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

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Date:	Thu, 28 May 2015 13:52:23 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Andi Kleen <ak@...ux.intel.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	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

On Wed, May 27, 2015 at 11:59:04PM +0900, Namhyung Kim wrote:
> 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..

just compiled Sukadev's new version with Andi's events list
and stripped binary size is:

[jolsa@...va perf]$ ls -l perf
-rwxrwxr-x 1 jolsa jolsa 2772640 May 28 13:49 perf


while perf on Arnaldo's perf/core is:

[jolsa@...va perf]$ ls -l perf
-rwxrwxr-x 1 jolsa jolsa 2334816 May 28 13:49 perf


seems not that bad

jirka
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