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Allow control of sampling frequency.

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Bartosz Taudul 2021-05-11 18:31:20 +02:00
parent 05b5f1cfe1
commit 42a272edf5
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GPG Key ID: B7FE2008B7575DF3
1 changed files with 36 additions and 4 deletions
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40
client/TracySysTrace.cpp
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@ -2,6 +2,33 @@
#ifdef TRACY_HAS_SYSTEM_TRACING
#ifndef TRACY_SAMPLING_HZ
# if defined _WIN32 || defined __CYGWIN__
# define TRACY_SAMPLING_HZ 8000
# elif defined __linux__
# define TRACY_SAMPLING_HZ 10000
# endif
#endif
namespace tracy
{
static constexpr int GetSamplingFrequency()
{
#if defined _WIN32 || defined __CYGWIN__
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 || defined __CYGWIN__
# ifndef NOMINMAX
@ -330,6 +357,11 @@ static void SetupVsync()
#endif
}
static constexpr int GetSamplingInterval()
{
return GetSamplingPeriod() / 100;
}
bool SysTraceStart( int64_t& samplingPeriod )
{
if( !_GetThreadDescription ) _GetThreadDescription = (t_GetThreadDescription)GetProcAddress( GetModuleHandleA( "kernel32.dll" ), "GetThreadDescription" );
@ -360,10 +392,10 @@ bool SysTraceStart( int64_t& samplingPeriod )
if( isOs64Bit )
{
TRACE_PROFILE_INTERVAL interval = {};
interval.Interval = 1250; // 8 kHz
interval.Interval = GetSamplingInterval();
const auto intervalStatus = TraceSetInformation( 0, TraceSampledProfileIntervalInfo, &interval, sizeof( interval ) );
if( intervalStatus != ERROR_SUCCESS ) return false;
samplingPeriod = 125*1000;
samplingPeriod = GetSamplingPeriod();
}
const auto psz = sizeof( EVENT_TRACE_PROPERTIES ) + sizeof( KERNEL_LOGGER_NAME );
@ -649,7 +681,7 @@ static void SetupSampling( int64_t& samplingPeriod )
return;
#endif
samplingPeriod = 100*1000;
samplingPeriod = GetSamplingPeriod();
s_numCpus = (int)std::thread::hardware_concurrency();
s_ring = (RingBuffer<RingBufSize>*)tracy_malloc( sizeof( RingBuffer<RingBufSize> ) * s_numCpus );
@ -660,7 +692,7 @@ static void SetupSampling( int64_t& samplingPeriod )
pe.size = sizeof( perf_event_attr );
pe.config = PERF_COUNT_SW_CPU_CLOCK;
pe.sample_freq = 10000;
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;