linux-kernel - Re: [PATCH] perf tools: set kernel end address properly

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Date:   Mon, 16 Apr 2018 10:51:25 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@....com,
        Kim Phillips <kim.phillips@....com>
Subject: Re: [PATCH] perf tools: set kernel end address properly

Em Mon, Apr 16, 2018 at 11:23:45AM +0200, Jiri Olsa escreveu:
> On Mon, Apr 16, 2018 at 01:22:40PM +0900, Namhyung Kim wrote:
> > The map_groups__fixup_end() was called to set end addresses of kernel
> > map and module maps.  But now machine__create_modules() is set the end
> > address of modules properly so the only remaining piece is the kernel
> > map.  We can set it with adjacent module's address directly instead of
> > calling the map_groups__fixup_end().  If there's no module after the
> > kernel map, the end address will be ~0ULL.

I wonder if it wouldn't be better to have it as last symbol + PAGE_SIZE
or something like that...

But, anyway, Kim, does this fix things for you? Can I have your
Tested-by?

> > Reported-by: Kim Phillips <kim.phillips@....com>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> 
> looks good
> 
> Acked-by: Jiri Olsa <jolsa@...nel.org>
> 
> thanks,
> jirka
> 
> > ---
> >  tools/perf/util/machine.c | 20 ++++++++------------
> >  1 file changed, 8 insertions(+), 12 deletions(-)
> > 
> > diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> > index 2eca8478e24f..be328416de61 100644
> > --- a/tools/perf/util/machine.c
> > +++ b/tools/perf/util/machine.c
> > @@ -1019,13 +1019,6 @@ int machine__load_vmlinux_path(struct machine *machine, enum map_type type)
> >  	return ret;
> >  }
> >  
> > -static void map_groups__fixup_end(struct map_groups *mg)
> > -{
> > -	int i;
> > -	for (i = 0; i < MAP__NR_TYPES; ++i)
> > -		__map_groups__fixup_end(mg, i);
> > -}
> > -
> >  static char *get_kernel_version(const char *root_dir)
> >  {
> >  	char version[PATH_MAX];
> > @@ -1233,7 +1226,9 @@ int machine__create_kernel_maps(struct machine *machine)
> >  {
> >  	struct dso *kernel = machine__get_kernel(machine);
> >  	const char *name = NULL;
> > +	struct map *map;
> >  	u64 addr = 0;
> > +	u64 end = ~0ULL;
> >  	int ret;
> >  
> >  	if (kernel == NULL)
> > @@ -1259,13 +1254,14 @@ int machine__create_kernel_maps(struct machine *machine)
> >  			machine__destroy_kernel_maps(machine);
> >  			return -1;
> >  		}
> > -		machine__set_kernel_mmap(machine, addr, 0);
> >  	}
> >  
> > -	/*
> > -	 * Now that we have all the maps created, just set the ->end of them:
> > -	 */
> > -	map_groups__fixup_end(&machine->kmaps);
> > +	/* update end address of the kernel map using adjacent module address */
> > +	map = map__next(machine__kernel_map(machine));
> > +	if (map)
> > +		end = map->start;
> > +
> > +	machine__set_kernel_mmap(machine, addr, end);
> >  	return 0;
> >  }
> >  
> > -- 
> > 2.16.2
> >