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Probe precise_ip for software sampling.

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Bartosz Taudul 2021-06-13 01:21:09 +02:00
parent 2d2a5c92fd
commit 698e5f0210
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GPG Key ID: B7FE2008B7575DF3
1 changed files with 18 additions and 0 deletions
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18
client/TracySysTrace.cpp
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@ -721,6 +721,22 @@ static void ProbePreciseIp( perf_event_attr& pe, unsigned long long config0, uns
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__
@ -788,6 +804,8 @@ static void SetupSampling( int64_t& samplingPeriod )
pe.clockid = CLOCK_MONOTONIC_RAW;
#endif
TracyDebug( "Setup software sampling\n" );
ProbePreciseIp( pe, currentPid );
for( int i=0; i<s_numCpus; i++ )
{
const int fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );