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+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "syshead.h"
+
+#include "perf.h"
+
+#ifdef ENABLE_PERFORMANCE_METRICS
+
+#include "error.h"
+#include "otime.h"
+
+#include "memdbg.h"
+
+static const char *metric_names[] = {
+ "PERF_BIO_READ_PLAINTEXT",
+ "PERF_BIO_WRITE_PLAINTEXT",
+ "PERF_BIO_READ_CIPHERTEXT",
+ "PERF_BIO_WRITE_CIPHERTEXT",
+ "PERF_TLS_MULTI_PROCESS",
+ "PERF_IO_WAIT",
+ "PERF_EVENT_LOOP",
+ "PERF_MULTI_CREATE_INSTANCE",
+ "PERF_MULTI_CLOSE_INSTANCE",
+ "PERF_MULTI_SHOW_STATS",
+ "PERF_MULTI_BCAST",
+ "PERF_MULTI_MCAST",
+ "PERF_SCRIPT",
+ "PERF_READ_IN_LINK",
+ "PERF_PROC_IN_LINK",
+ "PERF_READ_IN_TUN",
+ "PERF_PROC_IN_TUN",
+ "PERF_PROC_OUT_LINK",
+ "PERF_PROC_OUT_TUN",
+ "PERF_PROC_OUT_TUN_MTCP"
+};
+
+struct perf
+{
+# define PS_INITIAL 0
+# define PS_METER_RUNNING 1
+# define PS_METER_INTERRUPTED 2
+ int state;
+
+ struct timeval start;
+ double sofar;
+ double sum;
+ double max;
+ double count;
+};
+
+struct perf_set
+{
+ int stack_len;
+ int stack[STACK_N];
+ struct perf perf[PERF_N];
+};
+
+static struct perf_set perf_set;
+
+static void perf_print_state (int lev);
+
+static inline int
+get_stack_index (int sdelta)
+{
+ const int sindex = perf_set.stack_len + sdelta;
+ if (sindex >= 0 && sindex < STACK_N)
+ return sindex;
+ else
+ return -1;
+}
+
+static int
+get_perf_index (int sdelta)
+{
+ const int sindex = get_stack_index (sdelta);
+ if (sindex >= 0)
+ {
+ const int pindex = perf_set.stack[sindex];
+ if (pindex >= 0 && pindex < PERF_N)
+ return pindex;
+ else
+ return -1;
+ }
+ else
+ return -1;
+}
+
+static struct perf *
+get_perf (int sdelta)
+{
+ const int pindex = get_perf_index (sdelta);
+ if (pindex >= 0)
+ return &perf_set.perf[pindex];
+ else
+ return NULL;
+}
+
+static void
+push_perf_index (int pindex)
+{
+ const int sindex = get_stack_index (0);
+ const int newlen = get_stack_index (1);
+ if (sindex >= 0 && newlen >= 0
+ && pindex >= 0 && pindex < PERF_N)
+ {
+ int i;
+ for (i = 0; i < sindex; ++i)
+ if (perf_set.stack[i] == pindex)
+ {
+ perf_print_state (M_INFO);
+ msg (M_FATAL, "PERF: push_perf_index %s failed",
+ metric_names [pindex]);
+ }
+
+ perf_set.stack[sindex] = pindex;
+ perf_set.stack_len = newlen;
+ }
+ else
+ msg (M_FATAL, "PERF: push_perf_index: stack push error");
+}
+
+static void
+pop_perf_index (void)
+{
+ const int newlen = get_stack_index (-1);
+ if (newlen >= 0)
+ {
+ perf_set.stack_len = newlen;
+ }
+ else
+ msg (M_FATAL, "PERF: pop_perf_index: stack pop error");
+}
+
+static void
+state_must_be (const struct perf *p, const int wanted)
+{
+ if (p->state != wanted)
+ msg (M_FATAL, "PERF: bad state actual=%d wanted=%d",
+ p->state,
+ wanted);
+}
+
+static void
+update_sofar (struct perf *p)
+{
+ struct timeval current;
+ ASSERT (!gettimeofday (&current, NULL));
+ p->sofar += (double) tv_subtract (&current, &p->start, 600) / 1000000.0;
+ tv_clear (&p->start);
+}
+
+static void
+perf_start (struct perf *p)
+{
+ state_must_be (p, PS_INITIAL);
+ ASSERT (!gettimeofday (&p->start, NULL));
+ p->sofar = 0.0;
+ p->state = PS_METER_RUNNING;
+}
+
+static void
+perf_stop (struct perf *p)
+{
+ state_must_be (p, PS_METER_RUNNING);
+ update_sofar (p);
+ p->sum += p->sofar;
+ if (p->sofar > p->max)
+ p->max = p->sofar;
+ p->count += 1.0;
+ p->sofar = 0.0;
+ p->state = PS_INITIAL;
+}
+
+static void
+perf_interrupt (struct perf *p)
+{
+ state_must_be (p, PS_METER_RUNNING);
+ update_sofar (p);
+ p->state = PS_METER_INTERRUPTED;
+}
+
+static void
+perf_resume (struct perf *p)
+{
+ state_must_be (p, PS_METER_INTERRUPTED);
+ ASSERT (!gettimeofday (&p->start, NULL));
+ p->state = PS_METER_RUNNING;
+}
+
+void
+perf_push (int type)
+{
+ struct perf *prev;
+ struct perf *cur;
+
+ ASSERT (SIZE(metric_names) == PERF_N);
+ push_perf_index (type);
+
+ prev = get_perf (-2);
+ cur = get_perf (-1);
+
+ ASSERT (cur);
+
+ if (prev)
+ perf_interrupt (prev);
+ perf_start (cur);
+}
+
+void
+perf_pop (void)
+{
+ struct perf *prev;
+ struct perf *cur;
+
+ prev = get_perf (-2);
+ cur = get_perf (-1);
+
+ ASSERT (cur);
+ perf_stop (cur);
+
+ if (prev)
+ perf_resume (prev);
+
+ pop_perf_index ();
+}
+
+void
+perf_output_results (void)
+{
+ int i;
+ msg (M_INFO, "LATENCY PROFILE (mean and max are in milliseconds)");
+ for (i = 0; i < PERF_N; ++i)
+ {
+ struct perf *p = &perf_set.perf[i];
+ if (p->count > 0.0)
+ {
+ const double mean = p->sum / p->count;
+ msg (M_INFO, "%s n=%.0f mean=%.3f max=%.3f", metric_names[i], p->count, mean*1000.0, p->max*1000.0);
+ }
+ }
+}
+
+static void
+perf_print_state (int lev)
+{
+ struct gc_arena gc = gc_new ();
+ int i;
+ msg (lev, "PERF STATE");
+ msg (lev, "Stack:");
+ for (i = 0; i < perf_set.stack_len; ++i)
+ {
+ const int j = perf_set.stack[i];
+ const struct perf *p = &perf_set.perf[j];
+ msg (lev, "[%d] %s state=%d start=%s sofar=%f sum=%f max=%f count=%f",
+ i,
+ metric_names[j],
+ p->state,
+ tv_string (&p->start, &gc),
+ p->sofar,
+ p->sum,
+ p->max,
+ p->count);
+ }
+ gc_free (&gc);
+}
+
+#else
+#ifdef _MSC_VER /* Dummy function needed to avoid empty file compiler warning in Microsoft VC */
+static void dummy(void) {}
+#endif
+#endif
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