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llvm-mirror/unittests/ProfileData/SampleProfTest.cpp
Wei Mi 47e2f8a30e [SampleFDO] Add profile symbol list section to discriminate function being 
cold versus function being newly added.

This is the second half of https://reviews.llvm.org/D66374.

Profile symbol list is the collection of function symbols showing up in
the binary which generates the current profile. It is used to discriminate
function being cold versus function being newly added. Profile symbol list
is only added for profile with ExtBinary format.

During profile use compilation, when profile-sample-accurate is enabled,
a function without profile will be regarded as cold only when it is
contained in that list.

Differential Revision: https://reviews.llvm.org/D66766

llvm-svn: 370563
2019-08-31 02:27:26 +00:00

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//===- unittest/ProfileData/SampleProfTest.cpp ------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/ProfileData/SampleProf.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/ProfileData/SampleProfReader.h"
#include "llvm/ProfileData/SampleProfWriter.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include "gtest/gtest.h"
#include <string>
#include <vector>
using namespace llvm;
using namespace sampleprof;
static ::testing::AssertionResult NoError(std::error_code EC) {
if (!EC)
return ::testing::AssertionSuccess();
return ::testing::AssertionFailure() << "error " << EC.value() << ": "
<< EC.message();
}
namespace {
struct SampleProfTest : ::testing::Test {
LLVMContext Context;
std::unique_ptr<SampleProfileWriter> Writer;
std::unique_ptr<SampleProfileReader> Reader;
SampleProfTest() : Writer(), Reader() {}
void createWriter(SampleProfileFormat Format, StringRef Profile) {
std::error_code EC;
std::unique_ptr<raw_ostream> OS(
new raw_fd_ostream(Profile, EC, sys::fs::OF_None));
auto WriterOrErr = SampleProfileWriter::create(OS, Format);
ASSERT_TRUE(NoError(WriterOrErr.getError()));
Writer = std::move(WriterOrErr.get());
}
void readProfile(const Module &M, StringRef Profile) {
auto ReaderOrErr = SampleProfileReader::create(Profile, Context);
ASSERT_TRUE(NoError(ReaderOrErr.getError()));
Reader = std::move(ReaderOrErr.get());
Reader->collectFuncsToUse(M);
}
void testRoundTrip(SampleProfileFormat Format, bool Remap) {
SmallVector<char, 128> ProfilePath;
ASSERT_TRUE(NoError(llvm::sys::fs::createTemporaryFile("profile", "", ProfilePath)));
StringRef Profile(ProfilePath.data(), ProfilePath.size());
createWriter(Format, Profile);
StringRef FooName("_Z3fooi");
FunctionSamples FooSamples;
FooSamples.setName(FooName);
FooSamples.addTotalSamples(7711);
FooSamples.addHeadSamples(610);
FooSamples.addBodySamples(1, 0, 610);
FooSamples.addBodySamples(2, 0, 600);
FooSamples.addBodySamples(4, 0, 60000);
FooSamples.addBodySamples(8, 0, 60351);
FooSamples.addBodySamples(10, 0, 605);
StringRef BarName("_Z3bari");
FunctionSamples BarSamples;
BarSamples.setName(BarName);
BarSamples.addTotalSamples(20301);
BarSamples.addHeadSamples(1437);
BarSamples.addBodySamples(1, 0, 1437);
// Test how reader/writer handles unmangled names.
StringRef MconstructName("_M_construct<char *>");
StringRef StringviewName("string_view<std::allocator<char> >");
BarSamples.addCalledTargetSamples(1, 0, MconstructName, 1000);
BarSamples.addCalledTargetSamples(1, 0, StringviewName, 437);
Module M("my_module", Context);
FunctionType *fn_type =
FunctionType::get(Type::getVoidTy(Context), {}, false);
M.getOrInsertFunction(FooName, fn_type);
M.getOrInsertFunction(BarName, fn_type);
StringMap<FunctionSamples> Profiles;
Profiles[FooName] = std::move(FooSamples);
Profiles[BarName] = std::move(BarSamples);
ProfileSymbolList List;
if (Format == SampleProfileFormat::SPF_Ext_Binary) {
List.add("zoo", true);
List.add("moo", true);
}
Writer->setProfileSymbolList(&List);
std::error_code EC;
EC = Writer->write(Profiles);
ASSERT_TRUE(NoError(EC));
Writer->getOutputStream().flush();
readProfile(M, Profile);
EC = Reader->read();
ASSERT_TRUE(NoError(EC));
if (Format == SampleProfileFormat::SPF_Ext_Binary) {
std::unique_ptr<ProfileSymbolList> ReaderList =
Reader->getProfileSymbolList();
ReaderList->contains("zoo");
ReaderList->contains("moo");
}
if (Remap) {
auto MemBuffer = llvm::MemoryBuffer::getMemBuffer(R"(
# Types 'int' and 'long' are equivalent
type i l
# Function names 'foo' and 'faux' are equivalent
name 3foo 4faux
)");
Reader.reset(new SampleProfileReaderItaniumRemapper(
std::move(MemBuffer), Context, std::move(Reader)));
FooName = "_Z4fauxi";
BarName = "_Z3barl";
EC = Reader->read();
ASSERT_TRUE(NoError(EC));
}
ASSERT_EQ(2u, Reader->getProfiles().size());
FunctionSamples *ReadFooSamples = Reader->getSamplesFor(FooName);
ASSERT_TRUE(ReadFooSamples != nullptr);
if (Format != SampleProfileFormat::SPF_Compact_Binary) {
ASSERT_EQ("_Z3fooi", ReadFooSamples->getName());
}
ASSERT_EQ(7711u, ReadFooSamples->getTotalSamples());
ASSERT_EQ(610u, ReadFooSamples->getHeadSamples());
FunctionSamples *ReadBarSamples = Reader->getSamplesFor(BarName);
ASSERT_TRUE(ReadBarSamples != nullptr);
if (Format != SampleProfileFormat::SPF_Compact_Binary) {
ASSERT_EQ("_Z3bari", ReadBarSamples->getName());
}
ASSERT_EQ(20301u, ReadBarSamples->getTotalSamples());
ASSERT_EQ(1437u, ReadBarSamples->getHeadSamples());
ErrorOr<SampleRecord::CallTargetMap> CTMap =
ReadBarSamples->findCallTargetMapAt(1, 0);
ASSERT_FALSE(CTMap.getError());
std::string MconstructGUID;
StringRef MconstructRep =
getRepInFormat(MconstructName, Format, MconstructGUID);
std::string StringviewGUID;
StringRef StringviewRep =
getRepInFormat(StringviewName, Format, StringviewGUID);
ASSERT_EQ(1000u, CTMap.get()[MconstructRep]);
ASSERT_EQ(437u, CTMap.get()[StringviewRep]);
auto VerifySummary = [](ProfileSummary &Summary) mutable {
ASSERT_EQ(ProfileSummary::PSK_Sample, Summary.getKind());
ASSERT_EQ(123603u, Summary.getTotalCount());
ASSERT_EQ(6u, Summary.getNumCounts());
ASSERT_EQ(2u, Summary.getNumFunctions());
ASSERT_EQ(1437u, Summary.getMaxFunctionCount());
ASSERT_EQ(60351u, Summary.getMaxCount());
uint32_t Cutoff = 800000;
auto Predicate = [&Cutoff](const ProfileSummaryEntry &PE) {
return PE.Cutoff == Cutoff;
};
std::vector<ProfileSummaryEntry> &Details = Summary.getDetailedSummary();
auto EightyPerc = find_if(Details, Predicate);
Cutoff = 900000;
auto NinetyPerc = find_if(Details, Predicate);
Cutoff = 950000;
auto NinetyFivePerc = find_if(Details, Predicate);
Cutoff = 990000;
auto NinetyNinePerc = find_if(Details, Predicate);
ASSERT_EQ(60000u, EightyPerc->MinCount);
ASSERT_EQ(60000u, NinetyPerc->MinCount);
ASSERT_EQ(60000u, NinetyFivePerc->MinCount);
ASSERT_EQ(610u, NinetyNinePerc->MinCount);
};
ProfileSummary &Summary = Reader->getSummary();
VerifySummary(Summary);
// Test that conversion of summary to and from Metadata works.
Metadata *MD = Summary.getMD(Context);
ASSERT_TRUE(MD);
ProfileSummary *PS = ProfileSummary::getFromMD(MD);
ASSERT_TRUE(PS);
VerifySummary(*PS);
delete PS;
// Test that summary can be attached to and read back from module.
M.setProfileSummary(MD, ProfileSummary::PSK_Sample);
MD = M.getProfileSummary(/* IsCS */ false);
ASSERT_TRUE(MD);
PS = ProfileSummary::getFromMD(MD);
ASSERT_TRUE(PS);
VerifySummary(*PS);
delete PS;
}
void addFunctionSamples(StringMap<FunctionSamples> *Smap, const char *Fname,
uint64_t TotalSamples, uint64_t HeadSamples) {
StringRef Name(Fname);
FunctionSamples FcnSamples;
FcnSamples.setName(Name);
FcnSamples.addTotalSamples(TotalSamples);
FcnSamples.addHeadSamples(HeadSamples);
FcnSamples.addBodySamples(1, 0, HeadSamples);
(*Smap)[Name] = FcnSamples;
}
StringMap<FunctionSamples> setupFcnSamplesForElisionTest(StringRef Policy) {
StringMap<FunctionSamples> Smap;
addFunctionSamples(&Smap, "foo", uint64_t(20301), uint64_t(1437));
if (Policy == "" || Policy == "all")
return Smap;
addFunctionSamples(&Smap, "foo.bar", uint64_t(20303), uint64_t(1439));
if (Policy == "selected")
return Smap;
addFunctionSamples(&Smap, "foo.llvm.2465", uint64_t(20305), uint64_t(1441));
return Smap;
}
void createFunctionWithSampleProfileElisionPolicy(Module *M,
const char *Fname,
StringRef Policy) {
FunctionType *FnType =
FunctionType::get(Type::getVoidTy(Context), {}, false);
auto Inserted = M->getOrInsertFunction(Fname, FnType);
auto Fcn = cast<Function>(Inserted.getCallee());
if (Policy != "")
Fcn->addFnAttr("sample-profile-suffix-elision-policy", Policy);
}
void setupModuleForElisionTest(Module *M, StringRef Policy) {
createFunctionWithSampleProfileElisionPolicy(M, "foo", Policy);
createFunctionWithSampleProfileElisionPolicy(M, "foo.bar", Policy);
createFunctionWithSampleProfileElisionPolicy(M, "foo.llvm.2465", Policy);
}
void testSuffixElisionPolicy(SampleProfileFormat Format, StringRef Policy,
const StringMap<uint64_t> &Expected) {
SmallVector<char, 128> ProfilePath;
std::error_code EC;
EC = llvm::sys::fs::createTemporaryFile("profile", "", ProfilePath);
ASSERT_TRUE(NoError(EC));
StringRef ProfileFile(ProfilePath.data(), ProfilePath.size());
Module M("my_module", Context);
setupModuleForElisionTest(&M, Policy);
StringMap<FunctionSamples> ProfMap = setupFcnSamplesForElisionTest(Policy);
// write profile
createWriter(Format, ProfileFile);
EC = Writer->write(ProfMap);
ASSERT_TRUE(NoError(EC));
Writer->getOutputStream().flush();
// read profile
readProfile(M, ProfileFile);
EC = Reader->read();
ASSERT_TRUE(NoError(EC));
for (auto I = Expected.begin(); I != Expected.end(); ++I) {
uint64_t Esamples = uint64_t(-1);
FunctionSamples *Samples = Reader->getSamplesFor(I->getKey());
if (Samples != nullptr)
Esamples = Samples->getTotalSamples();
ASSERT_EQ(I->getValue(), Esamples);
}
}
};
TEST_F(SampleProfTest, roundtrip_text_profile) {
testRoundTrip(SampleProfileFormat::SPF_Text, false);
}
TEST_F(SampleProfTest, roundtrip_raw_binary_profile) {
testRoundTrip(SampleProfileFormat::SPF_Binary, false);
}
TEST_F(SampleProfTest, roundtrip_compact_binary_profile) {
testRoundTrip(SampleProfileFormat::SPF_Compact_Binary, false);
}
TEST_F(SampleProfTest, roundtrip_ext_binary_profile) {
testRoundTrip(SampleProfileFormat::SPF_Ext_Binary, false);
}
TEST_F(SampleProfTest, remap_text_profile) {
testRoundTrip(SampleProfileFormat::SPF_Text, true);
}
TEST_F(SampleProfTest, remap_raw_binary_profile) {
testRoundTrip(SampleProfileFormat::SPF_Binary, true);
}
TEST_F(SampleProfTest, remap_ext_binary_profile) {
testRoundTrip(SampleProfileFormat::SPF_Ext_Binary, true);
}
TEST_F(SampleProfTest, sample_overflow_saturation) {
const uint64_t Max = std::numeric_limits<uint64_t>::max();
sampleprof_error Result;
FunctionSamples FooSamples;
Result = FooSamples.addTotalSamples(1);
ASSERT_EQ(Result, sampleprof_error::success);
Result = FooSamples.addHeadSamples(1);
ASSERT_EQ(Result, sampleprof_error::success);
Result = FooSamples.addBodySamples(10, 0, 1);
ASSERT_EQ(Result, sampleprof_error::success);
Result = FooSamples.addTotalSamples(Max);
ASSERT_EQ(Result, sampleprof_error::counter_overflow);
ASSERT_EQ(FooSamples.getTotalSamples(), Max);
Result = FooSamples.addHeadSamples(Max);
ASSERT_EQ(Result, sampleprof_error::counter_overflow);
ASSERT_EQ(FooSamples.getHeadSamples(), Max);
Result = FooSamples.addBodySamples(10, 0, Max);
ASSERT_EQ(Result, sampleprof_error::counter_overflow);
ErrorOr<uint64_t> BodySamples = FooSamples.findSamplesAt(10, 0);
ASSERT_FALSE(BodySamples.getError());
ASSERT_EQ(BodySamples.get(), Max);
}
TEST_F(SampleProfTest, default_suffix_elision_text) {
// Default suffix elision policy: strip everything after first dot.
// This implies that all suffix variants will map to "foo", so
// we don't expect to see any entries for them in the sample
// profile.
StringMap<uint64_t> Expected;
Expected["foo"] = uint64_t(20301);
Expected["foo.bar"] = uint64_t(-1);
Expected["foo.llvm.2465"] = uint64_t(-1);
testSuffixElisionPolicy(SampleProfileFormat::SPF_Text, "", Expected);
}
TEST_F(SampleProfTest, default_suffix_elision_compact_binary) {
// Default suffix elision policy: strip everything after first dot.
// This implies that all suffix variants will map to "foo", so
// we don't expect to see any entries for them in the sample
// profile.
StringMap<uint64_t> Expected;
Expected["foo"] = uint64_t(20301);
Expected["foo.bar"] = uint64_t(-1);
Expected["foo.llvm.2465"] = uint64_t(-1);
testSuffixElisionPolicy(SampleProfileFormat::SPF_Compact_Binary, "",
Expected);
}
TEST_F(SampleProfTest, selected_suffix_elision_text) {
// Profile is created and searched using the "selected"
// suffix elision policy: we only strip a .XXX suffix if
// it matches a pattern known to be generated by the compiler
// (e.g. ".llvm.<digits>").
StringMap<uint64_t> Expected;
Expected["foo"] = uint64_t(20301);
Expected["foo.bar"] = uint64_t(20303);
Expected["foo.llvm.2465"] = uint64_t(-1);
testSuffixElisionPolicy(SampleProfileFormat::SPF_Text, "selected", Expected);
}
TEST_F(SampleProfTest, selected_suffix_elision_compact_binary) {
// Profile is created and searched using the "selected"
// suffix elision policy: we only strip a .XXX suffix if
// it matches a pattern known to be generated by the compiler
// (e.g. ".llvm.<digits>").
StringMap<uint64_t> Expected;
Expected["foo"] = uint64_t(20301);
Expected["foo.bar"] = uint64_t(20303);
Expected["foo.llvm.2465"] = uint64_t(-1);
testSuffixElisionPolicy(SampleProfileFormat::SPF_Compact_Binary, "selected",
Expected);
}
TEST_F(SampleProfTest, none_suffix_elision_text) {
// Profile is created and searched using the "none"
// suffix elision policy: no stripping of suffixes at all.
// Here we expect to see all variants in the profile.
StringMap<uint64_t> Expected;
Expected["foo"] = uint64_t(20301);
Expected["foo.bar"] = uint64_t(20303);
Expected["foo.llvm.2465"] = uint64_t(20305);
testSuffixElisionPolicy(SampleProfileFormat::SPF_Text, "none", Expected);
}
TEST_F(SampleProfTest, none_suffix_elision_compact_binary) {
// Profile is created and searched using the "none"
// suffix elision policy: no stripping of suffixes at all.
// Here we expect to see all variants in the profile.
StringMap<uint64_t> Expected;
Expected["foo"] = uint64_t(20301);
Expected["foo.bar"] = uint64_t(20303);
Expected["foo.llvm.2465"] = uint64_t(20305);
testSuffixElisionPolicy(SampleProfileFormat::SPF_Compact_Binary, "none",
Expected);
}
} // end anonymous namespace
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