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authorRay Kinsella <mdr@ashroe.eu>2021-01-21 18:25:26 +0000
committerDamjan Marion <dmarion@me.com>2021-03-31 15:06:30 +0000
commit7b9b19d7bb6d72bf56ab8f1e0c2f35b15f79b983 (patch)
treed500cb263396f206f163947a7db5a2be5c510d6b /src/plugins
parented7c62a3048f8a976803ba91612e99a49ed0342e (diff)
perfmon: add branch mispredictions
Add branches, branches taken (a meteric for branchy code), and branch misses. Type: improvement Signed-off-by: Ray Kinsella <mdr@ashroe.eu> Change-Id: If92d4aaf9d0a6e3b99b8c19e6311cc08ca470590
Diffstat (limited to 'src/plugins')
-rw-r--r--src/plugins/perfmon/CMakeLists.txt1
-rw-r--r--src/plugins/perfmon/intel/bundle/branch_mispred.c69
-rw-r--r--src/plugins/perfmon/intel/core.h6
3 files changed, 76 insertions, 0 deletions
diff --git a/src/plugins/perfmon/CMakeLists.txt b/src/plugins/perfmon/CMakeLists.txt
index 7e400c59bab..e0d1d30b5a3 100644
--- a/src/plugins/perfmon/CMakeLists.txt
+++ b/src/plugins/perfmon/CMakeLists.txt
@@ -28,4 +28,5 @@ add_vpp_plugin(perfmon
intel/bundle/load_blocks.c
intel/bundle/mem_bw.c
intel/bundle/cache_hit_miss.c
+ intel/bundle/branch_mispred.c
)
diff --git a/src/plugins/perfmon/intel/bundle/branch_mispred.c b/src/plugins/perfmon/intel/bundle/branch_mispred.c
new file mode 100644
index 00000000000..343adc7bc44
--- /dev/null
+++ b/src/plugins/perfmon/intel/bundle/branch_mispred.c
@@ -0,0 +1,69 @@
+/*
+ * 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 <perfmon/perfmon.h>
+#include <perfmon/intel/core.h>
+
+static u8 *
+format_branch_mispredictions (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, "%9.2f", ns->value[0] / (f64) ns->n_calls);
+ break;
+ case 1:
+ s = format (s, "%9.2f", ns->value[0] / (f64) ns->n_packets);
+ break;
+ case 2:
+ s = format (s, "%9.2f", ns->value[1] / (f64) ns->n_calls);
+ break;
+ case 3:
+ s = format (s, "%9.2f", ns->value[1] / (f64) ns->n_packets);
+ break;
+ case 4:
+ s = format (s, "%05.2f", (ns->value[2] / (f64) ns->value[0]) * 100);
+ break;
+ case 5:
+ s = format (s, "%9f", (f64) ns->value[0]);
+ break;
+ case 6:
+ s = format (s, "%9f", (f64) ns->value[1]);
+ break;
+ case 7:
+ s = format (s, "%9f", (f64) ns->value[2]);
+ break;
+ }
+ return s;
+}
+
+PERFMON_REGISTER_BUNDLE (branch_mispredictions) = {
+ .name = "branch-mispred",
+ .description = "Branches, branches taken and mis-predictions",
+ .source = "intel-core",
+ .type = PERFMON_BUNDLE_TYPE_NODE,
+ .events[0] = INTEL_CORE_E_BR_INST_RETIRED_ALL_BRANCHES,
+ .events[1] = INTEL_CORE_E_BR_INST_RETIRED_NEAR_TAKEN,
+ .events[2] = INTEL_CORE_E_BR_MISP_RETIRED_ALL_BRANCHES,
+ .n_events = 3,
+ .format_fn = format_branch_mispredictions,
+ .column_headers = PERFMON_STRINGS ("Branches/call", "Branches/pkt",
+ "Taken/call", "Taken/pkt", "% MisPred"),
+ .raw_column_headers = PERFMON_STRINGS ("branches", "taken", "misses"),
+};
diff --git a/src/plugins/perfmon/intel/core.h b/src/plugins/perfmon/intel/core.h
index d7fd9e03538..01945d2c023 100644
--- a/src/plugins/perfmon/intel/core.h
+++ b/src/plugins/perfmon/intel/core.h
@@ -99,6 +99,12 @@
"Number of instructions retired. General Counter - architectural event") \
_ (0xC2, 0x02, 0, 0, 0, 0x00, UOPS_RETIRED, RETIRE_SLOTS, \
"Retirement slots used.") \
+ _ (0xC4, 0x00, 0, 0, 0, 0x00, BR_INST_RETIRED, ALL_BRANCHES, \
+ "Counts all (macro) branch instructions retired.") \
+ _ (0xC5, 0x00, 0, 0, 0, 0x00, BR_MISP_RETIRED, ALL_BRANCHES, \
+ "All mispredicted macro branch instructions retired.") \
+ _ (0xC4, 0x20, 0, 0, 0, 0x00, BR_INST_RETIRED, NEAR_TAKEN, \
+ "Taken branch instructions retired.") \
_ (0xD0, 0x81, 0, 0, 0, 0x00, MEM_INST_RETIRED, ALL_LOADS, \
"All retired load instructions.") \
_ (0xD0, 0x82, 0, 0, 0, 0x00, MEM_INST_RETIRED, ALL_STORES, \