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-rw-r--r--src/plugins/perfmon/arm/bundle/branch_pred.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/src/plugins/perfmon/arm/bundle/branch_pred.c b/src/plugins/perfmon/arm/bundle/branch_pred.c
new file mode 100644
index 00000000000..7ab656f2758
--- /dev/null
+++ b/src/plugins/perfmon/arm/bundle/branch_pred.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 2022 Arm 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 <vppinfra/linux/sysfs.h>
+#include <perfmon/perfmon.h>
+#include <perfmon/arm/events.h>
+
+/* as per .events[n] in PERFMON_REGISTER_BUNDLE */
+enum
+{
+ BR_RETIRED,
+ BR_MIS_PRED_RETIRED,
+ BR_PRED,
+ BR_MIS_PRED
+};
+
+static u8 *
+format_arm_branch_pred (u8 *s, va_list *args)
+{
+ perfmon_node_stats_t *ns = va_arg (*args, perfmon_node_stats_t *);
+ int row = va_arg (*args, int);
+
+ switch (row)
+ {
+ case 0:
+ s = format (s, "%.2f", (f64) ns->value[BR_RETIRED] / ns->n_calls);
+ break;
+
+ case 1:
+ s = format (s, "%.2f", (f64) ns->value[BR_RETIRED] / ns->n_packets);
+ break;
+
+ case 2:
+ s =
+ format (s, "%.2f", (f64) ns->value[BR_MIS_PRED_RETIRED] / ns->n_calls);
+ break;
+
+ case 3:
+ s = format (s, "%.2f",
+ (f64) ns->value[BR_MIS_PRED_RETIRED] / ns->n_packets);
+ break;
+
+ case 4:
+ s =
+ format (s, "%.2f%%",
+ (ns->value[BR_RETIRED] ? (f64) ns->value[BR_MIS_PRED_RETIRED] /
+ ns->value[BR_RETIRED] * 100 :
+ 0));
+ break;
+
+ case 5:
+ s = format (s, "%.2f", (f64) ns->value[BR_PRED] / ns->n_calls);
+ break;
+
+ case 6:
+ s = format (s, "%.2f", (f64) ns->value[BR_PRED] / ns->n_packets);
+ break;
+
+ case 7:
+ s = format (s, "%.2f", (f64) ns->value[BR_MIS_PRED] / ns->n_calls);
+ break;
+
+ case 8:
+ s = format (s, "%.2f", (f64) ns->value[BR_MIS_PRED] / ns->n_packets);
+ break;
+
+ case 9:
+ s = format (s, "%.2f%%",
+ (ns->value[BR_PRED] ?
+ (f64) ns->value[BR_MIS_PRED] / ns->value[BR_PRED] * 100 :
+ 0));
+ break;
+
+ case 10:
+ s = format (s, "%llu", ns->n_packets);
+ break;
+ }
+ return s;
+}
+
+PERFMON_REGISTER_BUNDLE (arm_branch_pred) = {
+ .name = "branch-pred",
+ .description = "Branch (mis)predictions per call/packet",
+ .source = "arm",
+ .type = PERFMON_BUNDLE_TYPE_NODE,
+ .events[0] = ARMV8_PMUV3_BR_RETIRED,
+ .events[1] = ARMV8_PMUV3_BR_MIS_PRED_RETIRED,
+ .events[2] = ARMV8_PMUV3_BR_PRED,
+ .events[3] = ARMV8_PMUV3_BR_MIS_PRED,
+ .n_events = 4,
+ .n_columns = 11,
+ .format_fn = format_arm_branch_pred,
+ .column_headers = PERFMON_STRINGS ("[1.1]", "[1.2]", "[1.3]", "[1.4]", "\%",
+ "[2.1]", "[2.2]", "[2.3]", "[2.4]", "\%",
+ "pkts"),
+ /*
+ * set a bit for every event used in each column
+ * this allows us to disable columns at bundle registration if an
+ * event is not supported
+ */
+ .column_events = PERFMON_COLUMN_EVENTS (
+ SET_BIT (BR_RETIRED), SET_BIT (BR_RETIRED), SET_BIT (BR_MIS_PRED_RETIRED),
+ SET_BIT (BR_MIS_PRED_RETIRED),
+ SET_BIT (BR_RETIRED) | SET_BIT (BR_MIS_PRED_RETIRED), SET_BIT (BR_PRED),
+ SET_BIT (BR_PRED), SET_BIT (BR_MIS_PRED), SET_BIT (BR_MIS_PRED),
+ SET_BIT (BR_PRED) | SET_BIT (BR_MIS_PRED), 0),
+ .footer =
+ "An instruction that has been executed and retired is defined to\n"
+ "be architecturally executed. When a PE can perform speculative\n"
+ "execution, an instruction is not architecturally executed if the\n"
+ "PE discards the results of the speculative execution.\n\n"
+ "Per node statistics:\n"
+ "[1] Branch instruction architecturally executed\n"
+ " [1.1] Branches/call\n"
+ " [1.2] Branches/pkt\n"
+ " [1.3] Mispredicted/call \n"
+ " [1.4] Mispredicted/pkt\n"
+ " [\%] Percentage of branches mispredicted\n"
+ "[2] Predictable branch speculatively executed\n"
+ " [2.1] Branches/call\n"
+ " [2.2] Branches/pkt\n"
+ " [2.3] Mispredicted/call \n"
+ " [2.4] Mispredicted/pkt\n"
+ " [\%] Percentage of branches mispredicted\n\n"
+ "- See Armv8-A Architecture Reference Manual, D7.10 PMU events and"
+ " event numbers for full description.\n"
+};