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

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Message-ID: <20180416092345.GA23274@krava>
Date:   Mon, 16 Apr 2018 11:23:45 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...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

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.
> 
> 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
>