the error. *$ sudo linaro-media-create --image_file beagle_sd.img --dev beagle --binary nano-n-tar-20110823-1.tar.gz --hwpack hwpack_linaro-omap3_20110823-0_armel_supported.tar.gz* *proc has been unmounted Sleeping for 1 second(s) to wait for the partition to settle Disk beagle_sd.img: cannot get geometry sfdisk: ERROR: sector 0 does not have an msdos signature beagle_sd.img: unrecognized partition table type No partitions found Warning: beagle_sd.img is not a block device Disk beagle_sd.img: cannot get geometry sfdisk: ERROR: sector 0 does not have an msdos signature beagle_sd.img: unrecognized partition table type No partitions found Warning: partition 1 does not end at a cylinder boundary BLKRRPART: Inappropriate ioctl for device If you created or changed a DOS partition, /dev/foo7, say, then use dd(1) to zero the first 512 bytes: dd if=/dev/zero of=/dev/foo7 bs=512 count=1 (See fdisk(8).) Sleeping for 1 second(s) to wait for the partition to settle Disk beagle_sd.img: cannot get geometry start: (c,h,s) expected (0,1,1) found (0,1,32) end: (c,h,s) expected (6,160,25) found (25,127,31) start: (c,h,s) expected (6,160,27) found (26,0,1) end: (c,h,s) expected (391,159,24) found (1023,127,32) partition ends on cylinder 1023, beyond the end of the disk Formating boot partition mkfs.vfat 3.0.12 (29 Oct 2011) Loop device does not match a floppy size, using default hd params Formating root partition mke2fs 1.42 (29-Nov-2011) Filesystem label=rootfs OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 193536 inodes, 773120 blocks 38656 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=792723456 24 block groups 32768 blocks per group, 32768 fragments per group 8064 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912 Allocating group tables: done Writing inode tables: done Creating journal (16384 blocks): done Writing superblocks and filesystem accounting information: done `/tmp/tmpKKLnZe/binary/usr/lib/u-boot/omap3_beagle/u-boot.bin' -> `/tmp/tmpKKLnZe/boot-disc/u-boot.bin' `/tmp/tmpKKLnZe/binary/usr/lib/x-loader/omap3530beagle/MLO' -> `/tmp/tmpKKLnZe/boot-disc/MLO' Image Name: Linux Created: Fri Oct 19 17:03:27 2012 Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 3836224 Bytes = 3746.31 kB = 3.66 MB Load Address: 80008000 Entry Point: 80008000 Image Name: initramfs Created: Fri Oct 19 17:03:27 2012 Image Type: ARM Linux RAMDisk Image (uncompressed) Data Size: 1853452 Bytes = 1810.01 kB = 1.77 MB Load Address: 00000000 Entry Point: 00000000 Image Name: boot script Created: Fri Oct 19 17:03:27 2012 Image Type: ARM Linux Script (uncompressed) Data Size: 444 Bytes = 0.43 kB = 0.00 MB Load Address: 00000000 Entry Point: 00000000 Contents: Image 0: 436 Bytes = 0.43 kB = 0.00 MB `/tmp/tmpKKLnZe/boot-disc/boot.scr' -> `/tmp/tmpKKLnZe/boot-disc/boot.ini' Populating rootfs partition Be patient, this may take a few minutes Creating /etc/flash-kernel.conf Updating /etc/network/interfaces Done creating Linaro image on beagle_sd.img pshah9@ubuntu:~/Downloads/image$ * I know this bug has been reported and the patch has been released by Guilherme (bug # 701678 and here is the link to the patch file https://launchpadlibrarian.net/62892999/udisks.diff ). The linaro-image-tools version that the patch was released was for 0.4.2 but this error still persist in 2012.06. And, I also tried if I can apply this patch on my linaro-media-tool version, but I keep on getting error as the source code has changed and so patch cant be applied. And, there was another bug reported for linaro-image-tools that occurs with the same command. This is not a error but it is warning about /bin/df (bug # 651918): *$ sudo linaro-media-create --image_file beagle_sd.img --dev beagle --binary nano-n-tar-20110823-1.tar.gz --hwpack hwpack_linaro-omap3_20110823-0_armel_supported.tar.gz **/bin/df: Warning: cannot read table of mounted file systems: No such file or directory* * *I get this warning little bit before the above error. I couldn't find any solution for this problem as this bug remains unassigned on launchpad.netwebsite. So, can you please tell me how can I download the linaro-media-tool version that was released after 0.4.2 and contains the above patch or if possible a new patch for 2012.06? I am writing this email directly to this list as I am using it for my thesis and wanted to get it solved as fast as possible. Tejas

13 years

LCE12: QA Pilot test plan kick off at Connect 2012

by Naresh Kamboju

Hi All, Greeting from QA Team. INFO: The QA Services team can offer test planning and sign-off services to Working Groups for their major road-map items. We are planning to kick off road-map piloting for Linaro Engineering efforts at Connect 2012. Card http://cards.linaro.org/browse/CARD-140 briefs about QA's road-map sign off piloting. STATUS: We have been providing QA services to projects like big.LITTLE System, big.LITTLE MP and general Android and Ubuntu Daily, Weekly and Monthly release testing. We have well defined test plans, test execution cycles and test plan sign-off for above Projects. ACTION: We would like to have a pre-discussion about your (Working Group) requirement and expectation from QA team regarding creating test suite, planning, development, integration with Ubuntu, Android and LAVA. Please also let us know the cards/projects which are in a need of QA services. we are ready to help you. MEET: we would also like you to invite for QA meeting planned at LCE12 for further discussion http://summit.linaro.org/lce12/meeting/21226/roadmap-card-qa-and-sign-off/ Regards, QA Services Linaro Platform http://wiki.linaro.org/Platform/QA

13 years

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