Searched hist:ac9816dc (Results 1 – 1 of 1) sorted by relevance
/openbmc/linux/arch/powerpc/platforms/powernv/ |
H A D | idle.c | ac9816dc Wed May 16 07:02:14 CDT 2018 Akshay Adiga <akshay.adiga@linux.vnet.ibm.com> powerpc/powernv/cpuidle: Init all present cpus for deep states
Init all present cpus for deep states instead of "all possible" cpus. Init fails if a possible cpu is guarded. Resulting in making only non-deep states available for cpuidle/hotplug.
Stewart says, this means that for single threaded workloads, if you guard out a CPU core you'll not get WoF (Workload Optimised Frequency), which means that performance goes down when you wouldn't expect it to.
Fixes: 77b54e9f213f ("powernv/powerpc: Add winkle support for offline cpus") Cc: stable@vger.kernel.org # v3.19+ Signed-off-by: Akshay Adiga <akshay.adiga@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> ac9816dc Wed May 16 07:02:14 CDT 2018 Akshay Adiga <akshay.adiga@linux.vnet.ibm.com> powerpc/powernv/cpuidle: Init all present cpus for deep states Init all present cpus for deep states instead of "all possible" cpus. Init fails if a possible cpu is guarded. Resulting in making only non-deep states available for cpuidle/hotplug. Stewart says, this means that for single threaded workloads, if you guard out a CPU core you'll not get WoF (Workload Optimised Frequency), which means that performance goes down when you wouldn't expect it to. Fixes: 77b54e9f213f ("powernv/powerpc: Add winkle support for offline cpus") Cc: stable@vger.kernel.org # v3.19+ Signed-off-by: Akshay Adiga <akshay.adiga@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|