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    SubjectRe: [PATCH V5 2/2] tracing, perf : add cpu hotplug trace events
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    On Thu, 2011-02-24 at 18:33 +0100, Vincent Guittot wrote:

    > The goal is to measure the latency of each part (kernel, architecture)
    > and also to trace the cpu hotplug activity with other power events. I
    > have tested these traces events on an arm platform.

    > this patch adds new events for cpu hotplug tracing
    > * plug/unplug sequence
    > * core and architecture latency measurements

    Aside of the points tglx made, I do have to ask _WHY_!?

    Anybody who is interested in the latency of cpu hotplug is deluding
    himself, also cpu hotplug is _NOT_ a power management feature, so the
    rest of your justification just disappeared as well.




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