mirror of https://github.com/torvalds/linux.git
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <stdio.h>
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#include <stdlib.h>
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#include "util/evsel.h"
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#include "util/env.h"
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#include "util/pmu.h"
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#include "linux/string.h"
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#include "evsel.h"
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void arch_evsel__set_sample_weight(struct evsel *evsel)
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{
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evsel__set_sample_bit(evsel, WEIGHT_STRUCT);
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}
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void arch_evsel__fixup_new_cycles(struct perf_event_attr *attr)
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{
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struct perf_env env = { .total_mem = 0, } ;
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if (!perf_env__cpuid(&env))
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return;
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/*
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* On AMD, precise cycles event sampling internally uses IBS pmu.
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* But IBS does not have filtering capabilities and perf by default
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* sets exclude_guest = 1. This makes IBS pmu event init fail and
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* thus perf ends up doing non-precise sampling. Avoid it by clearing
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* exclude_guest.
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*/
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if (env.cpuid && strstarts(env.cpuid, "AuthenticAMD"))
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attr->exclude_guest = 0;
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free(env.cpuid);
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}
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/* Check whether the evsel's PMU supports the perf metrics */
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bool evsel__sys_has_perf_metrics(const struct evsel *evsel)
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{
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const char *pmu_name = evsel->pmu_name ? evsel->pmu_name : "cpu";
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/*
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* The PERF_TYPE_RAW type is the core PMU type, e.g., "cpu" PMU
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* on a non-hybrid machine, "cpu_core" PMU on a hybrid machine.
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* The slots event is only available for the core PMU, which
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* supports the perf metrics feature.
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* Checking both the PERF_TYPE_RAW type and the slots event
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* should be good enough to detect the perf metrics feature.
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*/
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if ((evsel->core.attr.type == PERF_TYPE_RAW) &&
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pmu_have_event(pmu_name, "slots"))
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return true;
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return false;
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}
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bool arch_evsel__must_be_in_group(const struct evsel *evsel)
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{
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if (!evsel__sys_has_perf_metrics(evsel))
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return false;
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return evsel->name &&
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(strcasestr(evsel->name, "slots") ||
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strcasestr(evsel->name, "topdown"));
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}
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