evlist.c

  1// SPDX-License-Identifier: GPL-2.0
  2#include <string.h>
  3#include "../../../util/evlist.h"
  4#include "../../../util/evsel.h"
  5#include "topdown.h"
  6#include "evsel.h"
  7
  8int arch_evlist__cmp(const struct evsel *lhs, const struct evsel *rhs)
  9{
 10	/*
 11	 * Currently the following topdown events sequence are supported to
 12	 * move and regroup correctly.
 13	 *
 14	 * a. all events in a group
 15	 *    perf stat -e "{instructions,topdown-retiring,slots}" -C0 sleep 1
 16	 *    WARNING: events were regrouped to match PMUs
 17	 *     Performance counter stats for 'CPU(s) 0':
 18	 *          15,066,240     slots
 19	 *          1,899,760      instructions
 20	 *          2,126,998      topdown-retiring
 21	 * b. all events not in a group
 22	 *    perf stat -e "instructions,topdown-retiring,slots" -C0 sleep 1
 23	 *    WARNING: events were regrouped to match PMUs
 24	 *     Performance counter stats for 'CPU(s) 0':
 25	 *          2,045,561      instructions
 26	 *          17,108,370     slots
 27	 *          2,281,116      topdown-retiring
 28	 * c. slots event in a group but topdown metrics events outside the group
 29	 *    perf stat -e "{instructions,slots},topdown-retiring" -C0 sleep 1
 30	 *    WARNING: events were regrouped to match PMUs
 31	 *     Performance counter stats for 'CPU(s) 0':
 32	 *         20,323,878      slots
 33	 *          2,634,884      instructions
 34	 *          3,028,656      topdown-retiring
 35	 * d. slots event and topdown metrics events in two groups
 36	 *    perf stat -e "{instructions,slots},{topdown-retiring}" -C0 sleep 1
 37	 *    WARNING: events were regrouped to match PMUs
 38	 *     Performance counter stats for 'CPU(s) 0':
 39	 *         26,319,024      slots
 40	 *          2,427,791      instructions
 41	 *          2,683,508      topdown-retiring
 42	 * e. slots event and metrics event are not in a group and not adjacent
 43	 *    perf stat -e "{instructions,slots},cycles,topdown-retiring" -C0 sleep 1
 44	 *    WARNING: events were regrouped to match PMUs
 45	 *         68,433,522      slots
 46	 *          8,856,102      topdown-retiring
 47	 *          7,791,494      instructions
 48	 *         11,469,513      cycles
 49	 */
 50	if (topdown_sys_has_perf_metrics() &&
 51	    (arch_evsel__must_be_in_group(lhs) || arch_evsel__must_be_in_group(rhs))) {
 52		/* Ensure the topdown slots comes first. */
 53		if (arch_is_topdown_slots(lhs))
 54			return -1;
 55		if (arch_is_topdown_slots(rhs))
 56			return 1;
 57
 58		/*
 59		 * Move topdown metrics events forward only when topdown metrics
 60		 * events are not in same group with previous slots event. If
 61		 * topdown metrics events are already in same group with slots
 62		 * event, do nothing.
 63		 */
 64		if (lhs->core.leader != rhs->core.leader) {
 65			bool lhs_topdown = arch_is_topdown_metrics(lhs);
 66			bool rhs_topdown = arch_is_topdown_metrics(rhs);
 67
 68			if (lhs_topdown && !rhs_topdown)
 69				return -1;
 70			if (!lhs_topdown && rhs_topdown)
 71				return 1;
 72		}
 73	}
 74
 75	/* Retire latency event should not be group leader*/
 76	if (lhs->retire_lat && !rhs->retire_lat)
 77		return 1;
 78	if (!lhs->retire_lat && rhs->retire_lat)
 79		return -1;
 80
 81	/* Default ordering by insertion index. */
 82	return lhs->core.idx - rhs->core.idx;
 83}
 84
 85int arch_evlist__add_required_events(struct list_head *list)
 86{
 87	struct evsel *pos, *metric_event = NULL;
 88	int idx = 0;
 89
 90	if (!topdown_sys_has_perf_metrics())
 91		return 0;
 92
 93	list_for_each_entry(pos, list, core.node) {
 94		if (arch_is_topdown_slots(pos)) {
 95			/* Slots event already present, nothing to do. */
 96			return 0;
 97		}
 98		if (metric_event == NULL && arch_is_topdown_metrics(pos))
 99			metric_event = pos;
100		idx++;
101	}
102	if (metric_event == NULL) {
103		/* No topdown metric events, nothing to do. */
104		return 0;
105	}
106	return topdown_insert_slots_event(list, idx + 1, metric_event);
107}