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 The card is being reworked to split the work that is completed and the ongoing/to be done one. Proposal to be presented to TSC. 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 Also the latest Linaro 13.05 release contains big.LITTLE release with IKS code integrated. By default MP is used (IKS is off). To enable IKS: echo 1 > /sys/kernel/bL_switcher/active 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-20130524.0 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-20130524.0 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: - A python script to download LAVA bundle and extract results and populate results on to given Google spreadsheet is complete and is in use. Blueprint Updates ------------------ * https://blueprints.launchpad.net/linaro-big-little-system/+spec/big-little-mp-integration-tree Ongoing work. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/small-task-packing-in-scheduler - new version is being worked on - a comparison shows that pst-v4 provides the best results: https://lkml.org/lkml/2013/5/30/257 * https://blueprints.launchpad.net/linaro-big-little-system/+spec/cpu-hot-plug-latency - done. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/sched-cooperation-with-dvfs - No resources available (resource is being moved to the other team). - To be discussed on the next OPSCOM. QA == * https://blueprints.launchpad.net/linaro-qa/+spec/prepare-iks-testing-code-to-detect-cpu-topology - Done. - Testing done on VE TC2 using different CPU topologies in DT. big.LITTLE MP LAVA Dashboard http://validation.linaro.org/lava-server/dashboard/image-reports/linaro-android_vexpress-linaro-mp Testing (week 22): 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/016006.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 - reproduced on ARM side, waiting for HW engineers to become available (next week) to continue investigation. - seems to be related to MMC being in use (switching to USB stick can be used as a reliable workaround). -- 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
