linux-kernel - Re: [PATCH] perf: make perf.data more self-descriptive (v5)

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Message-ID: <CABPqkBSpqNWJVhRh4bKRK5PGcCdZhzsJzyeQ53Mh4_7fVUm+wg@mail.gmail.com>
Date:	Fri, 23 Sep 2011 11:04:05 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com,
	peterz@...radead.org, mingo@...e.hu, dsahern@...il.com,
	robert.richter@....com, ak@...ux.intel.com
Subject: Re: [PATCH] perf: make perf.data more self-descriptive (v5)

On Fri, Sep 23, 2011 at 10:03 AM, Pekka Enberg <penberg@...helsinki.fi> wrote:
> Hi Stephane!
>
> On Fri, Sep 23, 2011 at 10:31 AM, Stephane Eranian <eranian@...gle.com> wrote:
>>> So how important is this information? The output is going to be somewhat
>>> awkward for very large CPU counts... :-)
>>>
>> It is useful to determine how CPUs share caches for instance.
>> It can get large but large, but the meta-data header is not printed by
>> default, you need to request it with the -I option.
>
> Well, sure but it blocks rest of the interesting information too. It seems to me
> that the CPU information could be truncated to some sane limit by default and
> introduce a command line option for users that really want to see all of it.
>
Ok, so here is a proposal:
- reorder the info so one liners appear first
- display the "truncated" info by default (no option)
- truncated: numa topo, cpu topo, stop after 4 cpus/nodes, print msg
to hint at -I option
- use -I to print the extended header info report

That way we do no introduce two options just for the header information.

How about that instead?
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