perfmon: new perfmon plugin

Type: feature
Change-Id: I2c14f82393d11fc05c6d229f5c58603ab5c0f14d
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 120 insertions, 0 deletions

diff --git a/src/plugins/perfmon/linux.c b/src/plugins/perfmon/linux.c
new file mode 100644
index 00000000000..3715267266a
--- /dev/null
+++ b/src/plugins/perfmon/linux.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2020 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/vnet.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vpp/app/version.h>
+#include <linux/limits.h>
+#include <sys/ioctl.h>
+
+#include <perfmon/perfmon.h>
+
+#include <linux/perf_event.h>
+
+#define foreach_perf_sw_counter                                               \
+  _ (CONTEXT_SWITCHES, "context-switches")                                    \
+  _ (PAGE_FAULTS_MIN, "page-faults-minor")                                    \
+  _ (PAGE_FAULTS_MAJ, "page-faults-major")
+
+typedef enum
+{
+#define _(n, s) n,
+  foreach_perf_sw_counter
+#undef _
+} linux_sw_events;
+
+static perfmon_event_t events[] = {
+#define _(n, s)                                                               \
+  [n] = { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##n, .name = s },
+  foreach_perf_sw_counter
+#undef _
+};
+
+PERFMON_REGISTER_SOURCE (linux) = {
+  .name = "linux",
+  .description = "Linux kernel performance counters",
+  .events = events,
+  .n_events = ARRAY_LEN (events),
+};
+
+static u8 *
+format_context_switches (u8 *s, va_list *args)
+{
+  perfmon_reading_t *r = va_arg (*args, perfmon_reading_t *);
+  int row = va_arg (*args, int);
+  f64 t = (f64) r->time_running * 1e-9;
+
+  switch (row)
+    {
+    case 0:
+      s = format (s, "%9.2f", t);
+      break;
+    case 1:
+      if (r->time_running)
+	s = format (s, "%9.2f", (f64) r->value[0] / t);
+      break;
+    }
+  return s;
+}
+
+PERFMON_REGISTER_BUNDLE (context_switches) = {
+  .name = "context-switches",
+  .description = "per-thread context switches",
+  .source = "linux",
+  .type = PERFMON_BUNDLE_TYPE_THREAD,
+  .events[0] = CONTEXT_SWITCHES,
+  .n_events = 1,
+  .format_fn = format_context_switches,
+  .column_headers = PERFMON_STRINGS ("RunTime", "ContextSwitches/Sec"),
+};
+
+static u8 *
+format_page_faults (u8 *s, va_list *args)
+{
+  perfmon_reading_t *r = va_arg (*args, perfmon_reading_t *);
+  int row = va_arg (*args, int);
+  f64 t = (f64) r->time_running * 1e-9;
+
+  switch (row)
+    {
+    case 0:
+      s = format (s, "%9.2f", t);
+      break;
+    case 1:
+      if (r->time_running)
+	s = format (s, "%9.2f", (f64) r->value[0] / t);
+      break;
+    case 2:
+      if (r->time_running)
+	s = format (s, "%9.2f", (f64) r->value[1] / t);
+      break;
+    }
+  return s;
+}
+
+PERFMON_REGISTER_BUNDLE (page_faults) = {
+  .name = "page-faults",
+  .description = "per-thread page faults",
+  .source = "linux",
+  .type = PERFMON_BUNDLE_TYPE_THREAD,
+  .events[0] = PAGE_FAULTS_MIN,
+  .events[1] = PAGE_FAULTS_MAJ,
+  .n_events = 2,
+  .format_fn = format_page_faults,
+  .column_headers = PERFMON_STRINGS ("RunTime", "MinorPageFaults/Sec",
+				     "MajorPageFaults/Sec"),
+};