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    SubjectRe: [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events
    Andrew Morton wrote:
    > 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?

    Mel's tracing is more akin to BSD process accounting,
    where these statistics are kept on a per-process basis.

    Nothing in /proc allows us to see statistics on a per
    process basis on process exit.

    --
    All rights reversed.


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