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Probe for acceptable precise_ip value.

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This is stupid, but it's exactly what perf does... Sigh.
This commit is contained in:
Bartosz Taudul 2021-05-21 01:32:45 +02:00
parent ea5a9ee83b
commit 4d668741eb
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GPG Key ID: B7FE2008B7575DF3
1 changed files with 21 additions and 1 deletions
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22
client/TracySysTrace.cpp
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@ -688,6 +688,21 @@ enum TraceEventId
EventBranchMiss
};
static void ProbePreciseIp( perf_event_attr& pe )
{
pe.precise_ip = 3;
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--;
}
}
static void SetupSampling( int64_t& samplingPeriod )
{
#ifndef CLOCK_MONOTONIC_RAW
@ -762,9 +777,9 @@ static void SetupSampling( int64_t& samplingPeriod )
pe.disabled = 1;
pe.exclude_kernel = 1;
pe.exclude_idle = 1;
pe.precise_ip = 2;
if( !noRetirement )
{
ProbePreciseIp( pe );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
@ -780,6 +795,7 @@ static void SetupSampling( int64_t& samplingPeriod )
pe.config = PERF_COUNT_HW_INSTRUCTIONS;
if( !noRetirement )
{
ProbePreciseIp( pe );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
@ -795,6 +811,7 @@ static void SetupSampling( int64_t& samplingPeriod )
pe.config = PERF_COUNT_HW_CACHE_REFERENCES;
if( !noCache )
{
ProbePreciseIp( pe );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
@ -810,6 +827,7 @@ static void SetupSampling( int64_t& samplingPeriod )
pe.config = PERF_COUNT_HW_CACHE_MISSES;
if( !noCache )
{
ProbePreciseIp( pe );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
@ -825,6 +843,7 @@ static void SetupSampling( int64_t& samplingPeriod )
pe.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
if( !noBranch )
{
ProbePreciseIp( pe );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );
@ -840,6 +859,7 @@ static void SetupSampling( int64_t& samplingPeriod )
pe.config = PERF_COUNT_HW_BRANCH_MISSES;
if( !noBranch )
{
ProbePreciseIp( pe );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, -1, i, -1, PERF_FLAG_FD_CLOEXEC );