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flutter / third_party / perfetto / c9968957f0f9aac66be5d2c6c4116bfcaea42c6d / . / src / perfetto_cmd / perfetto_cmd.cc
blob: 5818c59353370be0505ada0eb909771d681e45a0 [file] [log] [blame]
/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "src/perfetto_cmd/perfetto_cmd.h"
#include "perfetto/base/build_config.h"
#include "perfetto/base/proc_utils.h"
#include "perfetto/ext/base/scoped_file.h"
#include <fcntl.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
// For dup() (and _setmode() on windows).
#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
#include <fcntl.h>
#include <io.h>
#else
#include <unistd.h>
#endif
#include <chrono>
#include <fstream>
#include <iostream>
#include <iterator>
#include <random>
#include <sstream>
#include <thread>
#include "perfetto/base/compiler.h"
#include "perfetto/base/logging.h"
#include "perfetto/base/time.h"
#include "perfetto/ext/base/android_utils.h"
#include "perfetto/ext/base/ctrl_c_handler.h"
#include "perfetto/ext/base/file_utils.h"
#include "perfetto/ext/base/getopt.h"
#include "perfetto/ext/base/pipe.h"
#include "perfetto/ext/base/string_view.h"
#include "perfetto/ext/base/thread_utils.h"
#include "perfetto/ext/base/utils.h"
#include "perfetto/ext/base/uuid.h"
#include "perfetto/ext/base/version.h"
#include "perfetto/ext/traced/traced.h"
#include "perfetto/ext/tracing/core/basic_types.h"
#include "perfetto/ext/tracing/core/trace_packet.h"
#include "perfetto/ext/tracing/ipc/default_socket.h"
#include "perfetto/protozero/proto_utils.h"
#include "perfetto/tracing/core/data_source_descriptor.h"
#include "perfetto/tracing/core/trace_config.h"
#include "perfetto/tracing/core/tracing_service_state.h"
#include "src/android_stats/statsd_logging_helper.h"
#include "src/perfetto_cmd/config.h"
#include "src/perfetto_cmd/packet_writer.h"
#include "src/perfetto_cmd/pbtxt_to_pb.h"
#include "src/perfetto_cmd/trigger_producer.h"
#include "protos/perfetto/common/ftrace_descriptor.gen.h"
#include "protos/perfetto/common/tracing_service_state.gen.h"
#include "protos/perfetto/common/track_event_descriptor.gen.h"
namespace perfetto {
namespace {
perfetto::PerfettoCmd* g_perfetto_cmd;
uint32_t kOnTraceDataTimeoutMs = 3000;
class LoggingErrorReporter : public ErrorReporter {
public:
LoggingErrorReporter(std::string file_name, const char* config)
: file_name_(file_name), config_(config) {}
void AddError(size_t row,
size_t column,
size_t length,
const std::string& message) override {
parsed_successfully_ = false;
std::string line = ExtractLine(row - 1).ToStdString();
if (!line.empty() && line[line.length() - 1] == '\n') {
line.erase(line.length() - 1);
}
std::string guide(column + length, ' ');
for (size_t i = column; i < column + length; i++) {
guide[i - 1] = i == column ? '^' : '~';
}
fprintf(stderr, "%s:%zu:%zu error: %s\n", file_name_.c_str(), row, column,
message.c_str());
fprintf(stderr, "%s\n", line.c_str());
fprintf(stderr, "%s\n", guide.c_str());
}
bool Success() const { return parsed_successfully_; }
private:
base::StringView ExtractLine(size_t line) {
const char* start = config_;
const char* end = config_;
for (size_t i = 0; i < line + 1; i++) {
start = end;
char c;
while ((c = *end++) && c != '\n')
;
}
return base::StringView(start, static_cast<size_t>(end - start));
}
bool parsed_successfully_ = true;
std::string file_name_;
const char* config_;
};
bool ParseTraceConfigPbtxt(const std::string& file_name,
const std::string& pbtxt,
TraceConfig* config) {
LoggingErrorReporter reporter(file_name, pbtxt.c_str());
std::vector<uint8_t> buf = PbtxtToPb(pbtxt, &reporter);
if (!reporter.Success())
return false;
if (!config->ParseFromArray(buf.data(), buf.size()))
return false;
return true;
}
bool IsUserBuild() {
#if PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
std::string build_type = base::GetAndroidProp("ro.build.type");
if (build_type.empty()) {
PERFETTO_ELOG("Unable to read ro.build.type: assuming user build");
return true;
}
return build_type == "user";
#else
return false;
#endif // PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
}
base::Optional<PerfettoStatsdAtom> ConvertRateLimiterResponseToAtom(
RateLimiter::ShouldTraceResponse resp) {
switch (resp) {
case RateLimiter::kNotAllowedOnUserBuild:
return PerfettoStatsdAtom::kCmdUserBuildTracingNotAllowed;
case RateLimiter::kFailedToInitState:
return PerfettoStatsdAtom::kCmdFailedToInitGuardrailState;
case RateLimiter::kInvalidState:
return PerfettoStatsdAtom::kCmdInvalidGuardrailState;
case RateLimiter::kHitUploadLimit:
return PerfettoStatsdAtom::kCmdHitUploadLimit;
case RateLimiter::kOkToTrace:
return base::nullopt;
}
PERFETTO_FATAL("For GCC");
}
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
// Reports trace with `uuid` being finalized to the trace marker.
//
// This reimplements parts of android libcutils, because:
// * libcutils is not exposed to the NDK and cannot be used from standalone
// perfetto
// * libcutils atrace uses properties to enable tags, which are not required in
// this case.
void ReportFinalizeTraceUuidToAtrace(const base::Uuid& uuid) {
base::ScopedFile file =
base::OpenFile("/sys/kernel/tracing/trace_marker", O_WRONLY);
if (!file) {
file = base::OpenFile("/sys/kernel/debug/tracing/trace_marker", O_WRONLY);
if (!file) {
return;
}
}
base::StackString<100> uuid_slice("N|%d|OtherTraces|finalize-uuid-%s",
base::GetProcessId(),
uuid.ToPrettyString().c_str());
PERFETTO_EINTR(write(file.get(), uuid_slice.c_str(), uuid_slice.len()));
}
#endif // PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
} // namespace
const char* kStateDir = "/data/misc/perfetto-traces";
PerfettoCmd::PerfettoCmd() {
PERFETTO_DCHECK(!g_perfetto_cmd);
g_perfetto_cmd = this;
}
PerfettoCmd::~PerfettoCmd() {
PERFETTO_DCHECK(g_perfetto_cmd == this);
g_perfetto_cmd = nullptr;
if (ctrl_c_handler_installed_) {
task_runner_.RemoveFileDescriptorWatch(ctrl_c_evt_.fd());
}
}
void PerfettoCmd::PrintUsage(const char* argv0) {
fprintf(stderr, R"(
Usage: %s
--background -d : Exits immediately and continues in the background.
Prints the PID of the bg process. The printed PID
can used to gracefully terminate the tracing
session by issuing a `kill -TERM $PRINTED_PID`.
--background-wait -D : Like --background, but waits (up to 30s) for all
data sources to be started before exiting. Exit
code is zero if a successful acknowledgement is
received, non-zero otherwise (error or timeout).
--clone TSID : Creates a read-only clone of an existing tracing
session, identified by its ID (see --query).
--config -c : /path/to/trace/config/file or - for stdin
--out -o : /path/to/out/trace/file or - for stdout
--txt : Parse config as pbtxt. Not for production use.
Not a stable API.
--query : Queries the service state and prints it as
human-readable text.
--query-raw : Like --query, but prints raw proto-encoded bytes
of tracing_service_state.proto.
--help -h
Light configuration flags: (only when NOT using -c/--config)
--time -t : Trace duration N[s,m,h] (default: 10s)
--buffer -b : Ring buffer size N[mb,gb] (default: 32mb)
--size -s : Max file size N[mb,gb]
(default: in-memory ring-buffer only)
--app -a : Android (atrace) app name
FTRACE_GROUP/FTRACE_NAME : Record ftrace event (e.g. sched/sched_switch)
ATRACE_CAT : Record ATRACE_CAT (e.g. wm) (Android only)
Statsd-specific and other Android-only flags:
--alert-id : ID of the alert that triggered this trace.
--config-id : ID of the triggering config.
--config-uid : UID of app which registered the config.
--subscription-id : ID of the subscription that triggered this trace.
--upload : Upload trace.
--dropbox TAG : DEPRECATED: Use --upload instead
TAG should always be set to 'perfetto'.
--save-for-bugreport : If a trace with bugreport_score > 0 is running, it
saves it into a file. Outputs the path when done.
--no-guardrails : Ignore guardrails triggered when using --upload
(testing only).
--reset-guardrails : Resets the state of the guardails and exits
(testing only).
Detach mode. DISCOURAGED, read https://perfetto.dev/docs/concepts/detached-mode
--detach=key : Detach from the tracing session with the given key.
--attach=key [--stop] : Re-attach to the session (optionally stop tracing
once reattached).
--is_detached=key : Check if the session can be re-attached.
Exit code: 0:Yes, 2:No, 1:Error.
)", /* this comment fixes syntax highlighting in some editors */
argv0);
}
base::Optional<int> PerfettoCmd::ParseCmdlineAndMaybeDaemonize(int argc,
char** argv) {
#if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
umask(0000); // make sure that file creation is not affected by umask.
#endif
enum LongOption {
OPT_ALERT_ID = 1000,
OPT_BUGREPORT,
OPT_CLONE,
OPT_CONFIG_ID,
OPT_CONFIG_UID,
OPT_SUBSCRIPTION_ID,
OPT_RESET_GUARDRAILS,
OPT_PBTXT_CONFIG,
OPT_DROPBOX,
OPT_UPLOAD,
OPT_IGNORE_GUARDRAILS,
OPT_DETACH,
OPT_ATTACH,
OPT_IS_DETACHED,
OPT_STOP,
OPT_QUERY,
OPT_QUERY_RAW,
OPT_VERSION,
};
static const option long_options[] = {
{"help", no_argument, nullptr, 'h'},
{"config", required_argument, nullptr, 'c'},
{"out", required_argument, nullptr, 'o'},
{"background", no_argument, nullptr, 'd'},
{"background-wait", no_argument, nullptr, 'D'},
{"time", required_argument, nullptr, 't'},
{"buffer", required_argument, nullptr, 'b'},
{"size", required_argument, nullptr, 's'},
{"app", required_argument, nullptr, 'a'},
{"no-guardrails", no_argument, nullptr, OPT_IGNORE_GUARDRAILS},
{"txt", no_argument, nullptr, OPT_PBTXT_CONFIG},
{"upload", no_argument, nullptr, OPT_UPLOAD},
{"dropbox", required_argument, nullptr, OPT_DROPBOX},
{"alert-id", required_argument, nullptr, OPT_ALERT_ID},
{"config-id", required_argument, nullptr, OPT_CONFIG_ID},
{"config-uid", required_argument, nullptr, OPT_CONFIG_UID},
{"subscription-id", required_argument, nullptr, OPT_SUBSCRIPTION_ID},
{"reset-guardrails", no_argument, nullptr, OPT_RESET_GUARDRAILS},
{"detach", required_argument, nullptr, OPT_DETACH},
{"attach", required_argument, nullptr, OPT_ATTACH},
{"clone", required_argument, nullptr, OPT_CLONE},
{"is_detached", required_argument, nullptr, OPT_IS_DETACHED},
{"stop", no_argument, nullptr, OPT_STOP},
{"query", no_argument, nullptr, OPT_QUERY},
{"query-raw", no_argument, nullptr, OPT_QUERY_RAW},
{"version", no_argument, nullptr, OPT_VERSION},
{"save-for-bugreport", no_argument, nullptr, OPT_BUGREPORT},
{nullptr, 0, nullptr, 0}};
std::string config_file_name;
std::string trace_config_raw;
bool parse_as_pbtxt = false;
TraceConfig::StatsdMetadata statsd_metadata;
limiter_.reset(new RateLimiter());
ConfigOptions config_options;
bool has_config_options = false;
if (argc <= 1) {
PrintUsage(argv[0]);
return 1;
}
for (;;) {
int option =
getopt_long(argc, argv, "hc:o:dDt:b:s:a:", long_options, nullptr);
if (option == -1)
break; // EOF.
if (option == 'c') {
config_file_name = std::string(optarg);
if (strcmp(optarg, "-") == 0) {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
// We don't want the runtime to replace "\n" with "\r\n" on `std::cin`.
_setmode(_fileno(stdin), _O_BINARY);
#endif
std::istreambuf_iterator<char> begin(std::cin), end;
trace_config_raw.assign(begin, end);
} else if (strcmp(optarg, ":test") == 0) {
TraceConfig test_config;
ConfigOptions opts;
opts.time = "2s";
opts.categories.emplace_back("sched/sched_switch");
opts.categories.emplace_back("power/cpu_idle");
opts.categories.emplace_back("power/cpu_frequency");
opts.categories.emplace_back("power/gpu_frequency");
PERFETTO_CHECK(CreateConfigFromOptions(opts, &test_config));
trace_config_raw = test_config.SerializeAsString();
} else {
if (!base::ReadFile(optarg, &trace_config_raw)) {
PERFETTO_PLOG("Could not open %s", optarg);
return 1;
}
}
continue;
}
if (option == 'o') {
trace_out_path_ = optarg;
continue;
}
if (option == 'd') {
background_ = true;
continue;
}
if (option == 'D') {
background_ = true;
background_wait_ = true;
continue;
}
if (option == OPT_CLONE) {
clone_tsid_ = static_cast<TracingSessionID>(atoll(optarg));
continue;
}
if (option == 't') {
has_config_options = true;
config_options.time = std::string(optarg);
continue;
}
if (option == 'b') {
has_config_options = true;
config_options.buffer_size = std::string(optarg);
continue;
}
if (option == 's') {
has_config_options = true;
config_options.max_file_size = std::string(optarg);
continue;
}
if (option == 'a') {
config_options.atrace_apps.push_back(std::string(optarg));
has_config_options = true;
continue;
}
if (option == OPT_UPLOAD) {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
upload_flag_ = true;
continue;
#else
PERFETTO_ELOG("--upload is only supported on Android");
return 1;
#endif
}
if (option == OPT_DROPBOX) {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
PERFETTO_CHECK(optarg);
upload_flag_ = true;
continue;
#else
PERFETTO_ELOG("--dropbox is only supported on Android");
return 1;
#endif
}
if (option == OPT_PBTXT_CONFIG) {
parse_as_pbtxt = true;
continue;
}
if (option == OPT_IGNORE_GUARDRAILS) {
ignore_guardrails_ = true;
continue;
}
if (option == OPT_RESET_GUARDRAILS) {
PERFETTO_CHECK(limiter_->ClearState());
PERFETTO_ILOG("Guardrail state cleared");
return 0;
}
if (option == OPT_ALERT_ID) {
statsd_metadata.set_triggering_alert_id(atoll(optarg));
continue;
}
if (option == OPT_CONFIG_ID) {
statsd_metadata.set_triggering_config_id(atoll(optarg));
continue;
}
if (option == OPT_CONFIG_UID) {
statsd_metadata.set_triggering_config_uid(atoi(optarg));
continue;
}
if (option == OPT_SUBSCRIPTION_ID) {
statsd_metadata.set_triggering_subscription_id(atoll(optarg));
continue;
}
if (option == OPT_DETACH) {
detach_key_ = std::string(optarg);
PERFETTO_CHECK(!detach_key_.empty());
continue;
}
if (option == OPT_ATTACH) {
attach_key_ = std::string(optarg);
PERFETTO_CHECK(!attach_key_.empty());
continue;
}
if (option == OPT_IS_DETACHED) {
attach_key_ = std::string(optarg);
redetach_once_attached_ = true;
PERFETTO_CHECK(!attach_key_.empty());
continue;
}
if (option == OPT_STOP) {
stop_trace_once_attached_ = true;
continue;
}
if (option == OPT_QUERY) {
query_service_ = true;
continue;
}
if (option == OPT_QUERY_RAW) {
query_service_ = true;
query_service_output_raw_ = true;
continue;
}
if (option == OPT_VERSION) {
printf("%s\n", base::GetVersionString());
return 0;
}
if (option == OPT_BUGREPORT) {
bugreport_ = true;
continue;
}
PrintUsage(argv[0]);
return 1;
}
for (ssize_t i = optind; i < argc; i++) {
has_config_options = true;
config_options.categories.push_back(argv[i]);
}
if (query_service_ && (is_detach() || is_attach() || background_)) {
PERFETTO_ELOG("--query cannot be combined with any other argument");
return 1;
}
if (is_detach() && is_attach()) {
PERFETTO_ELOG("--attach and --detach are mutually exclusive");
return 1;
}
if (is_detach() && background_) {
PERFETTO_ELOG("--detach and --background are mutually exclusive");
return 1;
}
if (stop_trace_once_attached_ && !is_attach()) {
PERFETTO_ELOG("--stop is supported only in combination with --attach");
return 1;
}
if (bugreport_ && (is_attach() || is_detach() || query_service_ ||
has_config_options || background_wait_)) {
PERFETTO_ELOG("--save-for-bugreport cannot take any other argument");
return 1;
}
// Parse the trace config. It can be either:
// 1) A proto-encoded file/stdin (-c ...).
// 2) A proto-text file/stdin (-c ... --txt).
// 3) A set of option arguments (-t 10s -s 10m).
// The only cases in which a trace config is not expected is --attach.
// For this we are just acting on already existing sessions.
trace_config_.reset(new TraceConfig());
bool parsed = false;
const bool will_trace_or_trigger =
!is_attach() && !query_service_ && !bugreport_;
if (!will_trace_or_trigger || clone_tsid_) {
if ((!trace_config_raw.empty() || has_config_options)) {
PERFETTO_ELOG("Cannot specify a trace config with this option");
return 1;
}
} else if (has_config_options) {
if (!trace_config_raw.empty()) {
PERFETTO_ELOG(
"Cannot specify both -c/--config and any of --time, --size, "
"--buffer, --app, ATRACE_CAT, FTRACE_EVENT");
return 1;
}
parsed = CreateConfigFromOptions(config_options, trace_config_.get());
} else {
if (trace_config_raw.empty()) {
PERFETTO_ELOG("The TraceConfig is empty");
return 1;
}
PERFETTO_DLOG("Parsing TraceConfig, %zu bytes", trace_config_raw.size());
if (parse_as_pbtxt) {
parsed = ParseTraceConfigPbtxt(config_file_name, trace_config_raw,
trace_config_.get());
} else {
parsed = trace_config_->ParseFromString(trace_config_raw);
}
}
if (parsed) {
*trace_config_->mutable_statsd_metadata() = std::move(statsd_metadata);
trace_config_raw.clear();
} else if (will_trace_or_trigger && !clone_tsid_) {
PERFETTO_ELOG("The trace config is invalid, bailing out.");
return 1;
}
if (trace_config_->trace_uuid_lsb() == 0 &&
trace_config_->trace_uuid_msb() == 0) {
base::Uuid uuid = base::Uuidv4();
if (trace_config_->statsd_metadata().triggering_subscription_id()) {
uuid.set_lsb(
trace_config_->statsd_metadata().triggering_subscription_id());
}
uuid_ = uuid.ToString();
trace_config_->set_trace_uuid_msb(uuid.msb());
trace_config_->set_trace_uuid_lsb(uuid.lsb());
} else {
base::Uuid uuid(trace_config_->trace_uuid_lsb(),
trace_config_->trace_uuid_msb());
uuid_ = uuid.ToString();
}
const auto& delay = trace_config_->cmd_trace_start_delay();
if (delay.has_max_delay_ms() != delay.has_min_delay_ms()) {
PERFETTO_ELOG("cmd_trace_start_delay field is only partially specified.");
return 1;
}
bool has_incidentd_package =
!trace_config_->incident_report_config().destination_package().empty();
if (has_incidentd_package && !upload_flag_) {
PERFETTO_ELOG(
"Unexpected IncidentReportConfig without --dropbox / --upload.");
return 1;
}
bool has_android_reporter_package = !trace_config_->android_report_config()
.reporter_service_package()
.empty();
if (has_android_reporter_package && !upload_flag_) {
PERFETTO_ELOG(
"Unexpected AndroidReportConfig without --dropbox / --upload.");
return 1;
}
if (has_incidentd_package && has_android_reporter_package) {
PERFETTO_ELOG(
"Only one of IncidentReportConfig and AndroidReportConfig "
"allowed in the same config.");
return 1;
}
// If the upload flag is set, we can only be doing one of three things:
// 1. Reporting to either incidentd or Android framework.
// 2. Skipping incidentd/Android report because it was explicitly
// specified in the config.
// 3. Activating triggers.
bool incidentd_valid =
has_incidentd_package ||
trace_config_->incident_report_config().skip_incidentd();
bool android_report_valid =
has_android_reporter_package ||
trace_config_->android_report_config().skip_report();
bool has_triggers = !trace_config_->activate_triggers().empty();
if (upload_flag_ && !incidentd_valid && !android_report_valid &&
!has_triggers) {
PERFETTO_ELOG(
"One of IncidentReportConfig, AndroidReportConfig or activate_triggers "
"must be specified with --dropbox / --upload.");
return 1;
}
// Only save to incidentd if:
// 1) |destination_package| is set
// 2) |skip_incidentd| is absent or false.
// 3) we are not simply activating triggers.
save_to_incidentd_ =
has_incidentd_package &&
!trace_config_->incident_report_config().skip_incidentd() &&
!has_triggers;
// Only report to the Andorid framework if:
// 1) |reporter_service_package| is set
// 2) |skip_report| is absent or false.
// 3) we are not simply activating triggers.
report_to_android_framework_ =
has_android_reporter_package &&
!trace_config_->android_report_config().skip_report() && !has_triggers;
// Respect the wishes of the config with respect to statsd logging or fall
// back on the presence of the --upload flag if not set.
switch (trace_config_->statsd_logging()) {
case TraceConfig::STATSD_LOGGING_ENABLED:
statsd_logging_ = true;
break;
case TraceConfig::STATSD_LOGGING_DISABLED:
statsd_logging_ = false;
break;
case TraceConfig::STATSD_LOGGING_UNSPECIFIED:
statsd_logging_ = upload_flag_;
break;
}
trace_config_->set_statsd_logging(statsd_logging_
? TraceConfig::STATSD_LOGGING_ENABLED
: TraceConfig::STATSD_LOGGING_DISABLED);
// Set up the output file. Either --out or --upload are expected, with the
// only exception of --attach. In this case the output file is passed when
// detaching.
if (!trace_out_path_.empty() && upload_flag_) {
PERFETTO_ELOG(
"Can't log to a file (--out) and incidentd (--upload) at the same "
"time");
return 1;
}
if (!trace_config_->output_path().empty()) {
if (!trace_out_path_.empty() || upload_flag_) {
PERFETTO_ELOG(
"Can't pass --out or --upload if output_path is set in the "
"trace config");
return 1;
}
if (base::FileExists(trace_config_->output_path())) {
PERFETTO_ELOG(
"The output_path must not exist, the service cannot overwrite "
"existing files for security reasons. Remove %s or use a different "
"path.",
trace_config_->output_path().c_str());
return 1;
}
}
// |activate_triggers| in the trace config is shorthand for trigger_perfetto.
// In this case we don't intend to send any trace config to the service,
// rather use that as a signal to the cmdline client to connect as a producer
// and activate triggers.
if (has_triggers) {
for (const auto& trigger : trace_config_->activate_triggers()) {
triggers_to_activate_.push_back(trigger);
}
trace_config_.reset(new TraceConfig());
}
bool open_out_file = true;
if (!will_trace_or_trigger) {
open_out_file = false;
if (!trace_out_path_.empty() || upload_flag_) {
PERFETTO_ELOG("Can't pass an --out file (or --upload) with this option");
return 1;
}
} else if (!triggers_to_activate_.empty() ||
(trace_config_->write_into_file() &&
!trace_config_->output_path().empty())) {
open_out_file = false;
} else if (trace_out_path_.empty() && !upload_flag_) {
PERFETTO_ELOG("Either --out or --upload is required");
return 1;
} else if (is_detach() && !trace_config_->write_into_file()) {
// In detached mode we must pass the file descriptor to the service and
// let that one write the trace. We cannot use the IPC readback code path
// because the client process is about to exit soon after detaching.
// We could support detach && !write_into_file, but that would make the
// cmdline logic more complex. The feasible configurations are:
// 1. Using write_into_file and passing the file path on the --detach call.
// 2. Using pure ring-buffer mode, setting write_into_file = false and
// passing the output file path to the --attach call.
// This is too complicated and harder to reason about, so we support only 1.
// Traceur gets around this by always setting write_into_file and specifying
// file_write_period_ms = 1week (which effectively means: write into the
// file only at the end of the trace) to achieve ring buffer traces.
PERFETTO_ELOG(
"TraceConfig's write_into_file must be true when using --detach");
return 1;
}
if (open_out_file) {
if (!OpenOutputFile())
return 1;
if (!trace_config_->write_into_file())
packet_writer_ = CreateFilePacketWriter(trace_out_stream_.get());
}
if (trace_config_->compression_type() ==
TraceConfig::COMPRESSION_TYPE_DEFLATE) {
if (packet_writer_) {
#if PERFETTO_BUILDFLAG(PERFETTO_ZLIB)
packet_writer_ = CreateZipPacketWriter(std::move(packet_writer_));
#else
PERFETTO_ELOG("Cannot compress. Zlib not enabled in the build config");
#endif
} else {
PERFETTO_ELOG("Cannot compress when tracing directly to file.");
}
}
bool will_trace_indefinitely =
trace_config_->duration_ms() == 0 &&
trace_config_->trigger_config().trigger_timeout_ms() == 0;
if (will_trace_indefinitely && save_to_incidentd_ && !ignore_guardrails_) {
PERFETTO_ELOG("Can't trace indefinitely when tracing to Incidentd.");
return 1;
}
if (will_trace_indefinitely && report_to_android_framework_ &&
!ignore_guardrails_) {
PERFETTO_ELOG(
"Can't trace indefinitely when reporting to Android framework.");
return 1;
}
if (background_) {
if (background_wait_) {
#if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
background_wait_pipe_ = base::Pipe::Create(base::Pipe::kRdNonBlock);
#endif
}
base::Daemonize([this]() -> int {
background_wait_pipe_.wr.reset();
if (background_wait_) {
return WaitOnBgProcessPipe();
}
return 0;
});
background_wait_pipe_.rd.reset();
}
return base::nullopt; // Continues in ConnectToServiceRunAndMaybeNotify()
// below.
}
void PerfettoCmd::NotifyBgProcessPipe(BgProcessStatus status) {
#if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
if (!background_wait_pipe_.wr) {
return;
}
static_assert(sizeof status == 1, "Enum bigger than one byte");
PERFETTO_EINTR(write(background_wait_pipe_.wr.get(), &status, 1));
background_wait_pipe_.wr.reset();
#else // PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
base::ignore_result(status);
#endif //! PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
}
PerfettoCmd::BgProcessStatus PerfettoCmd::WaitOnBgProcessPipe() {
#if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
base::ScopedPlatformHandle fd = std::move(background_wait_pipe_.rd);
PERFETTO_CHECK(fd);
BgProcessStatus msg;
static_assert(sizeof msg == 1, "Enum bigger than one byte");
std::array<pollfd, 1> pollfds = {pollfd{fd.get(), POLLIN, 0}};
int ret = PERFETTO_EINTR(poll(&pollfds[0], pollfds.size(), 30000 /*ms*/));
PERFETTO_CHECK(ret >= 0);
if (ret == 0) {
fprintf(stderr, "Timeout waiting for all data sources to start\n");
return kBackgroundTimeout;
}
ssize_t read_ret = PERFETTO_EINTR(read(fd.get(), &msg, 1));
PERFETTO_CHECK(read_ret >= 0);
if (read_ret == 0) {
fprintf(stderr, "Background process didn't report anything\n");
return kBackgroundOtherError;
}
if (msg != kBackgroundOk) {
fprintf(stderr, "Background process failed, BgProcessStatus=%d\n",
static_cast<int>(msg));
return msg;
}
#endif //! PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
return kBackgroundOk;
}
int PerfettoCmd::ConnectToServiceRunAndMaybeNotify() {
int exit_code = ConnectToServiceAndRun();
NotifyBgProcessPipe(exit_code == 0 ? kBackgroundOk : kBackgroundOtherError);
return exit_code;
}
int PerfettoCmd::ConnectToServiceAndRun() {
// If we are just activating triggers then we don't need to rate limit,
// connect as a consumer or run the trace. So bail out after processing all
// the options.
if (!triggers_to_activate_.empty()) {
LogTriggerEvents(PerfettoTriggerAtom::kCmdTrigger, triggers_to_activate_);
bool finished_with_success = false;
auto weak_this = weak_factory_.GetWeakPtr();
TriggerProducer producer(
&task_runner_,
[weak_this, &finished_with_success](bool success) {
if (!weak_this)
return;
finished_with_success = success;
weak_this->task_runner_.Quit();
},
&triggers_to_activate_);
task_runner_.Run();
if (!finished_with_success) {
LogTriggerEvents(PerfettoTriggerAtom::kCmdTriggerFail,
triggers_to_activate_);
}
return finished_with_success ? 0 : 1;
} // if (triggers_to_activate_)
if (query_service_ || bugreport_) {
consumer_endpoint_ =
ConsumerIPCClient::Connect(GetConsumerSocket(), this, &task_runner_);
task_runner_.Run();
return 1; // We can legitimately get here if the service disconnects.
} // if (query_service || bugreport_)
RateLimiter::Args args{};
args.is_user_build = IsUserBuild();
args.is_uploading = save_to_incidentd_ || report_to_android_framework_;
args.current_time = base::GetWallTimeS();
args.ignore_guardrails = ignore_guardrails_;
args.allow_user_build_tracing = trace_config_->allow_user_build_tracing();
args.unique_session_name = trace_config_->unique_session_name();
args.max_upload_bytes_override =
trace_config_->guardrail_overrides().max_upload_per_day_bytes();
if (!args.unique_session_name.empty())
base::MaybeSetThreadName("p-" + args.unique_session_name);
expected_duration_ms_ = trace_config_->duration_ms();
if (!expected_duration_ms_) {
uint32_t timeout_ms = trace_config_->trigger_config().trigger_timeout_ms();
uint32_t max_stop_delay_ms = 0;
for (const auto& trigger : trace_config_->trigger_config().triggers()) {
max_stop_delay_ms = std::max(max_stop_delay_ms, trigger.stop_delay_ms());
}
expected_duration_ms_ = timeout_ms + max_stop_delay_ms;
}
const auto& delay = trace_config_->cmd_trace_start_delay();
if (delay.has_min_delay_ms()) {
PERFETTO_DCHECK(delay.has_max_delay_ms());
std::random_device r;
std::minstd_rand minstd(r());
std::uniform_int_distribution<uint32_t> dist(delay.min_delay_ms(),
delay.max_delay_ms());
std::this_thread::sleep_for(std::chrono::milliseconds(dist(minstd)));
}
if (trace_config_->trigger_config().trigger_timeout_ms() == 0) {
LogUploadEvent(PerfettoStatsdAtom::kTraceBegin);
} else {
LogUploadEvent(PerfettoStatsdAtom::kBackgroundTraceBegin);
}
auto err_atom = ConvertRateLimiterResponseToAtom(limiter_->ShouldTrace(args));
if (err_atom) {
LogUploadEvent(err_atom.value());
return 1;
}
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
if (!background_ && !is_detach() && !upload_flag_ &&
triggers_to_activate_.empty() && !isatty(STDIN_FILENO) &&
!isatty(STDERR_FILENO)) {
fprintf(stderr,
"Warning: No PTY. CTRL+C won't gracefully stop the trace. If you "
"are running perfetto via adb shell, use the -tt arg (adb shell "
"-t perfetto ...) or consider using the helper script "
"tools/record_android_trace from the Perfetto repository.\n\n");
}
#endif
consumer_endpoint_ =
ConsumerIPCClient::Connect(GetConsumerSocket(), this, &task_runner_);
SetupCtrlCSignalHandler();
task_runner_.Run();
return limiter_->OnTraceDone(args, update_guardrail_state_, bytes_written_)
? 0
: 1;
}
void PerfettoCmd::OnConnect() {
connected_ = true;
LogUploadEvent(PerfettoStatsdAtom::kOnConnect);
if (background_wait_) {
consumer_endpoint_->ObserveEvents(
perfetto::ObservableEvents::TYPE_ALL_DATA_SOURCES_STARTED);
}
if (query_service_) {
consumer_endpoint_->QueryServiceState(
[this](bool success, const TracingServiceState& svc_state) {
PrintServiceState(success, svc_state);
fflush(stdout);
exit(success ? 0 : 1);
});
return;
}
if (bugreport_) {
consumer_endpoint_->SaveTraceForBugreport(
[](bool success, const std::string& msg) {
if (success) {
PERFETTO_ILOG("Trace saved into %s", msg.c_str());
exit(0);
}
PERFETTO_ELOG("%s", msg.c_str());
exit(1);
});
return;
}
if (is_attach()) {
consumer_endpoint_->Attach(attach_key_);
return;
}
if (clone_tsid_.has_value()) {
consumer_endpoint_->CloneSession(*clone_tsid_);
return;
}
if (expected_duration_ms_) {
PERFETTO_LOG("Connected to the Perfetto traced service, TTL: %ds",
(expected_duration_ms_ + 999) / 1000);
} else {
PERFETTO_LOG("Connected to the Perfetto traced service, starting tracing");
}
PERFETTO_DCHECK(trace_config_);
trace_config_->set_enable_extra_guardrails(
(save_to_incidentd_ || report_to_android_framework_) &&
!ignore_guardrails_);
// Set the statsd logging flag if we're uploading
base::ScopedFile optional_fd;
if (trace_config_->write_into_file() && trace_config_->output_path().empty())
optional_fd.reset(dup(fileno(*trace_out_stream_)));
consumer_endpoint_->EnableTracing(*trace_config_, std::move(optional_fd));
if (is_detach()) {
consumer_endpoint_->Detach(detach_key_); // Will invoke OnDetach() soon.
return;
}
// Failsafe mechanism to avoid waiting indefinitely if the service hangs.
// Note: when using prefer_suspend_clock_for_duration the actual duration
// might be < expected_duration_ms_ measured in in wall time. But this is fine
// because the resulting timeout will be conservative (it will be accurate
// if the device never suspends, and will be more lax if it does).
if (expected_duration_ms_) {
uint32_t trace_timeout = expected_duration_ms_ + 60000 +
trace_config_->flush_timeout_ms() +
trace_config_->data_source_stop_timeout_ms();
task_runner_.PostDelayedTask(std::bind(&PerfettoCmd::OnTimeout, this),
trace_timeout);
}
}
void PerfettoCmd::OnDisconnect() {
if (connected_) {
PERFETTO_LOG("Disconnected from the traced service");
} else {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
static const char kDocUrl[] =
"https://perfetto.dev/docs/quickstart/android-tracing";
#else
static const char kDocUrl[] =
"https://perfetto.dev/docs/quickstart/linux-tracing";
#endif
PERFETTO_LOG(
"Could not connect to the traced socket %s. Ensure traced is "
"running or use tracebox. See %s.",
GetConsumerSocket(), kDocUrl);
}
connected_ = false;
task_runner_.Quit();
}
void PerfettoCmd::OnTimeout() {
PERFETTO_ELOG("Timed out while waiting for trace from the service, aborting");
LogUploadEvent(PerfettoStatsdAtom::kOnTimeout);
task_runner_.Quit();
}
void PerfettoCmd::CheckTraceDataTimeout() {
if (trace_data_timeout_armed_) {
PERFETTO_ELOG("Timed out while waiting for OnTraceData, aborting");
FinalizeTraceAndExit();
}
trace_data_timeout_armed_ = true;
task_runner_.PostDelayedTask(
std::bind(&PerfettoCmd::CheckTraceDataTimeout, this),
kOnTraceDataTimeoutMs);
}
void PerfettoCmd::OnTraceData(std::vector<TracePacket> packets, bool has_more) {
trace_data_timeout_armed_ = false;
if (!packet_writer_->WritePackets(packets)) {
PERFETTO_ELOG("Failed to write packets");
FinalizeTraceAndExit();
}
if (!has_more)
FinalizeTraceAndExit(); // Reached end of trace.
}
void PerfettoCmd::OnTracingDisabled(const std::string& error) {
ReadbackTraceDataAndQuit(error);
}
void PerfettoCmd::ReadbackTraceDataAndQuit(const std::string& error) {
if (!error.empty()) {
// Some of these errors (e.g. unique session name already exists) are soft
// errors and likely to happen in nominal condition. As such they shouldn't
// be marked as "E" in the event log. Hence why LOG and not ELOG here.
PERFETTO_LOG("Service error: %s", error.c_str());
// Update guardrail state even if we failed. This is for two
// reasons:
// 1. Keeps compatibility with pre-stats code which used to
// ignore errors from the service and always update state.
// 2. We want to prevent failure storms and the guardrails help
// by preventing tracing too frequently with the same session.
update_guardrail_state_ = true;
task_runner_.Quit();
return;
}
// Make sure to only log this atom if |error| is empty; traced
// would have logged a terminal error atom corresponding to |error|
// and we don't want to log anything after that.
LogUploadEvent(PerfettoStatsdAtom::kOnTracingDisabled);
if (trace_config_->write_into_file()) {
// If write_into_file == true, at this point the passed file contains
// already all the packets.
return FinalizeTraceAndExit();
}
trace_data_timeout_armed_ = false;
CheckTraceDataTimeout();
// This will cause a bunch of OnTraceData callbacks. The last one will
// save the file and exit.
consumer_endpoint_->ReadBuffers();
}
void PerfettoCmd::FinalizeTraceAndExit() {
LogUploadEvent(PerfettoStatsdAtom::kFinalizeTraceAndExit);
packet_writer_.reset();
if (trace_out_stream_) {
fseek(*trace_out_stream_, 0, SEEK_END);
off_t sz = ftell(*trace_out_stream_);
if (sz > 0)
bytes_written_ = static_cast<size_t>(sz);
}
if (save_to_incidentd_) {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
SaveTraceIntoIncidentOrCrash();
#endif
} else if (report_to_android_framework_) {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
ReportTraceToAndroidFrameworkOrCrash();
#endif
} else {
trace_out_stream_.reset();
if (trace_config_->write_into_file()) {
// trace_out_path_ might be empty in the case of --attach.
PERFETTO_LOG("Trace written into the output file");
} else {
PERFETTO_LOG("Wrote %" PRIu64 " bytes into %s", bytes_written_,
trace_out_path_ == "-" ? "stdout" : trace_out_path_.c_str());
}
}
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
// When multiple traces are being recorded at the same time, this is used to
// correlate one trace with another.
ReportFinalizeTraceUuidToAtrace(base::Uuid(uuid_));
#endif
update_guardrail_state_ = true;
task_runner_.Quit();
}
bool PerfettoCmd::OpenOutputFile() {
base::ScopedFile fd;
if (trace_out_path_.empty()) {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
fd = CreateUnlinkedTmpFile();
#endif
} else if (trace_out_path_ == "-") {
fd.reset(dup(fileno(stdout)));
} else {
fd = base::OpenFile(trace_out_path_, O_RDWR | O_CREAT | O_TRUNC, 0600);
}
if (!fd) {
PERFETTO_PLOG(
"Failed to open %s. If you get permission denied in "
"/data/misc/perfetto-traces, the file might have been "
"created by another user, try deleting it first.",
trace_out_path_.c_str());
return false;
}
trace_out_stream_.reset(fdopen(fd.release(), "wb"));
PERFETTO_CHECK(trace_out_stream_);
return true;
}
void PerfettoCmd::SetupCtrlCSignalHandler() {
ctrl_c_handler_installed_ = true;
base::InstallCtrlCHandler([] {
if (!g_perfetto_cmd)
return;
g_perfetto_cmd->SignalCtrlC();
});
auto weak_this = weak_factory_.GetWeakPtr();
task_runner_.AddFileDescriptorWatch(ctrl_c_evt_.fd(), [weak_this] {
if (!weak_this)
return;
PERFETTO_LOG("SIGINT/SIGTERM received: disabling tracing.");
weak_this->ctrl_c_evt_.Clear();
weak_this->consumer_endpoint_->Flush(0, [weak_this](bool flush_success) {
if (!weak_this)
return;
if (!flush_success)
PERFETTO_ELOG("Final flush unsuccessful.");
weak_this->consumer_endpoint_->DisableTracing();
});
});
}
void PerfettoCmd::OnDetach(bool success) {
if (!success) {
PERFETTO_ELOG("Session detach failed");
exit(1);
}
exit(0);
}
void PerfettoCmd::OnAttach(bool success, const TraceConfig& trace_config) {
if (!success) {
if (!redetach_once_attached_) {
// Print an error message if attach fails, with the exception of the
// --is_detached case, where we want to silently return.
PERFETTO_ELOG("Session re-attach failed. Check service logs for details");
}
// Keep this exit code distinguishable from the general error code so
// --is_detached can tell the difference between a general error and the
// not-detached case.
exit(2);
}
if (redetach_once_attached_) {
consumer_endpoint_->Detach(attach_key_); // Will invoke OnDetach() soon.
return;
}
trace_config_.reset(new TraceConfig(trace_config));
PERFETTO_DCHECK(trace_config_->write_into_file());
if (stop_trace_once_attached_) {
auto weak_this = weak_factory_.GetWeakPtr();
consumer_endpoint_->Flush(0, [weak_this](bool flush_success) {
if (!weak_this)
return;
if (!flush_success)
PERFETTO_ELOG("Final flush unsuccessful.");
weak_this->consumer_endpoint_->DisableTracing();
});
}
}
void PerfettoCmd::OnTraceStats(bool /*success*/,
const TraceStats& /*trace_config*/) {
// TODO(eseckler): Support GetTraceStats().
}
void PerfettoCmd::OnSessionCloned(bool success, const std::string& error) {
PERFETTO_DLOG("Cloned tracing session %" PRIu64 ", success=%d",
clone_tsid_.value_or(0), success);
std::string full_error;
if (!success) {
full_error = "Failed to clone tracing session " +
std::to_string(clone_tsid_.value_or(0)) + ": " + error;
}
// Kick off the readback and file finalization (as if we started tracing and
// reached the duration_ms timeout).
ReadbackTraceDataAndQuit(full_error);
}
void PerfettoCmd::PrintServiceState(bool success,
const TracingServiceState& svc_state) {
if (!success) {
PERFETTO_ELOG("Failed to query the service state");
return;
}
if (query_service_output_raw_) {
std::string str = svc_state.SerializeAsString();
fwrite(str.data(), 1, str.size(), stdout);
return;
}
printf(
"\x1b[31mNot meant for machine consumption. Use --query-raw for "
"scripts.\x1b[0m\n\n");
printf(
"Service: %s\n"
"Tracing sessions: %d (started: %d)\n",
svc_state.tracing_service_version().c_str(), svc_state.num_sessions(),
svc_state.num_sessions_started());
printf(R"(
PRODUCER PROCESSES CONNECTED:
ID PID UID NAME SDK
== === === ==== ===
)");
for (const auto& producer : svc_state.producers()) {
printf("%-10d %-10d %-10d %-32s %s\n", producer.id(), producer.pid(),
producer.uid(), producer.name().c_str(),
producer.sdk_version().c_str());
}
printf(R"(
DATA SOURCES REGISTERED:
NAME PRODUCER DETAILS
=== ======== ========
)");
for (const auto& ds : svc_state.data_sources()) {
char producer_id_and_name[128]{};
const int ds_producer_id = ds.producer_id();
for (const auto& producer : svc_state.producers()) {
if (producer.id() == ds_producer_id) {
base::SprintfTrunc(producer_id_and_name, sizeof(producer_id_and_name),
"%s (%d)", producer.name().c_str(), ds_producer_id);
break;
}
}
printf("%-40s %-40s ", ds.ds_descriptor().name().c_str(),
producer_id_and_name);
// Print the category names for clients using the track event SDK.
if (!ds.ds_descriptor().track_event_descriptor_raw().empty()) {
const std::string& raw = ds.ds_descriptor().track_event_descriptor_raw();
protos::gen::TrackEventDescriptor desc;
if (desc.ParseFromArray(raw.data(), raw.size())) {
for (const auto& cat : desc.available_categories()) {
printf("%s,", cat.name().c_str());
}
}
} else if (!ds.ds_descriptor().ftrace_descriptor_raw().empty()) {
const std::string& raw = ds.ds_descriptor().ftrace_descriptor_raw();
protos::gen::FtraceDescriptor desc;
if (desc.ParseFromArray(raw.data(), raw.size())) {
for (const auto& cat : desc.atrace_categories()) {
printf("%s,", cat.name().c_str());
}
}
}
printf("\n");
} // for data_sources()
if (svc_state.supports_tracing_sessions()) {
printf(R"(
TRACING SESSIONS:
ID UID STATE BUF (#) KB DUR (s) #DS STARTED NAME
=== === ===== ========== ======= === ======= ====
)");
for (const auto& sess : svc_state.tracing_sessions()) {
uint32_t buf_tot_kb = 0;
for (uint32_t kb : sess.buffer_size_kb())
buf_tot_kb += kb;
int sec =
static_cast<int>((sess.start_realtime_ns() / 1000000000) % 86400);
int h = sec / 3600;
int m = (sec - (h * 3600)) / 60;
int s = (sec - h * 3600 - m * 60);
printf("%-7" PRIu64 " %-7d %-10s (%d) %-8u %-9u %-4u %02d:%02d:%02d %s\n",
sess.id(), sess.consumer_uid(), sess.state().c_str(),
sess.buffer_size_kb_size(), buf_tot_kb, sess.duration_ms() / 1000,
sess.num_data_sources(), h, m, s,
sess.unique_session_name().c_str());
} // for tracing_sessions()
int sessions_listed = static_cast<int>(svc_state.tracing_sessions().size());
if (sessions_listed != svc_state.num_sessions() &&
base::GetCurrentUserId() != 0) {
printf(
"\n"
"NOTE: Some tracing sessions are not reported in the list above.\n"
"This is likely because they are owned by a different UID.\n"
"If you want to list all session, run again this command as root.\n");
}
} // if (supports_tracing_sessions)
}
void PerfettoCmd::OnObservableEvents(
const ObservableEvents& observable_events) {
if (observable_events.all_data_sources_started()) {
NotifyBgProcessPipe(kBackgroundOk);
}
}
void PerfettoCmd::LogUploadEvent(PerfettoStatsdAtom atom) {
if (!statsd_logging_)
return;
base::Uuid uuid(uuid_);
android_stats::MaybeLogUploadEvent(atom, uuid.lsb(), uuid.msb());
}
void PerfettoCmd::LogTriggerEvents(
PerfettoTriggerAtom atom,
const std::vector<std::string>& trigger_names) {
if (!statsd_logging_)
return;
android_stats::MaybeLogTriggerEvents(atom, trigger_names);
}
int PERFETTO_EXPORT_ENTRYPOINT PerfettoCmdMain(int argc, char** argv) {
perfetto::PerfettoCmd cmd;
auto opt_res = cmd.ParseCmdlineAndMaybeDaemonize(argc, argv);
if (opt_res.has_value())
return *opt_res;
return cmd.ConnectToServiceRunAndMaybeNotify();
}
} // namespace perfetto