linux-kernel - Re: [PATCH 1/2] perf probe: Fix use of kernel image path given by 'k' option

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Date:	Mon, 13 Dec 2010 01:01:51 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Franck Bui-Huu <fbuihuu@...il.com>,
	2nddept-manager@....hitachi.co.jp,
	Francis Moreau <francis.moro@...il.com>,
	Franck Bui-Huu <vagabon.xyz@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 1/2] perf probe: Fix use of kernel image path given by
 'k' option

(2010/12/13 0:16), Arnaldo Carvalho de Melo wrote:
> From: Franck Bui-Huu <fbuihuu@...il.com>
> 
> Users were not being able to have the explicitely specified vmlinux
> pathname used, instead a search on the vmlinux path was always being
> made.
> 
> Reported-by: Francis Moreau <francis.moro@...il.com>
> Cc: 2nddept-manager@....hitachi.co.jp
> Cc: Francis Moreau <francis.moro@...il.com>
> Cc: Franck Bui-Huu <vagabon.xyz@...il.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> LPU-Reference: <m3hbelydz8.fsf_-_@...il.com>
> Signed-off-by: Franck Bui-Huu <fbuihuu@...il.com>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

Thanks!

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>


> ---
>  tools/perf/builtin-probe.c    |    5 +++++
>  tools/perf/util/probe-event.c |   15 ++++++++++++---
>  tools/perf/util/symbol.c      |    4 ++--
>  tools/perf/util/symbol.h      |    2 ++
>  4 files changed, 21 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
> index 2e000c0..add163c 100644
> --- a/tools/perf/builtin-probe.c
> +++ b/tools/perf/builtin-probe.c
> @@ -249,6 +249,11 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
>  	     !params.show_lines))
>  		usage_with_options(probe_usage, options);
>  
> +	/*
> +	 * Only consider the user's kernel image path if given.
> +	 */
> +	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
> +
>  	if (params.list_events) {
>  		if (params.mod_events) {
>  			pr_err("  Error: Don't use --list with --add/--del.\n");
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 3b6a529..b71acd6 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -114,6 +114,8 @@ static struct symbol *__find_kernel_function_by_name(const char *name,
>  const char *kernel_get_module_path(const char *module)
>  {
>  	struct dso *dso;
> +	struct map *map;
> +	const char *vmlinux_name;
>  
>  	if (module) {
>  		list_for_each_entry(dso, &machine.kernel_dsos, node) {
> @@ -123,10 +125,17 @@ const char *kernel_get_module_path(const char *module)
>  		}
>  		pr_debug("Failed to find module %s.\n", module);
>  		return NULL;
> +	}
> +
> +	map = machine.vmlinux_maps[MAP__FUNCTION];
> +	dso = map->dso;
> +
> +	vmlinux_name = symbol_conf.vmlinux_name;
> +	if (vmlinux_name) {
> +		if (dso__load_vmlinux(dso, map, vmlinux_name, NULL) <= 0)
> +			return NULL;
>  	} else {
> -		dso = machine.vmlinux_maps[MAP__FUNCTION]->dso;
> -		if (dso__load_vmlinux_path(dso,
> -			 machine.vmlinux_maps[MAP__FUNCTION], NULL) < 0) {
> +		if (dso__load_vmlinux_path(dso, map, NULL) < 0) {
>  			pr_debug("Failed to load kernel map.\n");
>  			return NULL;
>  		}
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index d628c8d..439ab94 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1780,8 +1780,8 @@ out_failure:
>  	return -1;
>  }
>  
> -static int dso__load_vmlinux(struct dso *self, struct map *map,
> -			     const char *vmlinux, symbol_filter_t filter)
> +int dso__load_vmlinux(struct dso *self, struct map *map,
> +		      const char *vmlinux, symbol_filter_t filter)
>  {
>  	int err = -1, fd;
>  
> diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
> index 038f220..6c6eafd 100644
> --- a/tools/perf/util/symbol.h
> +++ b/tools/perf/util/symbol.h
> @@ -166,6 +166,8 @@ void dso__sort_by_name(struct dso *self, enum map_type type);
>  struct dso *__dsos__findnew(struct list_head *head, const char *name);
>  
>  int dso__load(struct dso *self, struct map *map, symbol_filter_t filter);
> +int dso__load_vmlinux(struct dso *self, struct map *map,
> +		      const char *vmlinux, symbol_filter_t filter);
>  int dso__load_vmlinux_path(struct dso *self, struct map *map,
>  			   symbol_filter_t filter);
>  int dso__load_kallsyms(struct dso *self, const char *filename, struct map *map,


-- 
Masami HIRAMATSU
2nd Dept. Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
--
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