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tools lib traceevent: Move kernel_stack event handler to "function" plugin. 

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.stoyanov@gmail.com
Link: http://lore.kernel.org/linux-trace-devel/20200702174950.123454-4-tz.stoyanov@gmail.com

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
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/20200702185705.284789930@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Tzvetomir Stoyanov (VMware) 2020-07-02 14:53:56 -04:00 committed by Arnaldo Carvalho de Melo
parent 5973e6ebc0
commit 0dfceeffae
1 changed files with 41 additions and 0 deletions
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41
tools/lib/traceevent/plugins/plugin_function.c
View File

@ -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;