On Tue, Sep 25, 2012 at 12:43:54AM +0200, Daniel Lezcano wrote: > With the tegra3 and the big.LITTLE [1] new architectures, several cpus > with different characteristics (latencies and states) can co-exists on the > system. > > The cpuidle framework has the limitation of handling only identical cpus. > > This patch removes this limitation by introducing the multiple driver support > for cpuidle. > > This option is configurable at compile time and should be enabled for the > architectures mentioned above. So there is no impact for the other platforms > if the option is disabled. The option defaults to 'n'. Note the multiple drivers > support is also compatible with the existing drivers, even if just one driver is > needed, all the cpu will be tied to this driver using an extra small chunk of > processor memory. > > The multiple driver support use a per-cpu driver pointer instead of a global > variable and the accessor to this variable are done from a cpu context. > > In order to keep the compatibility with the existing drivers, the function > 'cpuidle_register_driver' and 'cpuidle_unregister_driver' will register > the specified driver for all the cpus. > > The sysfs output for the 'current_driver' is changed when this option is > set by giving the drivers per cpu. > > eg. > cpu0: acpi_idle > cpu1: acpi_idle > Is this allowed? I thought sysfs files can output only 1 line of data? Cheers, Peter. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
