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android / platform / system / extras / refs/heads/main / . / simpleperf / cmd_record.cpp
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/*
* Copyright (C) 2015 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 <inttypes.h>
#include <libgen.h>
#include <signal.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <sys/utsname.h>
#include <time.h>
#include <unistd.h>
#include <filesystem>
#include <optional>
#include <set>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-parameter"
#include <llvm/Support/MemoryBuffer.h>
#pragma clang diagnostic pop
#if defined(__ANDROID__)
#include <android-base/properties.h>
#endif
#include <unwindstack/Error.h>
#include "BranchListFile.h"
#include "CallChainJoiner.h"
#include "ETMRecorder.h"
#include "IOEventLoop.h"
#include "JITDebugReader.h"
#include "MapRecordReader.h"
#include "OfflineUnwinder.h"
#include "ProbeEvents.h"
#include "RecordFilter.h"
#include "cmd_record_impl.h"
#include "command.h"
#include "environment.h"
#include "event_selection_set.h"
#include "event_type.h"
#include "kallsyms.h"
#include "read_apk.h"
#include "read_elf.h"
#include "read_symbol_map.h"
#include "record.h"
#include "record_file.h"
#include "thread_tree.h"
#include "tracing.h"
#include "utils.h"
#include "workload.h"
namespace simpleperf {
namespace {
using android::base::ParseUint;
using android::base::Realpath;
static std::string default_measured_event_type = "cpu-cycles";
static std::unordered_map<std::string, uint64_t> branch_sampling_type_map = {
{"u", PERF_SAMPLE_BRANCH_USER},
{"k", PERF_SAMPLE_BRANCH_KERNEL},
{"any", PERF_SAMPLE_BRANCH_ANY},
{"any_call", PERF_SAMPLE_BRANCH_ANY_CALL},
{"any_ret", PERF_SAMPLE_BRANCH_ANY_RETURN},
{"ind_call", PERF_SAMPLE_BRANCH_IND_CALL},
};
static std::unordered_map<std::string, int> clockid_map = {
{"realtime", CLOCK_REALTIME},
{"monotonic", CLOCK_MONOTONIC},
{"monotonic_raw", CLOCK_MONOTONIC_RAW},
{"boottime", CLOCK_BOOTTIME},
};
// The max size of records dumped by kernel is 65535, and dump stack size
// should be a multiply of 8, so MAX_DUMP_STACK_SIZE is 65528.
static constexpr uint32_t MAX_DUMP_STACK_SIZE = 65528;
// The max allowed pages in mapped buffer is decided by rlimit(RLIMIT_MEMLOCK).
// Here 1024 is a desired value for pages in mapped buffer. If mapped
// successfully, the buffer size = 1024 * 4K (page size) = 4M.
static constexpr size_t DESIRED_PAGES_IN_MAPPED_BUFFER = 1024;
// Cache size used by CallChainJoiner to cache call chains in memory.
static constexpr size_t DEFAULT_CALL_CHAIN_JOINER_CACHE_SIZE = 8 * kMegabyte;
static constexpr size_t kDefaultAuxBufferSize = 4 * kMegabyte;
// On Pixel 3, it takes about 1ms to enable ETM, and 16-40ms to disable ETM and copy 4M ETM data.
// So make default period to 100ms.
static constexpr double kDefaultEtmDataFlushPeriodInSec = 0.1;
struct TimeStat {
uint64_t prepare_recording_time = 0;
uint64_t start_recording_time = 0;
uint64_t stop_recording_time = 0;
uint64_t finish_recording_time = 0;
uint64_t post_process_time = 0;
};
std::optional<size_t> GetDefaultRecordBufferSize(bool system_wide_recording) {
// Currently, the record buffer size in user-space is set to match the kernel buffer size on a
// 8 core system. For system-wide recording, it is 8K pages * 4K page_size * 8 cores = 256MB.
// For non system-wide recording, it is 1K pages * 4K page_size * 8 cores = 64MB.
// But on devices with memory >= 4GB, we increase buffer size to 256MB. This reduces the chance
// of cutting samples, which can cause broken callchains.
static constexpr size_t kLowMemoryRecordBufferSize = 64 * kMegabyte;
static constexpr size_t kHighMemoryRecordBufferSize = 256 * kMegabyte;
static constexpr size_t kSystemWideRecordBufferSize = 256 * kMegabyte;
// Ideally we can use >= 4GB here. But the memory size shown in /proc/meminfo is like to be 3.x GB
// on a device with 4GB memory. So we have to use <= 3GB.
static constexpr uint64_t kLowMemoryLimit = 3 * kGigabyte;
if (system_wide_recording) {
return kSystemWideRecordBufferSize;
}
auto device_memory = GetMemorySize();
if (!device_memory.has_value()) {
return std::nullopt;
}
return device_memory.value() <= kLowMemoryLimit ? kLowMemoryRecordBufferSize
: kHighMemoryRecordBufferSize;
}
class RecordCommand : public Command {
public:
RecordCommand()
: Command(
"record", "record sampling info in perf.data",
// clang-format off
"Usage: simpleperf record [options] [--] [command [command-args]]\n"
" Gather sampling information of running [command]. And -a/-p/-t option\n"
" can be used to change target of sampling information.\n"
" The default options are: -e cpu-cycles -f 4000 -o perf.data.\n"
"Select monitored threads:\n"
"-a System-wide collection. Use with --exclude-perf to exclude samples for\n"
" simpleperf process.\n"
#if defined(__ANDROID__)
"--app package_name Profile the process of an Android application.\n"
" On non-rooted devices, the app must be debuggable,\n"
" because we use run-as to switch to the app's context.\n"
#endif
"-p pid_or_process_name_regex1,pid_or_process_name_regex2,...\n"
" Record events on existing processes. Processes are searched either by pid\n"
" or process name regex. Mutually exclusive with -a.\n"
"-t tid1,tid2,... Record events on existing threads. Mutually exclusive with -a.\n"
"\n"
"Select monitored event types:\n"
"-e event1[:modifier1],event2[:modifier2],...\n"
" Select a list of events to record. An event can be:\n"
" 1) an event name listed in `simpleperf list`;\n"
" 2) a raw PMU event in rN format. N is a hex number.\n"
" For example, r1b selects event number 0x1b.\n"
" 3) a kprobe event added by --kprobe option.\n"
" Modifiers can be added to define how the event should be\n"
" monitored. Possible modifiers are:\n"
" u - monitor user space events only\n"
" k - monitor kernel space events only\n"
"--group event1[:modifier],event2[:modifier2],...\n"
" Similar to -e option. But events specified in the same --group\n"
" option are monitored as a group, and scheduled in and out at the\n"
" same time.\n"
"--trace-offcpu Generate samples when threads are scheduled off cpu.\n"
" Similar to \"-c 1 -e sched:sched_switch\".\n"
"--kprobe kprobe_event1,kprobe_event2,...\n"
" Add kprobe events during recording. The kprobe_event format is in\n"
" Documentation/trace/kprobetrace.rst in the kernel. Examples:\n"
" 'p:myprobe do_sys_openat2 $arg2:string' - add event kprobes:myprobe\n"
" 'r:myretprobe do_sys_openat2 $retval:s64' - add event kprobes:myretprobe\n"
"--add-counter event1,event2,... Add additional event counts in record samples. For example,\n"
" we can use `-e cpu-cycles --add-counter instructions` to\n"
" get samples for cpu-cycles event, while having instructions\n"
" event count for each sample.\n"
"\n"
"Select monitoring options:\n"
"-f freq Set event sample frequency. It means recording at most [freq]\n"
" samples every second. For non-tracepoint events, the default\n"
" option is -f 4000. A -f/-c option affects all event types\n"
" following it until meeting another -f/-c option. For example,\n"
" for \"-f 1000 -e cpu-cycles -c 1 -e sched:sched_switch\", cpu-cycles\n"
" has sample freq 1000, sched:sched_switch event has sample period 1.\n"
"-c count Set event sample period. It means recording one sample when\n"
" [count] events happen. For tracepoint events, the default option\n"
" is -c 1.\n"
"--call-graph fp | dwarf[,<dump_stack_size>]\n"
" Enable call graph recording. Use frame pointer or dwarf debug\n"
" frame as the method to parse call graph in stack.\n"
" Default is no call graph. Default dump_stack_size with -g is 65528.\n"
"-g Same as '--call-graph dwarf'.\n"
"--clockid clock_id Generate timestamps of samples using selected clock.\n"
" Possible values are: realtime, monotonic,\n"
" monotonic_raw, boottime, perf. If supported, default\n"
" is monotonic, otherwise is perf.\n"
"--cpu cpu_item1,cpu_item2,... Monitor events on selected cpus. cpu_item can be a number like\n"
" 1, or a range like 0-3. A --cpu option affects all event types\n"
" following it until meeting another --cpu option.\n"
"--delay time_in_ms Wait time_in_ms milliseconds before recording samples.\n"
"--duration time_in_sec Monitor for time_in_sec seconds instead of running\n"
" [command]. Here time_in_sec may be any positive\n"
" floating point number.\n"
"-j branch_filter1,branch_filter2,...\n"
" Enable taken branch stack sampling. Each sample captures a series\n"
" of consecutive taken branches.\n"
" The following filters are defined:\n"
" any: any type of branch\n"
" any_call: any function call or system call\n"
" any_ret: any function return or system call return\n"
" ind_call: any indirect branch\n"
" u: only when the branch target is at the user level\n"
" k: only when the branch target is in the kernel\n"
" This option requires at least one branch type among any, any_call,\n"
" any_ret, ind_call.\n"
"-b Enable taken branch stack sampling. Same as '-j any'.\n"
"-m mmap_pages Set pages used in the kernel to cache sample data for each cpu.\n"
" It should be a power of 2. If not set, the max possible value <= 1024\n"
" will be used.\n"
"--user-buffer-size <buffer_size> Set buffer size in userspace to cache sample data.\n"
" By default, it is %s.\n"
"--no-inherit Don't record created child threads/processes.\n"
"--cpu-percent <percent> Set the max percent of cpu time used for recording.\n"
" percent is in range [1-100], default is 25.\n"
"\n"
"--tp-filter filter_string Set filter_string for the previous tracepoint event.\n"
" Format is in Documentation/trace/events.rst in the kernel.\n"
" An example: 'prev_comm != \"simpleperf\" && (prev_pid > 1)'.\n"
"\n"
"Dwarf unwinding options:\n"
"--post-unwind=(yes|no) If `--call-graph dwarf` option is used, then the user's\n"
" stack will be recorded in perf.data and unwound while\n"
" recording by default. Use --post-unwind=yes to switch\n"
" to unwind after recording.\n"
"--no-unwind If `--call-graph dwarf` option is used, then the user's stack\n"
" will be unwound by default. Use this option to disable the\n"
" unwinding of the user's stack.\n"
"--no-callchain-joiner If `--call-graph dwarf` option is used, then by default\n"
" callchain joiner is used to break the 64k stack limit\n"
" and build more complete call graphs. However, the built\n"
" call graphs may not be correct in all cases.\n"
"--callchain-joiner-min-matching-nodes count\n"
" When callchain joiner is used, set the matched nodes needed to join\n"
" callchains. The count should be >= 1. By default it is 1.\n"
"--no-cut-samples Simpleperf uses a record buffer to cache records received from the kernel.\n"
" When the available space in the buffer reaches low level, the stack data in\n"
" samples is truncated to 1KB. When the available space reaches critical level,\n"
" it drops all samples. This option makes simpleperf not truncate stack data\n"
" when the available space reaches low level.\n"
"--keep-failed-unwinding-result Keep reasons for failed unwinding cases\n"
"--keep-failed-unwinding-debug-info Keep debug info for failed unwinding cases\n"
"\n"
"Sample filter options:\n"
"--exclude-perf Exclude samples for simpleperf process.\n"
RECORD_FILTER_OPTION_HELP_MSG_FOR_RECORDING
"\n"
"Recording file options:\n"
"--no-dump-kernel-symbols Don't dump kernel symbols in perf.data. By default\n"
" kernel symbols will be dumped when needed.\n"
"--no-dump-symbols Don't dump symbols in perf.data. By default symbols are\n"
" dumped in perf.data, to support reporting in another\n"
" environment.\n"
"-o record_file_name Set record file name, default is perf.data.\n"
"--size-limit SIZE[K|M|G] Stop recording after SIZE bytes of records.\n"
" Default is unlimited.\n"
"--symfs <dir> Look for files with symbols relative to this directory.\n"
" This option is used to provide files with symbol table and\n"
" debug information, which are used for unwinding and dumping symbols.\n"
"--add-meta-info key=value Add extra meta info, which will be stored in the recording file.\n"
"\n"
"ETM recording options:\n"
"--addr-filter filter_str1,filter_str2,...\n"
" Provide address filters for cs-etm instruction tracing.\n"
" filter_str accepts below formats:\n"
" 'filter <addr-range>' -- trace instructions in a range\n"
" 'start <addr>' -- start tracing when ip is <addr>\n"
" 'stop <addr>' -- stop tracing when ip is <addr>\n"
" <addr-range> accepts below formats:\n"
" <file_path> -- code sections in a binary file\n"
" <vaddr_start>-<vaddr_end>@<file_path> -- part of a binary file\n"
" <kernel_addr_start>-<kernel_addr_end> -- part of kernel space\n"
" <addr> accepts below formats:\n"
" <vaddr>@<file_path> -- virtual addr in a binary file\n"
" <kernel_addr> -- a kernel address\n"
" Examples:\n"
" 'filter 0x456-0x480@/system/lib/libc.so'\n"
" 'start 0x456@/system/lib/libc.so,stop 0x480@/system/lib/libc.so'\n"
"--aux-buffer-size <buffer_size> Set aux buffer size, only used in cs-etm event type.\n"
" Need to be power of 2 and page size aligned.\n"
" Used memory size is (buffer_size * (cpu_count + 1).\n"
" Default is 4M.\n"
"--decode-etm Convert ETM data into branch lists while recording.\n"
"--binary binary_name Used with --decode-etm to only generate data for binaries\n"
" matching binary_name regex.\n"
"--record-timestamp Generate timestamp packets in ETM stream.\n"
"--record-cycles Generate cycle count packets in ETM stream.\n"
"--cycle-threshold <threshold> Set cycle count counter threshold for ETM cycle count packets.\n"
"\n"
"Other options:\n"
"--exit-with-parent Stop recording when the thread starting simpleperf dies.\n"
"--use-cmd-exit-code Exit with the same exit code as the monitored cmdline.\n"
"--start_profiling_fd fd_no After starting profiling, write \"STARTED\" to\n"
" <fd_no>, then close <fd_no>.\n"
"--stdio-controls-profiling Use stdin/stdout to pause/resume profiling.\n"
#if defined(__ANDROID__)
"--in-app We are already running in the app's context.\n"
"--tracepoint-events file_name Read tracepoint events from [file_name] instead of tracefs.\n"
#endif
#if 0
// Below options are only used internally and shouldn't be visible to the public.
"--out-fd <fd> Write perf.data to a file descriptor.\n"
"--stop-signal-fd <fd> Stop recording when fd is readable.\n"
#endif
// clang-format on
),
system_wide_collection_(false),
branch_sampling_(0),
fp_callchain_sampling_(false),
dwarf_callchain_sampling_(false),
dump_stack_size_in_dwarf_sampling_(MAX_DUMP_STACK_SIZE),
unwind_dwarf_callchain_(true),
post_unwind_(false),
child_inherit_(true),
duration_in_sec_(0),
can_dump_kernel_symbols_(true),
dump_symbols_(true),
event_selection_set_(false),
mmap_page_range_(std::make_pair(1, DESIRED_PAGES_IN_MAPPED_BUFFER)),
record_filename_("perf.data"),
sample_record_count_(0),
in_app_context_(false),
trace_offcpu_(false),
exclude_kernel_callchain_(false),
allow_callchain_joiner_(true),
callchain_joiner_min_matching_nodes_(1u),
last_record_timestamp_(0u),
record_filter_(thread_tree_) {
// If we run `adb shell simpleperf record xxx` and stop profiling by ctrl-c, adb closes
// sockets connecting simpleperf. After that, simpleperf will receive SIGPIPE when writing
// to stdout/stderr, which is a problem when we use '--app' option. So ignore SIGPIPE to
// finish properly.
signal(SIGPIPE, SIG_IGN);
}
std::string LongHelpString() const override;
void Run(const std::vector<std::string>& args, int* exit_code) override;
bool Run(const std::vector<std::string>& args) override {
int exit_code;
Run(args, &exit_code);
return exit_code == 0;
}
private:
bool ParseOptions(const std::vector<std::string>& args, std::vector<std::string>* non_option_args,
ProbeEvents& probe_events);
bool AdjustPerfEventLimit();
bool PrepareRecording(Workload* workload);
bool DoRecording(Workload* workload);
bool PostProcessRecording(const std::vector<std::string>& args);
// pre recording functions
bool TraceOffCpu();
bool SetEventSelectionFlags();
bool CreateAndInitRecordFile();
std::unique_ptr<RecordFileWriter> CreateRecordFile(const std::string& filename,
const EventAttrIds& attrs);
bool DumpKernelSymbol();
bool DumpTracingData();
bool DumpMaps();
bool DumpAuxTraceInfo();
// recording functions
bool ProcessRecord(Record* record);
bool ShouldOmitRecord(Record* record);
bool DumpMapsForRecord(Record* record);
bool SaveRecordForPostUnwinding(Record* record);
bool SaveRecordAfterUnwinding(Record* record);
bool SaveRecordWithoutUnwinding(Record* record);
bool ProcessJITDebugInfo(std::vector<JITDebugInfo> debug_info, bool sync_kernel_records);
bool ProcessControlCmd(IOEventLoop* loop);
void UpdateRecord(Record* record);
bool UnwindRecord(SampleRecord& r);
bool KeepFailedUnwindingResult(const SampleRecord& r, const std::vector<uint64_t>& ips,
const std::vector<uint64_t>& sps);
// post recording functions
std::unique_ptr<RecordFileReader> MoveRecordFile(const std::string& old_filename);
bool MergeMapRecords();
bool PostUnwindRecords();
bool JoinCallChains();
bool DumpAdditionalFeatures(const std::vector<std::string>& args);
bool DumpBuildIdFeature();
bool DumpFileFeature();
bool DumpMetaInfoFeature(bool kernel_symbols_available);
bool DumpDebugUnwindFeature(const std::unordered_set<Dso*>& dso_set);
void CollectHitFileInfo(const SampleRecord& r, std::unordered_set<Dso*>* dso_set);
bool DumpETMBranchListFeature();
bool system_wide_collection_;
uint64_t branch_sampling_;
bool fp_callchain_sampling_;
bool dwarf_callchain_sampling_;
uint32_t dump_stack_size_in_dwarf_sampling_;
bool unwind_dwarf_callchain_;
bool post_unwind_;
bool keep_failed_unwinding_result_ = false;
bool keep_failed_unwinding_debug_info_ = false;
std::unique_ptr<OfflineUnwinder> offline_unwinder_;
bool child_inherit_;
uint64_t delay_in_ms_ = 0;
double duration_in_sec_;
bool can_dump_kernel_symbols_;
bool dump_symbols_;
std::string clockid_;
EventSelectionSet event_selection_set_;
std::pair<size_t, size_t> mmap_page_range_;
std::optional<size_t> user_buffer_size_;
size_t aux_buffer_size_ = kDefaultAuxBufferSize;
ThreadTree thread_tree_;
std::string record_filename_;
android::base::unique_fd out_fd_;
std::unique_ptr<RecordFileWriter> record_file_writer_;
android::base::unique_fd stop_signal_fd_;
uint64_t sample_record_count_;
android::base::unique_fd start_profiling_fd_;
bool stdio_controls_profiling_ = false;
std::string app_package_name_;
bool in_app_context_;
bool trace_offcpu_;
bool exclude_kernel_callchain_;
uint64_t size_limit_in_bytes_ = 0;
uint64_t max_sample_freq_ = DEFAULT_SAMPLE_FREQ_FOR_NONTRACEPOINT_EVENT;
size_t cpu_time_max_percent_ = 25;
// For CallChainJoiner
bool allow_callchain_joiner_;
size_t callchain_joiner_min_matching_nodes_;
std::unique_ptr<CallChainJoiner> callchain_joiner_;
bool allow_truncating_samples_ = true;
std::unique_ptr<JITDebugReader> jit_debug_reader_;
uint64_t last_record_timestamp_; // used to insert Mmap2Records for JIT debug info
TimeStat time_stat_;
EventAttrWithId dumping_attr_id_;
// In system wide recording, record if we have dumped map info for a process.
std::unordered_set<pid_t> dumped_processes_;
bool exclude_perf_ = false;
RecordFilter record_filter_;
std::optional<MapRecordReader> map_record_reader_;
std::optional<MapRecordThread> map_record_thread_;
std::unordered_map<std::string, std::string> extra_meta_info_;
bool use_cmd_exit_code_ = false;
std::vector<std::string> add_counters_;
std::unique_ptr<ETMBranchListGenerator> etm_branch_list_generator_;
std::unique_ptr<RegEx> binary_name_regex_;
};
std::string RecordCommand::LongHelpString() const {
uint64_t process_buffer_size = 0;
uint64_t system_wide_buffer_size = 0;
if (auto size = GetDefaultRecordBufferSize(false); size) {
process_buffer_size = size.value() / kMegabyte;
}
if (auto size = GetDefaultRecordBufferSize(true); size) {
system_wide_buffer_size = size.value() / kMegabyte;
}
std::string buffer_size_str;
if (process_buffer_size == system_wide_buffer_size) {
buffer_size_str = android::base::StringPrintf("%" PRIu64 "M", process_buffer_size);
} else {
buffer_size_str =
android::base::StringPrintf("%" PRIu64 "M for process recording and %" PRIu64
"M\n for system wide recording",
process_buffer_size, system_wide_buffer_size);
}
return android::base::StringPrintf(long_help_string_.c_str(), buffer_size_str.c_str());
}
void RecordCommand::Run(const std::vector<std::string>& args, int* exit_code) {
*exit_code = 1;
time_stat_.prepare_recording_time = GetSystemClock();
ScopedCurrentArch scoped_arch(GetMachineArch());
if (!CheckPerfEventLimit()) {
return;
}
AllowMoreOpenedFiles();
std::vector<std::string> workload_args;
ProbeEvents probe_events(event_selection_set_);
if (!ParseOptions(args, &workload_args, probe_events)) {
return;
}
if (!AdjustPerfEventLimit()) {
return;
}
std::unique_ptr<ScopedTempFiles> scoped_temp_files =
ScopedTempFiles::Create(android::base::Dirname(record_filename_));
if (!scoped_temp_files) {
PLOG(ERROR) << "Can't create output file in directory "
<< android::base::Dirname(record_filename_);
return;
}
if (!app_package_name_.empty() && !in_app_context_) {
// Some users want to profile non debuggable apps on rooted devices. If we use run-as,
// it will be impossible when using --app. So don't switch to app's context when we are
// root.
if (!IsRoot()) {
// Running simpleperf in app context doesn't allow running child command. So no need to
// consider exit code of child command here.
*exit_code = RunInAppContext(app_package_name_, "record", args, workload_args.size(),
record_filename_, true)
? 0
: 1;
return;
}
}
std::unique_ptr<Workload> workload;
if (!workload_args.empty()) {
workload = Workload::CreateWorkload(workload_args);
if (workload == nullptr) {
return;
}
}
if (!PrepareRecording(workload.get())) {
return;
}
time_stat_.start_recording_time = GetSystemClock();
if (!DoRecording(workload.get()) || !PostProcessRecording(args)) {
return;
}
if (use_cmd_exit_code_ && workload) {
workload->WaitChildProcess(false, exit_code);
} else {
*exit_code = 0;
}
}
bool RecordCommand::PrepareRecording(Workload* workload) {
// 1. Prepare in other modules.
PrepareVdsoFile();
// 2. Add default event type.
if (event_selection_set_.empty()) {
std::string event_type = default_measured_event_type;
if (GetTargetArch() == ARCH_X86_32 || GetTargetArch() == ARCH_X86_64 ||
GetTargetArch() == ARCH_RISCV64) {
// Emulators may not support hardware events. So switch to cpu-clock when cpu-cycles isn't
// available.
if (!IsHardwareEventSupported()) {
event_type = "cpu-clock";
LOG(INFO) << "Hardware events are not available, switch to cpu-clock.";
}
}
if (!event_selection_set_.AddEventType(event_type)) {
return false;
}
}
// 3. Process options before opening perf event files.
exclude_kernel_callchain_ = event_selection_set_.ExcludeKernel();
if (trace_offcpu_ && !TraceOffCpu()) {
return false;
}
if (!add_counters_.empty()) {
if (child_inherit_) {
LOG(ERROR) << "--no-inherit is needed when using --add-counter.";
return false;
}
if (!event_selection_set_.AddCounters(add_counters_)) {
return false;
}
}
if (!SetEventSelectionFlags()) {
return false;
}
if (unwind_dwarf_callchain_) {
bool collect_stat = keep_failed_unwinding_result_;
offline_unwinder_ = OfflineUnwinder::Create(collect_stat);
}
if (unwind_dwarf_callchain_ && allow_callchain_joiner_) {
callchain_joiner_.reset(new CallChainJoiner(DEFAULT_CALL_CHAIN_JOINER_CACHE_SIZE,
callchain_joiner_min_matching_nodes_, false));
}
// 4. Add monitored targets.
bool need_to_check_targets = false;
if (system_wide_collection_) {
event_selection_set_.AddMonitoredThreads({-1});
} else if (!event_selection_set_.HasMonitoredTarget()) {
if (workload != nullptr) {
event_selection_set_.AddMonitoredProcesses({workload->GetPid()});
event_selection_set_.SetEnableCondition(false, true);
} else if (!app_package_name_.empty()) {
// If app process is not created, wait for it. This allows simpleperf starts before
// app process. In this way, we can have a better support of app start-up time profiling.
std::set<pid_t> pids = WaitForAppProcesses(app_package_name_);
event_selection_set_.AddMonitoredProcesses(pids);
need_to_check_targets = true;
} else {
LOG(ERROR) << "No threads to monitor. Try `simpleperf help record` for help";
return false;
}
} else {
need_to_check_targets = true;
}
if (delay_in_ms_ != 0) {
event_selection_set_.SetEnableCondition(false, false);
}
// Profiling JITed/interpreted Java code is supported starting from Android P.
// Also support profiling art interpreter on host.
if (GetAndroidVersion() >= kAndroidVersionP || GetAndroidVersion() == 0) {
// JIT symfiles are stored in temporary files, and are deleted after recording. But if
// `-g --no-unwind` option is used, we want to keep symfiles to support unwinding in
// the debug-unwind cmd.
auto symfile_option = (dwarf_callchain_sampling_ && !unwind_dwarf_callchain_)
? JITDebugReader::SymFileOption::kKeepSymFiles
: JITDebugReader::SymFileOption::kDropSymFiles;
auto sync_option = (clockid_ == "monotonic") ? JITDebugReader::SyncOption::kSyncWithRecords
: JITDebugReader::SyncOption::kNoSync;
jit_debug_reader_.reset(new JITDebugReader(record_filename_, symfile_option, sync_option));
// To profile java code, need to dump maps containing vdex files, which are not executable.
event_selection_set_.SetRecordNotExecutableMaps(true);
}
// 5. Open perf event files and create mapped buffers.
if (!event_selection_set_.OpenEventFiles()) {
return false;
}
size_t record_buffer_size = 0;
if (user_buffer_size_.has_value()) {
record_buffer_size = user_buffer_size_.value();
} else {
auto default_size = GetDefaultRecordBufferSize(system_wide_collection_);
if (!default_size.has_value()) {
return false;
}
record_buffer_size = default_size.value();
}
if (!event_selection_set_.MmapEventFiles(mmap_page_range_.first, mmap_page_range_.second,
aux_buffer_size_, record_buffer_size,
allow_truncating_samples_, exclude_perf_)) {
return false;
}
auto callback = std::bind(&RecordCommand::ProcessRecord, this, std::placeholders::_1);
if (!event_selection_set_.PrepareToReadMmapEventData(callback)) {
return false;
}
// 6. Create perf.data.
if (!CreateAndInitRecordFile()) {
return false;
}
// 7. Add read/signal/periodic Events.
if (need_to_check_targets && !event_selection_set_.StopWhenNoMoreTargets()) {
return false;
}
IOEventLoop* loop = event_selection_set_.GetIOEventLoop();
auto exit_loop_callback = [loop]() { return loop->ExitLoop(); };
if (!loop->AddSignalEvents({SIGCHLD, SIGINT, SIGTERM}, exit_loop_callback, IOEventHighPriority)) {
return false;
}
// Only add an event for SIGHUP if we didn't inherit SIG_IGN (e.g. from nohup).
if (!SignalIsIgnored(SIGHUP)) {
if (!loop->AddSignalEvent(SIGHUP, exit_loop_callback, IOEventHighPriority)) {
return false;
}
}
if (stop_signal_fd_ != -1) {
if (!loop->AddReadEvent(stop_signal_fd_, exit_loop_callback, IOEventHighPriority)) {
return false;
}
}
if (delay_in_ms_ != 0) {
auto delay_callback = [this]() {
if (!event_selection_set_.SetEnableEvents(true)) {
return false;
}
if (!system_wide_collection_) {
// Dump maps in case there are new maps created while delaying.
return DumpMaps();
}
return true;
};
if (!loop->AddOneTimeEvent(SecondToTimeval(delay_in_ms_ / 1000), delay_callback)) {
return false;
}
}
if (duration_in_sec_ != 0) {
if (!loop->AddPeriodicEvent(
SecondToTimeval(duration_in_sec_), [loop]() { return loop->ExitLoop(); },
IOEventHighPriority)) {
return false;
}
}
if (stdio_controls_profiling_) {
if (!loop->AddReadEvent(0, [this, loop]() { return ProcessControlCmd(loop); })) {
return false;
}
}
if (jit_debug_reader_) {
auto callback = [this](std::vector<JITDebugInfo> debug_info, bool sync_kernel_records) {
return ProcessJITDebugInfo(std::move(debug_info), sync_kernel_records);
};
if (!jit_debug_reader_->RegisterDebugInfoCallback(loop, callback)) {
return false;
}
if (!system_wide_collection_) {
std::set<pid_t> pids = event_selection_set_.GetMonitoredProcesses();
for (pid_t tid : event_selection_set_.GetMonitoredThreads()) {
pid_t pid;
if (GetProcessForThread(tid, &pid)) {
pids.insert(pid);
}
}
for (pid_t pid : pids) {
if (!jit_debug_reader_->MonitorProcess(pid)) {
return false;
}
}
if (!jit_debug_reader_->ReadAllProcesses()) {
return false;
}
}
}
if (event_selection_set_.HasAuxTrace()) {
// ETM data is dumped to kernel buffer only when there is no thread traced by ETM. It happens
// either when all monitored threads are scheduled off cpu, or when all etm perf events are
// disabled.
// If ETM data isn't dumped to kernel buffer in time, overflow parts will be dropped. This
// makes less than expected data, especially in system wide recording. So add a periodic event
// to flush etm data by temporarily disable all perf events.
auto etm_flush = [this]() {
return event_selection_set_.SetEnableEvents(false) &&
event_selection_set_.SetEnableEvents(true);
};
if (!loop->AddPeriodicEvent(SecondToTimeval(kDefaultEtmDataFlushPeriodInSec), etm_flush)) {
return false;
}
if (etm_branch_list_generator_) {
if (exclude_perf_) {
etm_branch_list_generator_->SetExcludePid(getpid());
}
if (binary_name_regex_) {
etm_branch_list_generator_->SetBinaryFilter(binary_name_regex_.get());
}
}
}
return true;
}
bool RecordCommand::DoRecording(Workload* workload) {
// Write records in mapped buffers of perf_event_files to output file while workload is running.
if (workload != nullptr && !workload->IsStarted() && !workload->Start()) {
return false;
}
if (start_profiling_fd_.get() != -1) {
if (!android::base::WriteStringToFd("STARTED", start_profiling_fd_)) {
PLOG(ERROR) << "failed to write to start_profiling_fd_";
}
start_profiling_fd_.reset();
}
if (stdio_controls_profiling_) {
printf("started\n");
fflush(stdout);
}
if (!event_selection_set_.GetIOEventLoop()->RunLoop()) {
return false;
}
time_stat_.stop_recording_time = GetSystemClock();
if (!event_selection_set_.SyncKernelBuffer()) {
return false;
}
event_selection_set_.CloseEventFiles();
time_stat_.finish_recording_time = GetSystemClock();
uint64_t recording_time = time_stat_.finish_recording_time - time_stat_.start_recording_time;
LOG(INFO) << "Recorded for " << recording_time / 1e9 << " seconds. Start post processing.";
return true;
}
static bool WriteRecordDataToOutFd(const std::string& in_filename,
android::base::unique_fd out_fd) {
android::base::unique_fd in_fd(FileHelper::OpenReadOnly(in_filename));
if (in_fd == -1) {
PLOG(ERROR) << "Failed to open " << in_filename;
return false;
}
char buf[8192];
while (true) {
ssize_t n = TEMP_FAILURE_RETRY(read(in_fd, buf, sizeof(buf)));
if (n < 0) {
PLOG(ERROR) << "Failed to read " << in_filename;
return false;
}
if (n == 0) {
break;
}
if (!android::base::WriteFully(out_fd, buf, n)) {
PLOG(ERROR) << "Failed to write to out_fd";
return false;
}
}
unlink(in_filename.c_str());
return true;
}
bool RecordCommand::PostProcessRecording(const std::vector<std::string>& args) {
// 1. Read records left in the buffer.
if (!event_selection_set_.FinishReadMmapEventData()) {
return false;
}
// 2. Merge map records dumped while recording by map record thread.
if (map_record_thread_) {
if (!map_record_thread_->Join() || !MergeMapRecords()) {
return false;
}
}
// 3. Post unwind dwarf callchain.
if (unwind_dwarf_callchain_ && post_unwind_) {
if (!PostUnwindRecords()) {
return false;
}
}
// 4. Optionally join Callchains.
if (callchain_joiner_) {
JoinCallChains();
}
// 5. Dump additional features, and close record file.
if (!DumpAdditionalFeatures(args)) {
return false;
}
if (!record_file_writer_->Close()) {
return false;
}
if (out_fd_ != -1 && !WriteRecordDataToOutFd(record_filename_, std::move(out_fd_))) {
return false;
}
time_stat_.post_process_time = GetSystemClock();
// 6. Show brief record result.
auto record_stat = event_selection_set_.GetRecordStat();
if (event_selection_set_.HasAuxTrace()) {
LOG(INFO) << "Aux data traced: " << ReadableCount(record_stat.aux_data_size);
if (record_stat.lost_aux_data_size != 0) {
LOG(INFO) << "Aux data lost in user space: " << ReadableCount(record_stat.lost_aux_data_size)
<< ", consider increasing userspace buffer size(--user-buffer-size).";
}
} else {
// Here we report all lost records as samples. This isn't accurate. Because records like
// MmapRecords are not samples. But It's easier for users to understand.
size_t userspace_lost_samples =
record_stat.userspace_lost_samples + record_stat.userspace_lost_non_samples;
size_t lost_samples = record_stat.kernelspace_lost_records + userspace_lost_samples;
std::stringstream os;
os << "Samples recorded: " << ReadableCount(sample_record_count_);
if (record_stat.userspace_truncated_stack_samples > 0) {
os << " (" << ReadableCount(record_stat.userspace_truncated_stack_samples)
<< " with truncated stacks)";
}
os << ". Samples lost: " << ReadableCount(lost_samples);
if (lost_samples != 0) {
os << " (kernelspace: " << ReadableCount(record_stat.kernelspace_lost_records)
<< ", userspace: " << ReadableCount(userspace_lost_samples) << ")";
}
os << ".";
LOG(INFO) << os.str();
LOG(DEBUG) << "Record stat: kernelspace_lost_records="
<< ReadableCount(record_stat.kernelspace_lost_records)
<< ", userspace_lost_samples=" << ReadableCount(record_stat.userspace_lost_samples)
<< ", userspace_lost_non_samples="
<< ReadableCount(record_stat.userspace_lost_non_samples)
<< ", userspace_truncated_stack_samples="
<< ReadableCount(record_stat.userspace_truncated_stack_samples);
if (sample_record_count_ + record_stat.kernelspace_lost_records != 0) {
double kernelspace_lost_percent =
static_cast<double>(record_stat.kernelspace_lost_records) /
(record_stat.kernelspace_lost_records + sample_record_count_);
constexpr double KERNELSPACE_LOST_PERCENT_WARNING_BAR = 0.1;
if (kernelspace_lost_percent >= KERNELSPACE_LOST_PERCENT_WARNING_BAR) {
LOG(WARNING) << "Lost " << (kernelspace_lost_percent * 100)
<< "% of samples in kernel space, "
<< "consider increasing kernel buffer size(-m), "
<< "or decreasing sample frequency(-f), "
<< "or increasing sample period(-c).";
}
}
size_t userspace_lost_truncated_samples =
userspace_lost_samples + record_stat.userspace_truncated_stack_samples;
size_t userspace_complete_samples =
sample_record_count_ - record_stat.userspace_truncated_stack_samples;
if (userspace_complete_samples + userspace_lost_truncated_samples != 0) {
double userspace_lost_percent =
static_cast<double>(userspace_lost_truncated_samples) /
(userspace_complete_samples + userspace_lost_truncated_samples);
constexpr double USERSPACE_LOST_PERCENT_WARNING_BAR = 0.1;
if (userspace_lost_percent >= USERSPACE_LOST_PERCENT_WARNING_BAR) {
LOG(WARNING) << "Lost/Truncated " << (userspace_lost_percent * 100)
<< "% of samples in user space, "
<< "consider increasing userspace buffer size(--user-buffer-size), "
<< "or decreasing sample frequency(-f), "
<< "or increasing sample period(-c).";
}
}
if (callchain_joiner_) {
callchain_joiner_->DumpStat();
}
}
LOG(DEBUG) << "Prepare recording time "
<< (time_stat_.start_recording_time - time_stat_.prepare_recording_time) / 1e9
<< " s, recording time "
<< (time_stat_.stop_recording_time - time_stat_.start_recording_time) / 1e9
<< " s, stop recording time "
<< (time_stat_.finish_recording_time - time_stat_.stop_recording_time) / 1e9
<< " s, post process time "
<< (time_stat_.post_process_time - time_stat_.finish_recording_time) / 1e9 << " s.";
return true;
}
bool RecordCommand::ParseOptions(const std::vector<std::string>& args,
std::vector<std::string>* non_option_args,
ProbeEvents& probe_events) {
OptionValueMap options;
std::vector<std::pair<OptionName, OptionValue>> ordered_options;
if (!PreprocessOptions(args, GetRecordCmdOptionFormats(), &options, &ordered_options,
non_option_args)) {
return false;
}
// Process options.
system_wide_collection_ = options.PullBoolValue("-a");
if (auto value = options.PullValue("--add-counter"); value) {
add_counters_ = android::base::Split(*value->str_value, ",");
}
for (const OptionValue& value : options.PullValues("--add-meta-info")) {
const std::string& s = *value.str_value;
auto split_pos = s.find('=');
if (split_pos == std::string::npos || split_pos == 0 || split_pos + 1 == s.size()) {
LOG(ERROR) << "invalid meta-info: " << s;
return false;
}
extra_meta_info_[s.substr(0, split_pos)] = s.substr(split_pos + 1);
}
if (auto value = options.PullValue("--addr-filter"); value) {
auto filters = ParseAddrFilterOption(*value->str_value);
if (filters.empty()) {
return false;
}
event_selection_set_.SetAddrFilters(std::move(filters));
}
if (auto value = options.PullValue("--app"); value) {
app_package_name_ = *value->str_value;
}
if (auto value = options.PullValue("--aux-buffer-size"); value) {
uint64_t v = value->uint_value;
if (v > std::numeric_limits<size_t>::max() || !IsPowerOfTwo(v) || v % sysconf(_SC_PAGE_SIZE)) {
LOG(ERROR) << "invalid aux buffer size: " << v;
return false;
}
aux_buffer_size_ = static_cast<size_t>(v);
}
if (options.PullValue("-b")) {
branch_sampling_ = branch_sampling_type_map["any"];
}
if (auto value = options.PullValue("--binary"); value) {
binary_name_regex_ = RegEx::Create(*value->str_value);
if (binary_name_regex_ == nullptr) {
return false;
}
}
if (!options.PullUintValue("--callchain-joiner-min-matching-nodes",
&callchain_joiner_min_matching_nodes_, 1)) {
return false;
}
if (auto value = options.PullValue("--clockid"); value) {
clockid_ = *value->str_value;
if (clockid_ != "perf") {
if (!IsSettingClockIdSupported()) {
LOG(ERROR) << "Setting clockid is not supported by the kernel.";
return false;
}
if (clockid_map.find(clockid_) == clockid_map.end()) {
LOG(ERROR) << "Invalid clockid: " << clockid_;
return false;
}
}
}
if (!options.PullUintValue("--cpu-percent", &cpu_time_max_percent_, 1, 100)) {
return false;
}
if (options.PullBoolValue("--decode-etm")) {
etm_branch_list_generator_ = ETMBranchListGenerator::Create(system_wide_collection_);
}
if (options.PullBoolValue("--record-timestamp")) {
ETMRecorder& recorder = ETMRecorder::GetInstance();
recorder.SetRecordTimestamp(true);
}
if (options.PullBoolValue("--record-cycles")) {
ETMRecorder& recorder = ETMRecorder::GetInstance();
recorder.SetRecordCycles(true);
}
if (!options.PullUintValue("--delay", &delay_in_ms_)) {
return false;
}
size_t cyc_threshold;
if (options.PullUintValue("--cycle-threshold", &cyc_threshold)) {
ETMRecorder& recorder = ETMRecorder::GetInstance();
recorder.SetCycleThreshold(cyc_threshold);
}
if (!options.PullDoubleValue("--duration", &duration_in_sec_, 1e-9)) {
return false;
}
exclude_perf_ = options.PullBoolValue("--exclude-perf");
if (!record_filter_.ParseOptions(options)) {
return false;
}
if (options.PullValue("--exit-with-parent")) {
prctl(PR_SET_PDEATHSIG, SIGHUP, 0, 0, 0);
}
in_app_context_ = options.PullBoolValue("--in-app");
for (const OptionValue& value : options.PullValues("-j")) {
std::vector<std::string> branch_sampling_types = android::base::Split(*value.str_value, ",");
for (auto& type : branch_sampling_types) {
auto it = branch_sampling_type_map.find(type);
if (it == branch_sampling_type_map.end()) {
LOG(ERROR) << "unrecognized branch sampling filter: " << type;
return false;
}
branch_sampling_ |= it->second;
}
}
keep_failed_unwinding_result_ = options.PullBoolValue("--keep-failed-unwinding-result");
keep_failed_unwinding_debug_info_ = options.PullBoolValue("--keep-failed-unwinding-debug-info");
if (keep_failed_unwinding_debug_info_) {
keep_failed_unwinding_result_ = true;
}
for (const OptionValue& value : options.PullValues("--kprobe")) {
std::vector<std::string> cmds = android::base::Split(*value.str_value, ",");
for (const auto& cmd : cmds) {
if (!probe_events.AddKprobe(cmd)) {
return false;
}
}
}
if (auto value = options.PullValue("-m"); value) {
if (!IsPowerOfTwo(value->uint_value) ||
value->uint_value > std::numeric_limits<size_t>::max()) {
LOG(ERROR) << "Invalid mmap_pages: '" << value->uint_value << "'";
return false;
}
mmap_page_range_.first = mmap_page_range_.second = value->uint_value;
}
allow_callchain_joiner_ = !options.PullBoolValue("--no-callchain-joiner");
allow_truncating_samples_ = !options.PullBoolValue("--no-cut-samples");
can_dump_kernel_symbols_ = !options.PullBoolValue("--no-dump-kernel-symbols");
dump_symbols_ = !options.PullBoolValue("--no-dump-symbols");
if (auto value = options.PullValue("--no-inherit"); value) {
child_inherit_ = false;
} else if (system_wide_collection_) {
// child_inherit is used to monitor newly created threads. It isn't useful in system wide
// collection, which monitors all threads running on selected cpus.
child_inherit_ = false;
}
unwind_dwarf_callchain_ = !options.PullBoolValue("--no-unwind");
if (auto value = options.PullValue("-o"); value) {
record_filename_ = *value->str_value;
}
if (auto value = options.PullValue("--out-fd"); value) {
out_fd_.reset(static_cast<int>(value->uint_value));
}
if (auto strs = options.PullStringValues("-p"); !strs.empty()) {
if (auto pids = GetPidsFromStrings(strs, true, true); pids) {
event_selection_set_.AddMonitoredProcesses(pids.value());
} else {
return false;
}
}
// Use explicit if statements instead of logical operators to avoid short-circuit.
if (options.PullValue("--post-unwind")) {
post_unwind_ = true;
}
if (options.PullValue("--post-unwind=yes")) {
post_unwind_ = true;
}
if (options.PullValue("--post-unwind=no")) {
post_unwind_ = false;
}
if (auto value = options.PullValue("--user-buffer-size"); value) {
uint64_t v = value->uint_value;
if (v > std::numeric_limits<size_t>::max() || v == 0) {
LOG(ERROR) << "invalid user buffer size: " << v;
return false;
}
user_buffer_size_ = static_cast<size_t>(v);
}
if (!options.PullUintValue("--size-limit", &size_limit_in_bytes_, 1)) {
return false;
}
if (auto value = options.PullValue("--start_profiling_fd"); value) {
start_profiling_fd_.reset(static_cast<int>(value->uint_value));
}
stdio_controls_profiling_ = options.PullBoolValue("--stdio-controls-profiling");
if (auto value = options.PullValue("--stop-signal-fd"); value) {
stop_signal_fd_.reset(static_cast<int>(value->uint_value));
}
if (auto value = options.PullValue("--symfs"); value) {
if (!Dso::SetSymFsDir(*value->str_value)) {
return false;
}
}
for (const OptionValue& value : options.PullValues("-t")) {
if (auto tids = GetTidsFromString(*value.str_value, true); tids) {
event_selection_set_.AddMonitoredThreads(tids.value());
} else {
return false;
}
}
trace_offcpu_ = options.PullBoolValue("--trace-offcpu");
if (auto value = options.PullValue("--tracepoint-events"); value) {
if (!EventTypeManager::Instance().ReadTracepointsFromFile(*value->str_value)) {
return false;
}
}
use_cmd_exit_code_ = options.PullBoolValue("--use-cmd-exit-code");
CHECK(options.values.empty());
// Process ordered options.
for (const auto& pair : ordered_options) {
const OptionName& name = pair.first;
const OptionValue& value = pair.second;
if (name == "-c" || name == "-f") {
if (value.uint_value < 1) {
LOG(ERROR) << "invalid " << name << ": " << value.uint_value;
return false;
}
SampleRate rate;
if (name == "-c") {
rate.sample_period = value.uint_value;
} else {
if (value.uint_value >= INT_MAX) {
LOG(ERROR) << "sample freq can't be bigger than INT_MAX: " << value.uint_value;
return false;
}
rate.sample_freq = value.uint_value;
}
event_selection_set_.SetSampleRateForNewEvents(rate);
} else if (name == "--call-graph") {
std::vector<std::string> strs = android::base::Split(*value.str_value, ",");
if (strs[0] == "fp") {
fp_callchain_sampling_ = true;
dwarf_callchain_sampling_ = false;
} else if (strs[0] == "dwarf") {
fp_callchain_sampling_ = false;
dwarf_callchain_sampling_ = true;
if (strs.size() > 1) {
uint64_t size;
if (!ParseUint(strs[1], &size)) {
LOG(ERROR) << "invalid dump stack size in --call-graph option: " << strs[1];
return false;
}
if ((size & 7) != 0) {
LOG(ERROR) << "dump stack size " << size << " is not 8-byte aligned.";
return false;
}
if (size >= MAX_DUMP_STACK_SIZE) {
LOG(ERROR) << "dump stack size " << size << " is bigger than max allowed size "
<< MAX_DUMP_STACK_SIZE << ".";
return false;
}
dump_stack_size_in_dwarf_sampling_ = static_cast<uint32_t>(size);
}
}
} else if (name == "--cpu") {
if (auto cpus = GetCpusFromString(*value.str_value); cpus) {
event_selection_set_.SetCpusForNewEvents(
std::vector<int>(cpus.value().begin(), cpus.value().end()));
} else {
return false;
}
} else if (name == "-e") {
std::vector<std::string> event_types = android::base::Split(*value.str_value, ",");
for (auto& event_type : event_types) {
if (!probe_events.CreateProbeEventIfNotExist(event_type)) {
return false;
}
if (!event_selection_set_.AddEventType(event_type)) {
return false;
}
}
} else if (name == "-g") {
fp_callchain_sampling_ = false;
dwarf_callchain_sampling_ = true;
} else if (name == "--group") {
std::vector<std::string> event_types = android::base::Split(*value.str_value, ",");
for (const auto& event_type : event_types) {
if (!probe_events.CreateProbeEventIfNotExist(event_type)) {
return false;
}
}
if (!event_selection_set_.AddEventGroup(event_types)) {
return false;
}
} else if (name == "--tp-filter") {
if (!event_selection_set_.SetTracepointFilter(*value.str_value)) {
return false;
}
} else {
LOG(ERROR) << "unprocessed option: " << name;
return false;
}
}
if (!dwarf_callchain_sampling_) {
if (!unwind_dwarf_callchain_) {
LOG(ERROR) << "--no-unwind is only used with `--call-graph dwarf` option.";
return false;
}
unwind_dwarf_callchain_ = false;
}
if (post_unwind_) {
if (!dwarf_callchain_sampling_ || !unwind_dwarf_callchain_) {
post_unwind_ = false;
}
}
if (fp_callchain_sampling_) {
if (GetTargetArch() == ARCH_ARM) {
LOG(WARNING) << "`--callgraph fp` option doesn't work well on arm architecture, "
<< "consider using `-g` option or profiling on aarch64 architecture.";
}
}
if (system_wide_collection_ && event_selection_set_.HasMonitoredTarget()) {
LOG(ERROR) << "Record system wide and existing processes/threads can't be "
"used at the same time.";
return false;
}
if (system_wide_collection_ && !IsRoot()) {
LOG(ERROR) << "System wide profiling needs root privilege.";
return false;
}
if (dump_symbols_ && can_dump_kernel_symbols_) {
// No need to dump kernel symbols as we will dump all required symbols.
can_dump_kernel_symbols_ = false;
}
if (clockid_.empty()) {
clockid_ = IsSettingClockIdSupported() ? "monotonic" : "perf";
}
return true;
}
bool RecordCommand::AdjustPerfEventLimit() {
bool set_prop = false;
// 1. Adjust max_sample_rate.
uint64_t cur_max_freq;
if (GetMaxSampleFrequency(&cur_max_freq) && cur_max_freq < max_sample_freq_ &&
!SetMaxSampleFrequency(max_sample_freq_)) {
set_prop = true;
}
// 2. Adjust perf_cpu_time_max_percent.
size_t cur_percent;
if (GetCpuTimeMaxPercent(&cur_percent) && cur_percent != cpu_time_max_percent_ &&
!SetCpuTimeMaxPercent(cpu_time_max_percent_)) {
set_prop = true;
}
// 3. Adjust perf_event_mlock_kb.
long cpus = sysconf(_SC_NPROCESSORS_CONF);
uint64_t mlock_kb = cpus * (mmap_page_range_.second + 1) * 4;
if (event_selection_set_.HasAuxTrace()) {
mlock_kb += cpus * aux_buffer_size_ / 1024;
}
uint64_t cur_mlock_kb;
if (GetPerfEventMlockKb(&cur_mlock_kb) && cur_mlock_kb < mlock_kb &&
!SetPerfEventMlockKb(mlock_kb)) {
set_prop = true;
}
if (GetAndroidVersion() >= kAndroidVersionQ && set_prop && !in_app_context_) {
return SetPerfEventLimits(std::max(max_sample_freq_, cur_max_freq), cpu_time_max_percent_,
std::max(mlock_kb, cur_mlock_kb));
}
return true;
}
bool RecordCommand::TraceOffCpu() {
if (FindEventTypeByName("sched:sched_switch") == nullptr) {
LOG(ERROR) << "Can't trace off cpu because sched:sched_switch event is not available";
return false;
}
for (auto& event_type : event_selection_set_.GetTracepointEvents()) {
if (event_type->name == "sched:sched_switch") {
LOG(ERROR) << "Trace offcpu can't be used together with sched:sched_switch event";
return false;
}
}
if (!IsDumpingRegsForTracepointEventsSupported()) {
LOG(ERROR) << "Dumping regs for tracepoint events is not supported by the kernel";
return false;
}
// --trace-offcpu option only works with one of the selected event types.
std::set<std::string> accepted_events = {"cpu-clock", "task-clock"};
std::vector<const EventType*> events = event_selection_set_.GetEvents();
if (events.size() != 1 || accepted_events.find(events[0]->name) == accepted_events.end()) {
LOG(ERROR) << "--trace-offcpu option only works with one of events "
<< android::base::Join(accepted_events, ' ');
return false;
}
if (!event_selection_set_.AddEventType("sched:sched_switch", SampleRate(0, 1))) {
return false;
}
if (IsSwitchRecordSupported()) {
event_selection_set_.EnableSwitchRecord();
}
return true;
}
bool RecordCommand::SetEventSelectionFlags() {
event_selection_set_.SampleIdAll();
if (!event_selection_set_.SetBranchSampling(branch_sampling_)) {
return false;
}
if (fp_callchain_sampling_) {
event_selection_set_.EnableFpCallChainSampling();
} else if (dwarf_callchain_sampling_) {
if (!event_selection_set_.EnableDwarfCallChainSampling(dump_stack_size_in_dwarf_sampling_)) {
return false;
}
}
event_selection_set_.SetInherit(child_inherit_);
if (clockid_ != "perf") {
event_selection_set_.SetClockId(clockid_map[clockid_]);
}
return true;
}
bool RecordCommand::CreateAndInitRecordFile() {
EventAttrIds attrs = event_selection_set_.GetEventAttrWithId();
bool remove_regs_and_stacks = unwind_dwarf_callchain_ && !post_unwind_;
if (remove_regs_and_stacks) {
for (auto& attr : attrs) {
ReplaceRegAndStackWithCallChain(attr.attr);
}
}
record_file_writer_ = CreateRecordFile(record_filename_, attrs);
if (record_file_writer_ == nullptr) {
return false;
}
// Use first perf_event_attr and first event id to dump mmap and comm records.
CHECK(!attrs.empty());
dumping_attr_id_ = attrs[0];
CHECK(!dumping_attr_id_.ids.empty());
map_record_reader_.emplace(dumping_attr_id_.attr, dumping_attr_id_.ids[0],
event_selection_set_.RecordNotExecutableMaps());
map_record_reader_->SetCallback([this](Record* r) { return ProcessRecord(r); });
return DumpKernelSymbol() && DumpTracingData() && DumpMaps() && DumpAuxTraceInfo();
}
std::unique_ptr<RecordFileWriter> RecordCommand::CreateRecordFile(const std::string& filename,
const EventAttrIds& attrs) {
std::unique_ptr<RecordFileWriter> writer = RecordFileWriter::CreateInstance(filename);
if (writer != nullptr && writer->WriteAttrSection(attrs)) {
return writer;
}
return nullptr;
}
bool RecordCommand::DumpKernelSymbol() {
if (can_dump_kernel_symbols_) {
if (event_selection_set_.NeedKernelSymbol()) {
std::string kallsyms;
if (!LoadKernelSymbols(&kallsyms)) {
// Symbol loading may have failed due to the lack of permissions. This
// is not fatal, the symbols will appear as "unknown".
return true;
}
KernelSymbolRecord r(kallsyms);
if (!ProcessRecord(&r)) {
return false;
}
}
}
return true;
}
bool RecordCommand::DumpTracingData() {
std::vector<const EventType*> tracepoint_event_types = event_selection_set_.GetTracepointEvents();
if (tracepoint_event_types.empty() || !CanRecordRawData() || in_app_context_) {
return true; // No need to dump tracing data, or can't do it.
}
std::vector<char> tracing_data;
if (!GetTracingData(tracepoint_event_types, &tracing_data)) {
return false;
}
TracingDataRecord record(tracing_data);
if (!ProcessRecord(&record)) {
return false;
}
return true;
}
bool RecordCommand::DumpMaps() {
if (system_wide_collection_) {
// For system wide recording:
// If not aux tracing, only dump kernel maps. Maps of a process is dumped when needed (the
// first time a sample hits that process).
// If aux tracing with decoding etm data, the maps are dumped by etm_branch_list_generator.
// If aux tracing without decoding etm data, we don't know which maps will be needed, so dump
// all process maps. To reduce pre recording time, we dump process maps in map record thread
// while recording.
if (event_selection_set_.HasAuxTrace() && !etm_branch_list_generator_) {
map_record_thread_.emplace(*map_record_reader_);
return true;
}
if (!event_selection_set_.ExcludeKernel()) {
return map_record_reader_->ReadKernelMaps();
}
return true;
}
if (!event_selection_set_.ExcludeKernel() && !map_record_reader_->ReadKernelMaps()) {
return false;
}
// Map from process id to a set of thread ids in that process.
std::unordered_map<pid_t, std::unordered_set<pid_t>> process_map;
for (pid_t pid : event_selection_set_.GetMonitoredProcesses()) {
std::vector<pid_t> tids = GetThreadsInProcess(pid);
process_map[pid].insert(tids.begin(), tids.end());
}
for (pid_t tid : event_selection_set_.GetMonitoredThreads()) {
pid_t pid;
if (GetProcessForThread(tid, &pid)) {
process_map[pid].insert(tid);
}
}
// Dump each process.
for (const auto& [pid, tids] : process_map) {
if (!map_record_reader_->ReadProcessMaps(pid, tids, 0)) {
return false;
}
}
return true;
}
bool RecordCommand::ProcessRecord(Record* record) {
UpdateRecord(record);
if (ShouldOmitRecord(record)) {
return true;
}
if (size_limit_in_bytes_ > 0u) {
if (size_limit_in_bytes_ < record_file_writer_->GetDataSectionSize()) {
return event_selection_set_.GetIOEventLoop()->ExitLoop();
}
}
if (jit_debug_reader_ && !jit_debug_reader_->UpdateRecord(record)) {
return false;
}
last_record_timestamp_ = std::max(last_record_timestamp_, record->Timestamp());
// In system wide recording, maps are dumped when they are needed by records.
if (system_wide_collection_ && !DumpMapsForRecord(record)) {
return false;
}
// Record filter check should go after DumpMapsForRecord(). Otherwise, process/thread name
// filters don't work in system wide collection.
if (record->type() == PERF_RECORD_SAMPLE) {
if (!record_filter_.Check(static_cast<SampleRecord&>(*record))) {
return true;
}
}
if (etm_branch_list_generator_) {
bool consumed = false;
if (!etm_branch_list_generator_->ProcessRecord(*record, consumed)) {
return false;
}
if (consumed) {
return true;
}
}
if (unwind_dwarf_callchain_) {
if (post_unwind_) {
return SaveRecordForPostUnwinding(record);
}
return SaveRecordAfterUnwinding(record);
}
return SaveRecordWithoutUnwinding(record);
}
bool RecordCommand::DumpAuxTraceInfo() {
if (event_selection_set_.HasAuxTrace()) {
AuxTraceInfoRecord auxtrace_info = ETMRecorder::GetInstance().CreateAuxTraceInfoRecord();
return ProcessRecord(&auxtrace_info);
}
return true;
}
template <typename MmapRecordType>
bool MapOnlyExistInMemory(MmapRecordType* record) {
return !record->InKernel() && MappedFileOnlyExistInMemory(record->filename);
}
bool RecordCommand::ShouldOmitRecord(Record* record) {
if (jit_debug_reader_) {
// To profile jitted Java code, we need PROT_JIT_SYMFILE_MAP maps not overlapped by maps for
// [anon:dalvik-jit-code-cache]. To profile interpreted Java code, we record maps that
// are not executable. Some non-exec maps (like those for stack, heap) provide misleading map
// entries for unwinding, as in http://b/77236599. So it is better to remove
// dalvik-jit-code-cache and other maps that only exist in memory.
switch (record->type()) {
case PERF_RECORD_MMAP:
return MapOnlyExistInMemory(static_cast<MmapRecord*>(record));
case PERF_RECORD_MMAP2:
return MapOnlyExistInMemory(static_cast<Mmap2Record*>(record));
}
}
return false;
}
bool RecordCommand::DumpMapsForRecord(Record* record) {
if (record->type() == PERF_RECORD_SAMPLE) {
pid_t pid = static_cast<SampleRecord*>(record)->tid_data.pid;
if (dumped_processes_.find(pid) == dumped_processes_.end()) {
// Dump map info and all thread names for that process.
if (!map_record_reader_->ReadProcessMaps(pid, last_record_timestamp_)) {
return false;
}
dumped_processes_.insert(pid);
}
}
return true;
}
bool RecordCommand::SaveRecordForPostUnwinding(Record* record) {
if (!record_file_writer_->WriteRecord(*record)) {
LOG(ERROR) << "If there isn't enough space for storing profiling data, consider using "
<< "--no-post-unwind option.";
return false;
}
return true;
}
bool RecordCommand::SaveRecordAfterUnwinding(Record* record) {
if (record->type() == PERF_RECORD_SAMPLE) {
auto& r = *static_cast<SampleRecord*>(record);
// AdjustCallChainGeneratedByKernel() should go before UnwindRecord(). Because we don't want
// to adjust callchains generated by dwarf unwinder.
r.AdjustCallChainGeneratedByKernel();
if (!UnwindRecord(r)) {
return false;
}
// ExcludeKernelCallChain() should go after UnwindRecord() to notice the generated user call
// chain.
if (r.InKernel() && exclude_kernel_callchain_ && !r.ExcludeKernelCallChain()) {
// If current record contains no user callchain, skip it.
return true;
}
sample_record_count_++;
} else {
thread_tree_.Update(*record);
}
return record_file_writer_->WriteRecord(*record);
}
bool RecordCommand::SaveRecordWithoutUnwinding(Record* record) {
if (record->type() == PERF_RECORD_SAMPLE) {
auto& r = *static_cast<SampleRecord*>(record);
if (fp_callchain_sampling_ || dwarf_callchain_sampling_) {
r.AdjustCallChainGeneratedByKernel();
}
if (r.InKernel() && exclude_kernel_callchain_ && !r.ExcludeKernelCallChain()) {
// If current record contains no user callchain, skip it.
return true;
}
sample_record_count_++;
}
return record_file_writer_->WriteRecord(*record);
}
bool RecordCommand::ProcessJITDebugInfo(std::vector<JITDebugInfo> debug_info,
bool sync_kernel_records) {
for (auto& info : debug_info) {
if (info.type == JITDebugInfo::JIT_DEBUG_JIT_CODE) {
uint64_t timestamp =
jit_debug_reader_->SyncWithRecords() ? info.timestamp : last_record_timestamp_;
Mmap2Record record(dumping_attr_id_.attr, false, info.pid, info.pid, info.jit_code_addr,
info.jit_code_len, info.file_offset, map_flags::PROT_JIT_SYMFILE_MAP,
info.file_path, dumping_attr_id_.ids[0], timestamp);
if (!ProcessRecord(&record)) {
return false;
}
} else {
if (!info.symbols.empty()) {
Dso* dso = thread_tree_.FindUserDsoOrNew(info.file_path, 0, DSO_DEX_FILE);
dso->SetSymbols(&info.symbols);
}
if (info.dex_file_map) {
ThreadMmap& map = *info.dex_file_map;
uint64_t timestamp =
jit_debug_reader_->SyncWithRecords() ? info.timestamp : last_record_timestamp_;
Mmap2Record record(dumping_attr_id_.attr, false, info.pid, info.pid, map.start_addr,
map.len, map.pgoff, map.prot, map.name, dumping_attr_id_.ids[0],
timestamp);
if (!ProcessRecord(&record)) {
return false;
}
}
thread_tree_.AddDexFileOffset(info.file_path, info.dex_file_offset);
}
}
// We want to let samples see the most recent JIT maps generated before them, but no JIT maps
// generated after them. So process existing samples each time generating new JIT maps. We prefer
// to process samples after processing JIT maps. Because some of the samples may hit the new JIT
// maps, and we want to report them properly.
if (sync_kernel_records && !event_selection_set_.SyncKernelBuffer()) {
return false;
}
return true;
}
bool RecordCommand::ProcessControlCmd(IOEventLoop* loop) {
char* line = nullptr;
size_t line_length = 0;
if (getline(&line, &line_length, stdin) == -1) {
free(line);
// When the simpleperf Java API destroys the simpleperf process, it also closes the stdin pipe.
// So we may see EOF of stdin.
return loop->ExitLoop();
}
std::string cmd = android::base::Trim(line);
free(line);
LOG(DEBUG) << "process control cmd: " << cmd;
bool result = false;
if (cmd == "pause") {
result = event_selection_set_.SetEnableEvents(false);
} else if (cmd == "resume") {
result = event_selection_set_.SetEnableEvents(true);
} else {
LOG(ERROR) << "unknown control cmd: " << cmd;
}
printf("%s\n", result ? "ok" : "error");
fflush(stdout);
return result;
}
template <class RecordType>
void UpdateMmapRecordForEmbeddedPath(RecordType& r, bool has_prot, uint32_t prot) {
if (r.InKernel()) {
return;
}
std::string filename = r.filename;
bool name_changed = false;
// Some vdex files in map files are marked with deleted flag, but they exist in the file system.
// It may be because a new file is used to replace the old one, but still worth to try.
if (android::base::EndsWith(filename, " (deleted)")) {
filename.resize(filename.size() - 10);
name_changed = true;
}
if (r.data->pgoff != 0 && (!has_prot || (prot & PROT_EXEC))) {
// For the case of a shared library "foobar.so" embedded
// inside an APK, we rewrite the original MMAP from
// ["path.apk" offset=X] to ["path.apk!/foobar.so" offset=W]
// so as to make the library name explicit. This update is
// done here (as part of the record operation) as opposed to
// on the host during the report, since we want to report
// the correct library name even if the the APK in question
// is not present on the host. The new offset W is
// calculated to be with respect to the start of foobar.so,
// not to the start of path.apk.
EmbeddedElf* ee = ApkInspector::FindElfInApkByOffset(filename, r.data->pgoff);
if (ee != nullptr) {
// Compute new offset relative to start of elf in APK.
auto data = *r.data;
data.pgoff -= ee->entry_offset();
r.SetDataAndFilename(data, GetUrlInApk(filename, ee->entry_name()));
return;
}
}
std::string zip_path;
std::string entry_name;
if (ParseExtractedInMemoryPath(filename, &zip_path, &entry_name)) {
filename = GetUrlInApk(zip_path, entry_name);
name_changed = true;
}
if (name_changed) {
auto data = *r.data;
r.SetDataAndFilename(data, filename);
}
}
void RecordCommand::UpdateRecord(Record* record) {
if (record->type() == PERF_RECORD_MMAP) {
UpdateMmapRecordForEmbeddedPath(*static_cast<MmapRecord*>(record), false, 0);
} else if (record->type() == PERF_RECORD_MMAP2) {
auto r = static_cast<Mmap2Record*>(record);
UpdateMmapRecordForEmbeddedPath(*r, true, r->data->prot);
} else if (record->type() == PERF_RECORD_COMM) {
auto r = static_cast<CommRecord*>(record);
if (r->data->pid == r->data->tid) {
std::string s = GetCompleteProcessName(r->data->pid);
if (!s.empty()) {
r->SetCommandName(s);
}
}
}
}
bool RecordCommand::UnwindRecord(SampleRecord& r) {
if (!(r.sample_type & PERF_SAMPLE_CALLCHAIN) && (r.sample_type & PERF_SAMPLE_REGS_USER) &&
(r.regs_user_data.reg_mask != 0) && (r.sample_type & PERF_SAMPLE_STACK_USER)) {
return true;
}
if (r.GetValidStackSize() > 0) {
ThreadEntry* thread = thread_tree_.FindThreadOrNew(r.tid_data.pid, r.tid_data.tid);
RegSet regs(r.regs_user_data.abi, r.regs_user_data.reg_mask, r.regs_user_data.regs);
std::vector<uint64_t> ips;
std::vector<uint64_t> sps;
if (!offline_unwinder_->UnwindCallChain(*thread, regs, r.stack_user_data.data,
r.GetValidStackSize(), &ips, &sps)) {
return false;
}
// The unwinding may fail if JIT debug info isn't the latest. In this case, read JIT debug info
// from the process and retry unwinding.
if (jit_debug_reader_ && !post_unwind_ &&
offline_unwinder_->IsCallChainBrokenForIncompleteJITDebugInfo()) {
jit_debug_reader_->ReadProcess(r.tid_data.pid);
jit_debug_reader_->FlushDebugInfo(r.Timestamp());
if (!offline_unwinder_->UnwindCallChain(*thread, regs, r.stack_user_data.data,
r.GetValidStackSize(), &ips, &sps)) {
return false;
}
}
if (keep_failed_unwinding_result_ && !KeepFailedUnwindingResult(r, ips, sps)) {
return false;
}
r.ReplaceRegAndStackWithCallChain(ips);
if (callchain_joiner_ &&
!callchain_joiner_->AddCallChain(r.tid_data.pid, r.tid_data.tid,
CallChainJoiner::ORIGINAL_OFFLINE, ips, sps)) {
return false;
}
} else {
// For kernel samples, we still need to remove user stack and register fields.
r.ReplaceRegAndStackWithCallChain({});
}
return true;
}
bool RecordCommand::KeepFailedUnwindingResult(const SampleRecord& r,
const std::vector<uint64_t>& ips,
const std::vector<uint64_t>& sps) {
auto& result = offline_unwinder_->GetUnwindingResult();
if (result.error_code != unwindstack::ERROR_NONE) {
if (keep_failed_unwinding_debug_info_) {
return record_file_writer_->WriteRecord(UnwindingResultRecord(
r.time_data.time, result, r.regs_user_data, r.stack_user_data, ips, sps));
}
return record_file_writer_->WriteRecord(
UnwindingResultRecord(r.time_data.time, result, {}, {}, {}, {}));
}
return true;
}
std::unique_ptr<RecordFileReader> RecordCommand::MoveRecordFile(const std::string& old_filename) {
if (!record_file_writer_->Close()) {
return nullptr;
}
record_file_writer_.reset();
std::error_code ec;
std::filesystem::rename(record_filename_, old_filename, ec);
if (ec) {
LOG(DEBUG) << "Failed to rename: " << ec.message();
// rename() fails on Android N x86 emulator, which uses kernel 3.10. Because rename() in bionic
// uses renameat2 syscall, which isn't support on kernel < 3.15. So add a fallback to mv
// command. The mv command can also work with other situations when rename() doesn't work.
// So we'd like to keep it as a fallback to rename().
if (!Workload::RunCmd({"mv", record_filename_, old_filename})) {
return nullptr;
}
}
auto reader = RecordFileReader::CreateInstance(old_filename);
if (!reader) {
return nullptr;
}
record_file_writer_ = CreateRecordFile(record_filename_, reader->AttrSection());
if (!record_file_writer_) {
return nullptr;
}
return reader;
}
bool RecordCommand::MergeMapRecords() {
// 1. Move records from record_filename_ to a temporary file.
auto tmp_file = ScopedTempFiles::CreateTempFile();
auto reader = MoveRecordFile(tmp_file->path);
if (!reader) {
return false;
}
// 2. Copy map records from map record thread.
auto callback = [this](Record* r) {
UpdateRecord(r);
if (ShouldOmitRecord(r)) {
return true;
}
return record_file_writer_->WriteRecord(*r);
};
if (!map_record_thread_->ReadMapRecords(callback)) {
return false;
}
// 3. Copy data section from the old recording file.
std::vector<char> buf(64 * 1024);
uint64_t offset = reader->FileHeader().data.offset;
uint64_t left_size = reader->FileHeader().data.size;
while (left_size > 0) {
size_t nread = std::min<size_t>(left_size, buf.size());
if (!reader->ReadAtOffset(offset, buf.data(), nread) ||
!record_file_writer_->WriteData(buf.data(), nread)) {
return false;
}
offset += nread;
left_size -= nread;
}
return true;
}
bool RecordCommand::PostUnwindRecords() {
auto tmp_file = ScopedTempFiles::CreateTempFile();
auto reader = MoveRecordFile(tmp_file->path);
if (!reader) {
return false;
}
// Write new event attrs without regs and stacks fields.
EventAttrIds attrs = reader->AttrSection();
for (auto& attr : attrs) {
ReplaceRegAndStackWithCallChain(attr.attr);
}
if (!record_file_writer_->WriteAttrSection(attrs)) {
return false;
}
sample_record_count_ = 0;
auto callback = [this](std::unique_ptr<Record> record) {
return SaveRecordAfterUnwinding(record.get());
};
return reader->ReadDataSection(callback);
}
bool RecordCommand::JoinCallChains() {
// 1. Prepare joined callchains.
if (!callchain_joiner_->JoinCallChains()) {
return false;
}
// 2. Move records from record_filename_ to a temporary file.
auto tmp_file = ScopedTempFiles::CreateTempFile();
auto reader = MoveRecordFile(tmp_file->path);
if (!reader) {
return false;
}
// 3. Read records from the temporary file, and write record with joined call chains back
// to record_filename_.
auto record_callback = [&](std::unique_ptr<Record> r) {
if (r->type() != PERF_RECORD_SAMPLE) {
return record_file_writer_->WriteRecord(*r);
}
SampleRecord& sr = *static_cast<SampleRecord*>(r.get());
if (!sr.HasUserCallChain()) {
return record_file_writer_->WriteRecord(sr);
}
pid_t pid;
pid_t tid;
CallChainJoiner::ChainType type;
std::vector<uint64_t> ips;
std::vector<uint64_t> sps;
if (!callchain_joiner_->GetNextCallChain(pid, tid, type, ips, sps)) {
return false;
}
CHECK_EQ(type, CallChainJoiner::JOINED_OFFLINE);
CHECK_EQ(pid, static_cast<pid_t>(sr.tid_data.pid));
CHECK_EQ(tid, static_cast<pid_t>(sr.tid_data.tid));
sr.UpdateUserCallChain(ips);
return record_file_writer_->WriteRecord(sr);
};
return reader->ReadDataSection(record_callback);
}
static void LoadSymbolMapFile(int pid, const std::string& package, ThreadTree* thread_tree) {
// On Linux, symbol map files usually go to /tmp/perf-<pid>.map
// On Android, there is no directory where any process can create files.
// For now, use /data/local/tmp/perf-<pid>.map, which works for standalone programs,
// and /data/data/<package>/perf-<pid>.map, which works for apps.
auto path = package.empty()
? android::base::StringPrintf("/data/local/tmp/perf-%d.map", pid)
: android::base::StringPrintf("/data/data/%s/perf-%d.map", package.c_str(), pid);
auto symbols = ReadSymbolMapFromFile(path);
if (!symbols.empty()) {
thread_tree->AddSymbolsForProcess(pid, &symbols);
}
}
bool RecordCommand::DumpAdditionalFeatures(const std::vector<std::string>& args) {
// Read data section of perf.data to collect hit file information.
thread_tree_.ClearThreadAndMap();
bool kernel_symbols_available = false;
std::string kallsyms;
if (event_selection_set_.NeedKernelSymbol() && LoadKernelSymbols(&kallsyms)) {
Dso::SetKallsyms(kallsyms);
kernel_symbols_available = true;
}
std::unordered_set<int> loaded_symbol_maps;
std::vector<uint64_t> auxtrace_offset;
std::unordered_set<Dso*> debug_unwinding_files;
bool failed_unwinding_sample = false;
auto callback = [&](const Record* r) {
thread_tree_.Update(*r);
if (r->type() == PERF_RECORD_SAMPLE) {
auto sample = reinterpret_cast<const SampleRecord*>(r);
// Symbol map files are available after recording. Load one for the process.
if (loaded_symbol_maps.insert(sample->tid_data.pid).second) {
LoadSymbolMapFile(sample->tid_data.pid, app_package_name_, &thread_tree_);
}
if (failed_unwinding_sample) {
failed_unwinding_sample = false;
CollectHitFileInfo(*sample, &debug_unwinding_files);
} else {
CollectHitFileInfo(*sample, nullptr);
}
} else if (r->type() == PERF_RECORD_AUXTRACE) {
auto auxtrace = static_cast<const AuxTraceRecord*>(r);
auxtrace_offset.emplace_back(auxtrace->location.file_offset - auxtrace->size());
} else if (r->type() == SIMPLE_PERF_RECORD_UNWINDING_RESULT) {
failed_unwinding_sample = true;
}
};
if (!record_file_writer_->ReadDataSection(callback)) {
return false;
}
size_t feature_count = 6;
if (branch_sampling_) {
feature_count++;
}
if (!auxtrace_offset.empty()) {
feature_count++;
}
if (keep_failed_unwinding_debug_info_) {
feature_count += 2;
}
if (etm_branch_list_generator_) {
feature_count++;
}
if (!record_file_writer_->BeginWriteFeatures(feature_count)) {
return false;
}
if (!DumpBuildIdFeature()) {
return false;
}
if (!DumpFileFeature()) {
return false;
}
utsname uname_buf;
if (TEMP_FAILURE_RETRY(uname(&uname_buf)) != 0) {
PLOG(ERROR) << "uname() failed";
return false;
}
if (!record_file_writer_->WriteFeatureString(PerfFileFormat::FEAT_OSRELEASE, uname_buf.release)) {
return false;
}
if (!record_file_writer_->WriteFeatureString(PerfFileFormat::FEAT_ARCH, uname_buf.machine)) {
return false;
}
std::string exec_path = android::base::GetExecutablePath();
if (exec_path.empty()) exec_path = "simpleperf";
std::vector<std::string> cmdline;
cmdline.push_back(exec_path);
cmdline.push_back("record");
cmdline.insert(cmdline.end(), args.begin(), args.end());
if (!record_file_writer_->WriteCmdlineFeature(cmdline)) {
return false;
}
if (branch_sampling_ != 0 && !record_file_writer_->WriteBranchStackFeature()) {
return false;
}
if (!DumpMetaInfoFeature(kernel_symbols_available)) {
return false;
}
if (!auxtrace_offset.empty() && !record_file_writer_->WriteAuxTraceFeature(auxtrace_offset)) {
return false;
}
if (keep_failed_unwinding_debug_info_ && !DumpDebugUnwindFeature(debug_unwinding_files)) {
return false;
}
if (etm_branch_list_generator_ && !DumpETMBranchListFeature()) {
return false;
}
if (!record_file_writer_->EndWriteFeatures()) {
return false;
}
return true;
}
bool RecordCommand::DumpBuildIdFeature() {
std::vector<BuildIdRecord> build_id_records;
BuildId build_id;
std::vector<Dso*> dso_v = thread_tree_.GetAllDsos();
for (Dso* dso : dso_v) {
// For aux tracing, we don't know which binaries are traced.
// So dump build ids for all binaries.
if (!dso->HasDumpId() && !event_selection_set_.HasAuxTrace()) {
continue;
}
if (GetBuildId(*dso, build_id)) {
bool in_kernel = dso->type() == DSO_KERNEL || dso->type() == DSO_KERNEL_MODULE;
build_id_records.emplace_back(in_kernel, UINT_MAX, build_id, dso->Path());
}
}
if (!record_file_writer_->WriteBuildIdFeature(build_id_records)) {
return false;
}
return true;
}
bool RecordCommand::DumpFileFeature() {
std::vector<Dso*> dso_v = thread_tree_.GetAllDsos();
// To parse ETM data for kernel modules, we need to dump memory address for kernel modules.
if (event_selection_set_.HasAuxTrace() && !event_selection_set_.ExcludeKernel()) {
for (Dso* dso : dso_v) {
if (dso->type() == DSO_KERNEL_MODULE) {
dso->CreateDumpId();
}
}
}
return record_file_writer_->WriteFileFeatures(dso_v);
}
bool RecordCommand::DumpMetaInfoFeature(bool kernel_symbols_available) {
std::unordered_map<std::string, std::string> info_map = extra_meta_info_;
info_map["simpleperf_version"] = GetSimpleperfVersion();
info_map["system_wide_collection"] = system_wide_collection_ ? "true" : "false";
info_map["trace_offcpu"] = trace_offcpu_ ? "true" : "false";
// By storing event types information in perf.data, the readers of perf.data have the same
// understanding of event types, even if they are on another machine.
info_map["event_type_info"] = ScopedEventTypes::BuildString(event_selection_set_.GetEvents());
#if defined(__ANDROID__)
info_map["product_props"] = android::base::StringPrintf(
"%s:%s:%s", android::base::GetProperty("ro.product.manufacturer", "").c_str(),
android::base::GetProperty("ro.product.model", "").c_str(),
android::base::GetProperty("ro.product.name", "").c_str());
info_map["android_version"] = android::base::GetProperty("ro.build.version.release", "");
info_map["android_sdk_version"] = android::base::GetProperty("ro.build.version.sdk", "");
info_map["android_build_type"] = android::base::GetProperty("ro.build.type", "");
info_map["android_build_fingerprint"] = android::base::GetProperty("ro.build.fingerprint", "");
utsname un;
if (uname(&un) == 0) {
info_map["kernel_version"] = un.release;
}
if (!app_package_name_.empty()) {
info_map["app_package_name"] = app_package_name_;
if (IsRoot()) {
info_map["app_type"] = GetAppType(app_package_name_);
}
}
if (event_selection_set_.HasAuxTrace()) {
// used by --exclude-perf in cmd_inject.cpp
info_map["recording_process"] = std::to_string(getpid());
}
#endif
info_map["clockid"] = clockid_;
info_map["timestamp"] = std::to_string(time(nullptr));
info_map["kernel_symbols_available"] = kernel_symbols_available ? "true" : "false";
if (dwarf_callchain_sampling_ && !unwind_dwarf_callchain_) {
OfflineUnwinder::CollectMetaInfo(&info_map);
}
auto record_stat = event_selection_set_.GetRecordStat();
info_map["record_stat"] = android::base::StringPrintf(
"sample_record_count=%" PRIu64
",kernelspace_lost_records=%zu,userspace_lost_samples=%zu,"
"userspace_lost_non_samples=%zu,userspace_truncated_stack_samples=%zu",
sample_record_count_, record_stat.kernelspace_lost_records,
record_stat.userspace_lost_samples, record_stat.userspace_lost_non_samples,
record_stat.userspace_truncated_stack_samples);
return record_file_writer_->WriteMetaInfoFeature(info_map);
}
bool RecordCommand::DumpDebugUnwindFeature(const std::unordered_set<Dso*>& dso_set) {
DebugUnwindFeature debug_unwind_feature;
debug_unwind_feature.reserve(dso_set.size());
for (const Dso* dso : dso_set) {
if (dso->type() != DSO_ELF_FILE) {
continue;
}
const std::string& filename = dso->GetDebugFilePath();
std::unique_ptr<ElfFile> elf = ElfFile::Open(filename);
if (elf) {
llvm::MemoryBuffer* buffer = elf->GetMemoryBuffer();
debug_unwind_feature.resize(debug_unwind_feature.size() + 1);
auto& debug_unwind_file = debug_unwind_feature.back();
debug_unwind_file.path = filename;
debug_unwind_file.size = buffer->getBufferSize();
if (!record_file_writer_->WriteFeature(PerfFileFormat::FEAT_DEBUG_UNWIND_FILE,
buffer->getBufferStart(), buffer->getBufferSize())) {
return false;
}
} else {
LOG(WARNING) << "failed to keep " << filename << " in debug_unwind_feature section";
}
}
return record_file_writer_->WriteDebugUnwindFeature(debug_unwind_feature);
}
void RecordCommand::CollectHitFileInfo(const SampleRecord& r, std::unordered_set<Dso*>* dso_set) {
const ThreadEntry* thread = thread_tree_.FindThreadOrNew(r.tid_data.pid, r.tid_data.tid);
size_t kernel_ip_count;
std::vector<uint64_t> ips = r.GetCallChain(&kernel_ip_count);
if ((r.sample_type & PERF_SAMPLE_BRANCH_STACK) != 0) {
for (uint64_t i = 0; i < r.branch_stack_data.stack_nr; ++i) {
const auto& item = r.branch_stack_data.stack[i];
ips.push_back(item.from);
ips.push_back(item.to);
}
}
for (size_t i = 0; i < ips.size(); i++) {
const MapEntry* map = thread_tree_.FindMap(thread, ips[i], i < kernel_ip_count);
Dso* dso = map->dso;
if (dump_symbols_) {
const Symbol* symbol = thread_tree_.FindSymbol(map, ips[i], nullptr, &dso);
if (!symbol->HasDumpId()) {
dso->CreateSymbolDumpId(symbol);
}
}
if (!dso->HasDumpId() && dso->type() != DSO_UNKNOWN_FILE) {
dso->CreateDumpId();
}
if (dso_set != nullptr) {
dso_set->insert(dso);
}
}
}
bool RecordCommand::DumpETMBranchListFeature() {
ETMBinaryMap binary_map = etm_branch_list_generator_->GetETMBinaryMap();
std::string s;
if (!ETMBinaryMapToString(binary_map, s)) {
return false;
}
return record_file_writer_->WriteFeature(PerfFileFormat::FEAT_ETM_BRANCH_LIST, s.data(),
s.size());
}
} // namespace
static bool ConsumeStr(const char*& p, const char* s) {
if (strncmp(p, s, strlen(s)) == 0) {
p += strlen(s);
return true;
}
return false;
}
static bool ConsumeAddr(const char*& p, uint64_t* addr) {
errno = 0;
char* end;
*addr = strtoull(p, &end, 0);
if (errno == 0 && p != end) {
p = end;
return true;
}
return false;
}
// To reduce function length, not all format errors are checked.
static bool ParseOneAddrFilter(const std::string& s, std::vector<AddrFilter>* filters) {
std::vector<std::string> args = android::base::Split(s, " ");
if (args.size() != 2) {
return false;
}
uint64_t addr1;
uint64_t addr2;
uint64_t off1;
uint64_t off2;
std::string path;
if (auto p = s.data(); ConsumeStr(p, "start") && ConsumeAddr(p, &addr1)) {
if (*p == '\0') {
// start <kernel_addr>
filters->emplace_back(AddrFilter::KERNEL_START, addr1, 0, "");
return true;
}
if (ConsumeStr(p, "@") && *p != '\0') {
// start <vaddr>@<file_path>
if (auto elf = ElfFile::Open(p); elf && elf->VaddrToOff(addr1, &off1) && Realpath(p, &path)) {
filters->emplace_back(AddrFilter::FILE_START, off1, 0, path);
return true;
}
}
}
if (auto p = s.data(); ConsumeStr(p, "stop") && ConsumeAddr(p, &addr1)) {
if (*p == '\0') {
// stop <kernel_addr>
filters->emplace_back(AddrFilter::KERNEL_STOP, addr1, 0, "");
return true;
}
if (ConsumeStr(p, "@") && *p != '\0') {
// stop <vaddr>@<file_path>
if (auto elf = ElfFile::Open(p); elf && elf->VaddrToOff(addr1, &off1) && Realpath(p, &path)) {
filters->emplace_back(AddrFilter::FILE_STOP, off1, 0, path);
return true;
}
}
}
if (auto p = s.data(); ConsumeStr(p, "filter") && ConsumeAddr(p, &addr1) && ConsumeStr(p, "-") &&
ConsumeAddr(p, &addr2)) {
if (*p == '\0') {
// filter <kernel_addr_start>-<kernel_addr_end>
filters->emplace_back(AddrFilter::KERNEL_RANGE, addr1, addr2 - addr1, "");
return true;
}
if (ConsumeStr(p, "@") && *p != '\0') {
// filter <vaddr_start>-<vaddr_end>@<file_path>
if (auto elf = ElfFile::Open(p); elf && elf->VaddrToOff(addr1, &off1) &&
elf->VaddrToOff(addr2, &off2) && Realpath(p, &path)) {
filters->emplace_back(AddrFilter::FILE_RANGE, off1, off2 - off1, path);
return true;
}
}
}
if (auto p = s.data(); ConsumeStr(p, "filter") && *p != '\0') {
// filter <file_path>
path = android::base::Trim(p);
if (auto elf = ElfFile::Open(path); elf) {
for (const ElfSegment& seg : elf->GetProgramHeader()) {
if (seg.is_executable) {
filters->emplace_back(AddrFilter::FILE_RANGE, seg.file_offset, seg.file_size, path);
}
}
return true;
}
}
return false;
}
std::vector<AddrFilter> ParseAddrFilterOption(const std::string& s) {
std::vector<AddrFilter> filters;
for (const auto& str : android::base::Split(s, ",")) {
if (!ParseOneAddrFilter(str, &filters)) {
LOG(ERROR) << "failed to parse addr filter: " << str;
return {};
}
}
return filters;
}
void RegisterRecordCommand() {
RegisterCommand("record", [] { return std::unique_ptr<Command>(new RecordCommand()); });
}
} // namespace simpleperf