linux-kernel - Re: [PATCH 6/9] perf tools: Don't search for active kernel start in __machine__create_kernel

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Date:   Mon, 19 Feb 2018 09:21:08 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>, kernel-team@....com
Subject: Re: [PATCH 6/9] perf tools: Don't search for active kernel start in
 __machine__create_kernel_maps

Em Mon, Feb 19, 2018 at 11:20:36AM +0900, Namhyung Kim escreveu:
> On Thu, Feb 15, 2018 at 01:26:32PM +0100, Jiri Olsa wrote:
> >  	if (!machine__get_running_kernel_start(machine, &name, &addr)) {
> >  		if (name &&
> >  		    maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name, addr)) {
> >  			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);
> 
> With above change, I think it work.  But the whole point of the above
> is to set the end address of vmlinux and modules.  And now we don't
> need it for modules thanks to modules__parse() for passing the size.
> 
> So we only needs to update the end address of vmlinux using the start
> address of the first module.  What about this then?

Looks ok, Jiri? I noticed that Namhyung has the patch below in his git
tree, but I couldn't find it in the mailing list, Jiri, can I have your
acked-by?

- Arnaldo
 
> Thanks,
> Namhyung
> 
> 
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index fe27ef55cbb9..022f0539b750 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -1021,13 +1021,6 @@ 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];
> @@ -1235,6 +1228,7 @@ 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;
>         int ret;
>  
> @@ -1261,13 +1255,13 @@ 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)
> +               machine__set_kernel_mmap(machine, addr, map->start);
> +
>         return 0;
>  }