Currently we call the cpufreq transition notifiers once for each CPU of the policy->cpus cpumask, which isn't that efficient. This patchset tries to simplify that by adding another field in struct cpufreq_freqs, cpus, so the callback has all the information available with a single call for each policy. I have tested this on arm64 platform and is compile tested for other platforms. This has gone through 0-day testing as well, I have pushed my branch over a week back to the public tree which gets tested by 0-day bot. FWIW, it maybe possible to make the callback implementation more efficient now that they are called only once for each policy, but this patchset only did the minimum amount of changes to make sure we don't end up breaking otherwise working code. -- viresh Viresh Kumar (7): cpufreq: Pass policy->related_cpus to transition notifiers ARM: smp: Update cpufreq transition notifier to handle multiple CPUs ARM: twd: Update cpufreq transition notifier to handle multiple CPUs sparc64: Update cpufreq transition notifier to handle multiple CPUs x86/tsc: Update cpufreq transition notifier to handle multiple CPUs KVM: x86: Update cpufreq transition notifier to handle multiple CPUs cpufreq: Call transition notifiers only once for each policy arch/arm/kernel/smp.c | 23 ++++++++++++++--------- arch/arm/kernel/smp_twd.c | 9 ++++++--- arch/sparc/kernel/time_64.c | 28 ++++++++++++++++------------ arch/x86/kernel/tsc.c | 31 ++++++++++++++++++++----------- arch/x86/kvm/x86.c | 31 ++++++++++++++++++++----------- drivers/cpufreq/cpufreq.c | 19 ++++++++++--------- include/linux/cpufreq.h | 2 +- 7 files changed, 87 insertions(+), 56 deletions(-) -- 2.21.0.rc0.269.g1a574e7a288b
