tools lib traceevent: Add hrtimer plugin

Backporting hrtimer plugin.

Backported from Steven Rostedt's trace-cmd repo (HEAD 0f2c2fb):
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git

This plugin adds function field resolving for following tracepoint
events:

  timer:hrtimer_expire_entry
  timer:hrtimer_start

The diff of 'perf script' output generated by old and new code: (data
was generated by 'perf record -e 'timer:hrtimer*' -a')

  --- script.hrtimer.old
  +++ script.hrtimer.new
  -         swapper     0 [000] 27405.519092: timer:hrtimer_start: [FAILED TO PARSE] hrtimer=0xffff88021e20e800 function=0xffffffff810c0e10 expires=27398383000000 softexpires=27398383000000
  +         swapper     0 [000] 27405.519103: timer:hrtimer_start: hrtimer=0xffff88021e20e800 function=tick_sched_timer expires=27398383000000 softexpires=27398383000000
  -         swapper     0 [001] 27405.519544: timer:hrtimer_expire_entry: [FAILED TO PARSE] hrtimer=0xffff880211334058 now=27398294182491 function=0xffffffff81086f20
  +         swapper     0 [001] 27405.519544: timer:hrtimer_expire_entry: hrtimer=0xffff880211334058 now=27398294182491 function=posix_timer_fn/0x0

Check the 'function' field is translated into the function name.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1386076182-14484-14-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/tools/lib/traceevent/plugin_hrtimer.c b/tools/lib/traceevent/plugin_hrtimer.c
new file mode 100644
index 000000000000..e41d4cf9344f
--- /dev/null
+++ b/tools/lib/traceevent/plugin_hrtimer.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ * Copyright (C) 2009 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License (not later!)
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not,  see <http://www.gnu.org/licenses>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "event-parse.h"
+
+static int timer_expire_handler(struct trace_seq *s,
+                                struct pevent_record *record,
+                                struct event_format *event, void *context)
+{
+        trace_seq_printf(s, "hrtimer=");
+
+        if (pevent_print_num_field(s, "0x%llx", event, "timer",
+                                   record, 0) == -1)
+                pevent_print_num_field(s, "0x%llx", event, "hrtimer",
+                                       record, 1);
+
+        trace_seq_printf(s, " now=");
+
+        pevent_print_num_field(s, "%llu", event, "now", record, 1);
+
+        pevent_print_func_field(s, " function=%s", event, "function",
+                                record, 0);
+        return 0;
+}
+
+static int timer_start_handler(struct trace_seq *s,
+                               struct pevent_record *record,
+                               struct event_format *event, void *context)
+{
+        struct pevent *pevent = event->pevent;
+        struct format_field *fn = pevent_find_field(event, "function");
+        void *data = record->data;
+
+        trace_seq_printf(s, "hrtimer=");
+
+        if (pevent_print_num_field(s, "0x%llx", event, "timer",
+                                   record, 0) == -1)
+                pevent_print_num_field(s, "0x%llx", event, "hrtimer",
+                                       record, 1);
+
+        if (!fn) {
+                trace_seq_printf(s, " function=MISSING");
+        } else {
+                unsigned long long function;
+                const char *func;
+
+                if (pevent_read_number_field(fn, data, &function))
+                        trace_seq_printf(s, " function=INVALID");
+
+                func = pevent_find_function(pevent, function);
+
+                trace_seq_printf(s, " function=%s", func);
+        }
+
+        trace_seq_printf(s, " expires=");
+        pevent_print_num_field(s, "%llu", event, "expires", record, 1);
+
+        trace_seq_printf(s, " softexpires=");
+        pevent_print_num_field(s, "%llu", event, "softexpires", record, 1);
+        return 0;
+}
+
+int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
+{
+        pevent_register_event_handler(pevent, -1,
+                                      "timer", "hrtimer_expire_entry",
+                                      timer_expire_handler, NULL);
+
+        pevent_register_event_handler(pevent, -1, "timer", "hrtimer_start",
+                                      timer_start_handler, NULL);
+        return 0;
+}