Messages in this thread | | | Date | Wed, 13 Jun 2012 10:59:25 +0200 | Subject | Re: [RFC 3/4] ARM: topology: Update cpu_power according to DT information | From | Jean Pihet <> |
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Vincent,
On Tue, Jun 12, 2012 at 2:02 PM, Vincent Guittot <vincent.guittot@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.guittot@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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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