462 lines
18 KiB
C++
462 lines
18 KiB
C++
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//===- ProfileSummaryInfo.cpp - Global profile summary information --------===//
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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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// This file contains a pass that provides access to the global profile summary
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// information.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/ProfileSummaryInfo.h"
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#include "llvm/Analysis/BlockFrequencyInfo.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Metadata.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/ProfileSummary.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/ProfileData/ProfileCommon.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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// The following two parameters determine the threshold for a count to be
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// considered hot/cold. These two parameters are percentile values (multiplied
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// by 10000). If the counts are sorted in descending order, the minimum count to
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// reach ProfileSummaryCutoffHot gives the threshold to determine a hot count.
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// Similarly, the minimum count to reach ProfileSummaryCutoffCold gives the
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// threshold for determining cold count (everything <= this threshold is
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// considered cold).
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static cl::opt<int> ProfileSummaryCutoffHot(
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"profile-summary-cutoff-hot", cl::Hidden, cl::init(990000), cl::ZeroOrMore,
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cl::desc("A count is hot if it exceeds the minimum count to"
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" reach this percentile of total counts."));
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static cl::opt<int> ProfileSummaryCutoffCold(
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"profile-summary-cutoff-cold", cl::Hidden, cl::init(999999), cl::ZeroOrMore,
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cl::desc("A count is cold if it is below the minimum count"
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" to reach this percentile of total counts."));
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static cl::opt<unsigned> ProfileSummaryHugeWorkingSetSizeThreshold(
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"profile-summary-huge-working-set-size-threshold", cl::Hidden,
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cl::init(15000), cl::ZeroOrMore,
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cl::desc("The code working set size is considered huge if the number of"
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" blocks required to reach the -profile-summary-cutoff-hot"
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" percentile exceeds this count."));
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static cl::opt<unsigned> ProfileSummaryLargeWorkingSetSizeThreshold(
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"profile-summary-large-working-set-size-threshold", cl::Hidden,
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cl::init(12500), cl::ZeroOrMore,
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cl::desc("The code working set size is considered large if the number of"
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" blocks required to reach the -profile-summary-cutoff-hot"
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" percentile exceeds this count."));
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// The next two options override the counts derived from summary computation and
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// are useful for debugging purposes.
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static cl::opt<int> ProfileSummaryHotCount(
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"profile-summary-hot-count", cl::ReallyHidden, cl::ZeroOrMore,
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cl::desc("A fixed hot count that overrides the count derived from"
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" profile-summary-cutoff-hot"));
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static cl::opt<int> ProfileSummaryColdCount(
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"profile-summary-cold-count", cl::ReallyHidden, cl::ZeroOrMore,
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cl::desc("A fixed cold count that overrides the count derived from"
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" profile-summary-cutoff-cold"));
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static cl::opt<bool> PartialProfile(
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"partial-profile", cl::Hidden, cl::init(false),
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cl::desc("Specify the current profile is used as a partial profile."));
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cl::opt<bool> ScalePartialSampleProfileWorkingSetSize(
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"scale-partial-sample-profile-working-set-size", cl::Hidden, cl::init(true),
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cl::desc(
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"If true, scale the working set size of the partial sample profile "
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"by the partial profile ratio to reflect the size of the program "
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"being compiled."));
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static cl::opt<double> PartialSampleProfileWorkingSetSizeScaleFactor(
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"partial-sample-profile-working-set-size-scale-factor", cl::Hidden,
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cl::init(0.008),
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cl::desc("The scale factor used to scale the working set size of the "
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"partial sample profile along with the partial profile ratio. "
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"This includes the factor of the profile counter per block "
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"and the factor to scale the working set size to use the same "
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"shared thresholds as PGO."));
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// The profile summary metadata may be attached either by the frontend or by
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// any backend passes (IR level instrumentation, for example). This method
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// checks if the Summary is null and if so checks if the summary metadata is now
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// available in the module and parses it to get the Summary object.
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void ProfileSummaryInfo::refresh() {
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if (hasProfileSummary())
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return;
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// First try to get context sensitive ProfileSummary.
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auto *SummaryMD = M.getProfileSummary(/* IsCS */ true);
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if (SummaryMD)
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Summary.reset(ProfileSummary::getFromMD(SummaryMD));
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if (!hasProfileSummary()) {
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// This will actually return PSK_Instr or PSK_Sample summary.
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SummaryMD = M.getProfileSummary(/* IsCS */ false);
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if (SummaryMD)
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Summary.reset(ProfileSummary::getFromMD(SummaryMD));
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}
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if (!hasProfileSummary())
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return;
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computeThresholds();
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}
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Optional<uint64_t> ProfileSummaryInfo::getProfileCount(
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const CallBase &Call, BlockFrequencyInfo *BFI, bool AllowSynthetic) const {
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assert((isa<CallInst>(Call) || isa<InvokeInst>(Call)) &&
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"We can only get profile count for call/invoke instruction.");
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if (hasSampleProfile()) {
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// In sample PGO mode, check if there is a profile metadata on the
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// instruction. If it is present, determine hotness solely based on that,
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// since the sampled entry count may not be accurate. If there is no
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// annotated on the instruction, return None.
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uint64_t TotalCount;
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if (Call.extractProfTotalWeight(TotalCount))
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return TotalCount;
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return None;
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}
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if (BFI)
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return BFI->getBlockProfileCount(Call.getParent(), AllowSynthetic);
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return None;
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}
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/// Returns true if the function's entry is hot. If it returns false, it
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/// either means it is not hot or it is unknown whether it is hot or not (for
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/// example, no profile data is available).
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bool ProfileSummaryInfo::isFunctionEntryHot(const Function *F) const {
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if (!F || !hasProfileSummary())
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return false;
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auto FunctionCount = F->getEntryCount();
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// FIXME: The heuristic used below for determining hotness is based on
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// preliminary SPEC tuning for inliner. This will eventually be a
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// convenience method that calls isHotCount.
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return FunctionCount && isHotCount(FunctionCount.getCount());
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}
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/// Returns true if the function contains hot code. This can include a hot
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/// function entry count, hot basic block, or (in the case of Sample PGO)
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/// hot total call edge count.
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/// If it returns false, it either means it is not hot or it is unknown
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/// (for example, no profile data is available).
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bool ProfileSummaryInfo::isFunctionHotInCallGraph(
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const Function *F, BlockFrequencyInfo &BFI) const {
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if (!F || !hasProfileSummary())
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return false;
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if (auto FunctionCount = F->getEntryCount())
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if (isHotCount(FunctionCount.getCount()))
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return true;
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if (hasSampleProfile()) {
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uint64_t TotalCallCount = 0;
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for (const auto &BB : *F)
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for (const auto &I : BB)
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if (isa<CallInst>(I) || isa<InvokeInst>(I))
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if (auto CallCount = getProfileCount(cast<CallBase>(I), nullptr))
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TotalCallCount += CallCount.getValue();
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if (isHotCount(TotalCallCount))
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return true;
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}
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for (const auto &BB : *F)
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if (isHotBlock(&BB, &BFI))
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return true;
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return false;
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}
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/// Returns true if the function only contains cold code. This means that
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/// the function entry and blocks are all cold, and (in the case of Sample PGO)
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/// the total call edge count is cold.
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/// If it returns false, it either means it is not cold or it is unknown
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/// (for example, no profile data is available).
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bool ProfileSummaryInfo::isFunctionColdInCallGraph(
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const Function *F, BlockFrequencyInfo &BFI) const {
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if (!F || !hasProfileSummary())
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return false;
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if (auto FunctionCount = F->getEntryCount())
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if (!isColdCount(FunctionCount.getCount()))
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return false;
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if (hasSampleProfile()) {
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uint64_t TotalCallCount = 0;
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for (const auto &BB : *F)
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for (const auto &I : BB)
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if (isa<CallInst>(I) || isa<InvokeInst>(I))
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if (auto CallCount = getProfileCount(cast<CallBase>(I), nullptr))
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TotalCallCount += CallCount.getValue();
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if (!isColdCount(TotalCallCount))
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return false;
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}
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for (const auto &BB : *F)
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if (!isColdBlock(&BB, &BFI))
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return false;
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return true;
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}
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bool ProfileSummaryInfo::isFunctionHotnessUnknown(const Function &F) const {
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assert(hasPartialSampleProfile() && "Expect partial sample profile");
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return !F.getEntryCount().hasValue();
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}
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template <bool isHot>
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bool ProfileSummaryInfo::isFunctionHotOrColdInCallGraphNthPercentile(
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int PercentileCutoff, const Function *F, BlockFrequencyInfo &BFI) const {
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if (!F || !hasProfileSummary())
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return false;
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if (auto FunctionCount = F->getEntryCount()) {
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if (isHot &&
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isHotCountNthPercentile(PercentileCutoff, FunctionCount.getCount()))
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return true;
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if (!isHot &&
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!isColdCountNthPercentile(PercentileCutoff, FunctionCount.getCount()))
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return false;
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}
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if (hasSampleProfile()) {
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uint64_t TotalCallCount = 0;
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for (const auto &BB : *F)
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for (const auto &I : BB)
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if (isa<CallInst>(I) || isa<InvokeInst>(I))
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if (auto CallCount = getProfileCount(cast<CallBase>(I), nullptr))
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TotalCallCount += CallCount.getValue();
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if (isHot && isHotCountNthPercentile(PercentileCutoff, TotalCallCount))
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return true;
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if (!isHot && !isColdCountNthPercentile(PercentileCutoff, TotalCallCount))
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return false;
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}
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for (const auto &BB : *F) {
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if (isHot && isHotBlockNthPercentile(PercentileCutoff, &BB, &BFI))
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return true;
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if (!isHot && !isColdBlockNthPercentile(PercentileCutoff, &BB, &BFI))
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return false;
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}
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return !isHot;
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}
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// Like isFunctionHotInCallGraph but for a given cutoff.
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bool ProfileSummaryInfo::isFunctionHotInCallGraphNthPercentile(
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int PercentileCutoff, const Function *F, BlockFrequencyInfo &BFI) const {
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return isFunctionHotOrColdInCallGraphNthPercentile<true>(
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PercentileCutoff, F, BFI);
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}
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bool ProfileSummaryInfo::isFunctionColdInCallGraphNthPercentile(
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int PercentileCutoff, const Function *F, BlockFrequencyInfo &BFI) const {
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return isFunctionHotOrColdInCallGraphNthPercentile<false>(
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PercentileCutoff, F, BFI);
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}
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/// Returns true if the function's entry is a cold. If it returns false, it
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/// either means it is not cold or it is unknown whether it is cold or not (for
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/// example, no profile data is available).
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bool ProfileSummaryInfo::isFunctionEntryCold(const Function *F) const {
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if (!F)
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return false;
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if (F->hasFnAttribute(Attribute::Cold))
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return true;
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if (!hasProfileSummary())
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return false;
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auto FunctionCount = F->getEntryCount();
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// FIXME: The heuristic used below for determining coldness is based on
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// preliminary SPEC tuning for inliner. This will eventually be a
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// convenience method that calls isHotCount.
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return FunctionCount && isColdCount(FunctionCount.getCount());
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}
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/// Compute the hot and cold thresholds.
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void ProfileSummaryInfo::computeThresholds() {
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auto &DetailedSummary = Summary->getDetailedSummary();
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auto &HotEntry = ProfileSummaryBuilder::getEntryForPercentile(
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DetailedSummary, ProfileSummaryCutoffHot);
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HotCountThreshold = HotEntry.MinCount;
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if (ProfileSummaryHotCount.getNumOccurrences() > 0)
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HotCountThreshold = ProfileSummaryHotCount;
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auto &ColdEntry = ProfileSummaryBuilder::getEntryForPercentile(
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DetailedSummary, ProfileSummaryCutoffCold);
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ColdCountThreshold = ColdEntry.MinCount;
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if (ProfileSummaryColdCount.getNumOccurrences() > 0)
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ColdCountThreshold = ProfileSummaryColdCount;
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assert(ColdCountThreshold <= HotCountThreshold &&
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"Cold count threshold cannot exceed hot count threshold!");
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if (!hasPartialSampleProfile() || !ScalePartialSampleProfileWorkingSetSize) {
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HasHugeWorkingSetSize =
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HotEntry.NumCounts > ProfileSummaryHugeWorkingSetSizeThreshold;
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HasLargeWorkingSetSize =
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HotEntry.NumCounts > ProfileSummaryLargeWorkingSetSizeThreshold;
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} else {
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// Scale the working set size of the partial sample profile to reflect the
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// size of the program being compiled.
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double PartialProfileRatio = Summary->getPartialProfileRatio();
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uint64_t ScaledHotEntryNumCounts =
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static_cast<uint64_t>(HotEntry.NumCounts * PartialProfileRatio *
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PartialSampleProfileWorkingSetSizeScaleFactor);
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HasHugeWorkingSetSize =
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ScaledHotEntryNumCounts > ProfileSummaryHugeWorkingSetSizeThreshold;
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HasLargeWorkingSetSize =
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ScaledHotEntryNumCounts > ProfileSummaryLargeWorkingSetSizeThreshold;
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}
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}
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Optional<uint64_t>
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ProfileSummaryInfo::computeThreshold(int PercentileCutoff) const {
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if (!hasProfileSummary())
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return None;
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auto iter = ThresholdCache.find(PercentileCutoff);
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if (iter != ThresholdCache.end()) {
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return iter->second;
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}
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auto &DetailedSummary = Summary->getDetailedSummary();
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auto &Entry = ProfileSummaryBuilder::getEntryForPercentile(DetailedSummary,
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PercentileCutoff);
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uint64_t CountThreshold = Entry.MinCount;
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ThresholdCache[PercentileCutoff] = CountThreshold;
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return CountThreshold;
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}
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bool ProfileSummaryInfo::hasHugeWorkingSetSize() const {
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return HasHugeWorkingSetSize && HasHugeWorkingSetSize.getValue();
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}
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bool ProfileSummaryInfo::hasLargeWorkingSetSize() const {
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return HasLargeWorkingSetSize && HasLargeWorkingSetSize.getValue();
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}
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bool ProfileSummaryInfo::isHotCount(uint64_t C) const {
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return HotCountThreshold && C >= HotCountThreshold.getValue();
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}
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bool ProfileSummaryInfo::isColdCount(uint64_t C) const {
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return ColdCountThreshold && C <= ColdCountThreshold.getValue();
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}
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template <bool isHot>
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bool ProfileSummaryInfo::isHotOrColdCountNthPercentile(int PercentileCutoff,
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uint64_t C) const {
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auto CountThreshold = computeThreshold(PercentileCutoff);
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if (isHot)
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return CountThreshold && C >= CountThreshold.getValue();
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else
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return CountThreshold && C <= CountThreshold.getValue();
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}
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||
|
|
|
||
|
|
bool ProfileSummaryInfo::isHotCountNthPercentile(int PercentileCutoff,
|
||
|
|
uint64_t C) const {
|
||
|
|
return isHotOrColdCountNthPercentile<true>(PercentileCutoff, C);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ProfileSummaryInfo::isColdCountNthPercentile(int PercentileCutoff,
|
||
|
|
uint64_t C) const {
|
||
|
|
return isHotOrColdCountNthPercentile<false>(PercentileCutoff, C);
|
||
|
|
}
|
||
|
|
|
||
|
|
uint64_t ProfileSummaryInfo::getOrCompHotCountThreshold() const {
|
||
|
|
return HotCountThreshold ? HotCountThreshold.getValue() : UINT64_MAX;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint64_t ProfileSummaryInfo::getOrCompColdCountThreshold() const {
|
||
|
|
return ColdCountThreshold ? ColdCountThreshold.getValue() : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ProfileSummaryInfo::isHotBlock(const BasicBlock *BB,
|
||
|
|
BlockFrequencyInfo *BFI) const {
|
||
|
|
auto Count = BFI->getBlockProfileCount(BB);
|
||
|
|
return Count && isHotCount(*Count);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ProfileSummaryInfo::isColdBlock(const BasicBlock *BB,
|
||
|
|
BlockFrequencyInfo *BFI) const {
|
||
|
|
auto Count = BFI->getBlockProfileCount(BB);
|
||
|
|
return Count && isColdCount(*Count);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <bool isHot>
|
||
|
|
bool ProfileSummaryInfo::isHotOrColdBlockNthPercentile(
|
||
|
|
int PercentileCutoff, const BasicBlock *BB, BlockFrequencyInfo *BFI) const {
|
||
|
|
auto Count = BFI->getBlockProfileCount(BB);
|
||
|
|
if (isHot)
|
||
|
|
return Count && isHotCountNthPercentile(PercentileCutoff, *Count);
|
||
|
|
else
|
||
|
|
return Count && isColdCountNthPercentile(PercentileCutoff, *Count);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ProfileSummaryInfo::isHotBlockNthPercentile(
|
||
|
|
int PercentileCutoff, const BasicBlock *BB, BlockFrequencyInfo *BFI) const {
|
||
|
|
return isHotOrColdBlockNthPercentile<true>(PercentileCutoff, BB, BFI);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ProfileSummaryInfo::isColdBlockNthPercentile(
|
||
|
|
int PercentileCutoff, const BasicBlock *BB, BlockFrequencyInfo *BFI) const {
|
||
|
|
return isHotOrColdBlockNthPercentile<false>(PercentileCutoff, BB, BFI);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ProfileSummaryInfo::isHotCallSite(const CallBase &CB,
|
||
|
|
BlockFrequencyInfo *BFI) const {
|
||
|
|
auto C = getProfileCount(CB, BFI);
|
||
|
|
return C && isHotCount(*C);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ProfileSummaryInfo::isColdCallSite(const CallBase &CB,
|
||
|
|
BlockFrequencyInfo *BFI) const {
|
||
|
|
auto C = getProfileCount(CB, BFI);
|
||
|
|
if (C)
|
||
|
|
return isColdCount(*C);
|
||
|
|
|
||
|
|
// In SamplePGO, if the caller has been sampled, and there is no profile
|
||
|
|
// annotated on the callsite, we consider the callsite as cold.
|
||
|
|
return hasSampleProfile() && CB.getCaller()->hasProfileData();
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ProfileSummaryInfo::hasPartialSampleProfile() const {
|
||
|
|
return hasProfileSummary() &&
|
||
|
|
Summary->getKind() == ProfileSummary::PSK_Sample &&
|
||
|
|
(PartialProfile || Summary->isPartialProfile());
|
||
|
|
}
|
||
|
|
|
||
|
|
INITIALIZE_PASS(ProfileSummaryInfoWrapperPass, "profile-summary-info",
|
||
|
|
"Profile summary info", false, true)
|
||
|
|
|
||
|
|
ProfileSummaryInfoWrapperPass::ProfileSummaryInfoWrapperPass()
|
||
|
|
: ImmutablePass(ID) {
|
||
|
|
initializeProfileSummaryInfoWrapperPassPass(*PassRegistry::getPassRegistry());
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ProfileSummaryInfoWrapperPass::doInitialization(Module &M) {
|
||
|
|
PSI.reset(new ProfileSummaryInfo(M));
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ProfileSummaryInfoWrapperPass::doFinalization(Module &M) {
|
||
|
|
PSI.reset();
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
AnalysisKey ProfileSummaryAnalysis::Key;
|
||
|
|
ProfileSummaryInfo ProfileSummaryAnalysis::run(Module &M,
|
||
|
|
ModuleAnalysisManager &) {
|
||
|
|
return ProfileSummaryInfo(M);
|
||
|
|
}
|
||
|
|
|
||
|
|
PreservedAnalyses ProfileSummaryPrinterPass::run(Module &M,
|
||
|
|
ModuleAnalysisManager &AM) {
|
||
|
|
ProfileSummaryInfo &PSI = AM.getResult<ProfileSummaryAnalysis>(M);
|
||
|
|
|
||
|
|
OS << "Functions in " << M.getName() << " with hot/cold annotations: \n";
|
||
|
|
for (auto &F : M) {
|
||
|
|
OS << F.getName();
|
||
|
|
if (PSI.isFunctionEntryHot(&F))
|
||
|
|
OS << " :hot entry ";
|
||
|
|
else if (PSI.isFunctionEntryCold(&F))
|
||
|
|
OS << " :cold entry ";
|
||
|
|
OS << "\n";
|
||
|
|
}
|
||
|
|
return PreservedAnalyses::all();
|
||
|
|
}
|
||
|
|
|
||
|
|
char ProfileSummaryInfoWrapperPass::ID = 0;
|