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Precise_ip should be shared in each pair of counters.

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This commit is contained in:
Bartosz Taudul 2021-05-22 02:16:49 +02:00
parent fef507dfa2
commit 089eda0be9
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GPG Key ID: B7FE2008B7575DF3
1 changed files with 25 additions and 34 deletions
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59
client/TracySysTrace.cpp
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@ -689,8 +689,9 @@ enum TraceEventId
EventBranchMiss
};
static void ProbePreciseIp( perf_event_attr& pe )
static void ProbePreciseIp( perf_event_attr& pe, unsigned long long config0, unsigned long long config1 )
{
pe.config = config1;
pe.precise_ip = 3;
while( pe.precise_ip != 0 )
{
@ -702,6 +703,17 @@ static void ProbePreciseIp( perf_event_attr& pe )
}
pe.precise_ip--;
}
pe.config = config0;
while( pe.precise_ip != 0 )
{
const int fd = perf_event_open( &pe, -1, 0, -1, PERF_FLAG_FD_CLOEXEC );
if( fd != -1 )
{
close( fd );
break;
}
pe.precise_ip--;
}
TracyDebug( " Probed precise_ip: %i\n", pe.precise_ip );
}
@ -769,11 +781,10 @@ static void SetupSampling( int64_t& samplingPeriod )
s_numBuffers++;
}
// CPU cycles
// CPU cycles + instructions retired
pe = {};
pe.type = PERF_TYPE_HARDWARE;
pe.size = sizeof( perf_event_attr );
pe.config = PERF_COUNT_HW_CPU_CYCLES;
pe.sample_freq = 5*1000*1000;
pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
pe.disabled = 1;
@ -781,8 +792,8 @@ static void SetupSampling( int64_t& samplingPeriod )
pe.exclude_idle = 1;
if( !noRetirement )
{
TracyDebug( "Setup sampling CPU cycles\n" );
ProbePreciseIp( pe );
TracyDebug( "Setup sampling cycles + retirement\n" );
ProbePreciseIp( pe, PERF_COUNT_HW_CPU_CYCLES, PERF_COUNT_HW_INSTRUCTIONS );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
@ -793,14 +804,8 @@ static void SetupSampling( int64_t& samplingPeriod )
TracyDebug( " Core %i ok\n", i );
}
}
}
// Instructions retired
pe.config = PERF_COUNT_HW_INSTRUCTIONS;
if( !noRetirement )
{
TracyDebug( "Setup sampling CPU instruction retirements\n" );
ProbePreciseIp( pe );
pe.config = PERF_COUNT_HW_INSTRUCTIONS;
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
@ -813,12 +818,11 @@ static void SetupSampling( int64_t& samplingPeriod )
}
}
// cache reference
pe.config = PERF_COUNT_HW_CACHE_REFERENCES;
// cache reference + miss
if( !noCache )
{
TracyDebug( "Setup sampling CPU cache references\n" );
ProbePreciseIp( pe );
TracyDebug( "Setup sampling CPU cache references + misses\n" );
ProbePreciseIp( pe, PERF_COUNT_HW_CACHE_REFERENCES, PERF_COUNT_HW_CACHE_MISSES );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
@ -829,14 +833,8 @@ static void SetupSampling( int64_t& samplingPeriod )
TracyDebug( " Core %i ok\n", i );
}
}
}
// cache miss
pe.config = PERF_COUNT_HW_CACHE_MISSES;
if( !noCache )
{
TracyDebug( "Setup sampling CPU cache misses\n" );
ProbePreciseIp( pe );
pe.config = PERF_COUNT_HW_CACHE_MISSES;
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
@ -849,12 +847,11 @@ static void SetupSampling( int64_t& samplingPeriod )
}
}
// branch retired
pe.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
// branch retired + miss
if( !noBranch )
{
TracyDebug( "Setup sampling CPU branch retirements\n" );
ProbePreciseIp( pe );
TracyDebug( "Setup sampling CPU branch retirements + misses\n" );
ProbePreciseIp( pe, PERF_COUNT_HW_BRANCH_INSTRUCTIONS, PERF_COUNT_HW_BRANCH_MISSES );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
@ -865,14 +862,8 @@ static void SetupSampling( int64_t& samplingPeriod )
TracyDebug( " Core %i ok\n", i );
}
}
}
// branch miss
pe.config = PERF_COUNT_HW_BRANCH_MISSES;
if( !noBranch )
{
TracyDebug( "Setup sampling CPU branch misses\n" );
ProbePreciseIp( pe );
pe.config = PERF_COUNT_HW_BRANCH_MISSES;
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );