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 Development ============ 1. big.LITTLE IKS Current IKS snapshot: git://git.linaro.org/landing-teams/working/arm/kernel.git More information: http://lists.linaro.org/pipermail/linaro-dev/2013-May/015882.html 2. big.LITTLE MP There are two branches, which are functionally equivalent - they tweak the scheduler to select the right processes to move to the A15 and try to decrease power consumption while maintaining performance. * A Reference (stable) big.LITTLE MP patchset (merged with linux-linaro): https://git.linaro.org/gitweb?p=arm/big.LITTLE/mp.git;a=shortlog;h=refs/heads/linux-linaro-MP-reference-20130418 Recommended to be used for testing. * And an upstream (work in progress) big.LITTLE MP patchset: https://git.linaro.org/gitweb?p=arm/big.LITTLE/mp.git;a=shortlog;h=refs/heads/linux-linaro-MP-upstream-20130418 Being worked on in order to achieve the performance/power numbers of the reference one. * Documentation: Code flow is already covered by several LWN articles. See https://wiki.linaro.org/WorkingGroups/PowerManagement/Doc/ in the Articles section. We will provide a tuning guide once we have reached agreement upstream. * Automated benchmarking code is ready: - Workload results automated upload is being worked on. Blueprint Updates ------------------ * https://blueprints.launchpad.net/linaro-big-little-system/+spec/big-little-mp-integration-tree Should be much simpler now. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/cpuidle-add-cpu-specific-states-capability Done. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/small-task-packing-in-scheduler Discussion is ongoing in ML. Testing on a 64 core x86 system is ongoing, results to be available in the next report. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/cpu-hot-plug-latency Unlocked last week. Discussions around data extraction are ongoing. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/sched-cooperation-with-dvfs Long-lasting BP (6+ month to get something), no updates. QA == big.LITTLE MP LAVA Dashboard http://validation.linaro.org/lava-server/dashboard/image-reports/linaro-android_vexpress-linaro-mp Testing (week 19): 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 6 0 100 % mpextendedsuite 20 10 7 3 70 % mploadbalance 2 2 2 0 100 % http://lists.linaro.org/pipermail/linaro-dev/2013-May/015923.html Bugs: https://bugs.launchpad.net/linaro-big-little-system/+bugs?field.tag=bl-mp Highlight: Bug 1166246 - Lockup on post 3.9 IKS kernel - isolated the problem (both A15 CPUs suspended by cpuidle, upon returning the status is not hitting the RAM). - cpuidle is a prerequisite for this issue to happen. - lockup is happening 800+ GHz, lower frequencies are being tested. - Dave Martin has a script that triggers the issue easily. - analysis is ongoing. -- Best Regards, Serge Broslavsky <serge.broslav...@linaro.org> Project Manager, Linaro M: +37129426328 IRC: ototo Skype: serge.broslavsky http://linaro.org | Open source software for ARM SoCs _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
