1 files changed, 127 insertions, 0 deletions
diff --git a/src/common/EventTrace.cc b/src/common/EventTrace.cc
new file mode 100644
index 00000000..04c61e93
--- /dev/null
+++ b/src/common/EventTrace.cc
@@ -0,0 +1,127 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) Intel Corporation.
+ * All rights reserved.
+ *
+ * Author: Anjaneya Chagam <anjaneya.chagam@intel.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include "common/EventTrace.h"
+#include "common/TracepointProvider.h"
+#include "messages/MOSDOpReply.h"
+
+#ifdef WITH_LTTNG
+#define TRACEPOINT_DEFINE
+#define TRACEPOINT_PROBE_DYNAMIC_LINKAGE
+#include "tracing/eventtrace.h"
+#undef TRACEPOINT_PROBE_DYNAMIC_LINKAGE
+#undef TRACEPOINT_DEFINE
+#else
+#define tracepoint(...)
+#endif
+
+TracepointProvider::Traits event_tracepoint_traits("libeventtrace_tp.so", "event_tracing");
+bool EventTrace::tpinit = false;
+
+void EventTrace::init_tp(CephContext *_ctx)
+{
+  if (unlikely(!_ctx))
+    return;
+
+  if (unlikely(!tpinit)) {
+    TracepointProvider::initialize<event_tracepoint_traits>(_ctx);
+    tpinit = true;
+  }
+}
+
+void EventTrace::set_message_attrs(const Message *m, string& oid, string& context, bool incl_oid)
+{
+  // arg1 = oid, arg2 = message type, arg3 = source!source_addr!tid!sequence
+  if (m && (m->get_type() == CEPH_MSG_OSD_OP || m->get_type() == CEPH_MSG_OSD_OPREPLY)) {
+    if (incl_oid) {
+      if (m->get_type() == CEPH_MSG_OSD_OP)
+        oid = ((MOSDOp *)m)->get_oid().name;
+      else
+        oid = ((MOSDOpReply *)m)->get_oid().name;
+    }
+
+    ostringstream buf;
+    buf << m->get_source() << "!" << m->get_source_addr() << "!"
+        << m->get_tid() << "!" << m->get_seq() << "!" << m->get_type();
+    context = buf.str();
+  }
+}
+
+EventTrace::EventTrace(CephContext *_ctx, const char *_file, const char *_func, int _line) :
+  ctx(_ctx),
+  file(_file),
+  func(_func),
+  line(_line)
+{
+  if (unlikely(!ctx)) 
+    return;
+  last_ts = ceph_clock_now();
+  init_tp(ctx);
+
+  lsubdout(ctx, eventtrace, LOG_LEVEL) << "ENTRY (" <<  func << ") " << file << ":" << line << dendl;
+  tracepoint(eventtrace, func_enter, file.c_str(), func.c_str(), line);
+}
+
+EventTrace::~EventTrace()
+{
+  if (unlikely(!ctx)) 
+    return;
+  lsubdout(ctx, eventtrace, LOG_LEVEL) << "EXIT (" << func << ") " << file << dendl;
+  tracepoint(eventtrace, func_exit, file.c_str(), func.c_str());
+}
+
+void EventTrace::log_event_latency(const char *event)
+{
+  utime_t now = ceph_clock_now();
+  double usecs = (now.to_nsec()-last_ts.to_nsec())/1000;
+  OID_ELAPSED("", usecs, event);
+  last_ts = now;
+}
+
+void EventTrace::trace_oid_event(const char *oid, const char *event, const char *context,
+  const char *file, const char *func, int line)
+{
+  if (unlikely(!g_ceph_context))
+    return;
+  init_tp(g_ceph_context);
+  tracepoint(eventtrace, oid_event, oid, event, context, file, func, line);
+}
+
+void EventTrace::trace_oid_event(const Message *m, const char *event, const char *file,
+  const char *func, int line, bool incl_oid)
+{
+  string oid, context;
+  set_message_attrs(m, oid, context, incl_oid);
+  trace_oid_event(oid.c_str(), event, context.c_str(), file, func, line);
+}
+
+void EventTrace::trace_oid_elapsed(const char *oid, const char *event, const char *context,
+  double elapsed, const char *file, const char *func, int line)
+{
+  if (unlikely(!g_ceph_context))
+    return;
+  init_tp(g_ceph_context);
+  tracepoint(eventtrace, oid_elapsed, oid, event, context, elapsed, file, func, line);
+}
+
+void EventTrace::trace_oid_elapsed(const Message *m, const char *event, double elapsed,
+  const char *file, const char *func, int line, bool incl_oid)
+{
+  string oid, context;
+  set_message_attrs(m, oid, context, incl_oid);
+  trace_oid_elapsed(oid.c_str(), event, context.c_str(), elapsed, file, func, line);
+}