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423 discussions

[RFC 0/5] EAS in Tizen kernel on Exynos5433 SoC

by Lukasz Luba

Hi Quentin and EAS team, As we discussed offline with Quentin my issues with EAS (a bit old version) and tasks migration, here is the patch set that I have with some fixes. The version that I have been working on is: - kernel: 4.14.24 with some driver fixes for Exynos SoC (it was close to eas/next/integration_base_20171211_0913) - EAS: eas/next/integration_20171211_0913 http://linux-arm.org/git?p=linux-power.git;a=shortlog;h=refs/heads/eas/next… This patch set tries to solve: - issue with one little core not used in 1st phase, - issues with not used LITTLE cores in the second phase, The test script uses sysbench in 2 phases. First it starts two task sets: 4 tasks on big cores and 4 will be on little. The big tasks finish earlier and little should be migrated there. Then there is the second phase. The set of 4 new tasks is started and should be placed on little cores. ------------8<------------------- REQUESTS=20000 BIGS="4 5 6 7" LITTLES="0 1 2 3" PATH="$PATH:/root/devlib-target/bin" # Don't care about the score for those, just keep the bigs busy for i in $BIGS; do taskset -c $i sysbench --max-requests=$((REQUESTS / 4)) \ --test=cpu run &>/dev/null & done for i in $LITTLES; do $(sleep 25 && sysbench --max-requests=$((REQUESTS / 8)) --test=cpu run &>/dev/null &) & done for i in $LITTLES; do sysbench --max-requests=$REQUESTS --test=cpu run \ | grep "total time:" & done wait ----------->8-------------------- It is a bit old EAS but maybe you can find something useful in this fixes or test scenario. Regards, Lukasz Luba Lukasz Luba (5): arm64: exynos: Add support of exynos5433 to EAS with energy model v1 trace: sched: add new trace events for tracking migrations sched/fair: drop aggressive migration sched/fair: change migration destination based on CPU utilization sched/fair: change finding idle group arch/arm64/boot/dts/exynos/exynos5433.dtsi | 8 ++ arch/arm64/kernel/energy_model.h | 119 +++++++++++++++++++ include/trace/events/sched.h | 130 +++++++++++++++++++++ kernel/sched/fair.c | 112 +++++++++++++++--- 4 files changed, 351 insertions(+), 18 deletions(-) -- 2.17.1

6 years

[Integration Branch] Update 07-June-2019

by Dietmar Eggemann

Hi, A new EAS integration branch eas/next/integration is available on http://linux-arm.org/git?p=linux-power.git . For further information about main features, test coverage and work items for next integration have a look at: https://developer.arm.com/tools-and-software/open-source-software/linux-ker… . Best Regards, -- Dietmar

6 years

Questions about per-task utilization clamping (uclamp)

by Zhifei Yang (Arm Technology China)

(Post the questions here on behalf of Yun Hsiang) Hi all, I’d like to ask discuss some questions about uclamp in linux-power.git<http://www.linux-arm.org/git?p=linux-power.git;a=summary>. Code is based on the following version. linux-power.git<http://www.linux-arm.org/git?p=linux-power.git;a=summary> tag: topic-util_clamp-20190412 1. If a task clamped utilization is higher than a cpu capacity, should EAS bypass that cpu? kernel/sched/fair.c static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu) { … /* Skip CPUs that will be overutilized. */ util = cpu_util_next(cpu, p, cpu); <= Should this util use task clamped utilization? cpu_cap = capacity_of(cpu); if (cpu_cap * 1024 < util * capacity_margin) continue; … } 1. Will uclamp add a kernel-space API to set per-task utilization clamping? Drivers/kernel module can use this API for precise performance/power tuning. Best regards, Yun IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

6 years, 1 month

[Query]About LISA

by Cheng-Chang Chang

Hi Linaro, I am really intrested in LISA... and may I ask some question about it? on github https://github.com/ARM-software/lisa and PDF https://developer.arm.com/-/media/developer/developers/open-source/energy-a… P.43 I just read and download the source code and try to test my android phone... however, I could not understand "Slack"'s definition in code. === Thus two types of test failures can result from these tests: 1. test_task_placement asserts that the placement was energy efficient. In a big.LITTLE system, if a low-utilisation task was placed on a big CPU then this test should be expected to fail. *2. test_slack asserts that the required bandwidth was provided. In a big.LITTLE system if a high-utilization task was placed on a LITTLE CPU then this test should be expected to fail.* === I run generic.py and can see sometimes "Slack" is negative and sometimes is positive... Negative > test failed, positive > test pass... === How to define this SLACK + or -...? I cannot understand... ==== Besides, Could I judge my algorithm is worse or better about power efficient by hikey_energy.py & est_power = self.get_power_df(experiment) est_energy = area_under_curve(est_power.sum(axis=1), method='rect (I don't have energy meter.... so.. I can just est by EM. Ofcause, I will design a power for xxx_energy.py) Really appreciate for your help. I want to write a report and see this module is so excited. Best, CCC

6 years, 1 month

[Integration Branch] Update 03-May-2019

by Dietmar Eggemann

6 years, 1 month

[Integration Branch] Update 03-May-2019

by Dietmar Eggemann

6 years, 1 month

IoT Customers Marketing Contact Information

by angie.campos＠craftinsoft.com

<div dir="ltr"><div dir="ltr"><div>Hi,</div><div><br></div><div>I guess this is the appropriate time for you to target Competitors IoT Install Base with Service Providers/Partners/Resellers as for your strategic marketing and channel opportunities for 2019.</div><div><br></div><div>We also have distinctive Types Of development customers like: IBM IoT Users, AWS IoT Users, Cisco IoT Users, Prophet IoT Users , SAP IoT Users , Siemens IoT Users , PTC IoT Users, Autodesk IoT Users, Salesforce IoT Users </div><div><br></div><div>Kindly review and let me know if we can connect or let me know if I can share more insights on this.</div><div><br></div><div>Await your response!</div><div><br></div><div>Warm Regards</div><div>Angie Campos</div><div>Demand Generation</div><div><br></div><div><br></div><div><br></div><div>If you don't want to include yourself in our mailing list, please reply back “Leave Out"" in a subject line"</div><div><br></div></div></div> <p> </p><a style='display: block; margin: 32px 0 40px 0; padding: 10px; font-size: 1em; text-align: center; border: 0; border-top: 1px solid gray; ' href='chrome.google.com/webstore/detail/gsm-mailmerge/fjimadonilpeknihlnnkbgmlmjn…'>powered by GSM. Free mail merge and email marketing software for Gmail.</a>

6 years, 2 months

[Integration Branch] Update 12-Apr-2019

by Dietmar Eggemann

6 years, 2 months

Re: [Eas-dev] M27500-22SB1T23-9-9 16400FT Container

by SHAANXIEng LLC

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6 years, 3 months

Re: [Eas-dev] FINS/1819/NSK/PO438 Confirmed

by WESMEC ENGINEERING PVT.LTD

Dear Sir, With reference to your PO NO. FINS/1819/NSK/PO438, the material is ready at our work. Please find attached herewith Proforma invoice for your reference. You are requested to please make the payment so that we can proceed further. Thanks & Regards, Ms. Meena Chavan, Account’s Manager - 8097070830 WESMEC ENGINEERING PVT.LTD

6 years, 3 months

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