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

KOSAKI Motohiro
2009-08-05T03:07:13Z

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.
-