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tools lib traceevent: Add offset option for function plugin

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When the offset option is set for the function plugin enabled, it will
display the offset of the functions along with their names.  This helps
in finding exactly where a function was called by its parent.

  trace-cmd report -O parent -O offset
 [..]
        rcuc/163-1330  [163]   740.653251: function: _raw_spin_lock+0x0  <-- rcu_cpu_kthread+0x4d8

Link: http://lore.kernel.org/linux-trace-devel/20200702174950.123454-2-tz.stoyanov@gmail.com

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
[ Ported from trace-cmd.git ]
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/lkml/20200702185704.986181512@goodmis.org
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Steven Rostedt (VMware) 2020-07-02 14:53:54 -04:00 committed by Arnaldo Carvalho de Melo
parent 97b6c5394d
commit 5786362332
1 changed files with 22 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
tools/lib/traceevent/plugins/plugin_function.c
View file

@ -49,6 +49,13 @@ struct tep_plugin_option plugin_options[] =
"Try to show function call indents, based on parents",
.set = 1,
},
{
.name = "offset",
.plugin_alias = "ftrace",
.description =
"Show function names as well as their offsets",
.set = 0,
},
{
.name = NULL,
}
@ -56,6 +63,7 @@ struct tep_plugin_option plugin_options[] =
static struct tep_plugin_option *ftrace_parent = &plugin_options[0];
static struct tep_plugin_option *ftrace_indent = &plugin_options[1];
static struct tep_plugin_option *ftrace_offset = &plugin_options[2];
static void add_child(struct func_stack *stack, const char *child, int pos)
{
@ -123,6 +131,18 @@ static int add_and_get_index(const char *parent, const char *child, int cpu)
return 0;
}
static void show_function(struct trace_seq *s, struct tep_handle *tep,
const char *func, unsigned long long function)
{
unsigned long long offset;
trace_seq_printf(s, "%s", func);
if (ftrace_offset->set) {
offset = tep_find_function_address(tep, function);
trace_seq_printf(s, "+0x%x ", (int)(function - offset));
}
}
static int function_handler(struct trace_seq *s, struct tep_record *record,
struct tep_event *event, void *context)
{
@ -149,14 +169,14 @@ static int function_handler(struct trace_seq *s, struct tep_record *record,
trace_seq_printf(s, "%*s", index*3, "");
if (func)
trace_seq_printf(s, "%s", func);
show_function(s, tep, func, function);
else
trace_seq_printf(s, "0x%llx", function);
if (ftrace_parent->set) {
trace_seq_printf(s, " <-- ");
if (parent)
trace_seq_printf(s, "%s", parent);
show_function(s, tep, parent, pfunction);
else
trace_seq_printf(s, "0x%llx", pfunction);
}