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tracy/public/client/TracySysTrace.cpp
Cody Tapscott 6249999153 linux: respect TRACY_NO_SAMPLING for sys-tracing 
This compile-time flag was being ignored on Linux. This change adds
gating for software-sampled stack trace sampling following the same
pattern as other `TRACY_NO_SAMPLE_*` options.

If `TRACY_NO_SAMPLING=1` is provided as an environment variable,
software stack sampling is also disabled.
2023-04-04 17:22:31 -04:00

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#include "TracyDebug.hpp"
#include "TracyStringHelpers.hpp"
#include "TracySysTrace.hpp"
#include "../common/TracySystem.hpp"
#ifdef TRACY_HAS_SYSTEM_TRACING
#ifndef TRACY_SAMPLING_HZ
# if defined _WIN32
# define TRACY_SAMPLING_HZ 8000
# elif defined __linux__
# define TRACY_SAMPLING_HZ 10000
# endif
#endif
namespace tracy
{
static constexpr int GetSamplingFrequency()
{
#if defined _WIN32
return TRACY_SAMPLING_HZ > 8000 ? 8000 : ( TRACY_SAMPLING_HZ < 1 ? 1 : TRACY_SAMPLING_HZ );
#else
return TRACY_SAMPLING_HZ > 1000000 ? 1000000 : ( TRACY_SAMPLING_HZ < 1 ? 1 : TRACY_SAMPLING_HZ );
#endif
}
static constexpr int GetSamplingPeriod()
{
return 1000000000 / GetSamplingFrequency();
}
}
# if defined _WIN32
# ifndef NOMINMAX
# define NOMINMAX
# endif
# define INITGUID
# include <assert.h>
# include <string.h>
# include <windows.h>
# include <dbghelp.h>
# include <evntrace.h>
# include <evntcons.h>
# include <psapi.h>
# include <winternl.h>
# include "../common/TracyAlloc.hpp"
# include "../common/TracySystem.hpp"
# include "TracyProfiler.hpp"
# include "TracyThread.hpp"
namespace tracy
{
static const GUID PerfInfoGuid = { 0xce1dbfb4, 0x137e, 0x4da6, { 0x87, 0xb0, 0x3f, 0x59, 0xaa, 0x10, 0x2c, 0xbc } };
static const GUID DxgKrnlGuid = { 0x802ec45a, 0x1e99, 0x4b83, { 0x99, 0x20, 0x87, 0xc9, 0x82, 0x77, 0xba, 0x9d } };
static const GUID ThreadV2Guid = { 0x3d6fa8d1, 0xfe05, 0x11d0, { 0x9d, 0xda, 0x00, 0xc0, 0x4f, 0xd7, 0xba, 0x7c } };
static TRACEHANDLE s_traceHandle;
static TRACEHANDLE s_traceHandle2;
static EVENT_TRACE_PROPERTIES* s_prop;
static DWORD s_pid;
static EVENT_TRACE_PROPERTIES* s_propVsync;
static TRACEHANDLE s_traceHandleVsync;
static TRACEHANDLE s_traceHandleVsync2;
Thread* s_threadVsync = nullptr;
struct CSwitch
{
uint32_t newThreadId;
uint32_t oldThreadId;
int8_t newThreadPriority;
int8_t oldThreadPriority;
uint8_t previousCState;
int8_t spareByte;
int8_t oldThreadWaitReason;
int8_t oldThreadWaitMode;
int8_t oldThreadState;
int8_t oldThreadWaitIdealProcessor;
uint32_t newThreadWaitTime;
uint32_t reserved;
};
struct ReadyThread
{
uint32_t threadId;
int8_t adjustReason;
int8_t adjustIncrement;
int8_t flag;
int8_t reserverd;
};
struct ThreadTrace
{
uint32_t processId;
uint32_t threadId;
uint32_t stackBase;
uint32_t stackLimit;
uint32_t userStackBase;
uint32_t userStackLimit;
uint32_t startAddr;
uint32_t win32StartAddr;
uint32_t tebBase;
uint32_t subProcessTag;
};
struct StackWalkEvent
{
uint64_t eventTimeStamp;
uint32_t stackProcess;
uint32_t stackThread;
uint64_t stack[192];
};
struct VSyncInfo
{
void* dxgAdapter;
uint32_t vidPnTargetId;
uint64_t scannedPhysicalAddress;
uint32_t vidPnSourceId;
uint32_t frameNumber;
int64_t frameQpcTime;
void* hFlipDevice;
uint32_t flipType;
uint64_t flipFenceId;
};
extern "C" typedef NTSTATUS (WINAPI *t_NtQueryInformationThread)( HANDLE, THREADINFOCLASS, PVOID, ULONG, PULONG );
extern "C" typedef BOOL (WINAPI *t_EnumProcessModules)( HANDLE, HMODULE*, DWORD, LPDWORD );
extern "C" typedef BOOL (WINAPI *t_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
extern "C" typedef DWORD (WINAPI *t_GetModuleBaseNameA)( HANDLE, HMODULE, LPSTR, DWORD );
extern "C" typedef HRESULT (WINAPI *t_GetThreadDescription)( HANDLE, PWSTR* );
t_NtQueryInformationThread NtQueryInformationThread = (t_NtQueryInformationThread)GetProcAddress( GetModuleHandleA( "ntdll.dll" ), "NtQueryInformationThread" );
t_EnumProcessModules _EnumProcessModules = (t_EnumProcessModules)GetProcAddress( GetModuleHandleA( "kernel32.dll" ), "K32EnumProcessModules" );
t_GetModuleInformation _GetModuleInformation = (t_GetModuleInformation)GetProcAddress( GetModuleHandleA( "kernel32.dll" ), "K32GetModuleInformation" );
t_GetModuleBaseNameA _GetModuleBaseNameA = (t_GetModuleBaseNameA)GetProcAddress( GetModuleHandleA( "kernel32.dll" ), "K32GetModuleBaseNameA" );
static t_GetThreadDescription _GetThreadDescription = 0;
void WINAPI EventRecordCallback( PEVENT_RECORD record )
{
#ifdef TRACY_ON_DEMAND
if( !GetProfiler().IsConnected() ) return;
#endif
const auto& hdr = record->EventHeader;
switch( hdr.ProviderId.Data1 )
{
case 0x3d6fa8d1: // Thread Guid
if( hdr.EventDescriptor.Opcode == 36 )
{
const auto cswitch = (const CSwitch*)record->UserData;
TracyLfqPrepare( QueueType::ContextSwitch );
MemWrite( &item->contextSwitch.time, hdr.TimeStamp.QuadPart );
MemWrite( &item->contextSwitch.oldThread, cswitch->oldThreadId );
MemWrite( &item->contextSwitch.newThread, cswitch->newThreadId );
MemWrite( &item->contextSwitch.cpu, record->BufferContext.ProcessorNumber );
MemWrite( &item->contextSwitch.reason, cswitch->oldThreadWaitReason );
MemWrite( &item->contextSwitch.state, cswitch->oldThreadState );
TracyLfqCommit;
}
else if( hdr.EventDescriptor.Opcode == 50 )
{
const auto rt = (const ReadyThread*)record->UserData;
TracyLfqPrepare( QueueType::ThreadWakeup );
MemWrite( &item->threadWakeup.time, hdr.TimeStamp.QuadPart );
MemWrite( &item->threadWakeup.thread, rt->threadId );
TracyLfqCommit;
}
else if( hdr.EventDescriptor.Opcode == 1 || hdr.EventDescriptor.Opcode == 3 )
{
const auto tt = (const ThreadTrace*)record->UserData;
uint64_t tid = tt->threadId;
if( tid == 0 ) return;
uint64_t pid = tt->processId;
TracyLfqPrepare( QueueType::TidToPid );
MemWrite( &item->tidToPid.tid, tid );
MemWrite( &item->tidToPid.pid, pid );
TracyLfqCommit;
}
break;
case 0xdef2fe46: // StackWalk Guid
if( hdr.EventDescriptor.Opcode == 32 )
{
const auto sw = (const StackWalkEvent*)record->UserData;
if( sw->stackProcess == s_pid )
{
const uint64_t sz = ( record->UserDataLength - 16 ) / 8;
if( sz > 0 )
{
auto trace = (uint64_t*)tracy_malloc( ( 1 + sz ) * sizeof( uint64_t ) );
memcpy( trace, &sz, sizeof( uint64_t ) );
memcpy( trace+1, sw->stack, sizeof( uint64_t ) * sz );
TracyLfqPrepare( QueueType::CallstackSample );
MemWrite( &item->callstackSampleFat.time, sw->eventTimeStamp );
MemWrite( &item->callstackSampleFat.thread, sw->stackThread );
MemWrite( &item->callstackSampleFat.ptr, (uint64_t)trace );
TracyLfqCommit;
}
}
}
break;
default:
break;
}
}
void WINAPI EventRecordCallbackVsync( PEVENT_RECORD record )
{
#ifdef TRACY_ON_DEMAND
if( !GetProfiler().IsConnected() ) return;
#endif
const auto& hdr = record->EventHeader;
assert( hdr.ProviderId.Data1 == 0x802EC45A );
assert( hdr.EventDescriptor.Id == 0x0011 );
const auto vs = (const VSyncInfo*)record->UserData;
TracyLfqPrepare( QueueType::FrameVsync );
MemWrite( &item->frameVsync.time, hdr.TimeStamp.QuadPart );
MemWrite( &item->frameVsync.id, vs->vidPnTargetId );
TracyLfqCommit;
}
static void SetupVsync()
{
#if _WIN32_WINNT >= _WIN32_WINNT_WINBLUE && !defined(__MINGW32__)
const auto psz = sizeof( EVENT_TRACE_PROPERTIES ) + MAX_PATH;
s_propVsync = (EVENT_TRACE_PROPERTIES*)tracy_malloc( psz );
memset( s_propVsync, 0, sizeof( EVENT_TRACE_PROPERTIES ) );
s_propVsync->LogFileMode = EVENT_TRACE_REAL_TIME_MODE;
s_propVsync->Wnode.BufferSize = psz;
#ifdef TRACY_TIMER_QPC
s_propVsync->Wnode.ClientContext = 1;
#else
s_propVsync->Wnode.ClientContext = 3;
#endif
s_propVsync->LoggerNameOffset = sizeof( EVENT_TRACE_PROPERTIES );
strcpy( ((char*)s_propVsync) + sizeof( EVENT_TRACE_PROPERTIES ), "TracyVsync" );
auto backup = tracy_malloc( psz );
memcpy( backup, s_propVsync, psz );
const auto controlStatus = ControlTraceA( 0, "TracyVsync", s_propVsync, EVENT_TRACE_CONTROL_STOP );
if( controlStatus != ERROR_SUCCESS && controlStatus != ERROR_WMI_INSTANCE_NOT_FOUND )
{
tracy_free( backup );
tracy_free( s_propVsync );
return;
}
memcpy( s_propVsync, backup, psz );
tracy_free( backup );
const auto startStatus = StartTraceA( &s_traceHandleVsync, "TracyVsync", s_propVsync );
if( startStatus != ERROR_SUCCESS )
{
tracy_free( s_propVsync );
return;
}
EVENT_FILTER_EVENT_ID fe = {};
fe.FilterIn = TRUE;
fe.Count = 1;
fe.Events[0] = 0x0011; // VSyncDPC_Info
EVENT_FILTER_DESCRIPTOR desc = {};
desc.Ptr = (ULONGLONG)&fe;
desc.Size = sizeof( fe );
desc.Type = EVENT_FILTER_TYPE_EVENT_ID;
ENABLE_TRACE_PARAMETERS params = {};
params.Version = ENABLE_TRACE_PARAMETERS_VERSION_2;
params.EnableProperty = EVENT_ENABLE_PROPERTY_IGNORE_KEYWORD_0;
params.SourceId = s_propVsync->Wnode.Guid;
params.EnableFilterDesc = &desc;
params.FilterDescCount = 1;
uint64_t mask = 0x4000000000000001; // Microsoft_Windows_DxgKrnl_Performance | Base
if( EnableTraceEx2( s_traceHandleVsync, &DxgKrnlGuid, EVENT_CONTROL_CODE_ENABLE_PROVIDER, TRACE_LEVEL_INFORMATION, mask, mask, 0, &params ) != ERROR_SUCCESS )
{
tracy_free( s_propVsync );
return;
}
char loggerName[MAX_PATH];
strcpy( loggerName, "TracyVsync" );
EVENT_TRACE_LOGFILEA log = {};
log.LoggerName = loggerName;
log.ProcessTraceMode = PROCESS_TRACE_MODE_REAL_TIME | PROCESS_TRACE_MODE_EVENT_RECORD | PROCESS_TRACE_MODE_RAW_TIMESTAMP;
log.EventRecordCallback = EventRecordCallbackVsync;
s_traceHandleVsync2 = OpenTraceA( &log );
if( s_traceHandleVsync2 == (TRACEHANDLE)INVALID_HANDLE_VALUE )
{
CloseTrace( s_traceHandleVsync );
tracy_free( s_propVsync );
return;
}
s_threadVsync = (Thread*)tracy_malloc( sizeof( Thread ) );
new(s_threadVsync) Thread( [] (void*) {
ThreadExitHandler threadExitHandler;
SetThreadPriority( GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL );
SetThreadName( "Tracy Vsync" );
ProcessTrace( &s_traceHandleVsync2, 1, nullptr, nullptr );
}, nullptr );
#endif
}
static constexpr int GetSamplingInterval()
{
return GetSamplingPeriod() / 100;
}
bool SysTraceStart( int64_t& samplingPeriod )
{
if( !_GetThreadDescription ) _GetThreadDescription = (t_GetThreadDescription)GetProcAddress( GetModuleHandleA( "kernel32.dll" ), "GetThreadDescription" );
s_pid = GetCurrentProcessId();
#if defined _WIN64
constexpr bool isOs64Bit = true;
#else
BOOL _iswow64;
IsWow64Process( GetCurrentProcess(), &_iswow64 );
const bool isOs64Bit = _iswow64;
#endif
TOKEN_PRIVILEGES priv = {};
priv.PrivilegeCount = 1;
priv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
if( LookupPrivilegeValue( nullptr, SE_SYSTEM_PROFILE_NAME, &priv.Privileges[0].Luid ) == 0 ) return false;
HANDLE pt;
if( OpenProcessToken( GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &pt ) == 0 ) return false;
const auto adjust = AdjustTokenPrivileges( pt, FALSE, &priv, 0, nullptr, nullptr );
CloseHandle( pt );
if( adjust == 0 ) return false;
const auto status = GetLastError();
if( status != ERROR_SUCCESS ) return false;
if( isOs64Bit )
{
TRACE_PROFILE_INTERVAL interval = {};
interval.Interval = GetSamplingInterval();
const auto intervalStatus = TraceSetInformation( 0, TraceSampledProfileIntervalInfo, &interval, sizeof( interval ) );
if( intervalStatus != ERROR_SUCCESS ) return false;
samplingPeriod = GetSamplingPeriod();
}
const auto psz = sizeof( EVENT_TRACE_PROPERTIES ) + sizeof( KERNEL_LOGGER_NAME );
s_prop = (EVENT_TRACE_PROPERTIES*)tracy_malloc( psz );
memset( s_prop, 0, sizeof( EVENT_TRACE_PROPERTIES ) );
ULONG flags = 0;
#ifndef TRACY_NO_CONTEXT_SWITCH
flags = EVENT_TRACE_FLAG_CSWITCH | EVENT_TRACE_FLAG_DISPATCHER | EVENT_TRACE_FLAG_THREAD;
#endif
#ifndef TRACY_NO_SAMPLING
if( isOs64Bit ) flags |= EVENT_TRACE_FLAG_PROFILE;
#endif
s_prop->EnableFlags = flags;
s_prop->LogFileMode = EVENT_TRACE_REAL_TIME_MODE;
s_prop->Wnode.BufferSize = psz;
s_prop->Wnode.Flags = WNODE_FLAG_TRACED_GUID;
#ifdef TRACY_TIMER_QPC
s_prop->Wnode.ClientContext = 1;
#else
s_prop->Wnode.ClientContext = 3;
#endif
s_prop->Wnode.Guid = SystemTraceControlGuid;
s_prop->BufferSize = 1024;
s_prop->MinimumBuffers = std::thread::hardware_concurrency() * 4;
s_prop->MaximumBuffers = std::thread::hardware_concurrency() * 6;
s_prop->LoggerNameOffset = sizeof( EVENT_TRACE_PROPERTIES );
memcpy( ((char*)s_prop) + sizeof( EVENT_TRACE_PROPERTIES ), KERNEL_LOGGER_NAME, sizeof( KERNEL_LOGGER_NAME ) );
auto backup = tracy_malloc( psz );
memcpy( backup, s_prop, psz );
const auto controlStatus = ControlTrace( 0, KERNEL_LOGGER_NAME, s_prop, EVENT_TRACE_CONTROL_STOP );
if( controlStatus != ERROR_SUCCESS && controlStatus != ERROR_WMI_INSTANCE_NOT_FOUND )
{
tracy_free( backup );
tracy_free( s_prop );
return false;
}
memcpy( s_prop, backup, psz );
tracy_free( backup );
const auto startStatus = StartTrace( &s_traceHandle, KERNEL_LOGGER_NAME, s_prop );
if( startStatus != ERROR_SUCCESS )
{
tracy_free( s_prop );
return false;
}
#ifndef TRACY_NO_SAMPLING
if( isOs64Bit )
{
CLASSIC_EVENT_ID stackId[2] = {};
stackId[0].EventGuid = PerfInfoGuid;
stackId[0].Type = 46;
stackId[1].EventGuid = ThreadV2Guid;
stackId[1].Type = 36;
const auto stackStatus = TraceSetInformation( s_traceHandle, TraceStackTracingInfo, &stackId, sizeof( stackId ) );
if( stackStatus != ERROR_SUCCESS )
{
tracy_free( s_prop );
return false;
}
}
#endif
#ifdef UNICODE
WCHAR KernelLoggerName[sizeof( KERNEL_LOGGER_NAME )];
#else
char KernelLoggerName[sizeof( KERNEL_LOGGER_NAME )];
#endif
memcpy( KernelLoggerName, KERNEL_LOGGER_NAME, sizeof( KERNEL_LOGGER_NAME ) );
EVENT_TRACE_LOGFILE log = {};
log.LoggerName = KernelLoggerName;
log.ProcessTraceMode = PROCESS_TRACE_MODE_REAL_TIME | PROCESS_TRACE_MODE_EVENT_RECORD | PROCESS_TRACE_MODE_RAW_TIMESTAMP;
log.EventRecordCallback = EventRecordCallback;
s_traceHandle2 = OpenTrace( &log );
if( s_traceHandle2 == (TRACEHANDLE)INVALID_HANDLE_VALUE )
{
CloseTrace( s_traceHandle );
tracy_free( s_prop );
return false;
}
#ifndef TRACY_NO_VSYNC_CAPTURE
SetupVsync();
#endif
return true;
}
void SysTraceStop()
{
if( s_threadVsync )
{
CloseTrace( s_traceHandleVsync2 );
CloseTrace( s_traceHandleVsync );
s_threadVsync->~Thread();
tracy_free( s_threadVsync );
}
CloseTrace( s_traceHandle2 );
CloseTrace( s_traceHandle );
}
void SysTraceWorker( void* ptr )
{
ThreadExitHandler threadExitHandler;
SetThreadPriority( GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL );
SetThreadName( "Tracy SysTrace" );
ProcessTrace( &s_traceHandle2, 1, 0, 0 );
ControlTrace( 0, KERNEL_LOGGER_NAME, s_prop, EVENT_TRACE_CONTROL_STOP );
tracy_free( s_prop );
}
void SysTraceGetExternalName( uint64_t thread, const char*& threadName, const char*& name )
{
bool threadSent = false;
auto hnd = OpenThread( THREAD_QUERY_INFORMATION, FALSE, DWORD( thread ) );
if( hnd == 0 )
{
hnd = OpenThread( THREAD_QUERY_LIMITED_INFORMATION, FALSE, DWORD( thread ) );
}
if( hnd != 0 )
{
if( _GetThreadDescription )
{
PWSTR tmp;
_GetThreadDescription( hnd, &tmp );
char buf[256];
if( tmp )
{
auto ret = wcstombs( buf, tmp, 256 );
if( ret != 0 )
{
threadName = CopyString( buf, ret );
threadSent = true;
}
}
}
const auto pid = GetProcessIdOfThread( hnd );
if( !threadSent && NtQueryInformationThread && _EnumProcessModules && _GetModuleInformation && _GetModuleBaseNameA )
{
void* ptr;
ULONG retlen;
auto status = NtQueryInformationThread( hnd, (THREADINFOCLASS)9 /*ThreadQuerySetWin32StartAddress*/, &ptr, sizeof( &ptr ), &retlen );
if( status == 0 )
{
const auto phnd = OpenProcess( PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, pid );
if( phnd != INVALID_HANDLE_VALUE )
{
HMODULE modules[1024];
DWORD needed;
if( _EnumProcessModules( phnd, modules, 1024 * sizeof( HMODULE ), &needed ) != 0 )
{
const auto sz = std::min( DWORD( needed / sizeof( HMODULE ) ), DWORD( 1024 ) );
for( DWORD i=0; i<sz; i++ )
{
MODULEINFO info;
if( _GetModuleInformation( phnd, modules[i], &info, sizeof( info ) ) != 0 )
{
if( (uint64_t)ptr >= (uint64_t)info.lpBaseOfDll && (uint64_t)ptr <= (uint64_t)info.lpBaseOfDll + (uint64_t)info.SizeOfImage )
{
char buf2[1024];
const auto modlen = _GetModuleBaseNameA( phnd, modules[i], buf2, 1024 );
if( modlen != 0 )
{
threadName = CopyString( buf2, modlen );
threadSent = true;
}
}
}
}
}
CloseHandle( phnd );
}
}
}
CloseHandle( hnd );
if( !threadSent )
{
threadName = CopyString( "???", 3 );
threadSent = true;
}
if( pid != 0 )
{
{
uint64_t _pid = pid;
TracyLfqPrepare( QueueType::TidToPid );
MemWrite( &item->tidToPid.tid, thread );
MemWrite( &item->tidToPid.pid, _pid );
TracyLfqCommit;
}
if( pid == 4 )
{
name = CopyStringFast( "System", 6 );
return;
}
else
{
const auto phnd = OpenProcess( PROCESS_QUERY_LIMITED_INFORMATION, FALSE, pid );
if( phnd != INVALID_HANDLE_VALUE )
{
char buf2[1024];
const auto sz = GetProcessImageFileNameA( phnd, buf2, 1024 );
CloseHandle( phnd );
if( sz != 0 )
{
auto ptr = buf2 + sz - 1;
while( ptr > buf2 && *ptr != '\\' ) ptr--;
if( *ptr == '\\' ) ptr++;
name = CopyStringFast( ptr );
return;
}
}
}
}
}
if( !threadSent )
{
threadName = CopyString( "???", 3 );
}
name = CopyStringFast( "???", 3 );
}
}
# elif defined __linux__
# include <sys/types.h>
# include <sys/stat.h>
# include <sys/wait.h>
# include <fcntl.h>
# include <inttypes.h>
# include <limits>
# include <poll.h>
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# include <unistd.h>
# include <atomic>
# include <thread>
# include <linux/perf_event.h>
# include <linux/version.h>
# include <sys/mman.h>
# include <sys/ioctl.h>
# include <sys/syscall.h>
# if defined __i386 || defined __x86_64__
# include "TracyCpuid.hpp"
# endif
# include "TracyProfiler.hpp"
# include "TracyRingBuffer.hpp"
# include "TracyThread.hpp"
namespace tracy
{
static std::atomic<bool> traceActive { false };
static int s_numCpus = 0;
static int s_numBuffers = 0;
static int s_ctxBufferIdx = 0;
static RingBuffer* s_ring = nullptr;
static const int ThreadHashSize = 4 * 1024;
static uint32_t s_threadHash[ThreadHashSize] = {};
static bool CurrentProcOwnsThread( uint32_t tid )
{
const auto hash = tid & ( ThreadHashSize-1 );
const auto hv = s_threadHash[hash];
if( hv == tid ) return true;
if( hv == -tid ) return false;
char path[256];
sprintf( path, "/proc/self/task/%d", tid );
struct stat st;
if( stat( path, &st ) == 0 )
{
s_threadHash[hash] = tid;
return true;
}
else
{
s_threadHash[hash] = -tid;
return false;
}
}
static int perf_event_open( struct perf_event_attr* hw_event, pid_t pid, int cpu, int group_fd, unsigned long flags )
{
return syscall( __NR_perf_event_open, hw_event, pid, cpu, group_fd, flags );
}
enum TraceEventId
{
EventCallstack,
EventCpuCycles,
EventInstructionsRetired,
EventCacheReference,
EventCacheMiss,
EventBranchRetired,
EventBranchMiss,
EventVsync,
EventContextSwitch,
EventWakeup,
};
static void ProbePreciseIp( perf_event_attr& pe, unsigned long long config0, unsigned long long config1, pid_t pid )
{
pe.config = config1;
pe.precise_ip = 3;
while( pe.precise_ip != 0 )
{
const int fd = perf_event_open( &pe, pid, 0, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
close( fd );
break;
}
pe.precise_ip--;
}
pe.config = config0;
while( pe.precise_ip != 0 )
{
const int fd = perf_event_open( &pe, pid, 0, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
close( fd );
break;
}
pe.precise_ip--;
}
TracyDebug( " Probed precise_ip: %i\n", pe.precise_ip );
}
static void ProbePreciseIp( perf_event_attr& pe, pid_t pid )
{
pe.precise_ip = 3;
while( pe.precise_ip != 0 )
{
const int fd = perf_event_open( &pe, pid, 0, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
close( fd );
break;
}
pe.precise_ip--;
}
TracyDebug( " Probed precise_ip: %i\n", pe.precise_ip );
}
static bool IsGenuineIntel()
{
#if defined __i386 || defined __x86_64__
uint32_t regs[4] = {};
__get_cpuid( 0, regs, regs+1, regs+2, regs+3 );
char manufacturer[12];
memcpy( manufacturer, regs+1, 4 );
memcpy( manufacturer+4, regs+3, 4 );
memcpy( manufacturer+8, regs+2, 4 );
return memcmp( manufacturer, "GenuineIntel", 12 ) == 0;
#else
return false;
#endif
}
static const char* ReadFile( const char* path )
{
int fd = open( path, O_RDONLY );
if( fd < 0 ) return nullptr;
static char tmp[64];
const auto cnt = read( fd, tmp, 63 );
close( fd );
if( cnt < 0 ) return nullptr;
tmp[cnt] = '\0';
return tmp;
}
bool SysTraceStart( int64_t& samplingPeriod )
{
#ifndef CLOCK_MONOTONIC_RAW
return false;
#endif
const auto paranoidLevelStr = ReadFile( "/proc/sys/kernel/perf_event_paranoid" );
if( !paranoidLevelStr ) return false;
#ifdef TRACY_VERBOSE
int paranoidLevel = 2;
paranoidLevel = atoi( paranoidLevelStr );
TracyDebug( "perf_event_paranoid: %i\n", paranoidLevel );
#endif
int switchId = -1, wakeupId = -1, vsyncId = -1;
const auto switchIdStr = ReadFile( "/sys/kernel/debug/tracing/events/sched/sched_switch/id" );
if( switchIdStr ) switchId = atoi( switchIdStr );
const auto wakeupIdStr = ReadFile( "/sys/kernel/debug/tracing/events/sched/sched_wakeup/id" );
if( wakeupIdStr ) wakeupId = atoi( wakeupIdStr );
const auto vsyncIdStr = ReadFile( "/sys/kernel/debug/tracing/events/drm/drm_vblank_event/id" );
if( vsyncIdStr ) vsyncId = atoi( vsyncIdStr );
TracyDebug( "sched_switch id: %i\n", switchId );
TracyDebug( "sched_wakeup id: %i\n", wakeupId );
TracyDebug( "drm_vblank_event id: %i\n", vsyncId );
#ifdef TRACY_NO_SAMPLING
const bool noSoftwareSampling = true;
#else
const char* noSoftwareSamplingEnv = GetEnvVar( "TRACY_NO_SAMPLING" );
const bool noSoftwareSampling = noSoftwareSamplingEnv && noSoftwareSamplingEnv[0] == '1';
#endif
#ifdef TRACY_NO_SAMPLE_RETIREMENT
const bool noRetirement = true;
#else
const char* noRetirementEnv = GetEnvVar( "TRACY_NO_SAMPLE_RETIREMENT" );
const bool noRetirement = noRetirementEnv && noRetirementEnv[0] == '1';
#endif
#ifdef TRACY_NO_SAMPLE_CACHE
const bool noCache = true;
#else
const char* noCacheEnv = GetEnvVar( "TRACY_NO_SAMPLE_CACHE" );
const bool noCache = noCacheEnv && noCacheEnv[0] == '1';
#endif
#ifdef TRACY_NO_SAMPLE_BRANCH
const bool noBranch = true;
#else
const char* noBranchEnv = GetEnvVar( "TRACY_NO_SAMPLE_BRANCH" );
const bool noBranch = noBranchEnv && noBranchEnv[0] == '1';
#endif
#ifdef TRACY_NO_CONTEXT_SWITCH
const bool noCtxSwitch = true;
#else
const char* noCtxSwitchEnv = GetEnvVar( "TRACY_NO_CONTEXT_SWITCH" );
const bool noCtxSwitch = noCtxSwitchEnv && noCtxSwitchEnv[0] == '1';
#endif
#ifdef TRACY_NO_VSYNC_CAPTURE
const bool noVsync = true;
#else
const char* noVsyncEnv = GetEnvVar( "TRACY_NO_VSYNC_CAPTURE" );
const bool noVsync = noVsyncEnv && noVsyncEnv[0] == '1';
#endif
samplingPeriod = GetSamplingPeriod();
uint32_t currentPid = (uint32_t)getpid();
s_numCpus = (int)std::thread::hardware_concurrency();
const auto maxNumBuffers = s_numCpus * (
1 + // software sampling
2 + // CPU cycles + instructions retired
2 + // cache reference + miss
2 + // branch retired + miss
2 + // context switches + wakeups
1 // vsync
);
s_ring = (RingBuffer*)tracy_malloc( sizeof( RingBuffer ) * maxNumBuffers );
s_numBuffers = 0;
// software sampling
perf_event_attr pe = {};
pe.type = PERF_TYPE_SOFTWARE;
pe.size = sizeof( perf_event_attr );
pe.config = PERF_COUNT_SW_CPU_CLOCK;
pe.sample_freq = GetSamplingFrequency();
pe.sample_type = PERF_SAMPLE_TID | PERF_SAMPLE_TIME | PERF_SAMPLE_CALLCHAIN;
#if LINUX_VERSION_CODE >= KERNEL_VERSION( 4, 8, 0 )
pe.sample_max_stack = 127;
#endif
pe.disabled = 1;
pe.freq = 1;
pe.inherit = 1;
#if !defined TRACY_HW_TIMER || !( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
pe.use_clockid = 1;
pe.clockid = CLOCK_MONOTONIC_RAW;
#endif
if( !noSoftwareSampling )
{
TracyDebug( "Setup software sampling\n" );
ProbePreciseIp( pe, currentPid );
for( int i=0; i<s_numCpus; i++ )
{
int fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd == -1 )
{
pe.exclude_kernel = 1;
ProbePreciseIp( pe, currentPid );
fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd == -1 )
{
TracyDebug( " Failed to setup!\n");
break;
}
TracyDebug( " No access to kernel samples\n" );
}
new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventCallstack );
if( s_ring[s_numBuffers].IsValid() )
{
s_numBuffers++;
TracyDebug( " Core %i ok\n", i );
}
}
}
// CPU cycles + instructions retired
pe = {};
pe.type = PERF_TYPE_HARDWARE;
pe.size = sizeof( perf_event_attr );
pe.sample_freq = 5000;
pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TIME;
pe.disabled = 1;
pe.exclude_kernel = 1;
pe.exclude_guest = 1;
pe.exclude_hv = 1;
pe.freq = 1;
pe.inherit = 1;
#if !defined TRACY_HW_TIMER || !( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
pe.use_clockid = 1;
pe.clockid = CLOCK_MONOTONIC_RAW;
#endif
if( !noRetirement )
{
TracyDebug( "Setup sampling cycles + retirement\n" );
ProbePreciseIp( pe, PERF_COUNT_HW_CPU_CYCLES, PERF_COUNT_HW_INSTRUCTIONS, currentPid );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventCpuCycles );
if( s_ring[s_numBuffers].IsValid() )
{
s_numBuffers++;
TracyDebug( " Core %i ok\n", i );
}
}
}
pe.config = PERF_COUNT_HW_INSTRUCTIONS;
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventInstructionsRetired );
if( s_ring[s_numBuffers].IsValid() )
{
s_numBuffers++;
TracyDebug( " Core %i ok\n", i );
}
}
}
}
// cache reference + miss
if( !noCache )
{
TracyDebug( "Setup sampling CPU cache references + misses\n" );
ProbePreciseIp( pe, PERF_COUNT_HW_CACHE_REFERENCES, PERF_COUNT_HW_CACHE_MISSES, currentPid );
if( IsGenuineIntel() )
{
pe.precise_ip = 0;
TracyDebug( " CPU is GenuineIntel, forcing precise_ip down to 0\n" );
}
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventCacheReference );
if( s_ring[s_numBuffers].IsValid() )
{
s_numBuffers++;
TracyDebug( " Core %i ok\n", i );
}
}
}
pe.config = PERF_COUNT_HW_CACHE_MISSES;
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventCacheMiss );
if( s_ring[s_numBuffers].IsValid() )
{
s_numBuffers++;
TracyDebug( " Core %i ok\n", i );
}
}
}
}
// branch retired + miss
if( !noBranch )
{
TracyDebug( "Setup sampling CPU branch retirements + misses\n" );
ProbePreciseIp( pe, PERF_COUNT_HW_BRANCH_INSTRUCTIONS, PERF_COUNT_HW_BRANCH_MISSES, currentPid );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventBranchRetired );
if( s_ring[s_numBuffers].IsValid() )
{
s_numBuffers++;
TracyDebug( " Core %i ok\n", i );
}
}
}
pe.config = PERF_COUNT_HW_BRANCH_MISSES;
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventBranchMiss );
if( s_ring[s_numBuffers].IsValid() )
{
s_numBuffers++;
TracyDebug( " Core %i ok\n", i );
}
}
}
}
s_ctxBufferIdx = s_numBuffers;
// vsync
if( !noVsync && vsyncId != -1 )
{
pe = {};
pe.type = PERF_TYPE_TRACEPOINT;
pe.size = sizeof( perf_event_attr );
pe.sample_period = 1;
pe.sample_type = PERF_SAMPLE_TIME | PERF_SAMPLE_RAW;
pe.disabled = 1;
pe.config = vsyncId;
#if !defined TRACY_HW_TIMER || !( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
pe.use_clockid = 1;
pe.clockid = CLOCK_MONOTONIC_RAW;
#endif
TracyDebug( "Setup vsync capture\n" );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventVsync, i );
if( s_ring[s_numBuffers].IsValid() )
{
s_numBuffers++;
TracyDebug( " Core %i ok\n", i );
}
}
}
}
// context switches
if( !noCtxSwitch && switchId != -1 )
{
pe = {};
pe.type = PERF_TYPE_TRACEPOINT;
pe.size = sizeof( perf_event_attr );
pe.sample_period = 1;
pe.sample_type = PERF_SAMPLE_TIME | PERF_SAMPLE_RAW | PERF_SAMPLE_CALLCHAIN;
#if LINUX_VERSION_CODE >= KERNEL_VERSION( 4, 8, 0 )
pe.sample_max_stack = 127;
#endif
pe.disabled = 1;
pe.inherit = 1;
pe.config = switchId;
#if !defined TRACY_HW_TIMER || !( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
pe.use_clockid = 1;
pe.clockid = CLOCK_MONOTONIC_RAW;
#endif
TracyDebug( "Setup context switch capture\n" );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
new( s_ring+s_numBuffers ) RingBuffer( 256*1024, fd, EventContextSwitch, i );
if( s_ring[s_numBuffers].IsValid() )
{
s_numBuffers++;
TracyDebug( " Core %i ok\n", i );
}
}
}
if( wakeupId != -1 )
{
pe.config = wakeupId;
pe.config &= ~PERF_SAMPLE_CALLCHAIN;
TracyDebug( "Setup wakeup capture\n" );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventWakeup, i );
if( s_ring[s_numBuffers].IsValid() )
{
s_numBuffers++;
TracyDebug( " Core %i ok\n", i );
}
}
}
}
}
TracyDebug( "Ringbuffers in use: %i\n", s_numBuffers );
traceActive.store( true, std::memory_order_relaxed );
return true;
}
void SysTraceStop()
{
traceActive.store( false, std::memory_order_relaxed );
}
static uint64_t* GetCallstackBlock( uint64_t cnt, RingBuffer& ring, uint64_t offset )
{
auto trace = (uint64_t*)tracy_malloc_fast( ( 1 + cnt ) * sizeof( uint64_t ) );
ring.Read( trace+1, offset, sizeof( uint64_t ) * cnt );
#if defined __x86_64__ || defined _M_X64
// remove non-canonical pointers
do
{
const auto test = (int64_t)trace[cnt];
const auto m1 = test >> 63;
const auto m2 = test >> 47;
if( m1 == m2 ) break;
}
while( --cnt > 0 );
for( uint64_t j=1; j<cnt; j++ )
{
const auto test = (int64_t)trace[j];
const auto m1 = test >> 63;
const auto m2 = test >> 47;
if( m1 != m2 ) trace[j] = 0;
}
#endif
for( uint64_t j=1; j<=cnt; j++ )
{
if( trace[j] >= (uint64_t)-4095 ) // PERF_CONTEXT_MAX
{
memmove( trace+j, trace+j+1, sizeof( uint64_t ) * ( cnt - j ) );
cnt--;
}
}
memcpy( trace, &cnt, sizeof( uint64_t ) );
return trace;
}
void SysTraceWorker( void* ptr )
{
ThreadExitHandler threadExitHandler;
SetThreadName( "Tracy Sampling" );
InitRpmalloc();
sched_param sp = { 99 };
if( pthread_setschedparam( pthread_self(), SCHED_FIFO, &sp ) != 0 ) TracyDebug( "Failed to increase SysTraceWorker thread priority!\n" );
auto ctxBufferIdx = s_ctxBufferIdx;
auto ringArray = s_ring;
auto numBuffers = s_numBuffers;
for( int i=0; i<numBuffers; i++ ) ringArray[i].Enable();
for(;;)
{
#ifdef TRACY_ON_DEMAND
if( !GetProfiler().IsConnected() )
{
if( !traceActive.load( std::memory_order_relaxed ) ) break;
for( int i=0; i<numBuffers; i++ )
{
auto& ring = ringArray[i];
const auto head = ring.LoadHead();
const auto tail = ring.GetTail();
if( head != tail )
{
const auto end = head - tail;
ring.Advance( end );
}
}
if( !traceActive.load( std::memory_order_relaxed ) ) break;
std::this_thread::sleep_for( std::chrono::milliseconds( 10 ) );
continue;
}
#endif
bool hadData = false;
for( int i=0; i<ctxBufferIdx; i++ )
{
if( !traceActive.load( std::memory_order_relaxed ) ) break;
auto& ring = ringArray[i];
const auto head = ring.LoadHead();
const auto tail = ring.GetTail();
if( head == tail ) continue;
assert( head > tail );
hadData = true;
const auto id = ring.GetId();
assert( id != EventContextSwitch );
const auto end = head - tail;
uint64_t pos = 0;
if( id == EventCallstack )
{
while( pos < end )
{
perf_event_header hdr;
ring.Read( &hdr, pos, sizeof( perf_event_header ) );
if( hdr.type == PERF_RECORD_SAMPLE )
{
auto offset = pos + sizeof( perf_event_header );
// Layout:
// u32 pid, tid
// u64 time
// u64 cnt
// u64 ip[cnt]
uint32_t tid;
uint64_t t0;
uint64_t cnt;
offset += sizeof( uint32_t );
ring.Read( &tid, offset, sizeof( uint32_t ) );
offset += sizeof( uint32_t );
ring.Read( &t0, offset, sizeof( uint64_t ) );
offset += sizeof( uint64_t );
ring.Read( &cnt, offset, sizeof( uint64_t ) );
offset += sizeof( uint64_t );
if( cnt > 0 )
{
#if defined TRACY_HW_TIMER && ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
t0 = ring.ConvertTimeToTsc( t0 );
#endif
auto trace = GetCallstackBlock( cnt, ring, offset );
TracyLfqPrepare( QueueType::CallstackSample );
MemWrite( &item->callstackSampleFat.time, t0 );
MemWrite( &item->callstackSampleFat.thread, tid );
MemWrite( &item->callstackSampleFat.ptr, (uint64_t)trace );
TracyLfqCommit;
}
}
pos += hdr.size;
}
}
else
{
while( pos < end )
{
perf_event_header hdr;
ring.Read( &hdr, pos, sizeof( perf_event_header ) );
if( hdr.type == PERF_RECORD_SAMPLE )
{
auto offset = pos + sizeof( perf_event_header );
// Layout:
// u64 ip
// u64 time
uint64_t ip, t0;
ring.Read( &ip, offset, sizeof( uint64_t ) );
offset += sizeof( uint64_t );
ring.Read( &t0, offset, sizeof( uint64_t ) );
#if defined TRACY_HW_TIMER && ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
t0 = ring.ConvertTimeToTsc( t0 );
#endif
QueueType type;
switch( id )
{
case EventCpuCycles:
type = QueueType::HwSampleCpuCycle;
break;
case EventInstructionsRetired:
type = QueueType::HwSampleInstructionRetired;
break;
case EventCacheReference:
type = QueueType::HwSampleCacheReference;
break;
case EventCacheMiss:
type = QueueType::HwSampleCacheMiss;
break;
case EventBranchRetired:
type = QueueType::HwSampleBranchRetired;
break;
case EventBranchMiss:
type = QueueType::HwSampleBranchMiss;
break;
default:
abort();
}
TracyLfqPrepare( type );
MemWrite( &item->hwSample.ip, ip );
MemWrite( &item->hwSample.time, t0 );
TracyLfqCommit;
}
pos += hdr.size;
}
}
assert( pos == end );
ring.Advance( end );
}
if( !traceActive.load( std::memory_order_relaxed ) ) break;
if( ctxBufferIdx != numBuffers )
{
const auto ctxBufNum = numBuffers - ctxBufferIdx;
int activeNum = 0;
uint16_t active[512];
uint32_t end[512];
uint32_t pos[512];
for( int i=0; i<ctxBufNum; i++ )
{
const auto rbIdx = ctxBufferIdx + i;
const auto rbHead = ringArray[rbIdx].LoadHead();
const auto rbTail = ringArray[rbIdx].GetTail();
const auto rbActive = rbHead != rbTail;
if( rbActive )
{
active[activeNum] = (uint16_t)i;
activeNum++;
end[i] = rbHead - rbTail;
pos[i] = 0;
}
else
{
end[i] = 0;
}
}
if( activeNum > 0 )
{
hadData = true;
while( activeNum > 0 )
{
int sel = -1;
int selPos;
int64_t t0 = std::numeric_limits<int64_t>::max();
for( int i=0; i<activeNum; i++ )
{
auto idx = active[i];
auto rbPos = pos[idx];
assert( rbPos < end[idx] );
const auto rbIdx = ctxBufferIdx + idx;
perf_event_header hdr;
ringArray[rbIdx].Read( &hdr, rbPos, sizeof( perf_event_header ) );
if( hdr.type == PERF_RECORD_SAMPLE )
{
int64_t rbTime;
ringArray[rbIdx].Read( &rbTime, rbPos + sizeof( perf_event_header ), sizeof( int64_t ) );
if( rbTime < t0 )
{
t0 = rbTime;
sel = idx;
selPos = i;
}
}
else
{
rbPos += hdr.size;
if( rbPos == end[idx] )
{
memmove( active+i, active+i+1, sizeof(*active) * ( activeNum - i - 1 ) );
activeNum--;
i--;
}
else
{
pos[idx] = rbPos;
}
}
}
if( sel >= 0 )
{
auto& ring = ringArray[ctxBufferIdx + sel];
auto rbPos = pos[sel];
auto offset = rbPos;
perf_event_header hdr;
ring.Read( &hdr, offset, sizeof( perf_event_header ) );
#if defined TRACY_HW_TIMER && ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
t0 = ring.ConvertTimeToTsc( t0 );
#endif
const auto rid = ring.GetId();
if( rid == EventContextSwitch )
{
// Layout:
// u64 time
// u64 cnt
// u64 ip[cnt]
// u32 size
// u8 data[size]
// Data (not ABI stable, but has not changed since it was added, in 2009):
// u8 hdr[8]
// u8 prev_comm[16]
// u32 prev_pid
// u32 prev_prio
// lng prev_state
// u8 next_comm[16]
// u32 next_pid
// u32 next_prio
offset += sizeof( perf_event_header ) + sizeof( uint64_t );
uint64_t cnt;
ring.Read( &cnt, offset, sizeof( uint64_t ) );
offset += sizeof( uint64_t );
const auto traceOffset = offset;
offset += sizeof( uint64_t ) * cnt + sizeof( uint32_t ) + 8 + 16;
uint32_t prev_pid, next_pid;
long prev_state;
ring.Read( &prev_pid, offset, sizeof( uint32_t ) );
offset += sizeof( uint32_t ) + sizeof( uint32_t );
ring.Read( &prev_state, offset, sizeof( long ) );
offset += sizeof( long ) + 16;
ring.Read( &next_pid, offset, sizeof( uint32_t ) );
uint8_t reason = 100;
uint8_t state;
if( prev_state & 0x0001 ) state = 104;
else if( prev_state & 0x0002 ) state = 101;
else if( prev_state & 0x0004 ) state = 105;
else if( prev_state & 0x0008 ) state = 106;
else if( prev_state & 0x0010 ) state = 108;
else if( prev_state & 0x0020 ) state = 109;
else if( prev_state & 0x0040 ) state = 110;
else if( prev_state & 0x0080 ) state = 102;
else state = 103;
TracyLfqPrepare( QueueType::ContextSwitch );
MemWrite( &item->contextSwitch.time, t0 );
MemWrite( &item->contextSwitch.oldThread, prev_pid );
MemWrite( &item->contextSwitch.newThread, next_pid );
MemWrite( &item->contextSwitch.cpu, uint8_t( ring.GetCpu() ) );
MemWrite( &item->contextSwitch.reason, reason );
MemWrite( &item->contextSwitch.state, state );
TracyLfqCommit;
if( cnt > 0 && prev_pid != 0 && CurrentProcOwnsThread( prev_pid ) )
{
auto trace = GetCallstackBlock( cnt, ring, traceOffset );
TracyLfqPrepare( QueueType::CallstackSampleContextSwitch );
MemWrite( &item->callstackSampleFat.time, t0 );
MemWrite( &item->callstackSampleFat.thread, prev_pid );
MemWrite( &item->callstackSampleFat.ptr, (uint64_t)trace );
TracyLfqCommit;
}
}
else if( rid == EventWakeup )
{
// Layout:
// u64 time
// u32 size
// u8 data[size]
// Data:
// u8 hdr[8]
// u8 comm[16]
// u32 pid
// u32 prio
// u64 target_cpu
offset += sizeof( perf_event_header ) + sizeof( uint64_t ) + sizeof( uint32_t ) + 8 + 16;
uint32_t pid;
ring.Read( &pid, offset, sizeof( uint32_t ) );
TracyLfqPrepare( QueueType::ThreadWakeup );
MemWrite( &item->threadWakeup.time, t0 );
MemWrite( &item->threadWakeup.thread, pid );
TracyLfqCommit;
}
else
{
assert( rid == EventVsync );
// Layout:
// u64 time
// u32 size
// u8 data[size]
// Data (not ABI stable):
// u8 hdr[8]
// i32 crtc
// u32 seq
// i64 ktime
// u8 high precision
offset += sizeof( perf_event_header ) + sizeof( uint64_t ) + sizeof( uint32_t ) + 8;
int32_t crtc;
ring.Read( &crtc, offset, sizeof( int32_t ) );
// Note: The timestamp value t0 might be off by a number of microseconds from the
// true hardware vblank event. The ktime value should be used instead, but it is
// measured in CLOCK_MONOTONIC time. Tracy only supports the timestamp counter
// register (TSC) or CLOCK_MONOTONIC_RAW clock.
#if 0
offset += sizeof( uint32_t ) * 2;
int64_t ktime;
ring.Read( &ktime, offset, sizeof( int64_t ) );
#endif
TracyLfqPrepare( QueueType::FrameVsync );
MemWrite( &item->frameVsync.id, crtc );
MemWrite( &item->frameVsync.time, t0 );
TracyLfqCommit;
}
rbPos += hdr.size;
if( rbPos == end[sel] )
{
memmove( active+selPos, active+selPos+1, sizeof(*active) * ( activeNum - selPos - 1 ) );
activeNum--;
}
else
{
pos[sel] = rbPos;
}
}
}
for( int i=0; i<ctxBufNum; i++ )
{
if( end[i] != 0 ) ringArray[ctxBufferIdx + i].Advance( end[i] );
}
}
}
if( !traceActive.load( std::memory_order_relaxed ) ) break;
if( !hadData )
{
std::this_thread::sleep_for( std::chrono::milliseconds( 1 ) );
}
}
for( int i=0; i<numBuffers; i++ ) ringArray[i].~RingBuffer();
tracy_free_fast( ringArray );
}
void SysTraceGetExternalName( uint64_t thread, const char*& threadName, const char*& name )
{
FILE* f;
char fn[256];
sprintf( fn, "/proc/%" PRIu64 "/comm", thread );
f = fopen( fn, "rb" );
if( f )
{
char buf[256];
const auto sz = fread( buf, 1, 256, f );
if( sz > 0 && buf[sz-1] == '\n' ) buf[sz-1] = '\0';
threadName = CopyString( buf );
fclose( f );
}
else
{
threadName = CopyString( "???", 3 );
}
sprintf( fn, "/proc/%" PRIu64 "/status", thread );
f = fopen( fn, "rb" );
if( f )
{
char* tmp = (char*)tracy_malloc_fast( 8*1024 );
const auto fsz = (ptrdiff_t)fread( tmp, 1, 8*1024, f );
fclose( f );
int pid = -1;
auto line = tmp;
for(;;)
{
if( memcmp( "Tgid:\t", line, 6 ) == 0 )
{
pid = atoi( line + 6 );
break;
}
while( line - tmp < fsz && *line != '\n' ) line++;
if( *line != '\n' ) break;
line++;
}
tracy_free_fast( tmp );
if( pid >= 0 )
{
{
uint64_t _pid = pid;
TracyLfqPrepare( QueueType::TidToPid );
MemWrite( &item->tidToPid.tid, thread );
MemWrite( &item->tidToPid.pid, _pid );
TracyLfqCommit;
}
sprintf( fn, "/proc/%i/comm", pid );
f = fopen( fn, "rb" );
if( f )
{
char buf[256];
const auto sz = fread( buf, 1, 256, f );
if( sz > 0 && buf[sz-1] == '\n' ) buf[sz-1] = '\0';
name = CopyStringFast( buf );
fclose( f );
return;
}
}
}
name = CopyStringFast( "???", 3 );
}
}
# endif
#endif
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