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llvm-mirror/tools/llvm-xray/xray-account.cc
Dean Michael Berris c91cd5f47b [XRay] Define the InstrumentationMap type 
Summary:
This change implements the instrumentation map loading library which can
understand both YAML-defined instrumentation maps, and ELF 64-bit object
files that have the XRay instrumentation map section. We break it out
into a library on its own to allow for other applications to deal with
the XRay instrumentation map defined in XRay-instrumented binaries.

This type provides both raw access to the logical representation of the
instrumentation map entries as well as higher level functions for
converting a function ID into a function address.

At this point we only support ELF64 binaries and YAML-defined XRay
instrumentation maps. Future changes should extend this to support
32-bit ELF binaries, as well as other binary formats (like MachO).

As part of this change we also migrate all uses of the extraction logic
that used to be defined in tools/llvm-xray/ to use this new type and
interface for loading from files. We also remove the flag from the
`llvm-xray` tool that required users to specify the type of the
instrumentation map file being provided to instead make the library
auto-detect the file type.

Reviewers: dblaikie

Subscribers: mgorny, varno, llvm-commits

Differential Revision: https://reviews.llvm.org/D29319

llvm-svn: 293721
2017-02-01 00:05:29 +00:00

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//===- xray-account.h - XRay Function Call Accounting ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements basic function call accounting from an XRay trace.
//
//===----------------------------------------------------------------------===//
#include <algorithm>
#include <cassert>
#include <numeric>
#include <system_error>
#include <utility>
#include "xray-account.h"
#include "xray-registry.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/XRay/InstrumentationMap.h"
#include "llvm/XRay/Trace.h"
using namespace llvm;
using namespace llvm::xray;
static cl::SubCommand Account("account", "Function call accounting");
static cl::opt<std::string> AccountInput(cl::Positional,
cl::desc("<xray log file>"),
cl::Required, cl::sub(Account));
static cl::opt<bool>
AccountKeepGoing("keep-going", cl::desc("Keep going on errors encountered"),
cl::sub(Account), cl::init(false));
static cl::alias AccountKeepGoing2("k", cl::aliasopt(AccountKeepGoing),
cl::desc("Alias for -keep_going"),
cl::sub(Account));
static cl::opt<bool> AccountDeduceSiblingCalls(
"deduce-sibling-calls",
cl::desc("Deduce sibling calls when unrolling function call stacks"),
cl::sub(Account), cl::init(false));
static cl::alias
AccountDeduceSiblingCalls2("d", cl::aliasopt(AccountDeduceSiblingCalls),
cl::desc("Alias for -deduce_sibling_calls"),
cl::sub(Account));
static cl::opt<std::string>
AccountOutput("output", cl::value_desc("output file"), cl::init("-"),
cl::desc("output file; use '-' for stdout"),
cl::sub(Account));
static cl::alias AccountOutput2("o", cl::aliasopt(AccountOutput),
cl::desc("Alias for -output"),
cl::sub(Account));
enum class AccountOutputFormats { TEXT, CSV };
static cl::opt<AccountOutputFormats>
AccountOutputFormat("format", cl::desc("output format"),
cl::values(clEnumValN(AccountOutputFormats::TEXT,
"text", "report stats in text"),
clEnumValN(AccountOutputFormats::CSV, "csv",
"report stats in csv")),
cl::sub(Account));
static cl::alias AccountOutputFormat2("f", cl::desc("Alias of -format"),
cl::aliasopt(AccountOutputFormat),
cl::sub(Account));
enum class SortField {
FUNCID,
COUNT,
MIN,
MED,
PCT90,
PCT99,
MAX,
SUM,
FUNC,
};
static cl::opt<SortField> AccountSortOutput(
"sort", cl::desc("sort output by this field"), cl::value_desc("field"),
cl::sub(Account), cl::init(SortField::FUNCID),
cl::values(clEnumValN(SortField::FUNCID, "funcid", "function id"),
clEnumValN(SortField::COUNT, "count", "funciton call counts"),
clEnumValN(SortField::MIN, "min", "minimum function durations"),
clEnumValN(SortField::MED, "med", "median function durations"),
clEnumValN(SortField::PCT90, "90p", "90th percentile durations"),
clEnumValN(SortField::PCT99, "99p", "99th percentile durations"),
clEnumValN(SortField::MAX, "max", "maximum function durations"),
clEnumValN(SortField::SUM, "sum", "sum of call durations"),
clEnumValN(SortField::FUNC, "func", "function names")));
static cl::alias AccountSortOutput2("s", cl::aliasopt(AccountSortOutput),
cl::desc("Alias for -sort"),
cl::sub(Account));
enum class SortDirection {
ASCENDING,
DESCENDING,
};
static cl::opt<SortDirection> AccountSortOrder(
"sortorder", cl::desc("sort ordering"), cl::init(SortDirection::ASCENDING),
cl::values(clEnumValN(SortDirection::ASCENDING, "asc", "ascending"),
clEnumValN(SortDirection::DESCENDING, "dsc", "descending")),
cl::sub(Account));
static cl::alias AccountSortOrder2("r", cl::aliasopt(AccountSortOrder),
cl::desc("Alias for -sortorder"),
cl::sub(Account));
static cl::opt<int> AccountTop("top", cl::desc("only show the top N results"),
cl::value_desc("N"), cl::sub(Account),
cl::init(-1));
static cl::alias AccountTop2("p", cl::desc("Alias for -top"),
cl::aliasopt(AccountTop), cl::sub(Account));
static cl::opt<std::string>
AccountInstrMap("instr_map",
cl::desc("binary with the instrumentation map, or "
"a separate instrumentation map"),
cl::value_desc("binary with xray_instr_map"),
cl::sub(Account), cl::init(""));
static cl::alias AccountInstrMap2("m", cl::aliasopt(AccountInstrMap),
cl::desc("Alias for -instr_map"),
cl::sub(Account));
namespace {
template <class T, class U> void setMinMax(std::pair<T, T> &MM, U &&V) {
if (MM.first == 0 || MM.second == 0)
MM = std::make_pair(std::forward<U>(V), std::forward<U>(V));
else
MM = std::make_pair(std::min(MM.first, V), std::max(MM.second, V));
}
template <class T> T diff(T L, T R) { return std::max(L, R) - std::min(L, R); }
} // namespace
bool LatencyAccountant::accountRecord(const XRayRecord &Record) {
setMinMax(PerThreadMinMaxTSC[Record.TId], Record.TSC);
setMinMax(PerCPUMinMaxTSC[Record.CPU], Record.TSC);
if (CurrentMaxTSC == 0)
CurrentMaxTSC = Record.TSC;
if (Record.TSC < CurrentMaxTSC)
return false;
auto &ThreadStack = PerThreadFunctionStack[Record.TId];
switch (Record.Type) {
case RecordTypes::ENTER: {
// Function Enter
ThreadStack.emplace_back(Record.FuncId, Record.TSC);
break;
}
case RecordTypes::EXIT: {
// Function Exit
if (ThreadStack.back().first == Record.FuncId) {
const auto &Top = ThreadStack.back();
recordLatency(Top.first, diff(Top.second, Record.TSC));
ThreadStack.pop_back();
break;
}
if (!DeduceSiblingCalls)
return false;
// Look for the parent up the stack.
auto Parent =
std::find_if(ThreadStack.rbegin(), ThreadStack.rend(),
[&](const std::pair<const int32_t, uint64_t> &E) {
return E.first == Record.FuncId;
});
if (Parent == ThreadStack.rend())
return false;
// Account time for this apparently sibling call exit up the stack.
// Considering the following case:
//
// f()
// g()
// h()
//
// We might only ever see the following entries:
//
// -> f()
// -> g()
// -> h()
// <- h()
// <- f()
//
// Now we don't see the exit to g() because some older version of the XRay
// runtime wasn't instrumenting tail exits. If we don't deduce tail calls,
// we may potentially never account time for g() -- and this code would have
// already bailed out, because `<- f()` doesn't match the current "top" of
// stack where we're waiting for the exit to `g()` instead. This is not
// ideal and brittle -- so instead we provide a potentially inaccurate
// accounting of g() instead, computing it from the exit of f().
//
// While it might be better that we account the time between `-> g()` and
// `-> h()` as the proper accounting of time for g() here, this introduces
// complexity to do correctly (need to backtrack, etc.).
//
// FIXME: Potentially implement the more complex deduction algorithm?
auto I = std::next(Parent).base();
for (auto &E : make_range(I, ThreadStack.end())) {
recordLatency(E.first, diff(E.second, Record.TSC));
}
ThreadStack.erase(I, ThreadStack.end());
break;
}
}
return true;
}
namespace {
// We consolidate the data into a struct which we can output in various forms.
struct ResultRow {
uint64_t Count;
double Min;
double Median;
double Pct90;
double Pct99;
double Max;
double Sum;
std::string DebugInfo;
std::string Function;
};
ResultRow getStats(std::vector<uint64_t> &Timings) {
assert(!Timings.empty());
ResultRow R;
R.Sum = std::accumulate(Timings.begin(), Timings.end(), 0.0);
auto MinMax = std::minmax_element(Timings.begin(), Timings.end());
R.Min = *MinMax.first;
R.Max = *MinMax.second;
auto MedianOff = Timings.size() / 2;
std::nth_element(Timings.begin(), Timings.begin() + MedianOff, Timings.end());
R.Median = Timings[MedianOff];
auto Pct90Off = std::floor(Timings.size() * 0.9);
std::nth_element(Timings.begin(), Timings.begin() + Pct90Off, Timings.end());
R.Pct90 = Timings[Pct90Off];
auto Pct99Off = std::floor(Timings.size() * 0.99);
std::nth_element(Timings.begin(), Timings.begin() + Pct90Off, Timings.end());
R.Pct99 = Timings[Pct99Off];
R.Count = Timings.size();
return R;
}
} // namespace
template <class F>
void LatencyAccountant::exportStats(const XRayFileHeader &Header, F Fn) const {
using TupleType = std::tuple<int32_t, uint64_t, ResultRow>;
std::vector<TupleType> Results;
Results.reserve(FunctionLatencies.size());
for (auto FT : FunctionLatencies) {
const auto &FuncId = FT.first;
auto &Timings = FT.second;
Results.emplace_back(FuncId, Timings.size(), getStats(Timings));
auto &Row = std::get<2>(Results.back());
if (Header.CycleFrequency) {
double CycleFrequency = Header.CycleFrequency;
Row.Min /= CycleFrequency;
Row.Median /= CycleFrequency;
Row.Pct90 /= CycleFrequency;
Row.Pct99 /= CycleFrequency;
Row.Max /= CycleFrequency;
Row.Sum /= CycleFrequency;
}
Row.Function = FuncIdHelper.SymbolOrNumber(FuncId);
Row.DebugInfo = FuncIdHelper.FileLineAndColumn(FuncId);
}
// Sort the data according to user-provided flags.
switch (AccountSortOutput) {
case SortField::FUNCID:
std::sort(Results.begin(), Results.end(),
[](const TupleType &L, const TupleType &R) {
if (AccountSortOrder == SortDirection::ASCENDING)
return std::get<0>(L) < std::get<0>(R);
if (AccountSortOrder == SortDirection::DESCENDING)
return std::get<0>(L) > std::get<0>(R);
llvm_unreachable("Unknown sort direction");
});
break;
case SortField::COUNT:
std::sort(Results.begin(), Results.end(),
[](const TupleType &L, const TupleType &R) {
if (AccountSortOrder == SortDirection::ASCENDING)
return std::get<1>(L) < std::get<1>(R);
if (AccountSortOrder == SortDirection::DESCENDING)
return std::get<1>(L) > std::get<1>(R);
llvm_unreachable("Unknown sort direction");
});
break;
default:
// Here we need to look into the ResultRow for the rest of the data that
// we want to sort by.
std::sort(Results.begin(), Results.end(),
[&](const TupleType &L, const TupleType &R) {
auto &LR = std::get<2>(L);
auto &RR = std::get<2>(R);
switch (AccountSortOutput) {
case SortField::COUNT:
if (AccountSortOrder == SortDirection::ASCENDING)
return LR.Count < RR.Count;
if (AccountSortOrder == SortDirection::DESCENDING)
return LR.Count > RR.Count;
llvm_unreachable("Unknown sort direction");
case SortField::MIN:
if (AccountSortOrder == SortDirection::ASCENDING)
return LR.Min < RR.Min;
if (AccountSortOrder == SortDirection::DESCENDING)
return LR.Min > RR.Min;
llvm_unreachable("Unknown sort direction");
case SortField::MED:
if (AccountSortOrder == SortDirection::ASCENDING)
return LR.Median < RR.Median;
if (AccountSortOrder == SortDirection::DESCENDING)
return LR.Median > RR.Median;
llvm_unreachable("Unknown sort direction");
case SortField::PCT90:
if (AccountSortOrder == SortDirection::ASCENDING)
return LR.Pct90 < RR.Pct90;
if (AccountSortOrder == SortDirection::DESCENDING)
return LR.Pct90 > RR.Pct90;
llvm_unreachable("Unknown sort direction");
case SortField::PCT99:
if (AccountSortOrder == SortDirection::ASCENDING)
return LR.Pct99 < RR.Pct99;
if (AccountSortOrder == SortDirection::DESCENDING)
return LR.Pct99 > RR.Pct99;
llvm_unreachable("Unknown sort direction");
case SortField::MAX:
if (AccountSortOrder == SortDirection::ASCENDING)
return LR.Max < RR.Max;
if (AccountSortOrder == SortDirection::DESCENDING)
return LR.Max > RR.Max;
llvm_unreachable("Unknown sort direction");
case SortField::SUM:
if (AccountSortOrder == SortDirection::ASCENDING)
return LR.Sum < RR.Sum;
if (AccountSortOrder == SortDirection::DESCENDING)
return LR.Sum > RR.Sum;
llvm_unreachable("Unknown sort direction");
default:
llvm_unreachable("Unsupported sort order");
}
});
break;
}
if (AccountTop > 0)
Results.erase(Results.begin() + AccountTop.getValue(), Results.end());
for (const auto &R : Results)
Fn(std::get<0>(R), std::get<1>(R), std::get<2>(R));
}
void LatencyAccountant::exportStatsAsText(raw_ostream &OS,
const XRayFileHeader &Header) const {
OS << "Functions with latencies: " << FunctionLatencies.size() << "\n";
// We spend some effort to make the text output more readable, so we do the
// following formatting decisions for each of the fields:
//
// - funcid: 32-bit, but we can determine the largest number and be
// between
// a minimum of 5 characters, up to 9 characters, right aligned.
// - count: 64-bit, but we can determine the largest number and be
// between
// a minimum of 5 characters, up to 9 characters, right aligned.
// - min, median, 90pct, 99pct, max: double precision, but we want to keep
// the values in seconds, with microsecond precision (0.000'001), so we
// have at most 6 significant digits, with the whole number part to be
// at
// least 1 character. For readability we'll right-align, with full 9
// characters each.
// - debug info, function name: we format this as a concatenation of the
// debug info and the function name.
//
static constexpr char StatsHeaderFormat[] =
"{0,+9} {1,+10} [{2,+9}, {3,+9}, {4,+9}, {5,+9}, {6,+9}] {7,+9}";
static constexpr char StatsFormat[] =
R"({0,+9} {1,+10} [{2,+9:f6}, {3,+9:f6}, {4,+9:f6}, {5,+9:f6}, {6,+9:f6}] {7,+9:f6})";
OS << llvm::formatv(StatsHeaderFormat, "funcid", "count", "min", "med", "90p",
"99p", "max", "sum")
<< llvm::formatv(" {0,-12}\n", "function");
exportStats(Header, [&](int32_t FuncId, size_t Count, const ResultRow &Row) {
OS << llvm::formatv(StatsFormat, FuncId, Count, Row.Min, Row.Median,
Row.Pct90, Row.Pct99, Row.Max, Row.Sum)
<< " " << Row.DebugInfo << ": " << Row.Function << "\n";
});
}
void LatencyAccountant::exportStatsAsCSV(raw_ostream &OS,
const XRayFileHeader &Header) const {
OS << "funcid,count,min,median,90%ile,99%ile,max,sum,debug,function\n";
exportStats(Header, [&](int32_t FuncId, size_t Count, const ResultRow &Row) {
OS << FuncId << ',' << Count << ',' << Row.Min << ',' << Row.Median << ','
<< Row.Pct90 << ',' << Row.Pct99 << ',' << Row.Max << "," << Row.Sum
<< ",\"" << Row.DebugInfo << "\",\"" << Row.Function << "\"\n";
});
}
using namespace llvm::xray;
static CommandRegistration Unused(&Account, []() -> Error {
InstrumentationMap Map;
if (!AccountInstrMap.empty()) {
auto InstrumentationMapOrError = loadInstrumentationMap(AccountInstrMap);
if (!InstrumentationMapOrError)
return joinErrors(make_error<StringError>(
Twine("Cannot open instrumentation map '") +
AccountInstrMap + "'",
std::make_error_code(std::errc::invalid_argument)),
InstrumentationMapOrError.takeError());
Map = std::move(*InstrumentationMapOrError);
}
std::error_code EC;
raw_fd_ostream OS(AccountOutput, EC, sys::fs::OpenFlags::F_Text);
if (EC)
return make_error<StringError>(
Twine("Cannot open file '") + AccountOutput + "' for writing.", EC);
const auto &FunctionAddresses = Map.getFunctionAddresses();
symbolize::LLVMSymbolizer::Options Opts(
symbolize::FunctionNameKind::LinkageName, true, true, false, "");
symbolize::LLVMSymbolizer Symbolizer(Opts);
llvm::xray::FuncIdConversionHelper FuncIdHelper(AccountInstrMap, Symbolizer,
FunctionAddresses);
xray::LatencyAccountant FCA(FuncIdHelper, AccountDeduceSiblingCalls);
auto TraceOrErr = loadTraceFile(AccountInput);
if (!TraceOrErr)
return joinErrors(
make_error<StringError>(
Twine("Failed loading input file '") + AccountInput + "'",
std::make_error_code(std::errc::executable_format_error)),
TraceOrErr.takeError());
auto &T = *TraceOrErr;
for (const auto &Record : T) {
if (FCA.accountRecord(Record))
continue;
for (const auto &ThreadStack : FCA.getPerThreadFunctionStack()) {
errs() << "Thread ID: " << ThreadStack.first << "\n";
auto Level = ThreadStack.second.size();
for (const auto &Entry : llvm::reverse(ThreadStack.second))
errs() << "#" << Level-- << "\t"
<< FuncIdHelper.SymbolOrNumber(Entry.first) << '\n';
}
if (!AccountKeepGoing)
return make_error<StringError>(
Twine("Failed accounting function calls in file '") + AccountInput +
"'.",
std::make_error_code(std::errc::executable_format_error));
}
switch (AccountOutputFormat) {
case AccountOutputFormats::TEXT:
FCA.exportStatsAsText(OS, T.getFileHeader());
break;
case AccountOutputFormats::CSV:
FCA.exportStatsAsCSV(OS, T.getFileHeader());
break;
}
return Error::success();
});
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