[PATCH] perf, tools: Support full source file paths for srcline

[Andi Kleen <andi@firstfloor.org>]

From: Andi Kleen <ak@linux.intel.com>

For perf report/script srcline currently only the base file name
of the source file is printed. This is a good default because
it usually fits on the screen.

But in some cases we want to know the full file name,
for example to aggregate hits per file.

In the later case we need more than the base file name
to resolve file naming collisions: for example the kernel source
has ~70 files named "core.c"

It's also useful as input to post processing tools which
want to point to the right file.

Add a flag to allow full file name output.

Add an option to perf report/script to enable this option.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/Documentation/perf-report.txt | 2 ++
 tools/perf/Documentation/perf-script.txt | 3 +++
 tools/perf/builtin-report.c              | 2 ++
 tools/perf/builtin-script.c              | 2 ++
 tools/perf/util/srcline.c                | 6 +++++-
 tools/perf/util/util.h                   | 1 +
 6 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index c33b69f..aabb1b4 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -353,6 +353,8 @@ OPTIONS
 
 	To disable decoding entirely, use --no-itrace.
 
+--full-source-path::
+	Show the full path for source files for srcline output.
 
 include::callchain-overhead-calculation.txt[]
 
diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index c82df57..7860274 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -256,6 +256,9 @@ OPTIONS
 
 	To disable decoding entirely, use --no-itrace.
 
+--full-source-path::
+	Show the full path for source files for srcline output.
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-script-perl[1],
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 95a4771..c8561cb 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -728,6 +728,8 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_CALLBACK_OPTARG(0, "itrace", &itrace_synth_opts, NULL, "opts",
 			    "Instruction Tracing options",
 			    itrace_parse_synth_opts),
+	OPT_BOOLEAN(0, "full-source-path", &srcline_full_filename,
+			"Show full source file name path for source lines"),
 	OPT_END()
 	};
 	struct perf_data_file file = {
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 24809787..220cbff 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1622,6 +1622,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_CALLBACK_OPTARG(0, "itrace", &itrace_synth_opts, NULL, "opts",
 			    "Instruction Tracing options",
 			    itrace_parse_synth_opts),
+	OPT_BOOLEAN(0, "full-source-path", &srcline_full_filename,
+			"Show full source file name path for source lines"),
 	OPT_END()
 	};
 	const char * const script_subcommands[] = { "record", "report", NULL };
diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
index c93fb0c..fc08248 100644
--- a/tools/perf/util/srcline.c
+++ b/tools/perf/util/srcline.c
@@ -10,6 +10,8 @@
 
 #include "symbol.h"
 
+bool srcline_full_filename;
+
 #ifdef HAVE_LIBBFD_SUPPORT
 
 /*
@@ -277,7 +279,9 @@ char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
 	if (!addr2line(dso_name, addr, &file, &line, dso))
 		goto out;
 
-	if (asprintf(&srcline, "%s:%u", basename(file), line) < 0) {
+	if (asprintf(&srcline, "%s:%u",
+				srcline_full_filename ? file : basename(file),
+				line) < 0) {
 		free(file);
 		goto out;
 	}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 20d625a..282f737 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -318,6 +318,7 @@ static inline int path__join3(char *bf, size_t size,
 struct dso;
 struct symbol;
 
+extern bool srcline_full_filename;
 char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
 		  bool show_sym);
 void free_srcline(char *srcline);
-- 
2.4.3