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

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Message-ID: <CABPqkBQSBKS+bnLhStzV4PTrE+Qrb1XyeR5FEyn4d+NFZrhuOQ@mail.gmail.com>
Date:	Fri, 23 Sep 2011 09:31:04 +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 8:40 AM, Pekka Enberg <penberg@...helsinki.fi> wrote:
> On Thu, Sep 22, 2011 at 3:31 PM, Stephane Eranian <eranian@...gle.com> wrote:
>> # CPU0 sibling cores  : 0-3
>> # CPU0 sibling threads: 0
>> # CPU1 sibling cores  : 0-3
>> # CPU1 sibling threads: 1
>> # CPU2 sibling cores  : 0-3
>> # CPU2 sibling threads: 2
>> # CPU3 sibling cores  : 0-3
>> # CPU3 sibling threads: 3
>> # total memory: 8093212 kB
>> # cpuid : GenuineIntel,6,15,11
>
> 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.
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