linux-kernel - Re: [PATCH 2/4] perf: jevents: Program to convert JSON file to C style file

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Message-ID: <CAM9d7cgSPbBgHL8qkmFEfbA3pNct4VPaxDwOcKZD3_5ZNL-oNQ@mail.gmail.com>
Date:	Wed, 27 May 2015 23:59:04 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] perf: jevents: Program to convert JSON file to C
 style file

Hi Andi,

On Wed, May 27, 2015 at 11:40 PM, Andi Kleen <ak@...ux.intel.com> wrote:
>> So we build tables of all models in the architecture, and choose
>> matching one when compiling perf, right?  Can't we do that when
>> building the tables?  IOW, why don't we check the VFM and discard
>> non-matching tables?  Those non-matching tables are also needed?
>
> We build it for all cpus in an architecture, not all architectures.
> So e.g. for an x86 binary power is not included, and vice versa.

OK.

> It always includes all CPUs for a given architecture, so it's possible
> to use the perf binary on other systems than just the one it was
> build on.

So it selects one at run-time not build-time, good.  But I worry about
the size of the intel tables.  How large are they?  Maybe we can make
it dynamic-loadable if needed..

Thanks,
Namhyung
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