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    SubjectRe: [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events
    On Tue,  4 Aug 2009 19:12:26 +0100 Mel Gorman <mel@csn.ul.ie> wrote:

    > This patch adds a simple post-processing script for the page-allocator-related
    > trace events. It can be used to give an indication of who the most
    > allocator-intensive processes are and how often the zone lock was taken
    > during the tracing period. Example output looks like
    >
    > find-2840
    > o pages allocd = 1877
    > o pages allocd under lock = 1817
    > o pages freed directly = 9
    > o pcpu refills = 1078
    > o migrate fallbacks = 48
    > - fragmentation causing = 48
    > - severe = 46
    > - moderate = 2
    > - changed migratetype = 7

    The usual way of accumulating and presenting such measurements is via
    /proc/vmstat. How do we justify adding a completely new and different
    way of doing something which we already do?


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