On Thu, Jan 28, 2016 at 06:01:43PM +0800, Huang Rui wrote: > For example: Carrizo has four CPU cores and two compute units (CUs). > CPU0 and CPU1 belongs to CU0, CPU2 and CPU3 belongs to CU1. > > At normal initialization, cpu_mask should be "0,2". That means OS > choose CPU0 in CU0 and CPU2 in CU1 to measure the CU0 and CU1's power > consumption. If we make the CPU2 offline at runtime, OS need try to > find another CPU in same compute unit (Here is CU1, only CPU3 can be > picked). Then OS will move on to the CPU3 to measure CU1's power > consumption instead of CPU2.
So basically you want to simply say: "Find another CPU on the same compute unit and set it in the mask of CPUs on which we do the measurements." Which reminds me: that cpu_mask thing is insufficiently named - it should be called measuring_cpus_mask or so. Btw, the kbuild robot errors come from the fact that there are changes to cpufeature.h which I didn't mention when applying your patches. So I've pushed the whole pile here: http://git.kernel.org/cgit/linux/kernel/git/bp/bp.git/log/?h=tip-perf Please use that branch instead. Thanks. -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply.
