perf config: Add annotate.demangle{,_kernel}

Committer notes:

This allows setting this in from the command line:

  $ perf config annotate.demangle
  $ perf config annotate.demangle=yes
  $ perf config annotate.demangle
  annotate.demangle=yes
  $ cat ~/.perfconfig
  # this file is auto-generated.
  [report]
  	sort-order = srcline
  [annotate]
  	demangle = yes
  $
  $
  $ perf config annotate.demangle_kernel
  $ perf config annotate.demangle_kernel=yes
  $ perf config annotate.demangle_kernel
  annotate.demangle_kernel=yes
  $ cat ~/.perfconfig
  # this file is auto-generated.
  [report]
  	sort-order = srcline
  [annotate]
  	demangle = yes
  	demangle_kernel = yes
  $
Signed-off-by: NMartin Liška <mliska@suse.cz>
Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Link: https://lore.kernel.org/r/c96aabe7-791f-9503-295f-3147a9d19b60@suse.czSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-config.txt

@@ -393,6 +393,12 @@ annotate.*::
 
 		This option works with tui, stdio2 browsers.
 
+	annotate.demangle::
+		Demangle symbol names to human readable form. Default is 'true'.
+
+	annotate.demangle_kernel::
+		Demangle kernel symbol names to human readable form. Default is 'true'.
+
 hist.*::
 	hist.percentage::
 		This option control the way to calculate overhead of filtered entries -

tools/perf/util/annotate.c

@@ -3144,6 +3144,10 @@ static int annotation__config(const char *var, const char *value, void *data)
 		opt->use_offset = perf_config_bool("use_offset", value);
 	} else if (!strcmp(var, "annotate.disassembler_style")) {
 		opt->disassembler_style = value;
+	} else if (!strcmp(var, "annotate.demangle")) {
+		symbol_conf.demangle = perf_config_bool("demangle", value);
+	} else if (!strcmp(var, "annotate.demangle_kernel")) {
+		symbol_conf.demangle_kernel = perf_config_bool("demangle_kernel", value);
 	} else {
 		pr_debug("%s variable unknown, ignoring...", var);
 	}