96 lines
3.7 KiB
C
96 lines
3.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <string.h>
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#include "../../../util/evlist.h"
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#include "../../../util/evsel.h"
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#include "topdown.h"
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#include "evsel.h"
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int arch_evlist__cmp(const struct evsel *lhs, const struct evsel *rhs)
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{
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/*
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* Currently the following topdown events sequence are supported to
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* move and regroup correctly.
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*
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* a. all events in a group
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* perf stat -e "{instructions,topdown-retiring,slots}" -C0 sleep 1
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* WARNING: events were regrouped to match PMUs
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* Performance counter stats for 'CPU(s) 0':
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* 15,066,240 slots
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* 1,899,760 instructions
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* 2,126,998 topdown-retiring
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* b. all events not in a group
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* perf stat -e "instructions,topdown-retiring,slots" -C0 sleep 1
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* WARNING: events were regrouped to match PMUs
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* Performance counter stats for 'CPU(s) 0':
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* 2,045,561 instructions
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* 17,108,370 slots
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* 2,281,116 topdown-retiring
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* c. slots event in a group but topdown metrics events outside the group
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* perf stat -e "{instructions,slots},topdown-retiring" -C0 sleep 1
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* WARNING: events were regrouped to match PMUs
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* Performance counter stats for 'CPU(s) 0':
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* 20,323,878 slots
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* 2,634,884 instructions
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* 3,028,656 topdown-retiring
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* d. slots event and topdown metrics events in two groups
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* perf stat -e "{instructions,slots},{topdown-retiring}" -C0 sleep 1
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* WARNING: events were regrouped to match PMUs
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* Performance counter stats for 'CPU(s) 0':
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* 26,319,024 slots
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* 2,427,791 instructions
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* 2,683,508 topdown-retiring
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*
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* If slots event and topdown metrics events are not in same group, the
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* topdown metrics events must be first event after the slots event group,
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* otherwise topdown metrics events can't be regrouped correctly, e.g.
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*
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* a. perf stat -e "{instructions,slots},cycles,topdown-retiring" -C0 sleep 1
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* WARNING: events were regrouped to match PMUs
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* Performance counter stats for 'CPU(s) 0':
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* 17,923,134 slots
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* 2,154,855 instructions
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* 3,015,058 cycles
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* <not supported> topdown-retiring
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*
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* If slots event and topdown metrics events are in two groups, the group which
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* has topdown metrics events must contain only the topdown metrics event,
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* otherwise topdown metrics event can't be regrouped correctly as well, e.g.
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*
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* a. perf stat -e "{instructions,slots},{topdown-retiring,cycles}" -C0 sleep 1
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* WARNING: events were regrouped to match PMUs
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* Error:
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* The sys_perf_event_open() syscall returned with 22 (Invalid argument) for
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* event (topdown-retiring)
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*/
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if (topdown_sys_has_perf_metrics() &&
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(arch_evsel__must_be_in_group(lhs) || arch_evsel__must_be_in_group(rhs))) {
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/* Ensure the topdown slots comes first. */
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if (arch_is_topdown_slots(lhs))
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return -1;
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if (arch_is_topdown_slots(rhs))
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return 1;
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/*
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* Move topdown metrics events forward only when topdown metrics
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* events are not in same group with previous slots event. If
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* topdown metrics events are already in same group with slots
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* event, do nothing.
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*/
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if (arch_is_topdown_metrics(lhs) && !arch_is_topdown_metrics(rhs) &&
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lhs->core.leader != rhs->core.leader)
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return -1;
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if (!arch_is_topdown_metrics(lhs) && arch_is_topdown_metrics(rhs) &&
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lhs->core.leader != rhs->core.leader)
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return 1;
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}
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/* Retire latency event should not be group leader*/
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if (lhs->retire_lat && !rhs->retire_lat)
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return 1;
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if (!lhs->retire_lat && rhs->retire_lat)
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return -1;
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/* Default ordering by insertion index. */
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return lhs->core.idx - rhs->core.idx;
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}
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