linux-kernel - Re: [PATCH 08/11] perf python: Initialize 'page

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Date:	Thu, 18 Oct 2012 10:58:43 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 08/11] perf python: Initialize 'page_size' variable

Em Thu, Oct 18, 2012 at 10:31:57AM +0900, Namhyung Kim escreveu:
> On Wed, 17 Oct 2012 14:19:44 -0300, Arnaldo Carvalho de Melo wrote:
> > From: Arnaldo Carvalho de Melo <acme@...hat.com>

> > The commit 0c1fe6b:

> >  'perf tools: Have the page size value available for all tools'

> Is that commit in your perf/urgent branch?  I got this:

>     GEN python/perf.so

Ouch, brown paper bag grade stuff detected, I reverted it now in my perf/urgent
branch.

Ingo, I'm on a conference here in Brazil, just pushed this revert to
perf/urgent, up to you if you want to pull from it or apply all the
csets in this branch except for the one reverted:

commit 356712f6e296fdae1edae51b96b485ed830bdc0c
Author: Arnaldo Carvalho de Melo <acme@...hat.com>
Date:   Tue Oct 16 14:51:04 2012 -0300

    perf python: Initialize 'page_size' variable

-----------------------

I'll keep it on my perf/core branch, where it is needed.

Thanks Namhyung!

- Arnaldo

> util/python.c: In function ‘initperf’:
> util/python.c:1018:2: error: ‘page_size’ undeclared (first use in this function)
> util/python.c:1018:2: note: each undeclared identifier is reported only once for each function it appears in
> error: command 'gcc' failed with exit status 1
> cp: cannot stat `python_ext_build/lib/perf.so': No such file or directory
> make: *** [python/perf.so] Error 1
> 
> Adding '#include "util.h"' didn't work.  But manually adding 'extern
> unsigned int page_size;' did.
> 
> Thanks,
> Namhyung
> 
> 
> >
> > Broke the python binding because the global variable 'page_size' is
> > initialized on the main() routine, that is not called when using
> > just the python binding, causing evlist.mmap() to fail because it
> > expects that variable to be initialized to the system's page size.
> >
> > Fix it by initializing it on the binding init routine.
> >
> > Cc: David Ahern <dsahern@...il.com>
> > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > Cc: Jiri Olsa <jolsa@...hat.com>
> > Cc: Mike Galbraith <efault@....de>
> > Cc: Namhyung Kim <namhyung@...il.com>
> > Cc: Paul Mackerras <paulus@...ba.org>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Stephane Eranian <eranian@...gle.com>
> > Link: http://lkml.kernel.org/n/tip-vrvp3azmbfzexnpmkhmvtzzc@git.kernel.org
> > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > ---
> >  tools/perf/util/python.c |    2 ++
> >  1 files changed, 2 insertions(+), 0 deletions(-)
> >
> > diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
> > index 9181bf2..a2657fd 100644
> > --- a/tools/perf/util/python.c
> > +++ b/tools/perf/util/python.c
> > @@ -1015,6 +1015,8 @@ PyMODINIT_FUNC initperf(void)
> >  	    pyrf_cpu_map__setup_types() < 0)
> >  		return;
> >  
> > +	page_size = sysconf(_SC_PAGE_SIZE);
> > +
> >  	Py_INCREF(&pyrf_evlist__type);
> >  	PyModule_AddObject(module, "evlist", (PyObject*)&pyrf_evlist__type);
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