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