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llvm-project/bolt/lib/Profile/DataAggregator.cpp
Ádám Kallai f75973949b
[BOLT][AArch64] Add support for SPE brstack format (#129231) 
Since Linux 6.14, Perf gained the ability to report SPE branch events
using the `brstack` format, which matches the layout of LBR/BRBE.

This patch reuses the existing LBR parsing logic to support SPE.

Example SPE brstack format:
```bash
perf script -i perf.data -F pid,brstack --itrace=bl
```
```
  PID       FROM / TO / PREDICTED

16984  0x72e342e5f4/0x72e36192d0/M/-/-/11/RET/-
16984  0x72e7b8b3b4/0x72e7b8b3b8/PN/-/-/11/COND/-
16984  0x72e7b92b48/0x72e7b92b4c/PN/-/-/8/COND/-
16984  0x72eacc6b7c/0x760cc94b00/P/-/-/9/RET/-
16984  0x72e3f210fc/0x72e3f21068/P/-/-/4//-
16984  0x72e39b8c5c/0x72e3627b24/P/-/-/4//-
16984  0x72e7b89d20/0x72e7b92bbc/P/-/-/4/RET/-
```

SPE brstack flags can be two characters long: `PN` or `MN`:
- `P` = predicted branch
- `M` = mispredicted branch
- `N` = optionally appears when the branch is NOT-TAKEN
    - flag is relevant only to  conditional branches


Example of usage with BOLT:

1. Capture SPE branch events:
```bash
perf record -e 'arm_spe_0/branch_filter=1/u' -- binary
```

2. Convert profile for BOLT:
```bash
perf2bolt -p perf.data -o perf.fdata --spe binary
```

3. Run BOLT Optimization:
```bash
llvm-bolt binary -o binary.bolted --data   perf.fdata ...
```

A unit test verifies the parsing of the 'SPE brstack format'.

---------

Co-authored-by: Paschalis Mpeis <paschalis.mpeis@arm.com>
2025-06-20 10:40:35 +01:00

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//===- bolt/Profile/DataAggregator.cpp - Perf data aggregator -------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This family of functions reads profile data written by perf record,
// aggregate it and then write it back to an output file.
//
//===----------------------------------------------------------------------===//
#include "bolt/Profile/DataAggregator.h"
#include "bolt/Core/BinaryContext.h"
#include "bolt/Core/BinaryFunction.h"
#include "bolt/Passes/BinaryPasses.h"
#include "bolt/Profile/BoltAddressTranslation.h"
#include "bolt/Profile/Heatmap.h"
#include "bolt/Profile/YAMLProfileWriter.h"
#include "bolt/Utils/CommandLineOpts.h"
#include "bolt/Utils/Utils.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/Regex.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/raw_ostream.h"
#include <map>
#include <optional>
#include <unordered_map>
#include <utility>
#define DEBUG_TYPE "aggregator"
using namespace llvm;
using namespace bolt;
namespace opts {
static cl::opt<bool>
BasicAggregation("nl",
cl::desc("aggregate basic samples (without LBR info)"),
cl::cat(AggregatorCategory));
cl::opt<bool> ArmSPE("spe", cl::desc("Enable Arm SPE mode."),
cl::cat(AggregatorCategory));
static cl::opt<std::string>
ITraceAggregation("itrace",
cl::desc("Generate LBR info with perf itrace argument"),
cl::cat(AggregatorCategory));
static cl::opt<bool>
FilterMemProfile("filter-mem-profile",
cl::desc("if processing a memory profile, filter out stack or heap accesses "
"that won't be useful for BOLT to reduce profile file size"),
cl::init(true),
cl::cat(AggregatorCategory));
static cl::opt<bool> ParseMemProfile(
"parse-mem-profile",
cl::desc("enable memory profile parsing if it's present in the input data, "
"on by default unless `--itrace` is set."),
cl::init(true), cl::cat(AggregatorCategory));
static cl::opt<unsigned long long>
FilterPID("pid",
cl::desc("only use samples from process with specified PID"),
cl::init(0),
cl::Optional,
cl::cat(AggregatorCategory));
static cl::opt<bool>
IgnoreBuildID("ignore-build-id",
cl::desc("continue even if build-ids in input binary and perf.data mismatch"),
cl::init(false),
cl::cat(AggregatorCategory));
static cl::opt<bool> IgnoreInterruptLBR(
"ignore-interrupt-lbr",
cl::desc("ignore kernel interrupt LBR that happens asynchronously"),
cl::init(true), cl::cat(AggregatorCategory));
static cl::opt<unsigned long long>
MaxSamples("max-samples",
cl::init(-1ULL),
cl::desc("maximum number of samples to read from LBR profile"),
cl::Optional,
cl::Hidden,
cl::cat(AggregatorCategory));
extern cl::opt<opts::ProfileFormatKind> ProfileFormat;
extern cl::opt<bool> ProfileWritePseudoProbes;
extern cl::opt<std::string> SaveProfile;
cl::opt<bool> ReadPreAggregated(
"pa", cl::desc("skip perf and read data from a pre-aggregated file format"),
cl::cat(AggregatorCategory));
cl::opt<std::string>
ReadPerfEvents("perf-script-events",
cl::desc("skip perf event collection by supplying a "
"perf-script output in a textual format"),
cl::ReallyHidden, cl::init(""), cl::cat(AggregatorCategory));
static cl::opt<bool>
TimeAggregator("time-aggr",
cl::desc("time BOLT aggregator"),
cl::init(false),
cl::ZeroOrMore,
cl::cat(AggregatorCategory));
} // namespace opts
namespace {
const char TimerGroupName[] = "aggregator";
const char TimerGroupDesc[] = "Aggregator";
std::vector<SectionNameAndRange> getTextSections(const BinaryContext *BC) {
std::vector<SectionNameAndRange> sections;
for (BinarySection &Section : BC->sections()) {
if (!Section.isText())
continue;
if (Section.getSize() == 0)
continue;
sections.push_back(
{Section.getName(), Section.getAddress(), Section.getEndAddress()});
}
llvm::sort(sections,
[](const SectionNameAndRange &A, const SectionNameAndRange &B) {
return A.BeginAddress < B.BeginAddress;
});
return sections;
}
}
constexpr uint64_t DataAggregator::KernelBaseAddr;
DataAggregator::~DataAggregator() { deleteTempFiles(); }
namespace {
void deleteTempFile(const std::string &FileName) {
if (std::error_code Errc = sys::fs::remove(FileName.c_str()))
errs() << "PERF2BOLT: failed to delete temporary file " << FileName
<< " with error " << Errc.message() << "\n";
}
}
void DataAggregator::deleteTempFiles() {
for (std::string &FileName : TempFiles)
deleteTempFile(FileName);
TempFiles.clear();
}
void DataAggregator::findPerfExecutable() {
std::optional<std::string> PerfExecutable =
sys::Process::FindInEnvPath("PATH", "perf");
if (!PerfExecutable) {
outs() << "PERF2BOLT: No perf executable found!\n";
exit(1);
}
PerfPath = *PerfExecutable;
}
void DataAggregator::start() {
outs() << "PERF2BOLT: Starting data aggregation job for " << Filename << "\n";
// Turn on heatmap building if requested by --heatmap flag.
if (!opts::HeatmapMode && opts::HeatmapOutput.getNumOccurrences())
opts::HeatmapMode = opts::HeatmapModeKind::HM_Optional;
// Don't launch perf for pre-aggregated files or when perf input is specified
// by the user.
if (opts::ReadPreAggregated || !opts::ReadPerfEvents.empty())
return;
findPerfExecutable();
if (opts::ArmSPE) {
// pid from_ip to_ip flags
// where flags could be:
// P/M: whether branch was Predicted or Mispredicted.
// N: optionally appears when the branch was Not-Taken (ie fall-through)
// 12345 0x123/0x456/PN/-/-/8/RET/-
opts::ITraceAggregation = "bl";
opts::ParseMemProfile = true;
opts::BasicAggregation = false;
}
if (opts::BasicAggregation) {
launchPerfProcess("events without LBR", MainEventsPPI,
"script -F pid,event,ip",
/*Wait = */ false);
} else if (!opts::ITraceAggregation.empty()) {
// Disable parsing memory profile from trace data, unless requested by user.
if (!opts::ParseMemProfile.getNumOccurrences())
opts::ParseMemProfile = false;
std::string ItracePerfScriptArgs = llvm::formatv(
"script -F pid,brstack --itrace={0}", opts::ITraceAggregation);
launchPerfProcess("branch events with itrace", MainEventsPPI,
ItracePerfScriptArgs.c_str(),
/*Wait = */ false);
} else {
launchPerfProcess("branch events", MainEventsPPI, "script -F pid,brstack",
/*Wait = */ false);
}
if (opts::ParseMemProfile)
launchPerfProcess("mem events", MemEventsPPI, "script -F pid,event,addr,ip",
/*Wait = */ false);
launchPerfProcess("process events", MMapEventsPPI,
"script --show-mmap-events --no-itrace",
/*Wait = */ false);
launchPerfProcess("task events", TaskEventsPPI,
"script --show-task-events --no-itrace",
/*Wait = */ false);
}
void DataAggregator::abort() {
if (opts::ReadPreAggregated)
return;
std::string Error;
// Kill subprocesses in case they are not finished
sys::Wait(TaskEventsPPI.PI, 1, &Error);
sys::Wait(MMapEventsPPI.PI, 1, &Error);
sys::Wait(MainEventsPPI.PI, 1, &Error);
if (opts::ParseMemProfile)
sys::Wait(MemEventsPPI.PI, 1, &Error);
deleteTempFiles();
exit(1);
}
void DataAggregator::launchPerfProcess(StringRef Name, PerfProcessInfo &PPI,
const char *ArgsString, bool Wait) {
SmallVector<StringRef, 4> Argv;
outs() << "PERF2BOLT: spawning perf job to read " << Name << '\n';
Argv.push_back(PerfPath.data());
StringRef(ArgsString).split(Argv, ' ');
Argv.push_back("-f");
Argv.push_back("-i");
Argv.push_back(Filename.c_str());
if (std::error_code Errc =
sys::fs::createTemporaryFile("perf.script", "out", PPI.StdoutPath)) {
errs() << "PERF2BOLT: failed to create temporary file " << PPI.StdoutPath
<< " with error " << Errc.message() << "\n";
exit(1);
}
TempFiles.push_back(PPI.StdoutPath.data());
if (std::error_code Errc =
sys::fs::createTemporaryFile("perf.script", "err", PPI.StderrPath)) {
errs() << "PERF2BOLT: failed to create temporary file " << PPI.StderrPath
<< " with error " << Errc.message() << "\n";
exit(1);
}
TempFiles.push_back(PPI.StderrPath.data());
std::optional<StringRef> Redirects[] = {
std::nullopt, // Stdin
StringRef(PPI.StdoutPath.data()), // Stdout
StringRef(PPI.StderrPath.data())}; // Stderr
LLVM_DEBUG({
dbgs() << "Launching perf: ";
for (StringRef Arg : Argv)
dbgs() << Arg << " ";
dbgs() << " 1> " << PPI.StdoutPath.data() << " 2> " << PPI.StderrPath.data()
<< "\n";
});
if (Wait)
PPI.PI.ReturnCode = sys::ExecuteAndWait(PerfPath.data(), Argv,
/*envp*/ std::nullopt, Redirects);
else
PPI.PI = sys::ExecuteNoWait(PerfPath.data(), Argv, /*envp*/ std::nullopt,
Redirects);
}
void DataAggregator::processFileBuildID(StringRef FileBuildID) {
PerfProcessInfo BuildIDProcessInfo;
launchPerfProcess("buildid list",
BuildIDProcessInfo,
"buildid-list",
/*Wait = */true);
if (BuildIDProcessInfo.PI.ReturnCode != 0) {
ErrorOr<std::unique_ptr<MemoryBuffer>> MB =
MemoryBuffer::getFileOrSTDIN(BuildIDProcessInfo.StderrPath.data());
StringRef ErrBuf = (*MB)->getBuffer();
errs() << "PERF-ERROR: return code " << BuildIDProcessInfo.PI.ReturnCode
<< '\n';
errs() << ErrBuf;
return;
}
ErrorOr<std::unique_ptr<MemoryBuffer>> MB =
MemoryBuffer::getFileOrSTDIN(BuildIDProcessInfo.StdoutPath.data());
if (std::error_code EC = MB.getError()) {
errs() << "Cannot open " << BuildIDProcessInfo.StdoutPath.data() << ": "
<< EC.message() << "\n";
return;
}
FileBuf = std::move(*MB);
ParsingBuf = FileBuf->getBuffer();
std::optional<StringRef> FileName = getFileNameForBuildID(FileBuildID);
if (!FileName) {
if (hasAllBuildIDs()) {
errs() << "PERF2BOLT-ERROR: failed to match build-id from perf output. "
"This indicates the input binary supplied for data aggregation "
"is not the same recorded by perf when collecting profiling "
"data, or there were no samples recorded for the binary. "
"Use -ignore-build-id option to override.\n";
if (!opts::IgnoreBuildID)
abort();
} else {
errs() << "PERF2BOLT-WARNING: build-id will not be checked because perf "
"data was recorded without it\n";
return;
}
} else if (*FileName != llvm::sys::path::filename(BC->getFilename())) {
errs() << "PERF2BOLT-WARNING: build-id matched a different file name\n";
BuildIDBinaryName = std::string(*FileName);
} else {
outs() << "PERF2BOLT: matched build-id and file name\n";
}
}
bool DataAggregator::checkPerfDataMagic(StringRef FileName) {
if (opts::ReadPreAggregated)
return true;
Expected<sys::fs::file_t> FD = sys::fs::openNativeFileForRead(FileName);
if (!FD) {
consumeError(FD.takeError());
return false;
}
char Buf[7] = {0, 0, 0, 0, 0, 0, 0};
auto Close = make_scope_exit([&] { sys::fs::closeFile(*FD); });
Expected<size_t> BytesRead = sys::fs::readNativeFileSlice(
*FD, MutableArrayRef(Buf, sizeof(Buf)), 0);
if (!BytesRead) {
consumeError(BytesRead.takeError());
return false;
}
if (*BytesRead != 7)
return false;
if (strncmp(Buf, "PERFILE", 7) == 0)
return true;
return false;
}
void DataAggregator::parsePreAggregated() {
ErrorOr<std::unique_ptr<MemoryBuffer>> MB =
MemoryBuffer::getFileOrSTDIN(Filename);
if (std::error_code EC = MB.getError()) {
errs() << "PERF2BOLT-ERROR: cannot open " << Filename << ": "
<< EC.message() << "\n";
exit(1);
}
FileBuf = std::move(*MB);
ParsingBuf = FileBuf->getBuffer();
Col = 0;
Line = 1;
if (parsePreAggregatedLBRSamples()) {
errs() << "PERF2BOLT: failed to parse samples\n";
exit(1);
}
}
void DataAggregator::filterBinaryMMapInfo() {
if (opts::FilterPID) {
auto MMapInfoIter = BinaryMMapInfo.find(opts::FilterPID);
if (MMapInfoIter != BinaryMMapInfo.end()) {
MMapInfo MMap = MMapInfoIter->second;
BinaryMMapInfo.clear();
BinaryMMapInfo.insert(std::make_pair(MMap.PID, MMap));
} else {
if (errs().has_colors())
errs().changeColor(raw_ostream::RED);
errs() << "PERF2BOLT-ERROR: could not find a profile matching PID \""
<< opts::FilterPID << "\""
<< " for binary \"" << BC->getFilename() << "\".";
assert(!BinaryMMapInfo.empty() && "No memory map for matching binary");
errs() << " Profile for the following process is available:\n";
for (std::pair<const uint64_t, MMapInfo> &MMI : BinaryMMapInfo)
outs() << " " << MMI.second.PID
<< (MMI.second.Forked ? " (forked)\n" : "\n");
if (errs().has_colors())
errs().resetColor();
exit(1);
}
}
}
int DataAggregator::prepareToParse(StringRef Name, PerfProcessInfo &Process,
PerfProcessErrorCallbackTy Callback) {
if (!opts::ReadPerfEvents.empty()) {
outs() << "PERF2BOLT: using pre-processed perf events for '" << Name
<< "' (perf-script-events)\n";
ParsingBuf = opts::ReadPerfEvents;
return 0;
}
std::string Error;
outs() << "PERF2BOLT: waiting for perf " << Name
<< " collection to finish...\n";
sys::ProcessInfo PI = sys::Wait(Process.PI, std::nullopt, &Error);
if (!Error.empty()) {
errs() << "PERF-ERROR: " << PerfPath << ": " << Error << "\n";
deleteTempFiles();
exit(1);
}
if (PI.ReturnCode != 0) {
ErrorOr<std::unique_ptr<MemoryBuffer>> ErrorMB =
MemoryBuffer::getFileOrSTDIN(Process.StderrPath.data());
StringRef ErrBuf = (*ErrorMB)->getBuffer();
deleteTempFiles();
Callback(PI.ReturnCode, ErrBuf);
return PI.ReturnCode;
}
ErrorOr<std::unique_ptr<MemoryBuffer>> MB =
MemoryBuffer::getFileOrSTDIN(Process.StdoutPath.data());
if (std::error_code EC = MB.getError()) {
errs() << "Cannot open " << Process.StdoutPath.data() << ": "
<< EC.message() << "\n";
deleteTempFiles();
exit(1);
}
FileBuf = std::move(*MB);
ParsingBuf = FileBuf->getBuffer();
Col = 0;
Line = 1;
return PI.ReturnCode;
}
Error DataAggregator::preprocessProfile(BinaryContext &BC) {
this->BC = &BC;
auto ErrorCallback = [](int ReturnCode, StringRef ErrBuf) {
errs() << "PERF-ERROR: return code " << ReturnCode << "\n" << ErrBuf;
exit(1);
};
auto MemEventsErrorCallback = [&](int ReturnCode, StringRef ErrBuf) {
Regex NoData("Samples for '.*' event do not have ADDR attribute set. "
"Cannot print 'addr' field.");
if (!NoData.match(ErrBuf))
ErrorCallback(ReturnCode, ErrBuf);
};
if (opts::ReadPreAggregated) {
parsePreAggregated();
goto heatmap;
}
if (std::optional<StringRef> FileBuildID = BC.getFileBuildID()) {
outs() << "BOLT-INFO: binary build-id is: " << *FileBuildID << "\n";
processFileBuildID(*FileBuildID);
} else {
errs() << "BOLT-WARNING: build-id will not be checked because we could "
"not read one from input binary\n";
}
if (BC.IsLinuxKernel) {
// Current MMap parsing logic does not work with linux kernel.
// MMap entries for linux kernel uses PERF_RECORD_MMAP
// format instead of typical PERF_RECORD_MMAP2 format.
// Since linux kernel address mapping is absolute (same as
// in the ELF file), we avoid parsing MMap in linux kernel mode.
// While generating optimized linux kernel binary, we may need
// to parse MMap entries.
// In linux kernel mode, we analyze and optimize
// all linux kernel binary instructions, irrespective
// of whether they are due to system calls or due to
// interrupts. Therefore, we cannot ignore interrupt
// in Linux kernel mode.
opts::IgnoreInterruptLBR = false;
} else {
prepareToParse("mmap events", MMapEventsPPI, ErrorCallback);
if (parseMMapEvents())
errs() << "PERF2BOLT: failed to parse mmap events\n";
}
prepareToParse("task events", TaskEventsPPI, ErrorCallback);
if (parseTaskEvents())
errs() << "PERF2BOLT: failed to parse task events\n";
filterBinaryMMapInfo();
prepareToParse("events", MainEventsPPI, ErrorCallback);
if ((!opts::BasicAggregation && parseBranchEvents()) ||
(opts::BasicAggregation && parseBasicEvents()))
errs() << "PERF2BOLT: failed to parse samples\n";
// Special handling for memory events
if (opts::ParseMemProfile &&
!prepareToParse("mem events", MemEventsPPI, MemEventsErrorCallback))
if (const std::error_code EC = parseMemEvents())
errs() << "PERF2BOLT: failed to parse memory events: " << EC.message()
<< '\n';
deleteTempFiles();
heatmap:
// Sort parsed traces for faster processing.
if (!opts::BasicAggregation)
llvm::sort(Traces, llvm::less_first());
if (!opts::HeatmapMode)
return Error::success();
if (std::error_code EC = printLBRHeatMap())
return errorCodeToError(EC);
if (opts::HeatmapMode == opts::HeatmapModeKind::HM_Optional)
return Error::success();
assert(opts::HeatmapMode == opts::HeatmapModeKind::HM_Exclusive);
exit(0);
}
Error DataAggregator::readProfile(BinaryContext &BC) {
processProfile(BC);
for (auto &BFI : BC.getBinaryFunctions()) {
BinaryFunction &Function = BFI.second;
convertBranchData(Function);
}
if (opts::AggregateOnly) {
if (opts::ProfileFormat == opts::ProfileFormatKind::PF_Fdata)
if (std::error_code EC = writeAggregatedFile(opts::OutputFilename))
report_error("cannot create output data file", EC);
// BAT YAML is handled by DataAggregator since normal YAML output requires
// CFG which is not available in BAT mode.
if (usesBAT()) {
if (opts::ProfileFormat == opts::ProfileFormatKind::PF_YAML)
if (std::error_code EC = writeBATYAML(BC, opts::OutputFilename))
report_error("cannot create output data file", EC);
if (!opts::SaveProfile.empty())
if (std::error_code EC = writeBATYAML(BC, opts::SaveProfile))
report_error("cannot create output data file", EC);
}
}
return Error::success();
}
bool DataAggregator::mayHaveProfileData(const BinaryFunction &Function) {
return Function.hasProfileAvailable();
}
void DataAggregator::processProfile(BinaryContext &BC) {
if (opts::BasicAggregation)
processBasicEvents();
else
processBranchEvents();
processMemEvents();
// Mark all functions with registered events as having a valid profile.
for (auto &BFI : BC.getBinaryFunctions()) {
BinaryFunction &BF = BFI.second;
if (FuncBranchData *FBD = getBranchData(BF)) {
BF.markProfiled(BinaryFunction::PF_BRANCH);
BF.RawSampleCount = FBD->getNumExecutedBranches();
} else if (FuncBasicSampleData *FSD =
getFuncBasicSampleData(BF.getNames())) {
BF.markProfiled(BinaryFunction::PF_BASIC);
BF.RawSampleCount = FSD->getSamples();
}
}
for (auto &FuncBranches : NamesToBranches) {
llvm::stable_sort(FuncBranches.second.Data);
llvm::stable_sort(FuncBranches.second.EntryData);
}
for (auto &MemEvents : NamesToMemEvents)
llvm::stable_sort(MemEvents.second.Data);
// Release intermediate storage.
clear(Traces);
clear(BasicSamples);
clear(MemSamples);
}
BinaryFunction *
DataAggregator::getBinaryFunctionContainingAddress(uint64_t Address) const {
if (!BC->containsAddress(Address))
return nullptr;
return BC->getBinaryFunctionContainingAddress(Address, /*CheckPastEnd=*/false,
/*UseMaxSize=*/true);
}
BinaryFunction *
DataAggregator::getBATParentFunction(const BinaryFunction &Func) const {
if (BAT)
if (const uint64_t HotAddr = BAT->fetchParentAddress(Func.getAddress()))
return getBinaryFunctionContainingAddress(HotAddr);
return nullptr;
}
StringRef DataAggregator::getLocationName(const BinaryFunction &Func,
bool BAT) {
if (!BAT)
return Func.getOneName();
const BinaryFunction *OrigFunc = &Func;
// If it is a local function, prefer the name containing the file name where
// the local function was declared
for (StringRef AlternativeName : OrigFunc->getNames()) {
size_t FileNameIdx = AlternativeName.find('/');
// Confirm the alternative name has the pattern Symbol/FileName/1 before
// using it
if (FileNameIdx == StringRef::npos ||
AlternativeName.find('/', FileNameIdx + 1) == StringRef::npos)
continue;
return AlternativeName;
}
return OrigFunc->getOneName();
}
bool DataAggregator::doBasicSample(BinaryFunction &OrigFunc, uint64_t Address,
uint64_t Count) {
// To record executed bytes, use basic block size as is regardless of BAT.
uint64_t BlockSize = 0;
if (BinaryBasicBlock *BB = OrigFunc.getBasicBlockContainingOffset(
Address - OrigFunc.getAddress()))
BlockSize = BB->getOriginalSize();
BinaryFunction *ParentFunc = getBATParentFunction(OrigFunc);
BinaryFunction &Func = ParentFunc ? *ParentFunc : OrigFunc;
// Attach executed bytes to parent function in case of cold fragment.
Func.SampleCountInBytes += Count * BlockSize;
auto I = NamesToBasicSamples.find(Func.getOneName());
if (I == NamesToBasicSamples.end()) {
bool Success;
StringRef LocName = getLocationName(Func, BAT);
std::tie(I, Success) = NamesToBasicSamples.insert(std::make_pair(
Func.getOneName(),
FuncBasicSampleData(LocName, FuncBasicSampleData::ContainerTy())));
}
Address -= Func.getAddress();
if (BAT)
Address = BAT->translate(Func.getAddress(), Address, /*IsBranchSrc=*/false);
I->second.bumpCount(Address, Count);
return true;
}
bool DataAggregator::doIntraBranch(BinaryFunction &Func, uint64_t From,
uint64_t To, uint64_t Count,
uint64_t Mispreds) {
FuncBranchData *AggrData = getBranchData(Func);
if (!AggrData) {
AggrData = &NamesToBranches[Func.getOneName()];
AggrData->Name = getLocationName(Func, BAT);
setBranchData(Func, AggrData);
}
LLVM_DEBUG(dbgs() << "BOLT-DEBUG: bumpBranchCount: "
<< formatv("{0} @ {1:x} -> {0} @ {2:x}\n", Func, From, To));
AggrData->bumpBranchCount(From, To, Count, Mispreds);
return true;
}
bool DataAggregator::doInterBranch(BinaryFunction *FromFunc,
BinaryFunction *ToFunc, uint64_t From,
uint64_t To, uint64_t Count,
uint64_t Mispreds) {
FuncBranchData *FromAggrData = nullptr;
FuncBranchData *ToAggrData = nullptr;
StringRef SrcFunc;
StringRef DstFunc;
if (FromFunc) {
SrcFunc = getLocationName(*FromFunc, BAT);
FromAggrData = getBranchData(*FromFunc);
if (!FromAggrData) {
FromAggrData = &NamesToBranches[FromFunc->getOneName()];
FromAggrData->Name = SrcFunc;
setBranchData(*FromFunc, FromAggrData);
}
recordExit(*FromFunc, From, Mispreds, Count);
}
if (ToFunc) {
DstFunc = getLocationName(*ToFunc, BAT);
ToAggrData = getBranchData(*ToFunc);
if (!ToAggrData) {
ToAggrData = &NamesToBranches[ToFunc->getOneName()];
ToAggrData->Name = DstFunc;
setBranchData(*ToFunc, ToAggrData);
}
recordEntry(*ToFunc, To, Mispreds, Count);
}
if (FromAggrData)
FromAggrData->bumpCallCount(From, Location(!DstFunc.empty(), DstFunc, To),
Count, Mispreds);
if (ToAggrData)
ToAggrData->bumpEntryCount(Location(!SrcFunc.empty(), SrcFunc, From), To,
Count, Mispreds);
return true;
}
bool DataAggregator::checkReturn(uint64_t Addr) {
auto isReturn = [&](auto MI) { return MI && BC->MIB->isReturn(*MI); };
if (llvm::is_contained(Returns, Addr))
return true;
BinaryFunction *Func = getBinaryFunctionContainingAddress(Addr);
if (!Func)
return false;
const uint64_t Offset = Addr - Func->getAddress();
if (Func->hasInstructions()
? isReturn(Func->getInstructionAtOffset(Offset))
: isReturn(Func->disassembleInstructionAtOffset(Offset))) {
Returns.emplace(Addr);
return true;
}
return false;
}
bool DataAggregator::doBranch(uint64_t From, uint64_t To, uint64_t Count,
uint64_t Mispreds) {
// Mutates \p Addr to an offset into the containing function, performing BAT
// offset translation and parent lookup.
//
// Returns the containing function (or BAT parent).
auto handleAddress = [&](uint64_t &Addr, bool IsFrom) {
BinaryFunction *Func = getBinaryFunctionContainingAddress(Addr);
if (!Func) {
Addr = 0;
return Func;
}
Addr -= Func->getAddress();
if (BAT)
Addr = BAT->translate(Func->getAddress(), Addr, IsFrom);
if (BinaryFunction *ParentFunc = getBATParentFunction(*Func))
return ParentFunc;
return Func;
};
BinaryFunction *FromFunc = handleAddress(From, /*IsFrom*/ true);
BinaryFunction *ToFunc = handleAddress(To, /*IsFrom*/ false);
if (!FromFunc && !ToFunc)
return false;
// Treat recursive control transfers as inter-branches.
if (FromFunc == ToFunc && To != 0) {
recordBranch(*FromFunc, From, To, Count, Mispreds);
return doIntraBranch(*FromFunc, From, To, Count, Mispreds);
}
return doInterBranch(FromFunc, ToFunc, From, To, Count, Mispreds);
}
bool DataAggregator::doTrace(const Trace &Trace, uint64_t Count,
bool IsReturn) {
const uint64_t From = Trace.From, To = Trace.To;
BinaryFunction *FromFunc = getBinaryFunctionContainingAddress(From);
BinaryFunction *ToFunc = getBinaryFunctionContainingAddress(To);
NumTraces += Count;
if (!FromFunc || !ToFunc) {
LLVM_DEBUG(dbgs() << "Out of range trace " << Trace << '\n');
NumLongRangeTraces += Count;
return false;
}
if (FromFunc != ToFunc) {
LLVM_DEBUG(dbgs() << "Invalid trace " << Trace << '\n');
NumInvalidTraces += Count;
return false;
}
// Set ParentFunc to BAT parent function or FromFunc itself.
BinaryFunction *ParentFunc = getBATParentFunction(*FromFunc);
if (!ParentFunc)
ParentFunc = FromFunc;
ParentFunc->SampleCountInBytes += Count * (To - From);
const uint64_t FuncAddress = FromFunc->getAddress();
std::optional<BoltAddressTranslation::FallthroughListTy> FTs =
BAT && BAT->isBATFunction(FuncAddress)
? BAT->getFallthroughsInTrace(FuncAddress, From - IsReturn, To)
: getFallthroughsInTrace(*FromFunc, Trace, Count, IsReturn);
if (!FTs) {
LLVM_DEBUG(dbgs() << "Invalid trace " << Trace << '\n');
NumInvalidTraces += Count;
return false;
}
LLVM_DEBUG(dbgs() << "Processing " << FTs->size() << " fallthroughs for "
<< FromFunc->getPrintName() << ":" << Trace << '\n');
for (auto [From, To] : *FTs) {
if (BAT) {
From = BAT->translate(FromFunc->getAddress(), From, /*IsBranchSrc=*/true);
To = BAT->translate(FromFunc->getAddress(), To, /*IsBranchSrc=*/false);
}
doIntraBranch(*ParentFunc, From, To, Count, false);
}
return true;
}
std::optional<SmallVector<std::pair<uint64_t, uint64_t>, 16>>
DataAggregator::getFallthroughsInTrace(BinaryFunction &BF, const Trace &Trace,
uint64_t Count, bool IsReturn) const {
SmallVector<std::pair<uint64_t, uint64_t>, 16> Branches;
BinaryContext &BC = BF.getBinaryContext();
// Offsets of the trace within this function.
const uint64_t From = Trace.From - BF.getAddress();
const uint64_t To = Trace.To - BF.getAddress();
if (From > To)
return std::nullopt;
// Accept fall-throughs inside pseudo functions (PLT/thunks).
// This check has to be above BF.empty as pseudo functions would pass it:
// pseudo => ignored => CFG not built => empty.
// If we return nullopt, trace would be reported as mismatching disassembled
// function contents which it is not. To avoid this, return an empty
// fall-through list instead.
if (BF.isPseudo())
return Branches;
if (!BF.isSimple())
return std::nullopt;
assert(BF.hasCFG() && "can only record traces in CFG state");
const BinaryBasicBlock *FromBB = BF.getBasicBlockContainingOffset(From);
const BinaryBasicBlock *ToBB = BF.getBasicBlockContainingOffset(To);
if (!FromBB || !ToBB)
return std::nullopt;
// Adjust FromBB if the first LBR is a return from the last instruction in
// the previous block (that instruction should be a call).
if (IsReturn) {
if (From)
FromBB = BF.getBasicBlockContainingOffset(From - 1);
else
LLVM_DEBUG(dbgs() << "return to the function start: " << Trace << '\n');
} else if (Trace.Branch == Trace::EXTERNAL && From == FromBB->getOffset() &&
!FromBB->isEntryPoint() && !FromBB->isLandingPad()) {
const BinaryBasicBlock *PrevBB =
BF.getLayout().getBlock(FromBB->getIndex() - 1);
if (PrevBB->getSuccessor(FromBB->getLabel())) {
const MCInst *Instr = PrevBB->getLastNonPseudoInstr();
if (Instr && BC.MIB->isCall(*Instr))
FromBB = PrevBB;
else
LLVM_DEBUG(dbgs() << "invalid trace (no call): " << Trace << '\n');
} else {
LLVM_DEBUG(dbgs() << "invalid trace: " << Trace << '\n');
}
}
// Fill out information for fall-through edges. The From and To could be
// within the same basic block, e.g. when two call instructions are in the
// same block. In this case we skip the processing.
if (FromBB == ToBB)
return Branches;
// Process blocks in the original layout order.
BinaryBasicBlock *BB = BF.getLayout().getBlock(FromBB->getIndex());
assert(BB == FromBB && "index mismatch");
while (BB != ToBB) {
BinaryBasicBlock *NextBB = BF.getLayout().getBlock(BB->getIndex() + 1);
assert((NextBB && NextBB->getOffset() > BB->getOffset()) && "bad layout");
// Check for bad LBRs.
if (!BB->getSuccessor(NextBB->getLabel())) {
LLVM_DEBUG(dbgs() << "no fall-through for the trace: " << Trace << '\n');
return std::nullopt;
}
const MCInst *Instr = BB->getLastNonPseudoInstr();
uint64_t Offset = 0;
if (Instr)
Offset = BC.MIB->getOffsetWithDefault(*Instr, 0);
else
Offset = BB->getOffset();
Branches.emplace_back(Offset, NextBB->getOffset());
BB = NextBB;
}
// Record fall-through jumps
for (const auto &[FromOffset, ToOffset] : Branches) {
BinaryBasicBlock *FromBB = BF.getBasicBlockContainingOffset(FromOffset);
BinaryBasicBlock *ToBB = BF.getBasicBlockAtOffset(ToOffset);
assert(FromBB && ToBB);
BinaryBasicBlock::BinaryBranchInfo &BI = FromBB->getBranchInfo(*ToBB);
BI.Count += Count;
}
return Branches;
}
bool DataAggregator::recordEntry(BinaryFunction &BF, uint64_t To, bool Mispred,
uint64_t Count) const {
if (To > BF.getSize())
return false;
if (!BF.hasProfile())
BF.ExecutionCount = 0;
BinaryBasicBlock *EntryBB = nullptr;
if (To == 0) {
BF.ExecutionCount += Count;
if (!BF.empty())
EntryBB = &BF.front();
} else if (BinaryBasicBlock *BB = BF.getBasicBlockAtOffset(To)) {
if (BB->isEntryPoint())
EntryBB = BB;
}
if (EntryBB)
EntryBB->setExecutionCount(EntryBB->getKnownExecutionCount() + Count);
return true;
}
bool DataAggregator::recordExit(BinaryFunction &BF, uint64_t From, bool Mispred,
uint64_t Count) const {
if (!BF.isSimple() || From > BF.getSize())
return false;
if (!BF.hasProfile())
BF.ExecutionCount = 0;
return true;
}
ErrorOr<DataAggregator::LBREntry> DataAggregator::parseLBREntry() {
LBREntry Res;
ErrorOr<StringRef> FromStrRes = parseString('/');
if (std::error_code EC = FromStrRes.getError())
return EC;
StringRef OffsetStr = FromStrRes.get();
if (OffsetStr.getAsInteger(0, Res.From)) {
reportError("expected hexadecimal number with From address");
Diag << "Found: " << OffsetStr << "\n";
return make_error_code(llvm::errc::io_error);
}
ErrorOr<StringRef> ToStrRes = parseString('/');
if (std::error_code EC = ToStrRes.getError())
return EC;
OffsetStr = ToStrRes.get();
if (OffsetStr.getAsInteger(0, Res.To)) {
reportError("expected hexadecimal number with To address");
Diag << "Found: " << OffsetStr << "\n";
return make_error_code(llvm::errc::io_error);
}
ErrorOr<StringRef> MispredStrRes = parseString('/');
if (std::error_code EC = MispredStrRes.getError())
return EC;
StringRef MispredStr = MispredStrRes.get();
// SPE brstack mispredicted flags might be up to two characters long:
// 'PN' or 'MN'. Where 'N' optionally appears.
bool ValidStrSize = opts::ArmSPE
? MispredStr.size() >= 1 && MispredStr.size() <= 2
: MispredStr.size() == 1;
bool SpeTakenBitErr =
(opts::ArmSPE && MispredStr.size() == 2 && MispredStr[1] != 'N');
bool PredictionBitErr =
!ValidStrSize ||
(MispredStr[0] != 'P' && MispredStr[0] != 'M' && MispredStr[0] != '-');
if (SpeTakenBitErr)
reportError("expected 'N' as SPE prediction bit for a not-taken branch");
if (PredictionBitErr)
reportError("expected 'P', 'M' or '-' char as a prediction bit");
if (SpeTakenBitErr || PredictionBitErr) {
Diag << "Found: " << MispredStr << "\n";
return make_error_code(llvm::errc::io_error);
}
Res.Mispred = MispredStr[0] == 'M';
static bool MispredWarning = true;
if (MispredStr[0] == '-' && MispredWarning) {
errs() << "PERF2BOLT-WARNING: misprediction bit is missing in profile\n";
MispredWarning = false;
}
ErrorOr<StringRef> Rest = parseString(FieldSeparator, true);
if (std::error_code EC = Rest.getError())
return EC;
if (Rest.get().size() < 5) {
reportError("expected rest of LBR entry");
Diag << "Found: " << Rest.get() << "\n";
return make_error_code(llvm::errc::io_error);
}
return Res;
}
bool DataAggregator::checkAndConsumeFS() {
if (ParsingBuf[0] != FieldSeparator)
return false;
ParsingBuf = ParsingBuf.drop_front(1);
Col += 1;
return true;
}
void DataAggregator::consumeRestOfLine() {
size_t LineEnd = ParsingBuf.find_first_of('\n');
if (LineEnd == StringRef::npos) {
ParsingBuf = StringRef();
Col = 0;
Line += 1;
return;
}
ParsingBuf = ParsingBuf.drop_front(LineEnd + 1);
Col = 0;
Line += 1;
}
bool DataAggregator::checkNewLine() {
return ParsingBuf[0] == '\n';
}
ErrorOr<DataAggregator::PerfBranchSample> DataAggregator::parseBranchSample() {
PerfBranchSample Res;
while (checkAndConsumeFS()) {
}
ErrorOr<int64_t> PIDRes = parseNumberField(FieldSeparator, true);
if (std::error_code EC = PIDRes.getError())
return EC;
auto MMapInfoIter = BinaryMMapInfo.find(*PIDRes);
if (!BC->IsLinuxKernel && MMapInfoIter == BinaryMMapInfo.end()) {
consumeRestOfLine();
return make_error_code(errc::no_such_process);
}
if (checkAndConsumeNewLine())
return Res;
while (!checkAndConsumeNewLine()) {
checkAndConsumeFS();
ErrorOr<LBREntry> LBRRes = parseLBREntry();
if (std::error_code EC = LBRRes.getError())
return EC;
LBREntry LBR = LBRRes.get();
if (ignoreKernelInterrupt(LBR))
continue;
if (!BC->HasFixedLoadAddress)
adjustLBR(LBR, MMapInfoIter->second);
Res.LBR.push_back(LBR);
}
return Res;
}
ErrorOr<DataAggregator::PerfBasicSample> DataAggregator::parseBasicSample() {
while (checkAndConsumeFS()) {
}
ErrorOr<int64_t> PIDRes = parseNumberField(FieldSeparator, true);
if (std::error_code EC = PIDRes.getError())
return EC;
auto MMapInfoIter = BinaryMMapInfo.find(*PIDRes);
if (MMapInfoIter == BinaryMMapInfo.end()) {
consumeRestOfLine();
return PerfBasicSample{StringRef(), 0};
}
while (checkAndConsumeFS()) {
}
ErrorOr<StringRef> Event = parseString(FieldSeparator);
if (std::error_code EC = Event.getError())
return EC;
while (checkAndConsumeFS()) {
}
ErrorOr<uint64_t> AddrRes = parseHexField(FieldSeparator, true);
if (std::error_code EC = AddrRes.getError())
return EC;
if (!checkAndConsumeNewLine()) {
reportError("expected end of line");
return make_error_code(llvm::errc::io_error);
}
uint64_t Address = *AddrRes;
if (!BC->HasFixedLoadAddress)
adjustAddress(Address, MMapInfoIter->second);
return PerfBasicSample{Event.get(), Address};
}
ErrorOr<DataAggregator::PerfMemSample> DataAggregator::parseMemSample() {
PerfMemSample Res{0, 0};
while (checkAndConsumeFS()) {
}
ErrorOr<int64_t> PIDRes = parseNumberField(FieldSeparator, true);
if (std::error_code EC = PIDRes.getError())
return EC;
auto MMapInfoIter = BinaryMMapInfo.find(*PIDRes);
if (MMapInfoIter == BinaryMMapInfo.end()) {
consumeRestOfLine();
return Res;
}
while (checkAndConsumeFS()) {
}
ErrorOr<StringRef> Event = parseString(FieldSeparator);
if (std::error_code EC = Event.getError())
return EC;
if (!Event.get().contains("mem-loads")) {
consumeRestOfLine();
return Res;
}
while (checkAndConsumeFS()) {
}
ErrorOr<uint64_t> AddrRes = parseHexField(FieldSeparator);
if (std::error_code EC = AddrRes.getError())
return EC;
while (checkAndConsumeFS()) {
}
ErrorOr<uint64_t> PCRes = parseHexField(FieldSeparator, true);
if (std::error_code EC = PCRes.getError()) {
consumeRestOfLine();
return EC;
}
if (!checkAndConsumeNewLine()) {
reportError("expected end of line");
return make_error_code(llvm::errc::io_error);
}
uint64_t Address = *AddrRes;
if (!BC->HasFixedLoadAddress)
adjustAddress(Address, MMapInfoIter->second);
return PerfMemSample{PCRes.get(), Address};
}
ErrorOr<Location> DataAggregator::parseLocationOrOffset() {
auto parseOffset = [this]() -> ErrorOr<Location> {
ErrorOr<uint64_t> Res = parseHexField(FieldSeparator);
if (std::error_code EC = Res.getError())
return EC;
return Location(Res.get());
};
size_t Sep = ParsingBuf.find_first_of(" \n");
if (Sep == StringRef::npos)
return parseOffset();
StringRef LookAhead = ParsingBuf.substr(0, Sep);
if (!LookAhead.contains(':'))
return parseOffset();
ErrorOr<StringRef> BuildID = parseString(':');
if (std::error_code EC = BuildID.getError())
return EC;
ErrorOr<uint64_t> Offset = parseHexField(FieldSeparator);
if (std::error_code EC = Offset.getError())
return EC;
return Location(true, BuildID.get(), Offset.get());
}
std::error_code DataAggregator::parseAggregatedLBREntry() {
enum AggregatedLBREntry : char {
INVALID = 0,
EVENT_NAME, // E
TRACE, // T
SAMPLE, // S
BRANCH, // B
FT, // F
FT_EXTERNAL_ORIGIN // f
} Type = INVALID;
/// The number of fields to parse, set based on \p Type.
int AddrNum = 0;
int CounterNum = 0;
/// Storage for parsed fields.
StringRef EventName;
std::optional<Location> Addr[3];
int64_t Counters[2] = {0};
/// Parse strings: record type and optionally an event name.
while (Type == INVALID || Type == EVENT_NAME) {
while (checkAndConsumeFS()) {
}
ErrorOr<StringRef> StrOrErr =
parseString(FieldSeparator, Type == EVENT_NAME);
if (std::error_code EC = StrOrErr.getError())
return EC;
StringRef Str = StrOrErr.get();
if (Type == EVENT_NAME) {
EventName = Str;
break;
}
Type = StringSwitch<AggregatedLBREntry>(Str)
.Case("T", TRACE)
.Case("S", SAMPLE)
.Case("E", EVENT_NAME)
.Case("B", BRANCH)
.Case("F", FT)
.Case("f", FT_EXTERNAL_ORIGIN)
.Default(INVALID);
if (Type == INVALID) {
reportError("expected T, S, E, B, F or f");
return make_error_code(llvm::errc::io_error);
}
using SSI = StringSwitch<int>;
AddrNum = SSI(Str).Case("T", 3).Case("S", 1).Case("E", 0).Default(2);
CounterNum = SSI(Str).Case("B", 2).Case("E", 0).Default(1);
}
/// Parse locations depending on entry type, recording them in \p Addr array.
for (int I = 0; I < AddrNum; ++I) {
while (checkAndConsumeFS()) {
}
ErrorOr<Location> AddrOrErr = parseLocationOrOffset();
if (std::error_code EC = AddrOrErr.getError())
return EC;
Addr[I] = AddrOrErr.get();
}
/// Parse counters depending on entry type.
for (int I = 0; I < CounterNum; ++I) {
while (checkAndConsumeFS()) {
}
ErrorOr<int64_t> CountOrErr =
parseNumberField(FieldSeparator, I + 1 == CounterNum);
if (std::error_code EC = CountOrErr.getError())
return EC;
Counters[I] = CountOrErr.get();
}
/// Expect end of line here.
if (!checkAndConsumeNewLine()) {
reportError("expected end of line");
return make_error_code(llvm::errc::io_error);
}
/// Record event name into \p EventNames and return.
if (Type == EVENT_NAME) {
EventNames.insert(EventName);
return std::error_code();
}
const uint64_t FromOffset = Addr[0]->Offset;
BinaryFunction *FromFunc = getBinaryFunctionContainingAddress(FromOffset);
if (FromFunc)
FromFunc->setHasProfileAvailable();
int64_t Count = Counters[0];
int64_t Mispreds = Counters[1];
/// Record basic IP sample into \p BasicSamples and return.
if (Type == SAMPLE) {
BasicSamples[FromOffset] += Count;
NumTotalSamples += Count;
return std::error_code();
}
const uint64_t ToOffset = Addr[1]->Offset;
BinaryFunction *ToFunc = getBinaryFunctionContainingAddress(ToOffset);
if (ToFunc)
ToFunc->setHasProfileAvailable();
/// For legacy fall-through types, adjust locations to match Trace container.
if (Type == FT || Type == FT_EXTERNAL_ORIGIN) {
Addr[2] = Location(Addr[1]->Offset); // Trace To
Addr[1] = Location(Addr[0]->Offset); // Trace From
// Put a magic value into Trace Branch to differentiate from a full trace.
Addr[0] = Location(Type == FT ? Trace::FT_ONLY : Trace::FT_EXTERNAL_ORIGIN);
}
/// For legacy branch type, mark Trace To to differentite from a full trace.
if (Type == BRANCH) {
Addr[2] = Location(Trace::BR_ONLY);
}
/// Record a trace.
Trace T{Addr[0]->Offset, Addr[1]->Offset, Addr[2]->Offset};
TakenBranchInfo TI{(uint64_t)Count, (uint64_t)Mispreds};
Traces.emplace_back(T, TI);
NumTotalSamples += Count;
return std::error_code();
}
bool DataAggregator::ignoreKernelInterrupt(LBREntry &LBR) const {
return opts::IgnoreInterruptLBR &&
(LBR.From >= KernelBaseAddr || LBR.To >= KernelBaseAddr);
}
std::error_code DataAggregator::printLBRHeatMap() {
outs() << "PERF2BOLT: parse branch events...\n";
NamedRegionTimer T("buildHeatmap", "Building heatmap", TimerGroupName,
TimerGroupDesc, opts::TimeAggregator);
if (BC->IsLinuxKernel) {
opts::HeatmapMaxAddress = 0xffffffffffffffff;
opts::HeatmapMinAddress = KernelBaseAddr;
}
opts::HeatmapBlockSizes &HMBS = opts::HeatmapBlock;
Heatmap HM(HMBS[0], opts::HeatmapMinAddress, opts::HeatmapMaxAddress,
getTextSections(BC));
auto getSymbolValue = [&](const MCSymbol *Symbol) -> uint64_t {
if (Symbol)
if (ErrorOr<uint64_t> SymValue = BC->getSymbolValue(*Symbol))
return SymValue.get();
return 0;
};
HM.HotStart = getSymbolValue(BC->getHotTextStartSymbol());
HM.HotEnd = getSymbolValue(BC->getHotTextEndSymbol());
if (!NumTotalSamples) {
if (opts::BasicAggregation) {
errs() << "HEATMAP-ERROR: no basic event samples detected in profile. "
"Cannot build heatmap.";
} else {
errs() << "HEATMAP-ERROR: no LBR traces detected in profile. "
"Cannot build heatmap. Use -nl for building heatmap from "
"basic events.\n";
}
exit(1);
}
outs() << "HEATMAP: building heat map...\n";
// Register basic samples and perf LBR addresses not covered by fallthroughs.
for (const auto &[PC, Hits] : BasicSamples)
HM.registerAddress(PC, Hits);
for (const auto &[Trace, Info] : Traces)
if (Trace.To != Trace::BR_ONLY)
HM.registerAddressRange(Trace.From, Trace.To, Info.TakenCount);
if (HM.getNumInvalidRanges())
outs() << "HEATMAP: invalid traces: " << HM.getNumInvalidRanges() << '\n';
if (!HM.size()) {
errs() << "HEATMAP-ERROR: no valid traces registered\n";
exit(1);
}
HM.print(opts::HeatmapOutput);
if (opts::HeatmapOutput == "-") {
HM.printCDF(opts::HeatmapOutput);
HM.printSectionHotness(opts::HeatmapOutput);
} else {
HM.printCDF(opts::HeatmapOutput + ".csv");
HM.printSectionHotness(opts::HeatmapOutput + "-section-hotness.csv");
}
// Provide coarse-grained heatmaps if requested via zoom-out scales
for (const uint64_t NewBucketSize : ArrayRef(HMBS).drop_front()) {
HM.resizeBucket(NewBucketSize);
if (opts::HeatmapOutput == "-")
HM.print(opts::HeatmapOutput);
else
HM.print(formatv("{0}-{1}", opts::HeatmapOutput, NewBucketSize).str());
}
return std::error_code();
}
void DataAggregator::parseLBRSample(const PerfBranchSample &Sample,
bool NeedsSkylakeFix) {
// LBRs are stored in reverse execution order. NextLBR refers to the next
// executed branch record.
const LBREntry *NextLBR = nullptr;
uint32_t NumEntry = 0;
for (const LBREntry &LBR : Sample.LBR) {
++NumEntry;
// Hardware bug workaround: Intel Skylake (which has 32 LBR entries)
// sometimes record entry 32 as an exact copy of entry 31. This will cause
// us to likely record an invalid trace and generate a stale function for
// BAT mode (non BAT disassembles the function and is able to ignore this
// trace at aggregation time). Drop first 2 entries (last two, in
// chronological order)
if (NeedsSkylakeFix && NumEntry <= 2)
continue;
uint64_t TraceTo = NextLBR ? NextLBR->From : Trace::BR_ONLY;
NextLBR = &LBR;
TakenBranchInfo &Info = TraceMap[Trace{LBR.From, LBR.To, TraceTo}];
++Info.TakenCount;
Info.MispredCount += LBR.Mispred;
}
// Record LBR addresses not covered by fallthroughs (bottom-of-stack source
// and top-of-stack target) as basic samples for heatmap.
if (opts::HeatmapMode == opts::HeatmapModeKind::HM_Exclusive &&
!Sample.LBR.empty()) {
++BasicSamples[Sample.LBR.front().To];
++BasicSamples[Sample.LBR.back().From];
}
}
void DataAggregator::printLongRangeTracesDiagnostic() const {
outs() << "PERF2BOLT: out of range traces involving unknown regions: "
<< NumLongRangeTraces;
if (NumTraces > 0)
outs() << format(" (%.1f%%)", NumLongRangeTraces * 100.0f / NumTraces);
outs() << "\n";
}
static float printColoredPct(uint64_t Numerator, uint64_t Denominator, float T1,
float T2) {
if (Denominator == 0) {
outs() << "\n";
return 0;
}
float Percent = Numerator * 100.0f / Denominator;
outs() << " (";
if (outs().has_colors()) {
if (Percent > T2)
outs().changeColor(raw_ostream::RED);
else if (Percent > T1)
outs().changeColor(raw_ostream::YELLOW);
else
outs().changeColor(raw_ostream::GREEN);
}
outs() << format("%.1f%%", Percent);
if (outs().has_colors())
outs().resetColor();
outs() << ")\n";
return Percent;
}
void DataAggregator::printBranchSamplesDiagnostics() const {
outs() << "PERF2BOLT: traces mismatching disassembled function contents: "
<< NumInvalidTraces;
if (printColoredPct(NumInvalidTraces, NumTraces, 5, 10) > 10)
outs() << "\n !! WARNING !! This high mismatch ratio indicates the input "
"binary is probably not the same binary used during profiling "
"collection. The generated data may be ineffective for improving "
"performance\n\n";
printLongRangeTracesDiagnostic();
}
void DataAggregator::printBasicSamplesDiagnostics(
uint64_t OutOfRangeSamples) const {
outs() << "PERF2BOLT: out of range samples recorded in unknown regions: "
<< OutOfRangeSamples;
if (printColoredPct(OutOfRangeSamples, NumTotalSamples, 40, 60) > 80)
outs() << "\n !! WARNING !! This high mismatch ratio indicates the input "
"binary is probably not the same binary used during profiling "
"collection. The generated data may be ineffective for improving "
"performance\n\n";
}
void DataAggregator::printBranchStacksDiagnostics(
uint64_t IgnoredSamples) const {
outs() << "PERF2BOLT: ignored samples: " << IgnoredSamples;
if (printColoredPct(IgnoredSamples, NumTotalSamples, 20, 50) > 50)
errs() << "PERF2BOLT-WARNING: less than 50% of all recorded samples "
"were attributed to the input binary\n";
}
std::error_code DataAggregator::parseBranchEvents() {
std::string BranchEventTypeStr =
opts::ArmSPE ? "SPE branch events in LBR-format" : "branch events";
outs() << "PERF2BOLT: parse " << BranchEventTypeStr << "...\n";
NamedRegionTimer T("parseBranch", "Parsing branch events", TimerGroupName,
TimerGroupDesc, opts::TimeAggregator);
uint64_t NumEntries = 0;
uint64_t NumSamples = 0;
uint64_t NumSamplesNoLBR = 0;
bool NeedsSkylakeFix = false;
while (hasData() && NumTotalSamples < opts::MaxSamples) {
++NumTotalSamples;
ErrorOr<PerfBranchSample> SampleRes = parseBranchSample();
if (std::error_code EC = SampleRes.getError()) {
if (EC == errc::no_such_process)
continue;
return EC;
}
++NumSamples;
PerfBranchSample &Sample = SampleRes.get();
if (Sample.LBR.empty()) {
++NumSamplesNoLBR;
continue;
}
NumEntries += Sample.LBR.size();
if (this->BC->isX86() && BAT && Sample.LBR.size() == 32 &&
!NeedsSkylakeFix) {
errs() << "PERF2BOLT-WARNING: using Intel Skylake bug workaround\n";
NeedsSkylakeFix = true;
}
parseLBRSample(Sample, NeedsSkylakeFix);
}
Traces.reserve(TraceMap.size());
for (const auto &[Trace, Info] : TraceMap) {
Traces.emplace_back(Trace, Info);
for (const uint64_t Addr : {Trace.Branch, Trace.From})
if (BinaryFunction *BF = getBinaryFunctionContainingAddress(Addr))
BF->setHasProfileAvailable();
}
clear(TraceMap);
outs() << "PERF2BOLT: read " << NumSamples << " samples and " << NumEntries
<< " LBR entries\n";
if (NumTotalSamples) {
if (NumSamples && NumSamplesNoLBR == NumSamples) {
// Note: we don't know if perf2bolt is being used to parse memory samples
// at this point. In this case, it is OK to parse zero LBRs.
if (!opts::ArmSPE)
errs()
<< "PERF2BOLT-WARNING: all recorded samples for this binary lack "
"LBR. Record profile with perf record -j any or run perf2bolt "
"in no-LBR mode with -nl (the performance improvement in -nl "
"mode may be limited)\n";
else
errs()
<< "PERF2BOLT-WARNING: All recorded samples for this binary lack "
"SPE brstack entries. Make sure you are running Linux perf 6.14 "
"or later, otherwise you get zero samples. Record the profile "
"with: perf record -e 'arm_spe_0/branch_filter=1/'.";
} else {
printBranchStacksDiagnostics(NumTotalSamples - NumSamples);
}
}
return std::error_code();
}
void DataAggregator::processBranchEvents() {
outs() << "PERF2BOLT: processing branch events...\n";
NamedRegionTimer T("processBranch", "Processing branch events",
TimerGroupName, TimerGroupDesc, opts::TimeAggregator);
for (const auto &[Trace, Info] : Traces) {
bool IsReturn = checkReturn(Trace.Branch);
// Ignore returns.
if (!IsReturn && Trace.Branch != Trace::FT_ONLY &&
Trace.Branch != Trace::FT_EXTERNAL_ORIGIN)
doBranch(Trace.Branch, Trace.From, Info.TakenCount, Info.MispredCount);
if (Trace.To != Trace::BR_ONLY)
doTrace(Trace, Info.TakenCount, IsReturn);
}
printBranchSamplesDiagnostics();
}
std::error_code DataAggregator::parseBasicEvents() {
outs() << "PERF2BOLT: parsing basic events (without LBR)...\n";
NamedRegionTimer T("parseBasic", "Parsing basic events", TimerGroupName,
TimerGroupDesc, opts::TimeAggregator);
while (hasData()) {
ErrorOr<PerfBasicSample> Sample = parseBasicSample();
if (std::error_code EC = Sample.getError())
return EC;
if (!Sample->PC)
continue;
++NumTotalSamples;
if (BinaryFunction *BF = getBinaryFunctionContainingAddress(Sample->PC))
BF->setHasProfileAvailable();
++BasicSamples[Sample->PC];
EventNames.insert(Sample->EventName);
}
outs() << "PERF2BOLT: read " << NumTotalSamples << " basic samples\n";
return std::error_code();
}
void DataAggregator::processBasicEvents() {
outs() << "PERF2BOLT: processing basic events (without LBR)...\n";
NamedRegionTimer T("processBasic", "Processing basic events", TimerGroupName,
TimerGroupDesc, opts::TimeAggregator);
uint64_t OutOfRangeSamples = 0;
for (auto &Sample : BasicSamples) {
const uint64_t PC = Sample.first;
const uint64_t HitCount = Sample.second;
BinaryFunction *Func = getBinaryFunctionContainingAddress(PC);
if (!Func) {
OutOfRangeSamples += HitCount;
continue;
}
doBasicSample(*Func, PC, HitCount);
}
printBasicSamplesDiagnostics(OutOfRangeSamples);
}
std::error_code DataAggregator::parseMemEvents() {
outs() << "PERF2BOLT: parsing memory events...\n";
NamedRegionTimer T("parseMemEvents", "Parsing mem events", TimerGroupName,
TimerGroupDesc, opts::TimeAggregator);
while (hasData()) {
ErrorOr<PerfMemSample> Sample = parseMemSample();
if (std::error_code EC = Sample.getError())
return EC;
if (BinaryFunction *BF = getBinaryFunctionContainingAddress(Sample->PC))
BF->setHasProfileAvailable();
MemSamples.emplace_back(std::move(Sample.get()));
}
return std::error_code();
}
void DataAggregator::processMemEvents() {
NamedRegionTimer T("ProcessMemEvents", "Processing mem events",
TimerGroupName, TimerGroupDesc, opts::TimeAggregator);
for (const PerfMemSample &Sample : MemSamples) {
uint64_t PC = Sample.PC;
uint64_t Addr = Sample.Addr;
StringRef FuncName;
StringRef MemName;
// Try to resolve symbol for PC
BinaryFunction *Func = getBinaryFunctionContainingAddress(PC);
if (!Func) {
LLVM_DEBUG(if (PC != 0) {
dbgs() << formatv("Skipped mem event: {0:x} => {1:x}\n", PC, Addr);
});
continue;
}
FuncName = Func->getOneName();
PC -= Func->getAddress();
// Try to resolve symbol for memory load
if (BinaryData *BD = BC->getBinaryDataContainingAddress(Addr)) {
MemName = BD->getName();
Addr -= BD->getAddress();
} else if (opts::FilterMemProfile) {
// Filter out heap/stack accesses
continue;
}
const Location FuncLoc(!FuncName.empty(), FuncName, PC);
const Location AddrLoc(!MemName.empty(), MemName, Addr);
FuncMemData *MemData = &NamesToMemEvents[FuncName];
MemData->Name = FuncName;
setMemData(*Func, MemData);
MemData->update(FuncLoc, AddrLoc);
LLVM_DEBUG(dbgs() << "Mem event: " << FuncLoc << " = " << AddrLoc << "\n");
}
}
std::error_code DataAggregator::parsePreAggregatedLBRSamples() {
outs() << "PERF2BOLT: parsing pre-aggregated profile...\n";
NamedRegionTimer T("parseAggregated", "Parsing aggregated branch events",
TimerGroupName, TimerGroupDesc, opts::TimeAggregator);
size_t AggregatedLBRs = 0;
while (hasData()) {
if (std::error_code EC = parseAggregatedLBREntry())
return EC;
++AggregatedLBRs;
}
outs() << "PERF2BOLT: read " << AggregatedLBRs << " aggregated LBR entries\n";
return std::error_code();
}
std::optional<int32_t> DataAggregator::parseCommExecEvent() {
size_t LineEnd = ParsingBuf.find_first_of("\n");
if (LineEnd == StringRef::npos) {
reportError("expected rest of line");
Diag << "Found: " << ParsingBuf << "\n";
return std::nullopt;
}
StringRef Line = ParsingBuf.substr(0, LineEnd);
size_t Pos = Line.find("PERF_RECORD_COMM exec");
if (Pos == StringRef::npos)
return std::nullopt;
Line = Line.drop_front(Pos);
// Line:
// PERF_RECORD_COMM exec: <name>:<pid>/<tid>"
StringRef PIDStr = Line.rsplit(':').second.split('/').first;
int32_t PID;
if (PIDStr.getAsInteger(10, PID)) {
reportError("expected PID");
Diag << "Found: " << PIDStr << "in '" << Line << "'\n";
return std::nullopt;
}
return PID;
}
namespace {
std::optional<uint64_t> parsePerfTime(const StringRef TimeStr) {
const StringRef SecTimeStr = TimeStr.split('.').first;
const StringRef USecTimeStr = TimeStr.split('.').second;
uint64_t SecTime;
uint64_t USecTime;
if (SecTimeStr.getAsInteger(10, SecTime) ||
USecTimeStr.getAsInteger(10, USecTime))
return std::nullopt;
return SecTime * 1000000ULL + USecTime;
}
}
std::optional<DataAggregator::ForkInfo> DataAggregator::parseForkEvent() {
while (checkAndConsumeFS()) {
}
size_t LineEnd = ParsingBuf.find_first_of("\n");
if (LineEnd == StringRef::npos) {
reportError("expected rest of line");
Diag << "Found: " << ParsingBuf << "\n";
return std::nullopt;
}
StringRef Line = ParsingBuf.substr(0, LineEnd);
size_t Pos = Line.find("PERF_RECORD_FORK");
if (Pos == StringRef::npos) {
consumeRestOfLine();
return std::nullopt;
}
ForkInfo FI;
const StringRef TimeStr =
Line.substr(0, Pos).rsplit(':').first.rsplit(FieldSeparator).second;
if (std::optional<uint64_t> TimeRes = parsePerfTime(TimeStr)) {
FI.Time = *TimeRes;
}
Line = Line.drop_front(Pos);
// Line:
// PERF_RECORD_FORK(<child_pid>:<child_tid>):(<parent_pid>:<parent_tid>)
const StringRef ChildPIDStr = Line.split('(').second.split(':').first;
if (ChildPIDStr.getAsInteger(10, FI.ChildPID)) {
reportError("expected PID");
Diag << "Found: " << ChildPIDStr << "in '" << Line << "'\n";
return std::nullopt;
}
const StringRef ParentPIDStr = Line.rsplit('(').second.split(':').first;
if (ParentPIDStr.getAsInteger(10, FI.ParentPID)) {
reportError("expected PID");
Diag << "Found: " << ParentPIDStr << "in '" << Line << "'\n";
return std::nullopt;
}
consumeRestOfLine();
return FI;
}
ErrorOr<std::pair<StringRef, DataAggregator::MMapInfo>>
DataAggregator::parseMMapEvent() {
while (checkAndConsumeFS()) {
}
MMapInfo ParsedInfo;
size_t LineEnd = ParsingBuf.find_first_of("\n");
if (LineEnd == StringRef::npos) {
reportError("expected rest of line");
Diag << "Found: " << ParsingBuf << "\n";
return make_error_code(llvm::errc::io_error);
}
StringRef Line = ParsingBuf.substr(0, LineEnd);
size_t Pos = Line.find("PERF_RECORD_MMAP2");
if (Pos == StringRef::npos) {
consumeRestOfLine();
return std::make_pair(StringRef(), ParsedInfo);
}
// Line:
// {<name> .* <sec>.<usec>: }PERF_RECORD_MMAP2 <pid>/<tid>: .* <file_name>
const StringRef TimeStr =
Line.substr(0, Pos).rsplit(':').first.rsplit(FieldSeparator).second;
if (std::optional<uint64_t> TimeRes = parsePerfTime(TimeStr))
ParsedInfo.Time = *TimeRes;
Line = Line.drop_front(Pos);
// Line:
// PERF_RECORD_MMAP2 <pid>/<tid>: [<hexbase>(<hexsize>) .*]: .* <file_name>
StringRef FileName = Line.rsplit(FieldSeparator).second;
if (FileName.starts_with("//") || FileName.starts_with("[")) {
consumeRestOfLine();
return std::make_pair(StringRef(), ParsedInfo);
}
FileName = sys::path::filename(FileName);
const StringRef PIDStr = Line.split(FieldSeparator).second.split('/').first;
if (PIDStr.getAsInteger(10, ParsedInfo.PID)) {
reportError("expected PID");
Diag << "Found: " << PIDStr << "in '" << Line << "'\n";
return make_error_code(llvm::errc::io_error);
}
const StringRef BaseAddressStr = Line.split('[').second.split('(').first;
if (BaseAddressStr.getAsInteger(0, ParsedInfo.MMapAddress)) {
reportError("expected base address");
Diag << "Found: " << BaseAddressStr << "in '" << Line << "'\n";
return make_error_code(llvm::errc::io_error);
}
const StringRef SizeStr = Line.split('(').second.split(')').first;
if (SizeStr.getAsInteger(0, ParsedInfo.Size)) {
reportError("expected mmaped size");
Diag << "Found: " << SizeStr << "in '" << Line << "'\n";
return make_error_code(llvm::errc::io_error);
}
const StringRef OffsetStr =
Line.split('@').second.ltrim().split(FieldSeparator).first;
if (OffsetStr.getAsInteger(0, ParsedInfo.Offset)) {
reportError("expected mmaped page-aligned offset");
Diag << "Found: " << OffsetStr << "in '" << Line << "'\n";
return make_error_code(llvm::errc::io_error);
}
consumeRestOfLine();
return std::make_pair(FileName, ParsedInfo);
}
std::error_code DataAggregator::parseMMapEvents() {
outs() << "PERF2BOLT: parsing perf-script mmap events output\n";
NamedRegionTimer T("parseMMapEvents", "Parsing mmap events", TimerGroupName,
TimerGroupDesc, opts::TimeAggregator);
std::multimap<StringRef, MMapInfo> GlobalMMapInfo;
while (hasData()) {
ErrorOr<std::pair<StringRef, MMapInfo>> FileMMapInfoRes = parseMMapEvent();
if (std::error_code EC = FileMMapInfoRes.getError())
return EC;
std::pair<StringRef, MMapInfo> FileMMapInfo = FileMMapInfoRes.get();
if (FileMMapInfo.second.PID == -1)
continue;
if (FileMMapInfo.first == "(deleted)")
continue;
GlobalMMapInfo.insert(FileMMapInfo);
}
LLVM_DEBUG({
dbgs() << "FileName -> mmap info:\n"
<< " Filename : PID [MMapAddr, Size, Offset]\n";
for (const auto &[Name, MMap] : GlobalMMapInfo)
dbgs() << formatv(" {0} : {1} [{2:x}, {3:x} @ {4:x}]\n", Name, MMap.PID,
MMap.MMapAddress, MMap.Size, MMap.Offset);
});
StringRef NameToUse = llvm::sys::path::filename(BC->getFilename());
if (GlobalMMapInfo.count(NameToUse) == 0 && !BuildIDBinaryName.empty()) {
errs() << "PERF2BOLT-WARNING: using \"" << BuildIDBinaryName
<< "\" for profile matching\n";
NameToUse = BuildIDBinaryName;
}
auto Range = GlobalMMapInfo.equal_range(NameToUse);
for (MMapInfo &MMapInfo : llvm::make_second_range(make_range(Range))) {
if (BC->HasFixedLoadAddress && MMapInfo.MMapAddress) {
// Check that the binary mapping matches one of the segments.
bool MatchFound = llvm::any_of(
llvm::make_second_range(BC->SegmentMapInfo),
[&](SegmentInfo &SegInfo) {
// The mapping is page-aligned and hence the MMapAddress could be
// different from the segment start address. We cannot know the page
// size of the mapping, but we know it should not exceed the segment
// alignment value. Hence we are performing an approximate check.
return SegInfo.Address >= MMapInfo.MMapAddress &&
SegInfo.Address - MMapInfo.MMapAddress < SegInfo.Alignment &&
SegInfo.IsExecutable;
});
if (!MatchFound) {
errs() << "PERF2BOLT-WARNING: ignoring mapping of " << NameToUse
<< " at 0x" << Twine::utohexstr(MMapInfo.MMapAddress) << '\n';
continue;
}
}
// Set base address for shared objects.
if (!BC->HasFixedLoadAddress) {
std::optional<uint64_t> BaseAddress =
BC->getBaseAddressForMapping(MMapInfo.MMapAddress, MMapInfo.Offset);
if (!BaseAddress) {
errs() << "PERF2BOLT-WARNING: unable to find base address of the "
"binary when memory mapped at 0x"
<< Twine::utohexstr(MMapInfo.MMapAddress)
<< " using file offset 0x" << Twine::utohexstr(MMapInfo.Offset)
<< ". Ignoring profile data for this mapping\n";
continue;
}
MMapInfo.BaseAddress = *BaseAddress;
}
// Try to add MMapInfo to the map and update its size. Large binaries may
// span to multiple text segments, so the mapping is inserted only on the
// first occurrence.
if (!BinaryMMapInfo.insert(std::make_pair(MMapInfo.PID, MMapInfo)).second)
assert(MMapInfo.BaseAddress == BinaryMMapInfo[MMapInfo.PID].BaseAddress &&
"Base address on multiple segment mappings should match");
// Update mapping size.
const uint64_t EndAddress = MMapInfo.MMapAddress + MMapInfo.Size;
const uint64_t Size = EndAddress - BinaryMMapInfo[MMapInfo.PID].BaseAddress;
if (Size > BinaryMMapInfo[MMapInfo.PID].Size)
BinaryMMapInfo[MMapInfo.PID].Size = Size;
}
if (BinaryMMapInfo.empty()) {
if (errs().has_colors())
errs().changeColor(raw_ostream::RED);
errs() << "PERF2BOLT-ERROR: could not find a profile matching binary \""
<< BC->getFilename() << "\".";
if (!GlobalMMapInfo.empty()) {
errs() << " Profile for the following binary name(s) is available:\n";
for (auto I = GlobalMMapInfo.begin(), IE = GlobalMMapInfo.end(); I != IE;
I = GlobalMMapInfo.upper_bound(I->first))
errs() << " " << I->first << '\n';
errs() << "Please rename the input binary.\n";
} else {
errs() << " Failed to extract any binary name from a profile.\n";
}
if (errs().has_colors())
errs().resetColor();
exit(1);
}
return std::error_code();
}
std::error_code DataAggregator::parseTaskEvents() {
outs() << "PERF2BOLT: parsing perf-script task events output\n";
NamedRegionTimer T("parseTaskEvents", "Parsing task events", TimerGroupName,
TimerGroupDesc, opts::TimeAggregator);
while (hasData()) {
if (std::optional<int32_t> CommInfo = parseCommExecEvent()) {
// Remove forked child that ran execve
auto MMapInfoIter = BinaryMMapInfo.find(*CommInfo);
if (MMapInfoIter != BinaryMMapInfo.end() && MMapInfoIter->second.Forked)
BinaryMMapInfo.erase(MMapInfoIter);
consumeRestOfLine();
continue;
}
std::optional<ForkInfo> ForkInfo = parseForkEvent();
if (!ForkInfo)
continue;
if (ForkInfo->ParentPID == ForkInfo->ChildPID)
continue;
if (ForkInfo->Time == 0) {
// Process was forked and mmaped before perf ran. In this case the child
// should have its own mmap entry unless it was execve'd.
continue;
}
auto MMapInfoIter = BinaryMMapInfo.find(ForkInfo->ParentPID);
if (MMapInfoIter == BinaryMMapInfo.end())
continue;
MMapInfo MMapInfo = MMapInfoIter->second;
MMapInfo.PID = ForkInfo->ChildPID;
MMapInfo.Forked = true;
BinaryMMapInfo.insert(std::make_pair(MMapInfo.PID, MMapInfo));
}
outs() << "PERF2BOLT: input binary is associated with "
<< BinaryMMapInfo.size() << " PID(s)\n";
LLVM_DEBUG({
for (const MMapInfo &MMI : llvm::make_second_range(BinaryMMapInfo))
outs() << formatv(" {0}{1}: ({2:x}: {3:x})\n", MMI.PID,
(MMI.Forked ? " (forked)" : ""), MMI.MMapAddress,
MMI.Size);
});
return std::error_code();
}
std::optional<std::pair<StringRef, StringRef>>
DataAggregator::parseNameBuildIDPair() {
while (checkAndConsumeFS()) {
}
ErrorOr<StringRef> BuildIDStr = parseString(FieldSeparator, true);
if (std::error_code EC = BuildIDStr.getError())
return std::nullopt;
// If one of the strings is missing, don't issue a parsing error, but still
// do not return a value.
consumeAllRemainingFS();
if (checkNewLine())
return std::nullopt;
ErrorOr<StringRef> NameStr = parseString(FieldSeparator, true);
if (std::error_code EC = NameStr.getError())
return std::nullopt;
consumeRestOfLine();
return std::make_pair(NameStr.get(), BuildIDStr.get());
}
bool DataAggregator::hasAllBuildIDs() {
const StringRef SavedParsingBuf = ParsingBuf;
if (!hasData())
return false;
bool HasInvalidEntries = false;
while (hasData()) {
if (!parseNameBuildIDPair()) {
HasInvalidEntries = true;
break;
}
}
ParsingBuf = SavedParsingBuf;
return !HasInvalidEntries;
}
std::optional<StringRef>
DataAggregator::getFileNameForBuildID(StringRef FileBuildID) {
const StringRef SavedParsingBuf = ParsingBuf;
StringRef FileName;
while (hasData()) {
std::optional<std::pair<StringRef, StringRef>> IDPair =
parseNameBuildIDPair();
if (!IDPair) {
consumeRestOfLine();
continue;
}
if (IDPair->second.starts_with(FileBuildID)) {
FileName = sys::path::filename(IDPair->first);
break;
}
}
ParsingBuf = SavedParsingBuf;
if (!FileName.empty())
return FileName;
return std::nullopt;
}
std::error_code
DataAggregator::writeAggregatedFile(StringRef OutputFilename) const {
std::error_code EC;
raw_fd_ostream OutFile(OutputFilename, EC, sys::fs::OpenFlags::OF_None);
if (EC)
return EC;
bool WriteMemLocs = false;
auto writeLocation = [&OutFile, &WriteMemLocs](const Location &Loc) {
if (WriteMemLocs)
OutFile << (Loc.IsSymbol ? "4 " : "3 ");
else
OutFile << (Loc.IsSymbol ? "1 " : "0 ");
OutFile << (Loc.Name.empty() ? "[unknown]" : getEscapedName(Loc.Name))
<< " " << Twine::utohexstr(Loc.Offset) << FieldSeparator;
};
uint64_t BranchValues = 0;
uint64_t MemValues = 0;
if (BAT)
OutFile << "boltedcollection\n";
if (opts::BasicAggregation) {
OutFile << "no_lbr";
for (const StringMapEntry<std::nullopt_t> &Entry : EventNames)
OutFile << " " << Entry.getKey();
OutFile << "\n";
for (const auto &KV : NamesToBasicSamples) {
const FuncBasicSampleData &FSD = KV.second;
for (const BasicSampleInfo &SI : FSD.Data) {
writeLocation(SI.Loc);
OutFile << SI.Hits << "\n";
++BranchValues;
}
}
} else {
for (const auto &KV : NamesToBranches) {
const FuncBranchData &FBD = KV.second;
for (const BranchInfo &BI : FBD.Data) {
writeLocation(BI.From);
writeLocation(BI.To);
OutFile << BI.Mispreds << " " << BI.Branches << "\n";
++BranchValues;
}
for (const BranchInfo &BI : FBD.EntryData) {
// Do not output if source is a known symbol, since this was already
// accounted for in the source function
if (BI.From.IsSymbol)
continue;
writeLocation(BI.From);
writeLocation(BI.To);
OutFile << BI.Mispreds << " " << BI.Branches << "\n";
++BranchValues;
}
}
WriteMemLocs = true;
for (const auto &KV : NamesToMemEvents) {
const FuncMemData &FMD = KV.second;
for (const MemInfo &MemEvent : FMD.Data) {
writeLocation(MemEvent.Offset);
writeLocation(MemEvent.Addr);
OutFile << MemEvent.Count << "\n";
++MemValues;
}
}
}
outs() << "PERF2BOLT: wrote " << BranchValues << " objects and " << MemValues
<< " memory objects to " << OutputFilename << "\n";
return std::error_code();
}
std::error_code DataAggregator::writeBATYAML(BinaryContext &BC,
StringRef OutputFilename) const {
std::error_code EC;
raw_fd_ostream OutFile(OutputFilename, EC, sys::fs::OpenFlags::OF_None);
if (EC)
return EC;
yaml::bolt::BinaryProfile BP;
const MCPseudoProbeDecoder *PseudoProbeDecoder =
opts::ProfileWritePseudoProbes ? BC.getPseudoProbeDecoder() : nullptr;
// Fill out the header info.
BP.Header.Version = 1;
BP.Header.FileName = std::string(BC.getFilename());
std::optional<StringRef> BuildID = BC.getFileBuildID();
BP.Header.Id = BuildID ? std::string(*BuildID) : "<unknown>";
BP.Header.Origin = std::string(getReaderName());
// Only the input binary layout order is supported.
BP.Header.IsDFSOrder = false;
// FIXME: Need to match hash function used to produce BAT hashes.
BP.Header.HashFunction = HashFunction::Default;
ListSeparator LS(",");
raw_string_ostream EventNamesOS(BP.Header.EventNames);
for (const StringMapEntry<std::nullopt_t> &EventEntry : EventNames)
EventNamesOS << LS << EventEntry.first().str();
BP.Header.Flags = opts::BasicAggregation ? BinaryFunction::PF_BASIC
: BinaryFunction::PF_BRANCH;
// Add probe inline tree nodes.
YAMLProfileWriter::InlineTreeDesc InlineTree;
if (PseudoProbeDecoder)
std::tie(BP.PseudoProbeDesc, InlineTree) =
YAMLProfileWriter::convertPseudoProbeDesc(*PseudoProbeDecoder);
if (!opts::BasicAggregation) {
// Convert profile for functions not covered by BAT
for (auto &BFI : BC.getBinaryFunctions()) {
BinaryFunction &Function = BFI.second;
if (!Function.hasProfile())
continue;
if (BAT->isBATFunction(Function.getAddress()))
continue;
BP.Functions.emplace_back(YAMLProfileWriter::convert(
Function, /*UseDFS=*/false, InlineTree, BAT));
}
for (const auto &KV : NamesToBranches) {
const StringRef FuncName = KV.first;
const FuncBranchData &Branches = KV.second;
yaml::bolt::BinaryFunctionProfile YamlBF;
BinaryData *BD = BC.getBinaryDataByName(FuncName);
assert(BD);
uint64_t FuncAddress = BD->getAddress();
if (!BAT->isBATFunction(FuncAddress))
continue;
BinaryFunction *BF = BC.getBinaryFunctionAtAddress(FuncAddress);
assert(BF);
YamlBF.Name = getLocationName(*BF, BAT);
YamlBF.Id = BF->getFunctionNumber();
YamlBF.Hash = BAT->getBFHash(FuncAddress);
YamlBF.ExecCount = BF->getKnownExecutionCount();
YamlBF.ExternEntryCount = BF->getExternEntryCount();
YamlBF.NumBasicBlocks = BAT->getNumBasicBlocks(FuncAddress);
const BoltAddressTranslation::BBHashMapTy &BlockMap =
BAT->getBBHashMap(FuncAddress);
YamlBF.Blocks.resize(YamlBF.NumBasicBlocks);
for (auto &&[Entry, YamlBB] : llvm::zip(BlockMap, YamlBF.Blocks)) {
const auto &Block = Entry.second;
YamlBB.Hash = Block.Hash;
YamlBB.Index = Block.Index;
}
// Lookup containing basic block offset and index
auto getBlock = [&BlockMap](uint32_t Offset) {
auto BlockIt = BlockMap.upper_bound(Offset);
if (LLVM_UNLIKELY(BlockIt == BlockMap.begin())) {
errs() << "BOLT-ERROR: invalid BAT section\n";
exit(1);
}
--BlockIt;
return std::pair(BlockIt->first, BlockIt->second.Index);
};
for (const BranchInfo &BI : Branches.Data) {
using namespace yaml::bolt;
const auto &[BlockOffset, BlockIndex] = getBlock(BI.From.Offset);
BinaryBasicBlockProfile &YamlBB = YamlBF.Blocks[BlockIndex];
if (BI.To.IsSymbol && BI.To.Name == BI.From.Name && BI.To.Offset != 0) {
// Internal branch
const unsigned SuccIndex = getBlock(BI.To.Offset).second;
auto &SI = YamlBB.Successors.emplace_back(SuccessorInfo{SuccIndex});
SI.Count = BI.Branches;
SI.Mispreds = BI.Mispreds;
} else {
// Call
const uint32_t Offset = BI.From.Offset - BlockOffset;
auto &CSI = YamlBB.CallSites.emplace_back(CallSiteInfo{Offset});
CSI.Count = BI.Branches;
CSI.Mispreds = BI.Mispreds;
if (const BinaryData *BD = BC.getBinaryDataByName(BI.To.Name))
YAMLProfileWriter::setCSIDestination(BC, CSI, BD->getSymbol(), BAT,
BI.To.Offset);
}
}
// Set entry counts, similar to DataReader::readProfile.
for (const BranchInfo &BI : Branches.EntryData) {
if (!BlockMap.isInputBlock(BI.To.Offset)) {
if (opts::Verbosity >= 1)
errs() << "BOLT-WARNING: Unexpected EntryData in " << FuncName
<< " at 0x" << Twine::utohexstr(BI.To.Offset) << '\n';
continue;
}
const unsigned BlockIndex = BlockMap.getBBIndex(BI.To.Offset);
YamlBF.Blocks[BlockIndex].ExecCount += BI.Branches;
}
if (PseudoProbeDecoder) {
DenseMap<const MCDecodedPseudoProbeInlineTree *, uint32_t>
InlineTreeNodeId;
if (BF->getGUID()) {
std::tie(YamlBF.InlineTree, InlineTreeNodeId) =
YAMLProfileWriter::convertBFInlineTree(*PseudoProbeDecoder,
InlineTree, BF->getGUID());
}
// Fetch probes belonging to all fragments
const AddressProbesMap &ProbeMap =
PseudoProbeDecoder->getAddress2ProbesMap();
BinaryFunction::FragmentsSetTy Fragments(BF->Fragments);
Fragments.insert(BF);
DenseMap<
uint32_t,
std::vector<std::reference_wrapper<const MCDecodedPseudoProbe>>>
BlockProbes;
for (const BinaryFunction *F : Fragments) {
const uint64_t FuncAddr = F->getAddress();
for (const MCDecodedPseudoProbe &Probe :
ProbeMap.find(FuncAddr, FuncAddr + F->getSize())) {
const uint32_t OutputAddress = Probe.getAddress();
const uint32_t InputOffset = BAT->translate(
FuncAddr, OutputAddress - FuncAddr, /*IsBranchSrc=*/true);
const unsigned BlockIndex = getBlock(InputOffset).second;
BlockProbes[BlockIndex].emplace_back(Probe);
}
}
for (auto &[Block, Probes] : BlockProbes) {
YamlBF.Blocks[Block].PseudoProbes =
YAMLProfileWriter::writeBlockProbes(Probes, InlineTreeNodeId);
}
}
// Skip printing if there's no profile data
llvm::erase_if(
YamlBF.Blocks, [](const yaml::bolt::BinaryBasicBlockProfile &YamlBB) {
auto HasCount = [](const auto &SI) { return SI.Count; };
bool HasAnyCount = YamlBB.ExecCount ||
llvm::any_of(YamlBB.Successors, HasCount) ||
llvm::any_of(YamlBB.CallSites, HasCount);
return !HasAnyCount;
});
BP.Functions.emplace_back(YamlBF);
}
}
// Write the profile.
yaml::Output Out(OutFile, nullptr, 0);
Out << BP;
return std::error_code();
}
void DataAggregator::dump() const { DataReader::dump(); }
void DataAggregator::dump(const PerfBranchSample &Sample) const {
Diag << "Sample LBR entries: " << Sample.LBR.size() << "\n";
for (const LBREntry &LBR : Sample.LBR)
Diag << LBR << '\n';
}
void DataAggregator::dump(const PerfMemSample &Sample) const {
Diag << "Sample mem entries: " << Sample.PC << ": " << Sample.Addr << "\n";
}
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