[PATCH -tip v3 5/5] perf script: add option resolving vmlinux path

[Akihiro Nagai <akihiro.nagai.hw@hitachi.com>]

Add the option get the path of [kernel.kallsyms].
Specify '--show-kernel-path' option to use this function.
This patch enables other applications to use this output easily.

Without --show-kernel-path  option

# perf script -f ip,dso
ffffffff81467612 irq_return ([kernel.kallsyms])
ffffffff81467612 irq_return ([kernel.kallsyms])
    7f24fc02a6b3 _start (/lib64/ld-2.14.so)
[snip]

With --show-kernel-path option

# perf script -f ip,dso --show-kernel-path
ffffffff81467612 irq_return (/lib/modules/3.0.0+/build/vmlinux)
ffffffff81467612 irq_return (/lib/modules/3.0.0+/build/vmlinux)
    7f24fc02a6b3 _start (/lib64/ld-2.14.so)
[snip]

Signed-off-by: Akihiro Nagai <akihiro.nagai.hw@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---

 tools/perf/Documentation/perf-script.txt |    3 +++
 tools/perf/builtin-script.c              |    2 ++
 tools/perf/util/map.c                    |    9 ++++++---
 tools/perf/util/symbol.h                 |    1 +
 4 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index ee4d477..5383671 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -188,6 +188,9 @@ OPTIONS
 	CPUs are specified with -: 0-2. Default is to report samples on all
 	CPUs.
 
+--show-kernel-path::
+	Try to resolve the path of [kernel.kallsyms]
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-script-perl[1],
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 78797b3..ba5d3bb 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1095,6 +1095,8 @@ static const struct option options[] = {
 		     "addr,offs",
 		     parse_output_fields),
 	OPT_STRING('c', "cpu", &cpu_list, "cpu", "list of cpus to profile"),
+	OPT_BOOLEAN('\0', "show-kernel-path", &symbol_conf.show_kernel_path,
+		    "Show the path of [kernel.kallsyms]"),
 
 	OPT_END()
 };
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 530a5ea..6ba4909 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -204,9 +204,12 @@ void map__print_dsoname(struct map *self)
 {
 	const char *dsoname;
 
-	if (self && self->dso && self->dso->name)
-		dsoname = self->dso->name;
-	else
+	if (self && self->dso && (self->dso->name || self->dso->long_name)) {
+		if (symbol_conf.show_kernel_path && self->dso->long_name)
+			dsoname = self->dso->long_name;
+		else if (self->dso->name)
+			dsoname = self->dso->name;
+	} else
 		dsoname = "[unknown]";
 
 	printf("%s", dsoname);
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 554b2fe..3a63c92 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -69,6 +69,7 @@ struct strlist;
 struct symbol_conf {
 	unsigned short	priv_size;
 	bool		try_vmlinux_path,
+			show_kernel_path,
 			use_modules,
 			sort_by_name,
 			show_nr_samples,