2 # -*- coding: utf-8 -*-
5 Ftrace built-in backend.
8 __author__ = "Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>"
9 __copyright__ = "Copyright (C) 2013 Hitachi, Ltd."
10 __license__ = "GPL version 2 or (at your option) any later version"
12 __maintainer__ = "Stefan Hajnoczi"
13 __email__ = "stefanha@redhat.com"
16 from tracetool import out
22 def generate_h_begin(events):
23 out('#include "trace/ftrace.h"',
24 '#include "trace/control.h"',
28 def generate_h(event):
29 argnames = ", ".join(event.args.names())
30 if len(event.args) > 0:
31 argnames = ", " + argnames
34 ' char ftrace_buf[MAX_TRACE_STRLEN];',
35 ' int unused __attribute__ ((unused));',
37 ' if (trace_event_get_state(%(event_id)s)) {',
38 ' trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,',
39 ' "%(name)s " %(fmt)s "\\n" %(argnames)s);',
40 ' trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);',
41 ' unused = write(trace_marker_fd, ftrace_buf, trlen);',
46 event_id="TRACE_" + event.name.upper(),
47 fmt=event.fmt.rstrip("\n"),