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    SubjectRe: [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events
    Date
    Hi

    > 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?

    I think this approach have following merit.

    - It can collect per-process information.
    (Of cource, ftrace event filter can filter more various condtion)
    - It can integrate perf-counter easily.
    -






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