linux-kernel - [PATCH] perf annotate: add --demangle and --demangle-kernel

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Date:   Tue, 30 Mar 2021 20:33:55 +0200
From:   Martin Liška <mliska@...e.cz>
To:     linux-perf-users@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: [PATCH] perf annotate: add --demangle and --demangle-kernel

Perf annotate supports --symbol but it's impossible to filter
a C++ symbol. With --no-demangle one can filter easily by
mangled function name.

Signed-off-by: Martin Liška <mliska@...e.cz>
---
  tools/perf/Documentation/perf-annotate.txt | 7 +++++++
  tools/perf/builtin-annotate.c              | 4 ++++
  2 files changed, 11 insertions(+)

diff --git a/tools/perf/Documentation/perf-annotate.txt b/tools/perf/Documentation/perf-annotate.txt
index 1b5042f134a8..80c1be5d566c 100644
--- a/tools/perf/Documentation/perf-annotate.txt
+++ b/tools/perf/Documentation/perf-annotate.txt
@@ -124,6 +124,13 @@ OPTIONS
  --group::
  	Show event group information together
  
+--demangle::
+	Demangle symbol names to human readable form. It's enabled by default,
+	disable with --no-demangle.
+
+--demangle-kernel::
+	Demangle kernel symbol names to human readable form (for C++ kernels).
+
  --percent-type::
  	Set annotation percent type from following choices:
  	  global-period, local-period, global-hits, local-hits
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 0f3a196e5d6e..021d974c978e 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -538,6 +538,10 @@ int cmd_annotate(int argc, const char **argv)
  		    "Strip first N entries of source file path name in programs (with --prefix)"),
  	OPT_STRING(0, "objdump", &annotate.opts.objdump_path, "path",
  		   "objdump binary to use for disassembly and annotations"),
+	OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
+		    "Enable symbol demangling"),
+	OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
+		    "Enable kernel symbol demangling"),
  	OPT_BOOLEAN(0, "group", &symbol_conf.event_group,
  		    "Show event group information together"),
  	OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
-- 
2.30.2