parse-metric.c

  1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/compiler.h>
  3#include <errno.h>
  4#include <string.h>
  5#include <perf/cpumap.h>
  6#include <perf/evlist.h>
  7#include "metricgroup.h"
  8#include "tests.h"
  9#include "pmu-events/pmu-events.h"
 10#include "evlist.h"
 11#include "rblist.h"
 12#include "debug.h"
 13#include "expr.h"
 14#include "stat.h"
 15#include "pmus.h"
 16
 17struct value {
 18	const char	*event;
 19	u64		 val;
 20};
 21
 22static u64 find_value(const char *name, struct value *values)
 23{
 24	struct value *v = values;
 25
 26	while (v->event) {
 27		if (!strcmp(name, v->event))
 28			return v->val;
 29		v++;
 30	}
 31	return 0;
 32}
 33
 34static void load_runtime_stat(struct evlist *evlist, struct value *vals)
 35{
 36	struct evsel *evsel;
 37	u64 count;
 38
 39	evlist__alloc_aggr_stats(evlist, 1);
 40	evlist__for_each_entry(evlist, evsel) {
 41		count = find_value(evsel->name, vals);
 42		evsel->supported = true;
 43		evsel->stats->aggr->counts.val = count;
 44		evsel->stats->aggr->counts.ena = 1;
 45		evsel->stats->aggr->counts.run = 1;
 46	}
 47}
 48
 49static double compute_single(struct evlist *evlist, const char *name)
 50{
 51	struct metric_expr *mexp;
 52	struct metric_event *me;
 53	struct evsel *evsel;
 54
 55	evlist__for_each_entry(evlist, evsel) {
 56		me = metricgroup__lookup(&evlist->metric_events, evsel, false);
 57		if (me != NULL) {
 58			list_for_each_entry (mexp, &me->head, nd) {
 59				if (strcmp(mexp->metric_name, name))
 60					continue;
 61				return test_generic_metric(mexp, 0);
 62			}
 63		}
 64	}
 65	return 0.;
 66}
 67
 68static int __compute_metric(const char *name, struct value *vals,
 69			    const char *name1, double *ratio1,
 70			    const char *name2, double *ratio2)
 71{
 72	const struct pmu_metrics_table *pme_test;
 73	struct perf_cpu_map *cpus;
 74	struct evlist *evlist;
 75	int err;
 76
 77	/*
 78	 * We need to prepare evlist for stat mode running on CPU 0
 79	 * because that's where all the stats are going to be created.
 80	 */
 81	evlist = evlist__new();
 82	if (!evlist)
 83		return -ENOMEM;
 84
 85	cpus = perf_cpu_map__new("0");
 86	if (!cpus) {
 87		evlist__delete(evlist);
 88		return -ENOMEM;
 89	}
 90
 91	perf_evlist__set_maps(&evlist->core, cpus, NULL);
 92
 93	/* Parse the metric into metric_events list. */
 94	pme_test = find_core_metrics_table("testarch", "testcpu");
 95	err = metricgroup__parse_groups_test(evlist, pme_test, name);
 96	if (err)
 97		goto out;
 98
 99	err = evlist__alloc_stats(/*config=*/NULL, evlist, /*alloc_raw=*/false);
100	if (err)
101		goto out;
102
103	/* Load the runtime stats with given numbers for events. */
104	load_runtime_stat(evlist, vals);
105
106	/* And execute the metric */
107	if (name1 && ratio1)
108		*ratio1 = compute_single(evlist, name1);
109	if (name2 && ratio2)
110		*ratio2 = compute_single(evlist, name2);
111
112out:
113	/* ... cleanup. */
114	evlist__free_stats(evlist);
115	perf_cpu_map__put(cpus);
116	evlist__delete(evlist);
117	return err;
118}
119
120static int compute_metric(const char *name, struct value *vals, double *ratio)
121{
122	return __compute_metric(name, vals, name, ratio, NULL, NULL);
123}
124
125static int compute_metric_group(const char *name, struct value *vals,
126				const char *name1, double *ratio1,
127				const char *name2, double *ratio2)
128{
129	return __compute_metric(name, vals, name1, ratio1, name2, ratio2);
130}
131
132static int test_ipc(void)
133{
134	double ratio;
135	struct value vals[] = {
136		{ .event = "inst_retired.any",        .val = 300 },
137		{ .event = "cpu_clk_unhalted.thread", .val = 200 },
138		{ .event = NULL, },
139	};
140
141	TEST_ASSERT_VAL("failed to compute metric",
142			compute_metric("IPC", vals, &ratio) == 0);
143
144	TEST_ASSERT_VAL("IPC failed, wrong ratio",
145			ratio == 1.5);
146	return 0;
147}
148
149static int test_frontend(void)
150{
151	double ratio;
152	struct value vals[] = {
153		{ .event = "idq_uops_not_delivered.core",        .val = 300 },
154		{ .event = "cpu_clk_unhalted.thread",            .val = 200 },
155		{ .event = "cpu_clk_unhalted.one_thread_active", .val = 400 },
156		{ .event = "cpu_clk_unhalted.ref_xclk",          .val = 600 },
157		{ .event = NULL, },
158	};
159
160	TEST_ASSERT_VAL("failed to compute metric",
161			compute_metric("Frontend_Bound_SMT", vals, &ratio) == 0);
162
163	TEST_ASSERT_VAL("Frontend_Bound_SMT failed, wrong ratio",
164			ratio == 0.45);
165	return 0;
166}
167
168static int test_cache_miss_cycles(void)
169{
170	double ratio;
171	struct value vals[] = {
172		{ .event = "l1d-loads-misses",  .val = 300 },
173		{ .event = "l1i-loads-misses",  .val = 200 },
174		{ .event = "inst_retired.any",  .val = 400 },
175		{ .event = NULL, },
176	};
177
178	TEST_ASSERT_VAL("failed to compute metric",
179			compute_metric("cache_miss_cycles", vals, &ratio) == 0);
180
181	TEST_ASSERT_VAL("cache_miss_cycles failed, wrong ratio",
182			ratio == 1.25);
183	return 0;
184}
185
186
187/*
188 * DCache_L2_All_Hits = l2_rqsts.demand_data_rd_hit + l2_rqsts.pf_hit + l2_rqsts.rfo_hi
189 * DCache_L2_All_Miss = max(l2_rqsts.all_demand_data_rd - l2_rqsts.demand_data_rd_hit, 0) +
190 *                      l2_rqsts.pf_miss + l2_rqsts.rfo_miss
191 * DCache_L2_All      = dcache_l2_all_hits + dcache_l2_all_miss
192 * DCache_L2_Hits     = d_ratio(dcache_l2_all_hits, dcache_l2_all)
193 * DCache_L2_Misses   = d_ratio(dcache_l2_all_miss, dcache_l2_all)
194 *
195 * l2_rqsts.demand_data_rd_hit = 100
196 * l2_rqsts.pf_hit             = 200
197 * l2_rqsts.rfo_hi             = 300
198 * l2_rqsts.all_demand_data_rd = 400
199 * l2_rqsts.pf_miss            = 500
200 * l2_rqsts.rfo_miss           = 600
201 *
202 * DCache_L2_All_Hits = 600
203 * DCache_L2_All_Miss = MAX(400 - 100, 0) + 500 + 600 = 1400
204 * DCache_L2_All      = 600 + 1400  = 2000
205 * DCache_L2_Hits     = 600 / 2000  = 0.3
206 * DCache_L2_Misses   = 1400 / 2000 = 0.7
207 */
208static int test_dcache_l2(void)
209{
210	double ratio;
211	struct value vals[] = {
212		{ .event = "l2_rqsts.demand_data_rd_hit", .val = 100 },
213		{ .event = "l2_rqsts.pf_hit",             .val = 200 },
214		{ .event = "l2_rqsts.rfo_hit",            .val = 300 },
215		{ .event = "l2_rqsts.all_demand_data_rd", .val = 400 },
216		{ .event = "l2_rqsts.pf_miss",            .val = 500 },
217		{ .event = "l2_rqsts.rfo_miss",           .val = 600 },
218		{ .event = NULL, },
219	};
220
221	TEST_ASSERT_VAL("failed to compute metric",
222			compute_metric("DCache_L2_Hits", vals, &ratio) == 0);
223
224	TEST_ASSERT_VAL("DCache_L2_Hits failed, wrong ratio",
225			ratio == 0.3);
226
227	TEST_ASSERT_VAL("failed to compute metric",
228			compute_metric("DCache_L2_Misses", vals, &ratio) == 0);
229
230	TEST_ASSERT_VAL("DCache_L2_Misses failed, wrong ratio",
231			ratio == 0.7);
232	return 0;
233}
234
235static int test_recursion_fail(void)
236{
237	double ratio;
238	struct value vals[] = {
239		{ .event = "inst_retired.any",        .val = 300 },
240		{ .event = "cpu_clk_unhalted.thread", .val = 200 },
241		{ .event = NULL, },
242	};
243
244	TEST_ASSERT_VAL("failed to find recursion",
245			compute_metric("M1", vals, &ratio) == -1);
246
247	TEST_ASSERT_VAL("failed to find recursion",
248			compute_metric("M3", vals, &ratio) == -1);
249	return 0;
250}
251
252static int test_memory_bandwidth(void)
253{
254	double ratio;
255	struct value vals[] = {
256		{ .event = "l1d.replacement", .val = 4000000 },
257		{ .event = "duration_time",  .val = 200000000 },
258		{ .event = NULL, },
259	};
260
261	TEST_ASSERT_VAL("failed to compute metric",
262			compute_metric("L1D_Cache_Fill_BW", vals, &ratio) == 0);
263	TEST_ASSERT_VAL("L1D_Cache_Fill_BW, wrong ratio",
264			1.28 == ratio);
265
266	return 0;
267}
268
269static int test_metric_group(void)
270{
271	double ratio1, ratio2;
272	struct value vals[] = {
273		{ .event = "cpu_clk_unhalted.thread", .val = 200 },
274		{ .event = "l1d-loads-misses",        .val = 300 },
275		{ .event = "l1i-loads-misses",        .val = 200 },
276		{ .event = "inst_retired.any",        .val = 400 },
277		{ .event = NULL, },
278	};
279
280	TEST_ASSERT_VAL("failed to find recursion",
281			compute_metric_group("group1", vals,
282					     "IPC", &ratio1,
283					     "cache_miss_cycles", &ratio2) == 0);
284
285	TEST_ASSERT_VAL("group IPC failed, wrong ratio",
286			ratio1 == 2.0);
287
288	TEST_ASSERT_VAL("group cache_miss_cycles failed, wrong ratio",
289			ratio2 == 1.25);
290	return 0;
291}
292
293static int test__parse_metric(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
294{
295	TEST_ASSERT_VAL("IPC failed", test_ipc() == 0);
296	TEST_ASSERT_VAL("frontend failed", test_frontend() == 0);
297	TEST_ASSERT_VAL("DCache_L2 failed", test_dcache_l2() == 0);
298	TEST_ASSERT_VAL("recursion fail failed", test_recursion_fail() == 0);
299	TEST_ASSERT_VAL("Memory bandwidth", test_memory_bandwidth() == 0);
300	TEST_ASSERT_VAL("cache_miss_cycles failed", test_cache_miss_cycles() == 0);
301	TEST_ASSERT_VAL("test metric group", test_metric_group() == 0);
302	return 0;
303}
304
305DEFINE_SUITE("Parse and process metrics", parse_metric);