perf tools: Set the maximum allowed stack from /proc/sys/kernel/perf_event_max_stack

[cascardo/linux.git] / tools / perf / builtin-script.c

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index f43b0c6..efca816 100644 (file)
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -2031,7 +2031,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
        OPT_UINTEGER(0, "max-stack", &scripting_max_stack,
                     "Set the maximum stack depth when parsing the callchain, "
                     "anything beyond the specified depth will be ignored. "
-                    "Default: " __stringify(PERF_MAX_STACK_DEPTH)),
+                    "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
        OPT_BOOLEAN('I', "show-info", &show_full_info,
                    "display extended information from perf.data file"),
        OPT_BOOLEAN('\0', "show-kernel-path", &symbol_conf.show_kernel_path,
@@ -2067,6 +2067,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
                NULL
        };
 
+       scripting_max_stack = sysctl_perf_event_max_stack;
+
        setup_scripting();
 
        argc = parse_options_subcommand(argc, argv, options, script_subcommands, script_usage,