linaro-kernel

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10094 discussions

[ACTIVITY] (Anton Vorontsov) 2012-04-30 - 2012-05-04

by Anton Vorontsov

== Highlights == * Prepared some new features for vmevent: - a new low-memory blended attribute. This is used to wisely account page cache. The feature triggered a big discussion, so we might end up with something different as the discussion is still ongoing; - 'equal-to' attribute state (this is merged already); * Never-ending discussion on memcg and vmevents memory notifications continued; * ram_console feature seemed quite interesting, so I started looking more closely into it. Based on previous lkml discussions, it appears that the main obstacle is that we should use pstore. So, as a warm-up I started porting ramoops (which uses pstore in -next tree) driver to use persistent_ram. That would be a good reason to move persistent_ram out of staging/. * v3.4 is approaching rc7 (or final), so I had to dedicate some time for a pile of battery patches collected in my 'todo' mailbox. == Plans == * Pekka asked to look into improving LT/GT/EQ handling in vmevent, make it table-based may be; * I was quite reluctant to getting my hands dirty into the cpufreq as nobody likes it, and thus I'm risking to get involved into another never-ending story, plus after refreshing Android git tree I noticed that Android guys are actively hacking it at this precise moment. So, to not step on each others' toes, I finally decided I'd better work on something else, thus I picked ram_console and friends. -- Anton Vorontsov Email: cbouatmailru(a)gmail.com

12 years, 12 months

[ACTIVITY] (Deepak Saxena) April 29th - May 5th

by Deepak Saxena

== Deepak Saxena <dsaxena> == (Took last Monday and Tuesday off to deal with some house issues) === Highlights === * Finalized list of introductory training at Connect: Upstreaming 101: How and Why of Getting Code Accepted into the kernel (Deepak S.) Git 101: Using Git for kernel development (Matt W.) ARM SOC Tree: Advice on doing a new platform or SOC port the right way (Arnd B.) Device Tree Intro: How and why of using DT (Thomas A.) Pin Mux/Pin Control: How to develop a driver, overview of API (Linus W.) * Connect session planning === Plans === * Sync up with interested parties (Dave R., Jon M., Leif L.) on Enterprise kernel sessions * Google Hangout on Air interview for marketing/outreach of Connect training sessions. * Continue Connect session planning: creating detailed outlines, coordinating facilitators, slides, etc... * Continue looking at/brain-storming about different methods for tracking work. * Usual 1:1's and meetings === Issues === * None at the time === Travel/Time Off === * May 22nd - June 12th: Austin to sync up with Mounir and Rob Herring Linaro Connect Few days of vacation in Beijing Linux Con Japan A few days of vacation in Tokyo Back Home! * Travel to visit family 7/27 - 8/1. Will be working from CST time zone instead of PST. * Out August 22nd- Sept 5th. Will be in the middle of nowhere and have no connectivity.

12 years, 12 months

[ACTIVITY] (Dong Aisheng) April-30-May-4

by Dong Aisheng

=== Pinctrl === * pinctrl-imx patch series is already merged by Linus. * converted esdhc driver to use pinctrl. merged by Shawn === mxs dt === * sent a patch series to make mxs-dma driver mach-independent and support dt === Plan === * Implement per pin mux and config for pinctrl subsystem * Improve pinctrl gpio support for dt * convert remain imx drivers to use pinctrl * convert mxs driver to support dt

12 years, 12 months

[ACTIVITY] (John Stultz) Apr 30 - May 4

by John Stultz

=== Highlights === * Got further feedback from DaveC on the volatile ranges work. I need to rework the patch significantly to use the falloc interface instead of fadvise in order to allow the functionality to be more generic and implementable on a per-filesystem basis (as there are lots of fs specific tricks that can be used). Despite his insistence that I rework it, he did say that he was interested in seeing the functionality added, since he has some ideas for how it can be used w/ xfs. Started the process of figuring out how to refactor the code to be per-fs, ideally without rewriting most of it. * Further review and quite a bit of discussion around community CLOCK_TAI groundwork and improved leapsecond processing. Also got into a big discussion with a researcher on UTC-SLS (smoothed leap second) which allows applications to avoid the nasty leapsecond by smearing it over ~15 minutes. All interesting, but getting both features to not conflict and work together will be interesting. Submitted a example RFC of how I'd like to see CLOCK_TAI implemented. * Wrote up some blueprints for possible future Android related work focusing on debugging technology.https://blueprints.launchpad.net/linux-linaro/+spec/android-debu… * Reported a compile bug w/ omap-usb-host.c caused by a not-so-recent commit. The proper fix was merged shortly there after. * Updated linaro-android-3.4 tree and made a few corrections at Andrey's request. === Plans === * Continue reworking volatile ranges to use fadvise. * Will be on vacation from May 9th-16th. === Issues === NA

13 years

[ACTIVITY] (Linus Walleij) 2012-04-28 - 2012-05-05

by Linus Walleij

== Linus Walleij linusw == === Highlights === * Brought ux500 pinctrl forward, trying to find a smooth transition from the existing codebase to a pinctrl-based approach. This is taking some time since it requires quite a bit of upfront code. Patches can be expected next week. * Iterated/split the ux500 pull requests for the next merge window, now in place and being boiled in -next after a minor screwup with Lee's devicetree patches. * Russell accepted some patches, especially the multiirq and irqdomain patch for the FPGA IRQ controller. * Discussing power domain issues. === Plans === * Convert ux500 (gpio-nomadik) to pinctrl for the kernel 3.5 timeframe. * Review incoming pinctrl patches. * Test the PL08x patches on the Ericsson Research PB11MPCore and submit platform data for using pl08x DMA on that platform. * Look into other Ux500 stuff in need of mainlining... like - Ux500 clocks (looks like a new assignee might look into this) - the HWMON stuff. === Issues === * Children got chickenpox, back at work a constant line of people and mail make it hard to get work done at times. Thanks, Linus Walleij

13 years

[PATCH v2 0/2] vmevent: Greater-than attribute + one-shot mode + a bugfix

by Anton Vorontsov

Hi all, That's a respin of the previous patchset that tried to add a new 'cross' event type, which would trigger whenever value crosses a user-specified threshold both ways, i.e. from a lesser values side to a greater values side, and vice versa. We use the event type in an userspace low-memory killer: we get a notification when memory becomes low, so we start freeing memory by killing unneeded processes, and we get notification when memory hits the threshold from another side, so we know that we freed enough of memory. There's also a fix for a bug that makes kernel upset about sleeping in the atomic context. Per Pekka's comments here comes v2. Changes: - Added a one-shot mode plus a greater-than attribute, the two additions makes the equivalent of the cross-event type. - In the bugfix patch I added some comments about implementation details of the lock-free logic. Also, in the previous version of the fix I forgot to remove 'struct mutex' form the 'struct vmevent_watch', this is now cleaned up. As usual, the patches are against git://github.com/penberg/linux.git vmevent/core Thanks! -- Anton Vorontsov Email: cbouatmailru(a)gmail.com

13 years

[Activity] (Omar Ramirez) Apr 16 - Apr 29

by Omar Ramirez Luna

== Omar Ramirez <omarrmz> == === Highlights === * Thread switching for bl-agitator, completed - Added the feature for Android and Ubuntu/minimal fs. * Resent: Iommu: OMAP: device detach on domain destroy - Rebased to 3.4-rc2. * Fixed dspbridge compilation break because of OMAP_L2_IO_ADDRESS macro. * Tested Linaro kernel with DT - Had to use 3.3 tilt as latest was unstable due to ongoing changes. - It does accept DT. * Internal (TI) training for tidspbridge from how to boot to test execution. * tidspbridge: debugged dsp binaries since latest kernels have been throwing L3 warnings when loading a static baseimage. - It turned out to be changes in gpio uncovered a bug in the code present in d.o-z, since it was accessing a gpio in the first bank while in retention. - Fixed and uploaded new exports. - Removed precompiled binaries from d.o-z - Fixed userspace samples build since a variable was being overriden. * Maiblox DT rebased latest rc and cleaned up. (Minor cleanups and retested in OMAP4) - Needs testing in OMAP3. === Planned === * Test mailbox DT in OMAP3 and send to LO. * debugfs interface for big.LITTLE to know which cluster is being used. * bl-agitator refactoring and cleanup, if possible. * Rebase iommu hwmod one more time. - Add reset handling for linux-omap. * Iommu DT

13 years

[ACTIVITY] (Shawn Guo) Week of Apr 23

by Shawn Guo

=== Highlights === * Addressed the comments that Mike and Sascha put on mxs common clk series v1 and sent v2 based on Mike's clk-next branch, and expect it go through arm-soc with Russell's clkdev and Mike's clk core pull into arm-soc as dependencies. * Had an extensive discussion with Dong Aisheng on imx and mxs pinctrl binding and eventually agreed that we do not have to push for the same binding as the controller between two architecture is so different. Reviewed and acked pinctrl-imx v2 from Dong. Sent pinctrl-mxs v2 with binding document improved and one small comment from Stephen addressed. * Reviewed imx5/6 cpuidle series from Rob Lee. We, including Sascha and Russell agreed that instead of detecting soc type in a global late_initcall call, a machine specific late_initcall time hook should be added into "struct machine_desc" to do late init. But Russell requires the patch series introducing the hook should convert all existing late_initcall in arch/arm/mach-* to use this hook. Sent a series to do this which actually is part single kernel work. -- Regards, Shawn

13 years

[ACTIVITY] ... for the last 2 months (!)

by Nicolas Pitre

[ Yeah OK... I'm really bad with this stuff. ] January 23 to FEbruary 03 - More on-going study of the standalone b.L switcher code. - Discussion with Le.chi Thu, Paul Larson and others about big.LITTLE switcher testing requirements. - Involved in the review cycle for a patch about the new generic ioremap optimization from Pawel Moll which turned out to be bad and needed a subsequent revert. - Obtaining and setting up the b.L Fast Model license. - Review of some RCU changes pushed down the platform idle code path by Paul E. McKenney which I ended up NAKing. - Review of a patch from Stephen Boyd to disable preemption when reading CCSIDR on ARMv7 to which I suggested a simpler alternative. - Review of the initial test plan for the big.LITTLE switcher. - REview of the SA11x0 cleanups from RMK. - Investigation and prodding sent to Andrew Lunn for fixing a few Kirkwood breakages from recent consolidation changes. - More design discussions around b.L switcher with people from ARM Ltd, notably Robin Randhawa. - Preparing for Linaro Connect. February 06 to 10 - Attending Linaro Connect. - REview of Rob Herring's series cleaning up and removing IRQ and FIQ related macros from the kernel. - Wrote an article about big.LITTLE switcher for LWN. - REview of Marc Zyngier's series to add per SoC SMP and CPU hotplug operations. - Quickstart session with Dave Martin to run the ARM Fast Model for b.L. February 13 to 24 - Refinement to my LWN article about b.L before publication. - Review of a patch series preparing the kernel for being entered in hypervisor mode by Dave Martin. - Discussion (on IRC) between Dave Martin and myself about design changes brought to the in-kernel b.L switcher. - Start experimenting with the b.L fast model. - Read and digested various documents about the ARM virtualization, the GIC, etc. - Produced some b.L project status to help project management transition from Usman to Mounir. - Posted a patch to add support for early console output via semihosting. - Wrote the first part of the big.LITTLE write-up for the monthly member report (Paul McKenney did the second part). February 27 to March 02 - Away on vacation. March 05 to 16 - Review of the initial Kirkwood conversion to FDT by jason(a)lakedaemon.net. - Review of a patch series removing most instances of io.h by Rob Herring. - Comments/suggestions on how to deal with unresponsive maintainers, prompted by Amit Kucheria. - Review of a patch by Stephen Warren to generalize u-Boot's uImage wrapping in the kernel build. - More experiments with the b.L software model, attempting to boot a 8-core SMP system, running into cross cluster cache coherency problems. Finally get it to boot, thanks to the ARM guys who provided the missing clue. - Look at the multi-cluster aware boot protocol patches by Lorenzo Pieralisi. Some of it might be directly useful for the b.L switcher. - Review of Dave Martin's patch series to facilitate custom opcode injection. - Improved a patch I posted months ago to remove the debugging restrictions inside the devicemaps_init() function and pushed upstream. REcent changes to the kernel are making this patch very useful for people to debug their own kernel. - Quick review of the Cortex-M3 support by Uwe Kleine-König. - Moved to the arm-soc tree to implement the in-kernel switcher as it contains everything to boot a vexpress config with device tree on the software model. Nicolas

13 years

[ACTIVITY] (Dong Aisheng) April-23- April-27

by Dong Aisheng

=== Pinctrl === * sent out pinctrl core add defer probe for gpio patch, merged by Linus. * sent out pinctrl-imx v4 series patch Already got Stephen Warren and Shawn Guo's ack. No more comments for a few days. I assume Linus Walleij may pick it up soon. * Implement a common API to handle pinctrl dummy state, merged by Linus. * Reviewed some other pinctrl patches. * Implement per pin mux and config for pinctrl subsystem. INPROGRESS === Plan === * send out a draft pinctrl per pin mux and config patch and discuss it with Linus and Stehpen. * since the gpio base is dynamically allocated from DT, the exist pinctrl gpio support implementation based on fixed gpio base map may not fit any more with DT. Will think more about the solution and discuss it with Linus.

13 years

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