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

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Date:	Wed, 05 Aug 2009 11:07:19 -0400
From:	Valdis.Kletnieks@...edu
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, penberg@...helsinki.fi,
	a.p.zijlstra@...llo.nl, fweisbec@...il.com, rostedt@...dmis.org,
	mel@....ul.ie, lwoodman@...hat.com, riel@...hat.com,
	peterz@...radead.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events

On Tue, 04 Aug 2009 13:18:18 PDT, Andrew Morton said:

> As usual, we're adding tracepoints because we feel we must add
> tracepoints, not because anyone has a need for the data which they
> gather.

One of the strong points of the Solaris 'dtrace' is that the kernel comes
pre-instrumented with zillions of tracepoints, including a lot that don't
seem to have very much application - just so they're already in place in
case you hit some weird issue and need the tracepoint for an ad-crock dtrace
script to debug something.  So when I'm trying to diagnose why my backup
server suddenly got sluggish 3 terabytes into a 5 terabyte backup, and it
looks like some weird fiberchannel issue, I can collect data without having
to reboot to install a tracepoint (which would lose the backup, and possibly
reset the issue or otherwise make it go into hiding).

Just sayin'. :)

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