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256 lines
9.8 KiB
256 lines
9.8 KiB
4 months ago
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/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "event_attr.h"
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#include <inttypes.h>
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#include <stdio.h>
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#include <string>
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#include <unordered_map>
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#include <android-base/logging.h>
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#include "environment.h"
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#include "event_type.h"
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#include "utils.h"
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namespace simpleperf {
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static std::string BitsToString(const std::string& name, uint64_t bits,
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const std::vector<std::pair<int, std::string>>& bit_names) {
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std::string result;
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for (auto& p : bit_names) {
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if (bits & p.first) {
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bits &= ~p.first;
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if (!result.empty()) {
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result += ", ";
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}
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result += p.second;
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}
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}
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if (bits != 0) {
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LOG(DEBUG) << "unknown " << name << " bits: " << std::hex << bits;
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}
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return result;
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}
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static std::string SampleTypeToString(uint64_t sample_type) {
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static std::vector<std::pair<int, std::string>> sample_type_names = {
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{PERF_SAMPLE_ADDR, "addr"},
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{PERF_SAMPLE_BRANCH_STACK, "branch_stack"},
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{PERF_SAMPLE_CALLCHAIN, "callchain"},
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{PERF_SAMPLE_CPU, "cpu"},
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{PERF_SAMPLE_ID, "id"},
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{PERF_SAMPLE_IP, "ip"},
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{PERF_SAMPLE_PERIOD, "period"},
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{PERF_SAMPLE_RAW, "raw"},
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{PERF_SAMPLE_READ, "read"},
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{PERF_SAMPLE_REGS_USER, "regs_user"},
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{PERF_SAMPLE_STACK_USER, "stack_user"},
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{PERF_SAMPLE_STREAM_ID, "stream_id"},
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{PERF_SAMPLE_TID, "tid"},
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{PERF_SAMPLE_TIME, "time"},
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};
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return BitsToString("sample_type", sample_type, sample_type_names);
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}
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static std::string ReadFormatToString(uint64_t read_format) {
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static std::vector<std::pair<int, std::string>> read_format_names = {
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{PERF_FORMAT_TOTAL_TIME_ENABLED, "total_time_enabled"},
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{PERF_FORMAT_TOTAL_TIME_RUNNING, "total_time_running"},
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{PERF_FORMAT_ID, "id"},
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{PERF_FORMAT_GROUP, "group"},
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};
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return BitsToString("read_format", read_format, read_format_names);
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}
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perf_event_attr CreateDefaultPerfEventAttr(const EventType& event_type) {
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perf_event_attr attr;
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memset(&attr, 0, sizeof(attr));
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attr.size = sizeof(perf_event_attr);
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attr.type = event_type.type;
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attr.config = event_type.config;
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attr.disabled = 0;
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// Changing read_format affects the layout of the data read from perf_event_file, namely
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// PerfCounter in event_fd.h.
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attr.read_format =
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PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING | PERF_FORMAT_ID;
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attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID | PERF_SAMPLE_TIME | PERF_SAMPLE_PERIOD |
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PERF_SAMPLE_CPU | PERF_SAMPLE_ID;
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if (attr.type == PERF_TYPE_TRACEPOINT) {
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// Tracepoint information are stored in raw data in sample records.
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if (CanRecordRawData()) {
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attr.sample_type |= PERF_SAMPLE_RAW;
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}
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}
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return attr;
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}
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void DumpPerfEventAttr(const perf_event_attr& attr, size_t indent) {
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std::string event_name = GetEventNameByAttr(attr);
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PrintIndented(indent, "event_attr: for event type %s\n", event_name.c_str());
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PrintIndented(indent + 1, "type %u, size %u, config %llu\n", attr.type, attr.size, attr.config);
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if (attr.freq != 0) {
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PrintIndented(indent + 1, "sample_freq %llu\n", attr.sample_freq);
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} else {
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PrintIndented(indent + 1, "sample_period %llu\n", attr.sample_period);
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}
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PrintIndented(indent + 1, "sample_type (0x%llx) %s\n", attr.sample_type,
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SampleTypeToString(attr.sample_type).c_str());
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PrintIndented(indent + 1, "read_format (0x%llx) %s\n", attr.read_format,
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ReadFormatToString(attr.read_format).c_str());
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PrintIndented(indent + 1, "disabled %u, inherit %u, pinned %u, exclusive %u\n", attr.disabled,
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attr.inherit, attr.pinned, attr.exclusive);
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PrintIndented(indent + 1, "exclude_user %u, exclude_kernel %u, exclude_hv %u\n",
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attr.exclude_user, attr.exclude_kernel, attr.exclude_hv);
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PrintIndented(indent + 1, "exclude_idle %u, mmap %u, mmap2 %u, comm %u, freq %u\n",
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attr.exclude_idle, attr.mmap, attr.mmap2, attr.comm, attr.freq);
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PrintIndented(indent + 1, "inherit_stat %u, enable_on_exec %u, task %u\n", attr.inherit_stat,
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attr.enable_on_exec, attr.task);
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PrintIndented(indent + 1, "watermark %u, precise_ip %u, mmap_data %u\n", attr.watermark,
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attr.precise_ip, attr.mmap_data);
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PrintIndented(indent + 1, "sample_id_all %u, exclude_host %u, exclude_guest %u\n",
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attr.sample_id_all, attr.exclude_host, attr.exclude_guest);
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PrintIndented(indent + 1, "config2 0x%llx\n", attr.config2);
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PrintIndented(indent + 1, "branch_sample_type 0x%" PRIx64 "\n", attr.branch_sample_type);
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PrintIndented(indent + 1, "exclude_callchain_kernel %u, exclude_callchain_user %u\n",
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attr.exclude_callchain_kernel, attr.exclude_callchain_user);
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PrintIndented(indent + 1, "sample_regs_user 0x%" PRIx64 "\n", attr.sample_regs_user);
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PrintIndented(indent + 1, "sample_stack_user 0x%" PRIx64 "\n", attr.sample_stack_user);
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}
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bool GetCommonEventIdPositionsForAttrs(std::vector<perf_event_attr>& attrs,
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size_t* event_id_pos_in_sample_records,
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size_t* event_id_reverse_pos_in_non_sample_records) {
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// When there are more than one perf_event_attrs, we need to read event id
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// in each record to decide current record should use which attr. So
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// we need to determine the event id position in a record here.
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std::vector<uint64_t> sample_types;
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for (const auto& attr : attrs) {
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sample_types.push_back(attr.sample_type);
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}
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// First determine event_id_pos_in_sample_records.
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// If PERF_SAMPLE_IDENTIFIER is enabled, it is just after perf_event_header.
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// If PERF_SAMPLE_ID is enabled, then PERF_SAMPLE_IDENTIFIER | IP | TID | TIME | ADDR
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// should also be the same.
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bool identifier_enabled = true;
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bool id_enabled = true;
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uint64_t flags_before_id_mask = PERF_SAMPLE_IDENTIFIER | PERF_SAMPLE_IP | PERF_SAMPLE_TID |
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PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR;
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uint64_t flags_before_id = sample_types[0] & flags_before_id_mask;
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bool flags_before_id_are_the_same = true;
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for (auto type : sample_types) {
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identifier_enabled &= (type & PERF_SAMPLE_IDENTIFIER) != 0;
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id_enabled &= (type & PERF_SAMPLE_ID) != 0;
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flags_before_id_are_the_same &= (type & flags_before_id_mask) == flags_before_id;
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}
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if (identifier_enabled) {
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*event_id_pos_in_sample_records = sizeof(perf_event_header);
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} else if (id_enabled && flags_before_id_are_the_same) {
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uint64_t pos = sizeof(perf_event_header);
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while (flags_before_id != 0) {
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// Each flags takes 8 bytes in sample records.
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flags_before_id &= flags_before_id - 1;
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pos += 8;
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}
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*event_id_pos_in_sample_records = pos;
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} else {
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LOG(ERROR) << "perf_event_attrs don't have a common event id position in sample records";
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return false;
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}
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// Secondly determine event_id_reverse_pos_in_non_sample_record.
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// If sample_id_all is not enabled, there is no event id in non sample records.
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// If PERF_SAMPLE_IDENTIFIER is enabled, it is at the last 8 bytes of the record.
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// If PERF_SAMPLE_ID is enabled, then PERF_SAMPLE_IDENTIFIER | CPU | STREAM_ID should
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// also be the same.
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bool sample_id_all_enabled = true;
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for (const auto& attr : attrs) {
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if (attr.sample_id_all == 0) {
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sample_id_all_enabled = false;
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}
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}
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if (!sample_id_all_enabled) {
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LOG(ERROR) << "there are perf_event_attrs not enabling sample_id_all, so can't determine "
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<< "perf_event_attr for non sample records";
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return false;
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}
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uint64_t flags_after_id_mask = PERF_SAMPLE_IDENTIFIER | PERF_SAMPLE_CPU | PERF_SAMPLE_STREAM_ID;
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uint64_t flags_after_id = sample_types[0] & flags_after_id_mask;
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bool flags_after_id_are_the_same = true;
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for (auto type : sample_types) {
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flags_after_id_are_the_same &= (type & flags_after_id_mask) == flags_after_id;
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}
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if (identifier_enabled) {
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*event_id_reverse_pos_in_non_sample_records = 8;
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} else if (id_enabled && flags_after_id_are_the_same) {
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uint64_t pos = 8;
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while (flags_after_id != 0) {
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// Each flag takes 8 bytes in sample_id of non sample records.
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flags_after_id &= flags_after_id - 1;
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pos += 8;
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}
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*event_id_reverse_pos_in_non_sample_records = pos;
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} else {
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LOG(ERROR)
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<< "perf_event_attrs don't have a common event id reverse position in non sample records";
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return false;
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}
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return true;
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}
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bool IsTimestampSupported(const perf_event_attr& attr) {
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return attr.sample_id_all && (attr.sample_type & PERF_SAMPLE_TIME);
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}
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bool IsCpuSupported(const perf_event_attr& attr) {
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return attr.sample_id_all && (attr.sample_type & PERF_SAMPLE_CPU);
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}
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std::string GetEventNameByAttr(const perf_event_attr& attr) {
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std::string name = "unknown";
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auto callback = [&](const EventType& event_type) {
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// An event type uses both type and config value to define itself. But etm event type
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// only uses type value (whose config value is used to set etm options).
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if (event_type.type == attr.type &&
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(event_type.config == attr.config || event_type.IsEtmEvent())) {
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name = event_type.name;
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if (attr.exclude_user && !attr.exclude_kernel) {
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name += ":k";
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} else if (attr.exclude_kernel && !attr.exclude_user) {
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name += ":u";
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}
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return false;
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}
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return true;
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};
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EventTypeManager::Instance().ForEachType(callback);
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return name;
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}
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} // namespace simpleperf
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