linux-kernel - Re: [PATCH 05/15 V3] perf, c2c: Rework setup code to prepare for features

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Message-ID: <20140408141107.GT8488@redhat.com>
Date:	Tue, 8 Apr 2014 10:11:07 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, acme@...stprotocols.net,
	LKML <linux-kernel@...r.kernel.org>, jmario@...hat.com,
	fowles@...each.com, peterz@...radead.org, eranian@...gle.com,
	andi.kleen@...el.com
Subject: Re: [PATCH 05/15 V3] perf, c2c: Rework setup code to prepare for
 features

On Tue, Apr 08, 2014 at 04:41:29PM +0900, Namhyung Kim wrote:
> On Sat, 29 Mar 2014 18:10:18 +0100, Jiri Olsa wrote:
> > On Mon, Mar 24, 2014 at 03:36:56PM -0400, Don Zickus wrote:
> >
> > SNIP
> >
> >>  
> >>  static int perf_c2c__process_load_store(struct perf_c2c *c2c,
> >> +					struct addr_location *al,
> >>  					struct perf_sample *sample,
> >> -					struct addr_location *al)
> >> +					struct perf_evsel *evsel)
> >>  {
> >> -	if (c2c->raw_records)
> >> -		perf_sample__fprintf(sample, ' ', "raw input", al, stdout);
> >> +	struct mem_info *mi;
> >> +
> >> +	mi = sample__resolve_mem(sample, al);
> >> +	if (!mi)
> >> +		return -ENOMEM;
> >
> > perhaps not directly related to this patchset, but I needed
> > attached patch to get resolved data in .bss (static), which
> > for some reason happened to be located in executable segment
> 
> Wasn't it a read-only/const data?

I believe it had the 'x' bit set.  Or the kernel was not passing any
protection bits, so it defaulted to MAP_FUNCTION?

Cheers,
Don

> 
> Hmm.. maybe we could copy the text map and add it to a variable map
> group if it has any variables in it..
> 
> Thanks,
> Namhyung
> 
> >
> > I wonder why we need this VARIABLE/FUNCTION separation at all,
> > I think Arnaldo told me some archs could have same addresses
> > for data and functions.. will check ;-)
> >
> > jirka
> >
> > ---
> > diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> > index d9d86c6..be6d7cf 100644
> > --- a/tools/perf/util/machine.c
> > +++ b/tools/perf/util/machine.c
> > @@ -1220,6 +1220,10 @@ static void ip__resolve_data(struct machine *machine, struct thread *thread,
> >  
> >  	thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr,
> >  				   &al);
> > +	if (!al.map)
> > +		thread__find_addr_location(thread, machine, m, MAP__FUNCTION, addr,
> > +					   &al);
> > +
> >  	ams->addr = addr;
> >  	ams->al_addr = al.addr;
> >  	ams->sym = al.sym;
--
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