Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing
script for page-allocator-related ftrace events
[Posted August 11, 2009 by corbet]
| From: |
| Andrew Morton <akpm-AT-linux-foundation.org> |
| To: |
| Ingo Molnar <mingo-AT-elte.hu> |
| Subject: |
| Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing
script for page-allocator-related ftrace events |
| Date: |
| Tue, 4 Aug 2009 13:18:18 -0700 |
| Cc: |
| penberg-AT-cs.helsinki.fi, a.p.zijlstra-AT-chello.nl, fweisbec-AT-gmail.com,
rostedt-AT-goodmis.org, mel-AT-csn.ul.ie, lwoodman-AT-redhat.com,
riel-AT-redhat.com, peterz-AT-infradead.org, linux-kernel-AT-vger.kernel.org,
linux-mm-AT-kvack.org |
On Tue, 4 Aug 2009 21:57:17 +0200
Ingo Molnar <mingo@elte.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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