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linux: respect TRACY_NO_SAMPLING
for sys-tracing
This compile-time flag was being ignored on Linux. This change adds gating for software-sampled stack trace sampling following the same pattern as other `TRACY_NO_SAMPLE_*` options. If `TRACY_NO_SAMPLING=1` is provided as an environment variable, software stack sampling is also disabled.
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@ -770,6 +770,13 @@ bool SysTraceStart( int64_t& samplingPeriod )
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TracyDebug( "sched_wakeup id: %i\n", wakeupId );
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TracyDebug( "drm_vblank_event id: %i\n", vsyncId );
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#ifdef TRACY_NO_SAMPLING
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const bool noSoftwareSampling = true;
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#else
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const char* noSoftwareSamplingEnv = GetEnvVar( "TRACY_NO_SAMPLING" );
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const bool noSoftwareSampling = noSoftwareSamplingEnv && noSoftwareSamplingEnv[0] == '1';
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#endif
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#ifdef TRACY_NO_SAMPLE_RETIREMENT
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const bool noRetirement = true;
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#else
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@ -839,28 +846,31 @@ bool SysTraceStart( int64_t& samplingPeriod )
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pe.clockid = CLOCK_MONOTONIC_RAW;
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#endif
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TracyDebug( "Setup software sampling\n" );
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ProbePreciseIp( pe, currentPid );
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for( int i=0; i<s_numCpus; i++ )
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if( !noSoftwareSampling )
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{
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int fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
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if( fd == -1 )
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TracyDebug( "Setup software sampling\n" );
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ProbePreciseIp( pe, currentPid );
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for( int i=0; i<s_numCpus; i++ )
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{
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pe.exclude_kernel = 1;
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ProbePreciseIp( pe, currentPid );
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fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
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int fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
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if( fd == -1 )
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{
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TracyDebug( " Failed to setup!\n");
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break;
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pe.exclude_kernel = 1;
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ProbePreciseIp( pe, currentPid );
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fd = perf_event_open( &pe, currentPid, i, -1, PERF_FLAG_FD_CLOEXEC );
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if( fd == -1 )
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{
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TracyDebug( " Failed to setup!\n");
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break;
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}
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TracyDebug( " No access to kernel samples\n" );
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}
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new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventCallstack );
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if( s_ring[s_numBuffers].IsValid() )
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{
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s_numBuffers++;
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TracyDebug( " Core %i ok\n", i );
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}
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TracyDebug( " No access to kernel samples\n" );
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}
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new( s_ring+s_numBuffers ) RingBuffer( 64*1024, fd, EventCallstack );
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if( s_ring[s_numBuffers].IsValid() )
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{
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s_numBuffers++;
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TracyDebug( " Core %i ok\n", i );
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}
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}
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