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59ffba4f90
This include some changes related with PerfReader's the input check and command line change: 1) It appears there might be thousands of leading MMAP-Event line in the perfscript for large workload. For this case, the 4k threshold is not eligible to determine it's a hybrid sample. This change renovated the `isHybridPerfScript` by going through the script without threshold limitation checking whether there is a non-empty call stack immediately followed by a LBR sample. It will stop once it find a valid one. 2) Added several input validations for the command line switches in PerfReader. 3) Changed the command line `show-disassembly` to `show-disassembly-only`, it will print to stdout and exit early which leave an empty output profile. Reviewed By: hoy, wenlei Differential Revision: https://reviews.llvm.org/D96387
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
//===- llvm-profgen.cpp - LLVM SPGO profile generation tool -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// llvm-profgen generates SPGO profiles from perf script ouput.
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//
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//===----------------------------------------------------------------------===//
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#include "ErrorHandling.h"
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#include "PerfReader.h"
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#include "ProfileGenerator.h"
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#include "ProfiledBinary.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/InitLLVM.h"
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#include "llvm/Support/TargetSelect.h"
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static cl::list<std::string> PerfTraceFilenames(
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"perfscript", cl::value_desc("perfscript"), cl::OneOrMore,
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llvm::cl::MiscFlags::CommaSeparated,
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cl::desc("Path of perf-script trace created by Linux perf tool with "
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"`script` command(the raw perf.data should be profiled with -b)"));
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static cl::list<std::string>
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BinaryFilenames("binary", cl::value_desc("binary"), cl::OneOrMore,
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llvm::cl::MiscFlags::CommaSeparated,
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cl::desc("Path of profiled binary files"));
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extern cl::opt<bool> ShowDisassemblyOnly;
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using namespace llvm;
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using namespace sampleprof;
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int main(int argc, const char *argv[]) {
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InitLLVM X(argc, argv);
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// Initialize targets and assembly printers/parsers.
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InitializeAllTargetInfos();
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InitializeAllTargetMCs();
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InitializeAllDisassemblers();
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cl::ParseCommandLineOptions(argc, argv, "llvm SPGO profile generator\n");
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// Load binaries and parse perf events and samples
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PerfReader Reader(BinaryFilenames, PerfTraceFilenames);
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if (ShowDisassemblyOnly)
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return EXIT_SUCCESS;
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Reader.parsePerfTraces(PerfTraceFilenames);
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std::unique_ptr<ProfileGenerator> Generator = ProfileGenerator::create(
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Reader.getBinarySampleCounters(), Reader.getPerfScriptType());
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Generator->generateProfile();
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Generator->write();
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return EXIT_SUCCESS;
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}
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