Messages in this thread | | | Date | Tue, 04 Aug 2009 14:27:16 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events |
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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.
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