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SubjectRe: [PATCH 1/6] vmscan: tracing: Roll up of patches currently in mmotm
On Fri, Jul 30, 2010 at 04:04:42PM +0200, Frederic Weisbecker wrote:
> On Fri, Jul 30, 2010 at 02:36:55PM +0100, Mel Gorman wrote:
> > This is a roll-up of patches currently in mmotm related to stack reduction and
> > tracing reclaim. It is based on 2.6.35-rc6 and included for the convenience
> > of testing.
> >
> > No signed off required.
> > ---
> > .../trace/postprocess/trace-vmscan-postprocess.pl | 654 ++++++++++++++++++++
>
> I have the feeling you've made an ad-hoc post processing script that seems
> to rewrite all the format parsing, debugfs, stream handling, etc... we
> have that in perf tools already.
>

It's an hoc adaption of trace-pagealloc-postprocess.pl which was developed
before the perf scripting report. It's a bit klunky.

> May be you weren't aware of what we have in perf in terms of scripting support.
>

I'm aware, I just haven't gotten around to adapting what the script does
to the perf scripting support. The existance of the script I have means
people can reproduce my results without having to wait for me to rewrite
the post-processing scripts for perf.

> First, launch perf list and spot the events you're interested in, let's
> say you're interested in irqs:
>
> $ perf list
> [...]
> irq:irq_handler_entry [Tracepoint event]
> irq:irq_handler_exit [Tracepoint event]
> irq:softirq_entry [Tracepoint event]
> irq:softirq_exit [Tracepoint event]
> [...]
>
> Now do a trace record:
>
> # perf record -e irq:irq_handler_entry -e irq:irq_handler_exit -e irq:softirq_entry -e irq:softirq_exit cmd
>
> or more simple:
>
> # perf record -e irq:* cmd
>
> You can use -a instead of cmd for wide tracing.
>
> Now generate a perf parsing script on top of these traces:
>
> # perf trace -g perl
> generated Perl script: perf-trace.pl
>
> Fill up the trace handlers inside perf-trace.pl and just run it:
>
> # perf trace -s perf-trace.pl
>
> Once ready, you can place your script in the script directory.
>

Ultimately, the post-processing scripts should be adapted to perf but it
could be a while before I get around to it.

--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab


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