Store sampling period.

client/TracyProfiler.cpp

@@ -1024,6 +1024,7 @@ Profiler::Profiler()
     , m_broadcast( nullptr )
     , m_noExit( false )
     , m_zoneId( 1 )
+    , m_samplingPeriod( 0 )
     , m_stream( LZ4_createStream() )
     , m_buffer( (char*)tracy_malloc( TargetFrameSize*3 ) )
     , m_bufferOffset( 0 )
@@ -1072,7 +1073,7 @@ Profiler::Profiler()
     new(s_compressThread) Thread( LaunchCompressWorker, this );
 
 #ifdef TRACY_HAS_SYSTEM_TRACING
-    if( SysTraceStart() )
+    if( SysTraceStart( m_samplingPeriod ) )
     {
         s_sysTraceThread = (Thread*)tracy_malloc( sizeof( Thread ) );
         new(s_sysTraceThread) Thread( SysTraceWorker, nullptr );

client/TracyProfiler.hpp

@@ -619,6 +619,7 @@ private:
     UdpBroadcast* m_broadcast;
     bool m_noExit;
     std::atomic<uint32_t> m_zoneId;
+    int64_t m_samplingPeriod;
 
     uint64_t m_threadCtx;
     int64_t m_refTimeThread;

client/TracySysTrace.cpp

@@ -160,7 +160,7 @@ void WINAPI EventRecordCallback( PEVENT_RECORD record )
     }
 }
 
-bool SysTraceStart()
+bool SysTraceStart( int64_t& samplingPeriod )
 {
     s_pid = GetCurrentProcessId();
 
@@ -191,6 +191,7 @@ bool SysTraceStart()
         interval.Interval = 1250;   // 8 kHz
         const auto intervalStatus = TraceSetInformation( 0, TraceSampledProfileIntervalInfo, &interval, sizeof( interval ) );
         if( intervalStatus != ERROR_SUCCESS ) return false;
+        samplingPeriod = 125*1000;
     }
 
     const auto psz = sizeof( EVENT_TRACE_PROPERTIES ) + sizeof( KERNEL_LOGGER_NAME );
@@ -523,7 +524,7 @@ void SysTraceInjectPayload()
 }
 #endif
 
-bool SysTraceStart()
+bool SysTraceStart( int64_t& samplingPeriod )
 {
     if( !TraceWrite( TracingOn, sizeof( TracingOn ), "0", 2 ) ) return false;
     if( !TraceWrite( CurrentTracer, sizeof( CurrentTracer ), "nop", 4 ) ) return false;

client/TracySysTrace.hpp

@@ -12,7 +12,7 @@
 namespace tracy
 {
 
-bool SysTraceStart();
+bool SysTraceStart( int64_t& samplingPeriod );
 void SysTraceStop();
 void SysTraceWorker( void* ptr );