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    SubjectRe: [RFD 0/5] Add latency histogram
    Hi Tom,

    On 05/01/2015 01:52 AM, Tom Zanussi wrote:
    > Hi Daniel,
    >
    > On Thu, 2015-04-30 at 12:06 +0200, Daniel Wagner wrote:
    >> Hi,
    >>
    >> I would like to discuss a possible way of getting the feature of the
    >> latecy_hist.patch [1] added to mainline.
    >>
    >> "Latency histograms are primarily relevant in the context of real-time
    >> enabled kernels (CONFIG_PREEMPT/CONFIG_PREEMPT_RT)and are used in the
    >> quality management of the Linux real-time capabilities."
    >>
    >> Steven pointed out that this might be doable based on Tom Zanussi's
    >> "[PATCH v4 0/7] tracing: 'hist' triggers" [2].
    >>
    >> Here are my findings. It was not too complicated to get it working,
    >> though I had to add some hacks. I have added comments to each patch.
    >>
    >
    > It looks like you were able to do quite a bit here with not much code -
    > nice!

    Thanks :)

    > Just FYI, I'll be working on a v5 of the hist triggers patchset that
    > will incorporate the stuff from patch 1 (needs to be split into a
    > separate patch for the triggers code already upstream, and one for hist
    > triggers) and your comments from patch 2 (see comments in my reply to
    > that patch), along with a couple other unrelated changes...

    Great to hear!

    cheers,
    daniel



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