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

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Message-Id: <20090804131818.ee5d4696.akpm@linux-foundation.org>
Date:	Tue, 4 Aug 2009 13:18:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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, 4 Aug 2009 21:57:17 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> Let me demonstrate these features in action (i've applied the 
> patches for testing to -tip):

So?  The fact that certain things can be done doesn't mean that there's
a demand for them, nor that anyone will _use_ this stuff.

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.

There is some benefit in providing MM developers with some code which
they can copy-n-paste for their day-to-day activity.  But as I said,
they can do that with vmstat too.

If we can get rid of vmstat all together (and meminfo) and replace all
that with common infrastructure then that would be a good cleanup.  But
if we end up leaving vmstat and meminfo in place and then adding
_another_ statistic gathering mechanism in parallel then we haven't
cleaned anything up at all - it just gets worse.

I don't really oppose the patches - they're small.  But they seem
rather useless too.

It would be nice to at least partially remove the vmstat/meminfo
infrastructure but I don't think we can do that?
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