Vincent, On Tue, Jun 12, 2012 at 2:02 PM, Vincent Guittot <vincent.guit...@linaro.org> wrote: > Use cpu compatibility field and clock-frequency field of DT to > estimate the capacity of each core of the system > > Signed-off-by: Vincent Guittot <vincent.guit...@linaro.org> > --- > arch/arm/kernel/topology.c | 122 > ++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 122 insertions(+) > > diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c > index 2f85a64..0c2aee4 100644 > --- a/arch/arm/kernel/topology.c > +++ b/arch/arm/kernel/topology.c > @@ -17,6 +17,7 @@ > #include <linux/percpu.h> > #include <linux/node.h> > #include <linux/nodemask.h> > +#include <linux/of.h> > #include <linux/sched.h> > > #include <asm/cputype.h> > @@ -47,6 +48,122 @@ void set_power_scale(unsigned int cpu, unsigned long > power) > per_cpu(cpu_scale, cpu) = power; > } > > +#ifdef CONFIG_OF > +struct cpu_efficiency { > + const char *compatible; > + unsigned long efficiency; > +}; > + > +/* > + * Table of relative efficiency of each processors > + * The efficiency value must fit in 20bit. The final > + * cpu_scale value must be in the range [1:2048[. Typo here.
> + * Processors that are not defined in the table, > + * use the default SCHED_POWER_SCALE value for cpu_scale. > + */ > +struct cpu_efficiency table_efficiency[] = { > + {"arm,cortex-a15", 3891}, > + {"arm,cortex-a7", 2048}, How are those results measured or computed? Is this purely related to the number crunching performance? Also more generally what if the cores frequencies are changing? Regards, Jean _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev