From: "Tzvetomir Stoyanov (VMware)" <tz.stoya...@gmail.com>
The "kernel_stack" event handler does not depend on any trace-cmd context, it can be used aside from the application. The code is moved to libtraceevent "function" plugin. Link: http://lore.kernel.org/linux-trace-devel/20190726124308.18735-2-tz.stoya...@gmail.com Link: http://lore.kernel.org/linux-trace-devel/20200702174950.123454-4-tz.stoya...@gmail.com Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoya...@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rost...@goodmis.org> --- .../lib/traceevent/plugins/plugin_function.c | 41 +++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/tools/lib/traceevent/plugins/plugin_function.c b/tools/lib/traceevent/plugins/plugin_function.c index cafddd6be983..c7d321968f39 100644 --- a/tools/lib/traceevent/plugins/plugin_function.c +++ b/tools/lib/traceevent/plugins/plugin_function.c @@ -184,11 +184,52 @@ static int function_handler(struct trace_seq *s, struct tep_record *record, return 0; } +static int +trace_stack_handler(struct trace_seq *s, struct tep_record *record, + struct tep_event *event, void *context) +{ + struct tep_format_field *field; + unsigned long long addr; + const char *func; + int long_size; + void *data = record->data; + + field = tep_find_any_field(event, "caller"); + if (!field) { + trace_seq_printf(s, "<CANT FIND FIELD %s>", "caller"); + return 0; + } + + trace_seq_puts(s, "<stack trace >\n"); + + long_size = tep_get_long_size(event->tep); + + for (data += field->offset; data < record->data + record->size; + data += long_size) { + addr = tep_read_number(event->tep, data, long_size); + + if ((long_size == 8 && addr == (unsigned long long)-1) || + ((int)addr == -1)) + break; + + func = tep_find_function(event->tep, addr); + if (func) + trace_seq_printf(s, "=> %s (%llx)\n", func, addr); + else + trace_seq_printf(s, "=> %llx\n", addr); + } + + return 0; +} + int TEP_PLUGIN_LOADER(struct tep_handle *tep) { tep_register_event_handler(tep, -1, "ftrace", "function", function_handler, NULL); + tep_register_event_handler(tep, -1, "ftrace", "kernel_stack", + trace_stack_handler, NULL); + tep_plugin_add_options("ftrace", plugin_options); return 0; -- 2.26.2
