Dear all, > Despite this patch set is working and applicable on top of 3.14-rc5, > please regard it solely as a pure RFC. > > This patch provides support for LAB governor build on top of ondemand. > Previous version of LAB can be found here: > http://thread.gmane.org/gmane.linux.kernel/1484746/match=cpufreq > > LAB short reminder: > > LAB uses information about how many cores are in "idle" state (the > core idleness is represented as the value between 0 and 100) and the > overall load of the system (from 0 to 100) to decide about frequency > to be set. It is extremely useful with SoCs like Exynos4412, which > can set only one frequency for all cores. > > Important design decisions: > > - Reuse well established ondemand governor's internal code. To do this > I had to expose some previously static internal ondemand code. > This allowed smaller LAB code when compared to previous version. > > - LAB works on top of ondemand, which means that one via device tree > attributes can specify if and when e.g. BOOST shall be enabled or > if any particular frequency shall be imposed. For situation NOT > important from the power consumption reduction viewpoint the ondemand > is used to set proper frequency. > > - It is only possible to either compile in or not the LAB into the > kernel. There is no "M" option for Kconfig. It is done on purpose, > since ondemand itself can be also compiled as a module and then it > would be possible to remove ondemand when LAB is working on top of it. > > - The LAB operation is specified (and thereof extendable) via device > tree lab-ctrl-freq attribute defined at /cpus/cpu0. > > > Problems: > - How the governor will work for big.LITTLE systems (especially > Global Task Scheduling). > - Will there be agreement to expose internal ondemand code to be > reused for more specialized governors. > > Test HW: > Exynos4412 - Trats2 board. > Above patches were posted on top of Linux 3.14-rc5 > (SHA1: 3f9590c281c66162bf8ae9b7b2d987f0a89043c6) > Any comments about those patches? > Lukasz Majewski (5): > cpufreq:LAB:ondemand Adjust ondemand to be able to reuse its methods > cpufreq:LAB:cpufreq_governor Adjust cpufreq_governor.[h|c] to > support LAB > cpufreq:LAB:lab Add LAB governor code > cpufreq:LAB:Kconfig Add LAB definitions to Kconfig > cpufreq:LAB:dts:trats2: Add DTS nodes for LAB governor > > arch/arm/boot/dts/exynos4412-trats2.dts | 29 ++ > drivers/cpufreq/Kconfig | 28 ++ > drivers/cpufreq/Makefile | 1 + > drivers/cpufreq/cpufreq_governor.c | 7 + > drivers/cpufreq/cpufreq_governor.h | 12 + > drivers/cpufreq/cpufreq_lab.c | 457 > +++++++++++++++++++++++++++++++ > drivers/cpufreq/cpufreq_ondemand.c | 24 +- 7 files changed, > 550 insertions(+), 8 deletions(-) create mode 100644 > drivers/cpufreq/cpufreq_lab.c > -- Best regards, Lukasz Majewski Samsung R&D Institute Poland (SRPOL) | Linux Platform Group -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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