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Trace thread wakeups on linux.

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Bartosz Taudul 2019-08-17 17:17:54 +02:00
parent 580944af65
commit f7589bde02
1 changed files with 48 additions and 26 deletions
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74
client/TracySysTrace.cpp
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@ -269,6 +269,7 @@ static const char CurrentTracer[] = "current_tracer";
static const char TraceOptions[] = "trace_options";
static const char TraceClock[] = "trace_clock";
static const char SchedSwitch[] = "events/sched/sched_switch/enable";
static const char SchedWakeup[] = "events/sched/sched_wakeup/enable";
static const char TracePipe[] = "trace_pipe";
static bool TraceWrite( const char* path, size_t psz, const char* val, size_t vsz )
@ -311,6 +312,7 @@ bool SysTraceStart()
if( !TraceWrite( TraceClock, sizeof( TraceClock ), "mono_raw", 8 ) ) return false;
#endif
if( !TraceWrite( SchedSwitch, sizeof( SchedSwitch ), "1", 2 ) ) return false;
if( !TraceWrite( SchedWakeup, sizeof( SchedWakeup ), "1", 2 ) ) return false;
if( !TraceWrite( TracingOn, sizeof( TracingOn ), "1", 2 ) ) return false;
return true;
@ -392,40 +394,60 @@ void SysTraceWorker( void* ptr )
#endif
ptr += 2; // ': '
if( memcmp( ptr, "sched_switch", 12 ) != 0 ) continue;
ptr += 14;
if( memcmp( ptr, "sched_switch", 12 ) == 0 )
{
ptr += 14;
while( memcmp( ptr, "prev_pid", 8 ) != 0 ) ptr++;
ptr += 9;
while( memcmp( ptr, "prev_pid", 8 ) != 0 ) ptr++;
ptr += 9;
const auto oldPid = ReadNumber( ptr );
ptr++;
const auto oldPid = ReadNumber( ptr );
ptr++;
while( memcmp( ptr, "prev_state", 10 ) != 0 ) ptr++;
ptr += 11;
while( memcmp( ptr, "prev_state", 10 ) != 0 ) ptr++;
ptr += 11;
const auto oldState = (uint8_t)ReadState( *ptr );
ptr += 5;
const auto oldState = (uint8_t)ReadState( *ptr );
ptr += 5;
while( memcmp( ptr, "next_pid", 8 ) != 0 ) ptr++;
ptr += 9;
while( memcmp( ptr, "next_pid", 8 ) != 0 ) ptr++;
ptr += 9;
const auto newPid = ReadNumber( ptr );
const auto newPid = ReadNumber( ptr );
uint8_t reason = 100;
uint8_t reason = 100;
Magic magic;
auto token = GetToken();
auto& tail = token->get_tail_index();
auto item = token->enqueue_begin( magic );
MemWrite( &item->hdr.type, QueueType::ContextSwitch );
MemWrite( &item->contextSwitch.time, time );
MemWrite( &item->contextSwitch.oldThread, oldPid );
MemWrite( &item->contextSwitch.newThread, newPid );
MemWrite( &item->contextSwitch.cpu, cpu );
MemWrite( &item->contextSwitch.reason, reason );
MemWrite( &item->contextSwitch.state, oldState );
tail.store( magic + 1, std::memory_order_release );
Magic magic;
auto token = GetToken();
auto& tail = token->get_tail_index();
auto item = token->enqueue_begin( magic );
MemWrite( &item->hdr.type, QueueType::ContextSwitch );
MemWrite( &item->contextSwitch.time, time );
MemWrite( &item->contextSwitch.oldThread, oldPid );
MemWrite( &item->contextSwitch.newThread, newPid );
MemWrite( &item->contextSwitch.cpu, cpu );
MemWrite( &item->contextSwitch.reason, reason );
MemWrite( &item->contextSwitch.state, oldState );
tail.store( magic + 1, std::memory_order_release );
}
else if( memcmp( ptr, "sched_wakeup", 12 ) == 0 )
{
ptr += 14;
while( memcmp( ptr, "pid", 3 ) != 0 ) ptr++;
ptr += 4;
const auto pid = ReadNumber( ptr );
Magic magic;
auto token = GetToken();
auto& tail = token->get_tail_index();
auto item = token->enqueue_begin( magic );
MemWrite( &item->hdr.type, QueueType::ThreadWakeup );
MemWrite( &item->threadWakeup.time, time );
MemWrite( &item->threadWakeup.thread, pid );
tail.store( magic + 1, std::memory_order_release );
}
}
free( line );