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-rw-r--r--src/plugins/perfmon/linux.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/src/plugins/perfmon/linux.c b/src/plugins/perfmon/linux.c
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+/*
+ * 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"),
+};