eas-dev

eas-dev@lists.linaro.org

423 discussions

by Chris Redpath

Hello eas-dev! I'm pleased to announce that EAS development is moving to the next version of the android common kernel, android-4.9. * EAS development will be done in a new android-4.9-eas-dev branch * android-4.9-eas-dev will be merged into android-4.9 twice during the period January - June 2018 * EAS functionality in android-4.4 is frozen * an android-4.4-eas-test branch is provided to help testing new EAS features on android-4.4 devices * assembly of an android common kernel based upon 4.14 is underway Q&A: * Why have you moved to android-4.9? * Partners developing devices have largely completed their android-4.4 derived device kernels and continuous development of EAS features is disruptive to tuning efforts * Device kernels derived from android-4.9 are in active development * Will you deliver new EAS patches to android-4.4? * The plan is to only do fixes for critical bugs for android-4.4 * How will you be confident your patches are OK when you don't have devices running android-4.9 kernels yet? * This is the reason that the android-4.4-eas-test branch exists * This branch will contain patches which are merged into android-4.9-eas-dev and can be used to help test on device kernels derived from android-4.4 * The content will be whatever patches are necessary to be able to add patches from android-4.9-eas-dev cleanly, plus the patches from android-4.9-eas-dev * android-4.4-eas-test will be updated until we have a product quality device for testing with android-4.9 derived kernels * What is the expected patch flow for testing eas-dev patches on android-4.4? * first cherry-pick the patches from android-4.4-eas-test to the device kernel * next cherry-pick in-development patches from android-4.9-eas-dev gerrit reviews * run tests to obtain power and performance numbers from real product-quality environments * How critical are you going to be for patches sent to android-4.9-eas-dev? * Patches accepted there must be of good code quality and have at least one of the four necessary attributes: 1. Must reduce energy consumption 2. Must improve performance 3. Must bring android EAS closer to mainline 4. Must fix a bug * All patches must pass checkpatch.pl * Given that you intend to merge android-4.9-eas-dev into android-4.9, will you freeze it at any time? * Yes. The intention is to have a 1 month stabilization ahead of each merge (January and June) * For the January merge, stabilization will begin December 1st, 2017. * For the June merge, stabilization will begin May 1st, 2018 * During stabilization, only fixes will be taken * Will there be merges in-between January and June? * We do not plan to do this right now, but in principle it can be done * When will android-4.4-eas-test update after android-4.9-eas-dev merges into android-4.9? * We intend to add patches to android-4.4-eas-test for review soon after merging them * What happens if there is a bug in the merged branch? * A fix will be provided to android-4.9 and android-4.9-eas-dev * The fix will be reflected in android-4.4-eas-test * Can I expect this to happen again any time soon? * Yes, there has been a new android common kernel based on a new LTS branch each year so far * Arm expects that pattern to continue * If the pattern holds, in October 2018 the target android kernel version for EAS development will be based on Linux 4.14 * We currently plan to use the same branching structure with the version numbers changed * Dates are projections based upon previous android releases and are subject to change * The kernel versions of eas-dev and eas-test branches are driven by the availability of suitable development and testing platforms, so are also subject to change * What happens when you move to a 4.14 kernel? * After changes are reviewed and merged into android-4.9 from android-4.9-eas-test, those changes will be pushed for review on the 4.14 android branch * Anything merged in android's 4.14 branch which is broken will also be patched Warmest Regards, Chris Redpath Open Source Software Power Team @ arm

8 years

[PATCH RFC 0/5] sched and cpufreq fixes/cleanups

by Joel Fernandes

Here are some patches that are generally minor changes and I am posting them together. Patches 1/5 and 2/5 are related to skipping cpufreq updates for the dequeue of the last task before the CPU enters idle. That's just a rebase of [1] mostly. Patches 3/5 and 4/5 fix some minor things I noticed after the remote cpufreq update work. and patch 5/5 is just a small clean up of find_idlest_group. Let me know your thoughts and thanks. I've based these patches on peterz's queue.git master branch. [1] https://patchwork.kernel.org/patch/9936555/ Joel Fernandes (5): Revert "sched/fair: Drop always true parameter of update_cfs_rq_load_avg()" sched/fair: Skip frequency update if CPU about to idle cpufreq: schedutil: Use idle_calls counter of the remote CPU sched/fair: Correct obsolete comment about cpufreq_update_util sched/fair: remove impossible condition from find_idlest_group_cpu include/linux/tick.h | 1 + kernel/sched/cpufreq_schedutil.c | 2 +- kernel/sched/fair.c | 44 ++++++++++++++++++++++++++++------------ kernel/sched/sched.h | 1 + kernel/time/tick-sched.c | 13 ++++++++++++ 5 files changed, 47 insertions(+), 14 deletions(-) -- 2.15.0.rc2.357.g7e34df9404-goog

8 years

EAS r1.4 release

by Ian Rickards

ARM has released EAS r1.4. The main changes in this release are: EAS refactoring improvements Fixes to sched-freq for big.LITTLE platforms Upstream PELT and load balance improvements Upstream schedutil changes Cumulative Runnable Average signal for OPP selection when using WALT Improved WALT integration with EAS Linux-4.4 version is merged into AOSP common kernel 4.4: https://android.googlesource.com/kernel/common/+/android-4.4 Linux-4.9 version is merged into AOSP common kernel 4.9: https://android.googlesource.com/kernel/common/+/android-4.9 Release documentation is here: https://developer.arm.com/-/media/developer/developers/open-source/energy-a… Basic testing on ARM Juno & Hikey960 using LISA tests -- ARM powersoftware team

8 years

'wltests' automated power/performance comparisons

by Ian Rickards

wltests (workload tests) ARM is pleased to announce a new automated test suite for benchmarking Linux scheduler & EAS improvements on Android workloads. wltests is built on top of Lisa and Workload Automation (in-development version of WA v3) with the goal of: * automatically running a range of Android-based tests on a platform, collecting performance and power metrics * comparing different kernel versions and/or kernel options * analyzing differences using Lisa-based notebooks * easier porting to custom platform It is intended to allow full evaluation of EAS/scheduler changes with real Android workloads (for example PELT vs. WALT comparisons) The current set of workloads are: * Jankbench * Exoplayer for video & audio playback tests * Youtube (if gapps available on platform) * PCmark * Geekbench * Homescreen (to measure steady state energy consumption) Install entire Lisa first according to installation instructions (Lisa now includes an in-development version of WA v3) https://github.com/ARM-software/lisa/wiki/Installation#required-dependencies The VM can be used if you have incompatibilities with locally-installed python libraries Please see README.md in the wltests directory: https://github.com/ARM-software/lisa/tree/master/tools/wltests If you have concerns about results being published for in-development hardware, comment out the commercial benchmarks (PCmark & Geekbench) in the agenda: tools/wltests/agendas/sched-evaluation-full.yaml Platform - currently only one public platform (Linaro HiKey960): tools/wltests/platforms/hikey960_android-4.4 (this actually works for 4.4 and 4.9 based kernels) Adding a new platform is easy - 3 files in platform directory Any questions please let us know! -- ARM powersoftware team

8 years

Microsoft Dynamics Users List

by Erin Marino

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8 years

Question about change in EAS 1.4 (from ACK 4.4)

by Zachariah Kennedy

Works better with a subject! ;) Hey guys, This is a question for Brendan Jackman but feel free to chime in if you know the answer. I am having an issue when pulling in the new EAS 1.4 changes from ACK4.4. Mainly, I am getting a warning from: https://android.googlesource.com/kernel/common.git/+/a21299785a502ca4b3592a… You can see the warning below: c0 1865 [20171029_10:29:47.834626]@0 PC is at build_sched_domains+0xc00/0xcc8 c0 1865 [20171029_10:29:47.834632]@0 LR is at build_sched_domains+0xc00/0xcc8 c0 1865 [20171029_10:29:47.834637]@0 pc : [<ffffff84000d2758>] lr : [<ffffff84000d2758>] pstate: 60000145 c0 1865 [20171029_10:29:47.834641]@0 sp : ffffffcac19b3800 c0 1865 [20171029_10:29:47.834645]@0 x29: ffffffcac19b3800 x28: ffffff8401df7ee4 c0 1865 [20171029_10:29:47.834652]@0 x27: ffffffcae6626480 x26: ffffff8401e08858 c0 1865 [20171029_10:29:47.834658]@0 x25: ffffffcaf35fc780 x24: ffffff8400f77238 c0 1865 [20171029_10:29:47.834665]@0 x23: ffffff8401df85a0 x22: ffffff8401777400 c0 1865 [20171029_10:29:47.834672]@0 x21: 0000000000000008 x20: ffffff8401777400 c0 1865 [20171029_10:29:47.834678]@0 x19: ffffff8401df7ee4 x18: 00000000ffffffe8 c0 1865 [20171029_10:29:47.834684]@0 x17: 0000000000000000 x16: 0000000000000000 c0 1865 [20171029_10:29:47.834691]@0 x15: ffffff8401e16850 x14: 6465686373206572 c0 1865 [20171029_10:29:47.834697]@0 x13: 6177612079677265 x12: 6e6520726f662061 c0 1865 [20171029_10:29:47.834703]@0 x11: 74616420676e6973 x10: 73694d2030405d35 c0 1865 [20171029_10:29:47.834709]@0 x9 : 37353433382e3734 x8 : ffffffcaf46402ab c0 1865 [20171029_10:29:47.834715]@0 x7 : 0000000000000000 x6 : 000002257b061a96 c0 1865 [20171029_10:29:47.834721]@0 x5 : 00ffffffffffffff x4 : 0000000000000000 c0 1865 [20171029_10:29:47.834727]@0 x3 : 0000000000000140 x2 : a2032cf00b50bf18 c0 1865 [20171029_10:29:47.834734]@0 x1 : 0000000000000000 x0 : 0000000000000045 c0 1865 [20171029_10:29:47.834740]@0 c0 1865 PC: 0xffffff84000d2718: c0 1865 [20171029_10:29:47.834744]@0 2718 9120bc21 39402424 35ffec84 d4210000 52800024 39002424 17ffff60 d503201f c0 1865 [20171029_10:29:47.834756]@0 2738 9400e4a6 d503201f 97ffdcfc 72001c1f 54ffe501 b0009ac0 911a8000 9402a9cb c0 1865 [20171029_10:29:47.834767]@0 2758 d4210000 17ffff23 aa1403e0 9403d705 12800160 f9006fbf b90067a0 17ffff20 c0 1865 [20171029_10:29:47.834778]@0 2778 97ff3ab2 b9401005 b9401321 6b0100bf 54fffa81 34fff6a5 f9400c02 f9400f21 c0 1865 [20171029_10:29:47.834790]@0 c0 1865 LR: 0xffffff84000d2718: c0 1865 [20171029_10:29:47.834794]@0 2718 9120bc21 39402424 35ffec84 d4210000 52800024 39002424 17ffff60 d503201f c0 1865 [20171029_10:29:47.834806]@0 2738 9400e4a6 d503201f 97ffdcfc 72001c1f 54ffe501 b0009ac0 911a8000 9402a9cb c0 1865 [20171029_10:29:47.834817]@0 2758 d4210000 17ffff23 aa1403e0 9403d705 12800160 f9006fbf b90067a0 17ffff20 c0 1865 [20171029_10:29:47.834828]@0 2778 97ff3ab2 b9401005 b9401321 6b0100bf 54fffa81 34fff6a5 f9400c02 f9400f21 c0 1865 [20171029_10:29:47.834840]@0 c0 1865 SP: 0xffffffcac19b37c0: c0 1865 [20171029_10:29:47.834844]@0 37c0 000d2758 ffffff84 c19b3800 ffffffca 000d2758 ffffff84 60000145 00000000 c0 1865 [20171029_10:29:47.834855]@0 37e0 00000008 00000000 000000ff 00000000 00000000 00000080 f3405d50 ffffffca c0 1865 [20171029_10:29:47.834867]@0 3800 c19b38f0 ffffffca 000d2bbc ffffff84 00000000 00000000 01feacd0 ffffff84 c0 1865 [20171029_10:29:47.834878]@0 3820 01feab00 ffffff84 00000000 00000000 01feab00 ffffff84 00000004 00000000 c0 1865 [20171029_10:29:47.834890]@0 c0 1865 [20171029_10:29:47.834894]@0 ---[ end trace f7934377fe8659bc ]--- c0 1865 [20171029_10:29:47.834899]@0 Call trace: c0 1865 [20171029_10:29:47.834904]@0 Exception stack(0xffffffcac19b3610 to 0xffffffcac19b3740) c0 1865 [20171029_10:29:47.834910]@0 3600: ffffff8401df7ee4 0000008000000000 c0 1865 [20171029_10:29:47.834917]@0 3620: ffffffcac19b3800 ffffff84000d2758 0000000060000145 ffffff8401777400 c0 1865 [20171029_10:29:47.834923]@0 3640: ffffff8401df85a0 ffffff8400f77238 ffffffcaf35fc780 ffffff8401e08858 c0 1865 [20171029_10:29:47.834930]@0 3660: ffffffcae6626480 ffffff8401df7ee4 ffffffcac19b36c0 ffffff8401fecb90 c0 1865 [20171029_10:29:47.834937]@0 3680: 0000000000000000 00004d1712d78a33 ffffff8401fed000 00000000fcbeb400 c0 1865 [20171029_10:29:47.834943]@0 36a0: ffffff8401fed550 0000000000000140 ffffffcac19b3800 ffffffcac19b3800 c0 1865 [20171029_10:29:47.834950]@0 36c0: ffffffcac19b37c0 a2032cf00b50bf18 0000000000000045 0000000000000000 c0 1865 [20171029_10:29:47.834957]@0 36e0: a2032cf00b50bf18 0000000000000140 0000000000000000 00ffffffffffffff c0 1865 [20171029_10:29:47.834964]@0 3700: 000002257b061a96 0000000000000000 ffffffcaf46402ab 37353433382e3734 c0 1865 [20171029_10:29:47.834970]@0 3720: 73694d2030405d35 74616420676e6973 6e6520726f662061 6177612079677265 c0 1865 [20171029_10:29:47.834977]@0 [<ffffff84000d2758>] build_sched_domains+0xc00/0xcc8 c0 1865 [20171029_10:29:47.834983]@0 [<ffffff84000d2bbc>] partition_sched_domains+0x35c/0x410 c0 1865 [20171029_10:29:47.834990]@0 [<ffffff84000d2cb0>] cpuset_cpu_active+0x40/0x78 c0 1865 [20171029_10:29:47.834997]@0 [<ffffff84000c0a80>] notifier_call_chain+0x50/0x90 c0 1865 [20171029_10:29:47.835005]@0 [<ffffff84000c0be4>] __raw_notifier_call_chain+0xc/0x18 c0 1865 [20171029_10:29:47.835013]@0 [<ffffff84000a16e8>] cpu_notify+0x28/0x48 c0 1865 [20171029_10:29:47.835019]@0 [<ffffff84000a200c>] _cpu_up+0x23c/0x250 c0 1865 [20171029_10:29:47.835026]@0 [<ffffff84000a25cc>] enable_nonboot_cpus+0xc4/0x258 c0 1865 [20171029_10:29:47.835032]@0 [<ffffff84000fcb84>] suspend_enter+0x304/0x5f8 c0 1865 [20171029_10:29:47.835038]@0 [<ffffff84000fcf4c>] suspend_devices_and_enter+0xd4/0x310 c0 1865 [20171029_10:29:47.835045]@0 [<ffffff84000fd630>] pm_suspend+0x4a8/0x640 c0 1865 [20171029_10:29:47.835051]@0 [<ffffff84000fba84>] state_store+0x94/0xa8 c0 1865 [20171029_10:29:47.835058]@0 [<ffffff84003b642c>] kobj_attr_store+0x14/0x28 c0 1865 [20171029_10:29:47.835066]@0 [<ffffff8400243178>] sysfs_kf_write+0x48/0x58 c0 1865 [20171029_10:29:47.835073]@0 [<ffffff840024258c>] kernfs_fop_write+0xbc/0x190 c0 1865 [20171029_10:29:47.835080]@0 [<ffffff84001d2bb4>] __vfs_write+0x34/0xf8 c0 1865 [20171029_10:29:47.835086]@0 [<ffffff84001d34cc>] vfs_write+0x8c/0x178 c0 1865 [20171029_10:29:47.835093]@0 [<ffffff84001d3f64>] SyS_write+0x5c/0xc8 c0 1865 [20171029_10:29:47.835100]@0 [<ffffff8400084630>] el0_svc_naked+0x24/0x28 c0 1865 [20171029_10:29:47.836943]@0 Missing data for energy aware scheduling c0 1865 [20171029_10:29:47.836950]@0 ------------[ cut here ]------------ The error only occurs during suspend or if I manually set a core(s) to offline. This just floods the log during suspend. Is this the expected behavior? Kind Regards, Zachariah Kennedy

8 years, 1 month

(no subject)

by Zachariah Kennedy

Hey guys, This is a question for Brendan Jackman but feel free to chime in. I am having an issue when pulling in the new EAS 1.4 changes from ACK4.4. Mainly, I am getting a warning from: https://android.googlesource.com/kernel/common.git/+/a21299785a502ca4b3592a… You can see the warning below: c0 1865 [20171029_10:29:47.834626]@0 PC is at build_sched_domains+0xc00/0xcc8 c0 1865 [20171029_10:29:47.834632]@0 LR is at build_sched_domains+0xc00/0xcc8 c0 1865 [20171029_10:29:47.834637]@0 pc : [<ffffff84000d2758>] lr : [<ffffff84000d2758>] pstate: 60000145 c0 1865 [20171029_10:29:47.834641]@0 sp : ffffffcac19b3800 c0 1865 [20171029_10:29:47.834645]@0 x29: ffffffcac19b3800 x28: ffffff8401df7ee4 c0 1865 [20171029_10:29:47.834652]@0 x27: ffffffcae6626480 x26: ffffff8401e08858 c0 1865 [20171029_10:29:47.834658]@0 x25: ffffffcaf35fc780 x24: ffffff8400f77238 c0 1865 [20171029_10:29:47.834665]@0 x23: ffffff8401df85a0 x22: ffffff8401777400 c0 1865 [20171029_10:29:47.834672]@0 x21: 0000000000000008 x20: ffffff8401777400 c0 1865 [20171029_10:29:47.834678]@0 x19: ffffff8401df7ee4 x18: 00000000ffffffe8 c0 1865 [20171029_10:29:47.834684]@0 x17: 0000000000000000 x16: 0000000000000000 c0 1865 [20171029_10:29:47.834691]@0 x15: ffffff8401e16850 x14: 6465686373206572 c0 1865 [20171029_10:29:47.834697]@0 x13: 6177612079677265 x12: 6e6520726f662061 c0 1865 [20171029_10:29:47.834703]@0 x11: 74616420676e6973 x10: 73694d2030405d35 c0 1865 [20171029_10:29:47.834709]@0 x9 : 37353433382e3734 x8 : ffffffcaf46402ab c0 1865 [20171029_10:29:47.834715]@0 x7 : 0000000000000000 x6 : 000002257b061a96 c0 1865 [20171029_10:29:47.834721]@0 x5 : 00ffffffffffffff x4 : 0000000000000000 c0 1865 [20171029_10:29:47.834727]@0 x3 : 0000000000000140 x2 : a2032cf00b50bf18 c0 1865 [20171029_10:29:47.834734]@0 x1 : 0000000000000000 x0 : 0000000000000045 c0 1865 [20171029_10:29:47.834740]@0 c0 1865 PC: 0xffffff84000d2718: c0 1865 [20171029_10:29:47.834744]@0 2718 9120bc21 39402424 35ffec84 d4210000 52800024 39002424 17ffff60 d503201f c0 1865 [20171029_10:29:47.834756]@0 2738 9400e4a6 d503201f 97ffdcfc 72001c1f 54ffe501 b0009ac0 911a8000 9402a9cb c0 1865 [20171029_10:29:47.834767]@0 2758 d4210000 17ffff23 aa1403e0 9403d705 12800160 f9006fbf b90067a0 17ffff20 c0 1865 [20171029_10:29:47.834778]@0 2778 97ff3ab2 b9401005 b9401321 6b0100bf 54fffa81 34fff6a5 f9400c02 f9400f21 c0 1865 [20171029_10:29:47.834790]@0 c0 1865 LR: 0xffffff84000d2718: c0 1865 [20171029_10:29:47.834794]@0 2718 9120bc21 39402424 35ffec84 d4210000 52800024 39002424 17ffff60 d503201f c0 1865 [20171029_10:29:47.834806]@0 2738 9400e4a6 d503201f 97ffdcfc 72001c1f 54ffe501 b0009ac0 911a8000 9402a9cb c0 1865 [20171029_10:29:47.834817]@0 2758 d4210000 17ffff23 aa1403e0 9403d705 12800160 f9006fbf b90067a0 17ffff20 c0 1865 [20171029_10:29:47.834828]@0 2778 97ff3ab2 b9401005 b9401321 6b0100bf 54fffa81 34fff6a5 f9400c02 f9400f21 c0 1865 [20171029_10:29:47.834840]@0 c0 1865 SP: 0xffffffcac19b37c0: c0 1865 [20171029_10:29:47.834844]@0 37c0 000d2758 ffffff84 c19b3800 ffffffca 000d2758 ffffff84 60000145 00000000 c0 1865 [20171029_10:29:47.834855]@0 37e0 00000008 00000000 000000ff 00000000 00000000 00000080 f3405d50 ffffffca c0 1865 [20171029_10:29:47.834867]@0 3800 c19b38f0 ffffffca 000d2bbc ffffff84 00000000 00000000 01feacd0 ffffff84 c0 1865 [20171029_10:29:47.834878]@0 3820 01feab00 ffffff84 00000000 00000000 01feab00 ffffff84 00000004 00000000 c0 1865 [20171029_10:29:47.834890]@0 c0 1865 [20171029_10:29:47.834894]@0 ---[ end trace f7934377fe8659bc ]--- c0 1865 [20171029_10:29:47.834899]@0 Call trace: c0 1865 [20171029_10:29:47.834904]@0 Exception stack(0xffffffcac19b3610 to 0xffffffcac19b3740) c0 1865 [20171029_10:29:47.834910]@0 3600: ffffff8401df7ee4 0000008000000000 c0 1865 [20171029_10:29:47.834917]@0 3620: ffffffcac19b3800 ffffff84000d2758 0000000060000145 ffffff8401777400 c0 1865 [20171029_10:29:47.834923]@0 3640: ffffff8401df85a0 ffffff8400f77238 ffffffcaf35fc780 ffffff8401e08858 c0 1865 [20171029_10:29:47.834930]@0 3660: ffffffcae6626480 ffffff8401df7ee4 ffffffcac19b36c0 ffffff8401fecb90 c0 1865 [20171029_10:29:47.834937]@0 3680: 0000000000000000 00004d1712d78a33 ffffff8401fed000 00000000fcbeb400 c0 1865 [20171029_10:29:47.834943]@0 36a0: ffffff8401fed550 0000000000000140 ffffffcac19b3800 ffffffcac19b3800 c0 1865 [20171029_10:29:47.834950]@0 36c0: ffffffcac19b37c0 a2032cf00b50bf18 0000000000000045 0000000000000000 c0 1865 [20171029_10:29:47.834957]@0 36e0: a2032cf00b50bf18 0000000000000140 0000000000000000 00ffffffffffffff c0 1865 [20171029_10:29:47.834964]@0 3700: 000002257b061a96 0000000000000000 ffffffcaf46402ab 37353433382e3734 c0 1865 [20171029_10:29:47.834970]@0 3720: 73694d2030405d35 74616420676e6973 6e6520726f662061 6177612079677265 c0 1865 [20171029_10:29:47.834977]@0 [<ffffff84000d2758>] build_sched_domains+0xc00/0xcc8 c0 1865 [20171029_10:29:47.834983]@0 [<ffffff84000d2bbc>] partition_sched_domains+0x35c/0x410 c0 1865 [20171029_10:29:47.834990]@0 [<ffffff84000d2cb0>] cpuset_cpu_active+0x40/0x78 c0 1865 [20171029_10:29:47.834997]@0 [<ffffff84000c0a80>] notifier_call_chain+0x50/0x90 c0 1865 [20171029_10:29:47.835005]@0 [<ffffff84000c0be4>] __raw_notifier_call_chain+0xc/0x18 c0 1865 [20171029_10:29:47.835013]@0 [<ffffff84000a16e8>] cpu_notify+0x28/0x48 c0 1865 [20171029_10:29:47.835019]@0 [<ffffff84000a200c>] _cpu_up+0x23c/0x250 c0 1865 [20171029_10:29:47.835026]@0 [<ffffff84000a25cc>] enable_nonboot_cpus+0xc4/0x258 c0 1865 [20171029_10:29:47.835032]@0 [<ffffff84000fcb84>] suspend_enter+0x304/0x5f8 c0 1865 [20171029_10:29:47.835038]@0 [<ffffff84000fcf4c>] suspend_devices_and_enter+0xd4/0x310 c0 1865 [20171029_10:29:47.835045]@0 [<ffffff84000fd630>] pm_suspend+0x4a8/0x640 c0 1865 [20171029_10:29:47.835051]@0 [<ffffff84000fba84>] state_store+0x94/0xa8 c0 1865 [20171029_10:29:47.835058]@0 [<ffffff84003b642c>] kobj_attr_store+0x14/0x28 c0 1865 [20171029_10:29:47.835066]@0 [<ffffff8400243178>] sysfs_kf_write+0x48/0x58 c0 1865 [20171029_10:29:47.835073]@0 [<ffffff840024258c>] kernfs_fop_write+0xbc/0x190 c0 1865 [20171029_10:29:47.835080]@0 [<ffffff84001d2bb4>] __vfs_write+0x34/0xf8 c0 1865 [20171029_10:29:47.835086]@0 [<ffffff84001d34cc>] vfs_write+0x8c/0x178 c0 1865 [20171029_10:29:47.835093]@0 [<ffffff84001d3f64>] SyS_write+0x5c/0xc8 c0 1865 [20171029_10:29:47.835100]@0 [<ffffff8400084630>] el0_svc_naked+0x24/0x28 c0 1865 [20171029_10:29:47.836943]@0 Missing data for energy aware scheduling c0 1865 [20171029_10:29:47.836950]@0 ------------[ cut here ]------------ The error only occurs during suspend or if I manually set a core(s) to offline. This just floods the log during suspend. Is this the expected behavior? Kind Regards, Zachariah Kennedy

8 years, 1 month

[RFC eas-dev] sched: Consider RT/IRQ pressure in capacity_spare_wake

by Joel Fernandes

capacity_spare_wake in the slow path influences choice of idlest groups, as we search for groups with maximum spare capacity. In scenarios where RT pressure is high, a sub optimal group can be chosen and hurt performance of the task being woken up. Several tests with results are included below to show improvements with this change. 1) Hackbench on Pixel 2 Android device (4x4 ARM64 Octa core) ------------------------------------------------------------ Here we have RT activity running on big CPU cluster induced with rt-app, and running hackbench in parallel. The RT tasks are bound to 4 CPUs on the big cluster (cpu 4,5,6,7) and have 100ms periodicity with runtime=20ms sleep=80ms. Hackbench shows big benefit (30%) improvement when number of tasks is 8 and 32: Note: data is completion time in seconds (lower is better). Number of loops for 8 and 16 tasks is 50000, and for 32 tasks its 20000. +--------+-----+-------+-------------------+---------------------------+ | groups | fds | tasks | Without Patch | With Patch | +--------+-----+-------+---------+---------+-----------------+---------+ | | | | Mean | Stdev | Mean | Stdev | | | | +-------------------+-----------------+---------+ | 1 | 8 | 8 | 1.0534 | 0.13722 | 0.7293 (+30.7%) | 0.02653 | | 2 | 8 | 16 | 1.6219 | 0.16631 | 1.6391 (-1%) | 0.24001 | | 4 | 8 | 32 | 1.2538 | 0.13086 | 1.1080 (+11.6%) | 0.16201 | +--------+-----+-------+---------+---------+-----------------+---------+ 2) Rohit ran barrier.c test (details below) with following improvements: ------------------------------------------------------------------------ This was Rohit's original use case for a patch he posted at [1] however from his recent tests he showed my patch can replace his slow path changes [1] and there's no need to selectively scan/skip CPUs in find_idlest_group_cpu in the slow path to get the improvement he sees. barrier.c (open_mp code) as a micro-benchmark. It does a number of iterations and barrier sync at the end of each for loop. Here barrier,c is running in along with ping on CPU 0 and 1 as: 'ping -l 10000 -q -s 10 -f hostX' barrier.c can be found at: http://www.spinics.net/lists/kernel/msg2506955.html Following are the results for the iterations per second with this micro-benchmark (higher is better), on a 44 core, 2 socket 88 Threads Intel x86 machine: +--------+------------------+---------------------------+ |Threads | Without patch | With patch | | | | | +--------+--------+---------+-----------------+---------+ | | Mean | Std Dev | Mean | Std Dev | +--------+--------+---------+-----------------+---------+ |1 | 539.36 | 60.16 | 572.54 (+6.15%) | 40.95 | |2 | 481.01 | 19.32 | 530.64 (+10.32%)| 56.16 | |4 | 474.78 | 22.28 | 479.46 (+0.99%) | 18.89 | |8 | 450.06 | 24.91 | 447.82 (-0.50%) | 12.36 | |16 | 436.99 | 22.57 | 441.88 (+1.12%) | 7.39 | |32 | 388.28 | 55.59 | 429.4 (+10.59%)| 31.14 | |64 | 314.62 | 6.33 | 311.81 (-0.89%) | 11.99 | +--------+--------+---------+-----------------+---------+ 3) ping+hackbench test on bare-metal sever (Rohit ran this test) ---------------------------------------------------------------- Here hackbench is running in threaded mode along with, running ping on CPU 0 and 1 as: 'ping -l 10000 -q -s 10 -f hostX' This test is running on 2 socket, 20 core and 40 threads Intel x86 machine: Number of loops is 10000 and runtime is in seconds (Lower is better). +--------------+-----------------+--------------------------+ |Task Groups | Without patch | With patch | | +-------+---------+----------------+---------+ |(Groups of 40)| Mean | Std Dev | Mean | Std Dev | +--------------+-------+---------+----------------+---------+ |1 | 0.851 | 0.007 | 0.828 (+2.77%)| 0.032 | |2 | 1.083 | 0.203 | 1.087 (-0.37%)| 0.246 | |4 | 1.601 | 0.051 | 1.611 (-0.62%)| 0.055 | |8 | 2.837 | 0.060 | 2.827 (+0.35%)| 0.031 | |16 | 5.139 | 0.133 | 5.107 (+0.63%)| 0.085 | |25 | 7.569 | 0.142 | 7.503 (+0.88%)| 0.143 | +--------------+-------+---------+----------------+---------+ [1] https://patchwork.kernel.org/patch/9991635/ Cc: Dietmar Eggemann <dietmar.eggemann(a)arm.com> Cc: Vincent Guittot <vincent.guittot(a)linaro.org> Cc: Morten Ramussen <morten.rasmussen(a)arm.com> Cc: Brendan Jackman <brendan.jackman(a)arm.com> Cc: Matt Fleming <matt(a)codeblueprint.co.uk> Tested-by: Rohit Jain <rohit.k.jain(a)oracle.com> Signed-off-by: Joel Fernandes <joelaf(a)google.com> --- kernel/sched/fair.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 740602ce799f..487e485b3560 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5742,7 +5742,7 @@ static int cpu_util_wake(int cpu, struct task_struct *p); static unsigned long capacity_spare_wake(int cpu, struct task_struct *p) { - return capacity_orig_of(cpu) - cpu_util_wake(cpu, p); + return max_t(long, capacity_of(cpu) - cpu_util_wake(cpu, p), 0); } /* -- 2.15.0.rc2.357.g7e34df9404-goog

8 years, 1 month

Improvement by replacing capacity_orig_of with capacity_of in wakeup

by Joel Fernandes

Hi, I tried an experiment this weekend - basically I have RT threads bound to big CPUs running a fixed period load, with hack bench running with all CPUs allowed. The system is a Pixel2 ARM big.LITTLE 8-core (4x4). Basically, I changed capacity_orig_of to capacity_of in capacity_spare_wake and wake_cap and I see a good performance improvement. That makes sense because wake_cap would send the task wake up to the slow-path if RT capacity was eating into the CFS capacity on prev/current CPU, and capacity_spare_wake would find a better group with spare-capacity deducted by the RT pressure capacity. One of the concerns for such a change to wake_cap, that I had, was that it might affect upstream cases that may still want to do a select_idle_sibling even if the capacity on the previous/waker's CPU was not enough after deducting RT pressure. In that case, the wake_cap change to use capacity_of would cause it to enter the slow-path for those cases I think. Could you let me know your thoughts about such a change? I heard that capacity_of was attempted before and there might be some cases to consider. Anything from your previous experiences with this change that you could share? Atleast for capacity_spare_wake, the improvements seems to be worthwhile and dramatic in some cases. I also have some more changes I am thinking off to find_idlest_group but I wanted to start a discussion on the spare capacity idea first. This is related to Rohit's work on RT Capacity awareness, I was talking to him and we were discussing ideas on the implementation. thanks, - Joel

8 years, 1 month

[PATCH 0/3] sched/fair: Remote load updates for idle CPUs

by Brendan Jackman

The blocked load and shares of root cfs_rqs is currently only updated by a the CPU owning the rq. That means if a CPU goes suddenly from being busy to totally idle, its load and shares are not updated. Schedutil works around this problem by ignoring the util of CPUs that were last updated more than a tick ago. However the stale load does impact task placement: elements that look at load and util (in particular the slow-path of select_task_rq_fair) can leave the idle CPUs un-used while other CPUs go unnecessarily overloaded. Furthermore the stale shares can impact CPU time allotment. Two complementary solutions are proposed here: 1. When a task wakes up, if necessary an idle CPU is woken as if to perform a NOHZ idle balance, which is then aborted once the load of NOHZ idle CPUs has been updated. This solves the problem but brings with it extra CPU wakeups, which have an energy cost. 2. During newly-idle load balancing, the load of remote nohz-idle CPUs in the sched_domain is updated. When all of the idle CPUs were updated in that step, the nohz.next_update field is pushed further into the future. This field is used to determine the need for triggering the newly-added NOHZ kick. So if such newly-idle balances are happening often enough, no additional CPU wakeups are required to keep all the CPUs' loads updated. [eas-dev] Patch 2/3 here is to highlight a change I made from Vincent's original patch, so that it can be reviewed more easily - if the modification is accepted then I'll squash it before posting this to LKML proper. Brendan Jackman (2): sched/fair: Refactor nohz blocked load udpates sched/fair: Update blocked load from newly idle balance Vincent Guittot (1): sched: force update of blocked load of idle cpus kernel/sched/core.c | 1 + kernel/sched/fair.c | 106 ++++++++++++++++++++++++++++++++++++++++++++------- kernel/sched/sched.h | 2 + 3 files changed, 96 insertions(+), 13 deletions(-) -- 2.14.1

8 years, 1 month

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