Adding John Rigby here. On 11 Jul 12, Amit Kucheria wrote: > From: Vincent Guittot <vincent.guit...@linaro.org> > > (Patch accepted by Russell for 3.1: > http://www.spinics.net/lists/arm-kernel/msg131273.html) > > > +config ARM_CPU_TOPOLOGY > + bool "Support cpu topology definition" > + depends on SMP && CPU_V7 > + default y > + help > + Support ARM cpu topology definition. The MPIDR register defines > + affinity between processors which is then used to describe the cpu > + topology of an ARM System. > + > +config SCHED_MC > + bool "Multi-core scheduler support" > + depends on ARM_CPU_TOPOLOGY > + help > + Multi-core scheduler support improves the CPU scheduler's decision > + making when dealing with multi-core CPU chips at a cost of slightly > + increased overhead in some places. If unsure say N here. > + > +config SCHED_SMT > + bool "SMT scheduler support" > + depends on ARM_CPU_TOPOLOGY > + help > + Improves the CPU scheduler's decision making when dealing with > + MultiThreading at a cost of slightly increased overhead in some > + places. If unsure say N here. > +
Can you please enable these Kconfig options in our configs? By default SCHED_MC/SMT expose a /sys interface and are disabled by default (0). Possible values are: 0 - No power saving load balance (default value) 1 - Fill one thread/core/package first for long running threads 2 - Also bias task wakeups to semi-idle cpu package for power savings See Documentation/ABI/testing/sysfs-devices-system-cpu for details. This will make it easy to turn on for folks that are interested (by writing 2 to /sys/devices/system/cpu/sched_mc_power_savings) Regards, Amit _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
