perf report: Add --no-demangle option

It's sometimes useful to see undemangled raw symbol name for example
other tools using the perf output to do manipulation of binaries.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Suggested-by: William Cohen <wcohen@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: William Cohen <wcohen@redhat.com>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=55571
Link: http://lkml.kernel.org/r/1364203098-17741-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 02284a0..71f1551 100644 (file)
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -206,6 +206,10 @@ OPTIONS
 --group::
        Show event group information together.
 
+--demangle::
+       Demangle symbol names to human readable form. It's enabled by default,
+       disable with --no-demangle.
+
 SEE ALSO
 --------
 linkperf:perf-stat[1], linkperf:perf-annotate[1]

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 296bd21..b5ea26c 100644 (file)
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -692,6 +692,8 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
                    "use branch records for histogram filling", parse_branch_mode),
        OPT_STRING(0, "objdump", &objdump_path, "path",
                   "objdump binary to use for disassembly and annotations"),
+       OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
+                   "Disable symbol demangling"),
        OPT_END()
        };
 

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 54efcb5..4b12bf8 100644 (file)
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -806,9 +806,12 @@ int dso__load_sym(struct dso *dso, struct map *map,
                 * DWARF DW_compile_unit has this, but we don't always have access
                 * to it...
                 */
-               demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
-               if (demangled != NULL)
-                       elf_name = demangled;
+               if (symbol_conf.demangle) {
+                       demangled = bfd_demangle(NULL, elf_name,
+                                                DMGL_PARAMS | DMGL_ANSI);
+                       if (demangled != NULL)
+                               elf_name = demangled;
+               }
 new_symbol:
                f = symbol__new(sym.st_value, sym.st_size,
                                GELF_ST_BIND(sym.st_info), elf_name);

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index e6432d8..8cf3b54 100644 (file)
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -36,6 +36,7 @@ struct symbol_conf symbol_conf = {
        .use_modules      = true,
        .try_vmlinux_path = true,
        .annotate_src     = true,
+       .demangle         = true,
        .symfs            = "",
 };
 

diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index b62ca37..d7654c2 100644 (file)
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -97,7 +97,8 @@ struct symbol_conf {
                        kptr_restrict,
                        annotate_asm_raw,
                        annotate_src,
-                       event_group;
+                       event_group,
+                       demangle;
        const char      *vmlinux_name,
                        *kallsyms_name,
                        *source_prefix,