• Viresh Kumar's avatar
    cpufreq: Call transition notifier only once for each policy · df24014a
    Viresh Kumar authored
    Currently, the notifiers are called once for each CPU of the policy->cpus
    cpumask. It would be more optimal if the notifier can be called only
    once and all the relevant information be provided to it. Out of the 23
    drivers that register for the transition notifiers today, only 4 of them
    do per-cpu updates and the callback for the rest can be called only once
    for the policy without any impact.
    
    This would also avoid multiple function calls to the notifier callbacks
    and reduce multiple iterations of notifier core's code (which does
    locking as well).
    
    This patch adds pointer to the cpufreq policy to the struct
    cpufreq_freqs, so the notifier callback has all the information
    available to it with a single call. The five drivers which perform
    per-cpu updates are updated to use the cpufreq policy. The freqs->cpu
    field is redundant now and is removed.
    
    Acked-by: David S. Miller <davem@davemloft.net> (sparc)
    Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    df24014a
tsc.c 38.3 KB