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    SubjectRe: [PATCH] trace power_frequency events on the correct cpu (for Intel x86 CPUs)
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    Am Dienstag, den 23.03.2010, 09:58 -0700 schrieb Arjan van de Ven:
    > On 3/23/2010 9:57, Thomas Renninger wrote:
    > > On Tuesday 23 March 2010 17:28:36 Robert Schöne wrote:
    > >> Am Montag, den 22.03.2010, 06:57 -0700 schrieb Arjan van de Ven:
    > >>> On 3/22/2010 0:04, Robert Schöne wrote:
    > >>>> Am Sonntag, den 21.03.2010, 17:42 -0700 schrieb Arjan van de Ven:
    > >>>>> On 3/20/2010 14:37, Thomas Renninger wrote:
    > >>>>>
    > >>>>>> It also seem to be (hopefully) a minor feature for timechart, so this should
    > >>>>>> not hurt that much (yet).
    > >>>>>
    > >>>>> It's actually a major feature for timechart, and one of the key things I and a bunch of others
    > >>>>> inside Intel use timechart for.
    > >>>>>
    > >>>> It's a major feature for us too.
    > >>>> I suppose, the cpufreq_notify_transition calls are correct (meaning
    > >>>> being called for all related cpus) for every driver. So there's still
    > >>>> the option to include it in the POST_CHANGE section of this function.
    > >>>> Could this be okay for the both of you?
    > >>>
    > >>> post change would work... that gets frequency afaik..
    > >> Are you ok with this too, Thomas?
    > > You mean hooking it into cpufreq_stat_notifier_trans() in
    > > drivers/cpufreq/cpufreq_stats.c?
    >
    > no
    >
    >
    > hooking into the post frequency change callback that gets done..
    > which is guaranteed to be on the right cpu afaics.
    >
    I don't see where this would be guaranteed. So I'd be fine with
    a) adding it to
    cpufreq.c/cpufreq_notify_transition/cpufreq_notify_transition

    b) adding an item to the cpufreq_transition_notifier_list

    c) adding it to cpufreq_stats.c/cpufreq_stat_notifier_trans

    which would imply the usage of smp_call_function_single(...)


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