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Sleep if sys trace pipe buffer underruns.

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Bartosz Taudul 2019-08-24 00:42:00 +02:00
parent 2d50d07438
commit 8f6e94d75c
1 changed files with 141 additions and 74 deletions
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215
client/TracySysTrace.cpp
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@ -506,96 +506,145 @@ ssize_t getline(char **buf, size_t *bufsiz, FILE *fp)
} }
#endif #endif
static void ProcessTraceLines( FILE* f ) static void HandleTraceLine( const char* line )
{ {
size_t lsz = 1024; line += 24;
auto line = (char*)malloc( lsz ); const auto cpu = (uint8_t)ReadNumber( line );
for(;;) line++; // ']'
{ while( *line == ' ' ) line++;
auto rd = getline( &line, &lsz, f );
if( rd < 0 ) break;
#ifdef TRACY_ON_DEMAND
if( !GetProfiler().IsConnected() ) continue;
#endif
const char* ptr = line + 24;
const auto cpu = (uint8_t)ReadNumber( ptr );
ptr++; // ']'
while( *ptr == ' ' ) ptr++;
#if defined TRACY_HW_TIMER && ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 ) #if defined TRACY_HW_TIMER && ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
const auto time = ReadNumber( ptr ); const auto time = ReadNumber( line );
#elif __ARM_ARCH >= 6 #elif __ARM_ARCH >= 6
const auto ts = ReadNumber( ptr ); const auto ts = ReadNumber( line );
ptr++; // '.' line++; // '.'
const auto tus = ReadNumber( ptr ); const auto tus = ReadNumber( line );
const auto time = ts * 1000000000ll + tus * 1000ll; const auto time = ts * 1000000000ll + tus * 1000ll;
#endif #endif
ptr += 2; // ': ' line += 2; // ': '
if( memcmp( ptr, "sched_switch", 12 ) == 0 ) if( memcmp( line, "sched_switch", 12 ) == 0 )
{ {
ptr += 14; line += 14;
while( memcmp( ptr, "prev_pid", 8 ) != 0 ) ptr++; while( memcmp( line, "prev_pid", 8 ) != 0 ) line++;
ptr += 9; line += 9;
const auto oldPid = ReadNumber( ptr ); const auto oldPid = ReadNumber( line );
ptr++; line++;
while( memcmp( ptr, "prev_state", 10 ) != 0 ) ptr++; while( memcmp( line, "prev_state", 10 ) != 0 ) line++;
ptr += 11; line += 11;
const auto oldState = (uint8_t)ReadState( *ptr ); const auto oldState = (uint8_t)ReadState( *line );
ptr += 5; line += 5;
while( memcmp( ptr, "next_pid", 8 ) != 0 ) ptr++; while( memcmp( line, "next_pid", 8 ) != 0 ) line++;
ptr += 9; line += 9;
const auto newPid = ReadNumber( ptr ); const auto newPid = ReadNumber( line );
uint8_t reason = 100; uint8_t reason = 100;
Magic magic; Magic magic;
auto token = GetToken(); auto token = GetToken();
auto& tail = token->get_tail_index(); auto& tail = token->get_tail_index();
auto item = token->enqueue_begin( magic ); auto item = token->enqueue_begin( magic );
MemWrite( &item->hdr.type, QueueType::ContextSwitch ); MemWrite( &item->hdr.type, QueueType::ContextSwitch );
MemWrite( &item->contextSwitch.time, time ); MemWrite( &item->contextSwitch.time, time );
MemWrite( &item->contextSwitch.oldThread, oldPid ); MemWrite( &item->contextSwitch.oldThread, oldPid );
MemWrite( &item->contextSwitch.newThread, newPid ); MemWrite( &item->contextSwitch.newThread, newPid );
MemWrite( &item->contextSwitch.cpu, cpu ); MemWrite( &item->contextSwitch.cpu, cpu );
MemWrite( &item->contextSwitch.reason, reason ); MemWrite( &item->contextSwitch.reason, reason );
MemWrite( &item->contextSwitch.state, oldState ); MemWrite( &item->contextSwitch.state, oldState );
tail.store( magic + 1, std::memory_order_release ); 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 );
}
} }
else if( memcmp( line, "sched_wakeup", 12 ) == 0 )
{
line += 14;
free( line ); while( memcmp( line, "pid", 3 ) != 0 ) line++;
line += 4;
const auto pid = ReadNumber( line );
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 );
}
} }
#ifdef __ANDROID__ #ifdef __ANDROID__
static void ProcessTraceLines( int fd )
{
// Linux pipe buffer is 64KB, additional 1KB is for unfinished lines
char* buf = (char*)tracy_malloc( (64+1)*1024 );
char* line = buf;
for(;;)
{
const auto rd = read( fd, line, 64*1024 );
if( rd <= 0 ) break;
#ifdef TRACY_ON_DEMAND
if( !GetProfiler().IsConnected() )
{
if( rd < 64*1024 )
{
assert( line[rd-1] == '\n' );
line = buf;
std::this_thread::sleep_for( std::chrono::milliseconds( 10 ) );
}
else
{
const auto end = line + rd;
line = end - 1;
while( line > buf && *line != '\n' ) line--;
if( line > buf )
{
line++;
const auto lsz = end - line;
memmove( buf, line, lsz );
line = buf + lsz;
}
}
continue;
}
#endif
const auto end = line + rd;
line = buf;
for(;;)
{
auto next = line;
while( next < end && *next != '\n' ) next++;
next++;
if( next >= end )
{
const auto lsz = end - line;
memmove( buf, line, lsz );
line = buf + lsz;
break;
}
HandleTraceLine( line );
line = next;
}
if( rd < 64*1024 )
{
std::this_thread::sleep_for( std::chrono::milliseconds( 10 ) );
}
}
tracy_free( buf );
}
void SysTraceWorker( void* ptr ) void SysTraceWorker( void* ptr )
{ {
SetThreadName( "Tracy SysTrace" ); SetThreadName( "Tracy SysTrace" );
@ -619,14 +668,32 @@ void SysTraceWorker( void* ptr )
{ {
// parent // parent
close( pipefd[1] ); close( pipefd[1] );
FILE* f = fdopen( pipefd[0], "rb" ); ProcessTraceLines( pipefd[0] );
if( !f ) return; close( pipefd[0] );
ProcessTraceLines( f );
fclose( f );
} }
} }
} }
#else #else
static void ProcessTraceLines( FILE* f )
{
size_t lsz = 1024;
auto line = (char*)malloc( lsz );
for(;;)
{
auto rd = getline( &line, &lsz, f );
if( rd < 0 ) break;
#ifdef TRACY_ON_DEMAND
if( !GetProfiler().IsConnected() ) continue;
#endif
HandleTraceLine( line );
}
free( line );
}
void SysTraceWorker( void* ptr ) void SysTraceWorker( void* ptr )
{ {
SetThreadName( "Tracy SysTrace" ); SetThreadName( "Tracy SysTrace" );