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#include "counters.h"
#include <yt/yt/core/misc/proc.h>
#include <yt/yt/core/misc/error.h>
#include <yt/yt/core/misc/singleton.h>
#include <yt/yt/library/profiling/sensor.h>
#include <library/cpp/yt/assert/assert.h>
#include <library/cpp/yt/system/handle_eintr.h>
#include <linux/perf_event.h>
#include <sys/syscall.h>
namespace NYT::NProfiling {
////////////////////////////////////////////////////////////////////////////////
namespace {
struct TPerfEventDescription final
{
int EventType;
int EventConfig;
};
constexpr TPerfEventDescription SoftwareEvent(int perfName) noexcept
{
return {PERF_TYPE_SOFTWARE, perfName};
}
constexpr TPerfEventDescription HardwareEvent(int perfName) noexcept
{
return {PERF_TYPE_HARDWARE, perfName};
}
enum class ECacheEventType
{
Access,
Miss,
};
enum class ECacheActionType
{
Load,
Store,
};
TPerfEventDescription CacheEvent(
int perfName,
ECacheActionType eventType,
ECacheEventType eventResultType) noexcept
{
constexpr auto kEventNameShift = 0;
constexpr auto kCacheActionTypeShift = 8;
constexpr auto kEventTypeShift = 16;
int cacheActionTypeForConfig = [&] {
switch (eventType) {
case ECacheActionType::Load:
return PERF_COUNT_HW_CACHE_OP_READ;
case ECacheActionType::Store:
return PERF_COUNT_HW_CACHE_OP_WRITE;
default:
YT_ABORT();
}
}();
int eventTypeForConfig = [&] {
switch (eventResultType) {
case ECacheEventType::Access:
return PERF_COUNT_HW_CACHE_RESULT_ACCESS;
case ECacheEventType::Miss:
return PERF_COUNT_HW_CACHE_RESULT_MISS;
default:
YT_ABORT();
}
}();
int eventConfig = (perfName << kEventNameShift) |
(cacheActionTypeForConfig << kCacheActionTypeShift) |
(eventTypeForConfig << kEventTypeShift);
return {PERF_TYPE_HW_CACHE, eventConfig};
}
TPerfEventDescription GetDescription(EPerfEventType type)
{
switch (type) {
case EPerfEventType::CpuCycles:
return HardwareEvent(PERF_COUNT_HW_CPU_CYCLES);
case EPerfEventType::Instructions:
return HardwareEvent(PERF_COUNT_HW_INSTRUCTIONS);
case EPerfEventType::CacheReferences:
return HardwareEvent(PERF_COUNT_HW_CACHE_REFERENCES);
case EPerfEventType::CacheMisses:
return HardwareEvent(PERF_COUNT_HW_CACHE_MISSES);
case EPerfEventType::BranchInstructions:
return HardwareEvent(PERF_COUNT_HW_BRANCH_INSTRUCTIONS);
case EPerfEventType::BranchMisses:
return HardwareEvent(PERF_COUNT_HW_BRANCH_MISSES);
case EPerfEventType::BusCycles:
return HardwareEvent(PERF_COUNT_HW_BUS_CYCLES);
case EPerfEventType::StalledCyclesFrontend:
return HardwareEvent(PERF_COUNT_HW_STALLED_CYCLES_FRONTEND);
case EPerfEventType::StalledCyclesBackend:
return HardwareEvent(PERF_COUNT_HW_STALLED_CYCLES_BACKEND);
case EPerfEventType::RefCpuCycles:
return HardwareEvent(PERF_COUNT_HW_REF_CPU_CYCLES);
case EPerfEventType::PageFaults:
return SoftwareEvent(PERF_COUNT_SW_PAGE_FAULTS);
case EPerfEventType::MinorPageFaults:
return SoftwareEvent(PERF_COUNT_SW_PAGE_FAULTS_MIN);
case EPerfEventType::MajorPageFaults:
return SoftwareEvent(PERF_COUNT_SW_PAGE_FAULTS_MAJ);
// `cpu-clock` is a bit broken according to this: https://stackoverflow.com/a/56967896
case EPerfEventType::CpuClock:
return SoftwareEvent(PERF_COUNT_SW_CPU_CLOCK);
case EPerfEventType::TaskClock:
return SoftwareEvent(PERF_COUNT_SW_TASK_CLOCK);
case EPerfEventType::ContextSwitches:
return SoftwareEvent(PERF_COUNT_SW_CONTEXT_SWITCHES);
case EPerfEventType::CpuMigrations:
return SoftwareEvent(PERF_COUNT_SW_CPU_MIGRATIONS);
case EPerfEventType::AlignmentFaults:
return SoftwareEvent(PERF_COUNT_SW_ALIGNMENT_FAULTS);
case EPerfEventType::EmulationFaults:
return SoftwareEvent(PERF_COUNT_SW_EMULATION_FAULTS);
case EPerfEventType::DataTlbReferences:
return CacheEvent(PERF_COUNT_HW_CACHE_DTLB, ECacheActionType::Load, ECacheEventType::Access);
case EPerfEventType::DataTlbMisses:
return CacheEvent(PERF_COUNT_HW_CACHE_DTLB, ECacheActionType::Load, ECacheEventType::Miss);
case EPerfEventType::DataStoreTlbReferences:
return CacheEvent(PERF_COUNT_HW_CACHE_DTLB, ECacheActionType::Store, ECacheEventType::Access);
case EPerfEventType::DataStoreTlbMisses:
return CacheEvent(PERF_COUNT_HW_CACHE_DTLB, ECacheActionType::Store, ECacheEventType::Miss);
// Apparently it doesn't make sense to treat these values as relative:
// https://stackoverflow.com/questions/49933319/how-to-interpret-perf-itlb-loads-itlb-load-misses
case EPerfEventType::InstructionTlbReferences:
return CacheEvent(PERF_COUNT_HW_CACHE_ITLB, ECacheActionType::Load, ECacheEventType::Access);
case EPerfEventType::InstructionTlbMisses:
return CacheEvent(PERF_COUNT_HW_CACHE_ITLB, ECacheActionType::Load, ECacheEventType::Miss);
case EPerfEventType::LocalMemoryReferences:
return CacheEvent(PERF_COUNT_HW_CACHE_NODE, ECacheActionType::Load, ECacheEventType::Access);
case EPerfEventType::LocalMemoryMisses:
return CacheEvent(PERF_COUNT_HW_CACHE_NODE, ECacheActionType::Load, ECacheEventType::Miss);
default:
YT_ABORT();
}
}
int OpenPerfEvent(int tid, int eventType, int eventConfig)
{
perf_event_attr attr{};
attr.type = eventType;
attr.size = sizeof(attr);
attr.config = eventConfig;
attr.inherit = 1;
int fd = HandleEintr(syscall, SYS_perf_event_open, &attr, tid, -1, -1, PERF_FLAG_FD_CLOEXEC);
if (fd == -1) {
THROW_ERROR_EXCEPTION("Failed to open perf event descriptor")
<< TError::FromSystem()
<< TErrorAttribute("type", eventType)
<< TErrorAttribute("config", eventConfig);
}
return fd;
}
ui64 FetchPerfCounter(int fd)
{
ui64 num{};
if (HandleEintr(read, fd, &num, sizeof(num)) != sizeof(num)) {
THROW_ERROR_EXCEPTION("Failed to read perf event counter")
<< TError::FromSystem();
}
return num;
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
TPerfEventCounter::TPerfEventCounter(EPerfEventType type)
: FD_(OpenPerfEvent(
0,
GetDescription(type).EventType,
GetDescription(type).EventConfig))
{ }
TPerfEventCounter::~TPerfEventCounter()
{
if (FD_ != -1) {
SafeClose(FD_, false);
}
}
ui64 TPerfEventCounter::Read()
{
return FetchPerfCounter(FD_);
}
////////////////////////////////////////////////////////////////////////////////
DECLARE_REFCOUNTED_STRUCT(TCounterOwner)
struct TCounterOwner
: public TRefCounted
{
std::vector<std::unique_ptr<TPerfEventCounter>> Counters;
};
DEFINE_REFCOUNTED_TYPE(TCounterOwner)
void EnablePerfCounters()
{
auto owner = LeakyRefCountedSingleton<TCounterOwner>();
auto exportCounter = [&] (const TString& category, const TString& name, EPerfEventType type) {
try {
owner->Counters.emplace_back(new TPerfEventCounter{type});
TProfiler{category}.AddFuncCounter(name, owner, [counter=owner->Counters.back().get()] {
return counter->Read();
});
} catch (const std::exception&) {
}
};
exportCounter("/cpu/perf", "/cycles", EPerfEventType::CpuCycles);
exportCounter("/cpu/perf", "/instructions", EPerfEventType::Instructions);
exportCounter("/cpu/perf", "/branch_instructions", EPerfEventType::BranchInstructions);
exportCounter("/cpu/perf", "/branch_misses", EPerfEventType::BranchMisses);
exportCounter("/cpu/perf", "/context_switches", EPerfEventType::ContextSwitches);
exportCounter("/memory/perf", "/page_faults", EPerfEventType::PageFaults);
exportCounter("/memory/perf", "/minor_page_faults", EPerfEventType::MinorPageFaults);
exportCounter("/memory/perf", "/major_page_faults", EPerfEventType::MajorPageFaults);
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NProfiling
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