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Collect context switch callstack on Linux.

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This commit is contained in:
Bartosz Taudul 2021-12-21 13:59:16 +01:00
parent 0c041795b6
commit 0ba2c0a86e
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GPG Key ID: B7FE2008B7575DF3
1 changed files with 25 additions and 2 deletions
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27
client/TracySysTrace.cpp
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@ -1051,7 +1051,10 @@ bool SysTraceStart( int64_t& samplingPeriod )
pe.type = PERF_TYPE_TRACEPOINT;
pe.size = sizeof( perf_event_attr );
pe.sample_period = 1;
pe.sample_type = PERF_SAMPLE_TIME | PERF_SAMPLE_RAW;
pe.sample_type = PERF_SAMPLE_TIME | PERF_SAMPLE_RAW | PERF_SAMPLE_CALLCHAIN;
#if LINUX_VERSION_CODE >= KERNEL_VERSION( 4, 8, 0 )
pe.sample_max_stack = 127;
#endif
pe.disabled = 1;
pe.inherit = 1;
pe.config = switchId;
@ -1075,6 +1078,7 @@ bool SysTraceStart( int64_t& samplingPeriod )
if( wakeupId != -1 )
{
pe.config = wakeupId;
pe.config &= ~PERF_SAMPLE_CALLCHAIN;
TracyDebug( "Setup wakeup capture\n" );
for( int i=0; i<s_numCpus; i++ )
@ -1340,6 +1344,8 @@ void SysTraceWorker( void* ptr )
{
// Layout:
// u64 time
// u64 cnt
// u64 ip[cnt]
// u32 size
// u8 data[size]
// Data (not ABI stable, but has not changed since it was added, in 2009):
@ -1352,7 +1358,13 @@ void SysTraceWorker( void* ptr )
// u32 next_pid
// u32 next_prio
offset += sizeof( perf_event_header ) + sizeof( uint64_t ) + sizeof( uint32_t ) + 8 + 16;
offset += sizeof( perf_event_header ) + sizeof( uint64_t );
uint64_t cnt;
ring.Read( &cnt, offset, sizeof( uint64_t ) );
offset += sizeof( uint64_t );
const auto traceOffset = offset;
offset += sizeof( uint64_t ) * cnt + sizeof( uint32_t ) + 8 + 16;
uint32_t prev_pid, next_pid;
uint64_t prev_state;
@ -1384,6 +1396,17 @@ void SysTraceWorker( void* ptr )
MemWrite( &item->contextSwitch.reason, reason );
MemWrite( &item->contextSwitch.state, state );
TracyLfqCommit;
if( cnt > 0 && prev_pid != 0 && CurrentProcOwnsThread( prev_pid ) )
{
auto trace = GetCallstackBlock( cnt, ring, traceOffset );
TracyLfqPrepare( QueueType::CallstackSample );
MemWrite( &item->callstackSampleFat.time, t0 );
MemWrite( &item->callstackSampleFat.thread, prev_pid );
MemWrite( &item->callstackSampleFat.ptr, (uint64_t)trace );
TracyLfqCommit;
}
}
else
{