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Retrieve tracefs mount path.

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This commit is contained in:
Bartosz Taudul
2025-10-25 21:06:37 +02:00
parent 3eda01d55f
commit b762dc2a82
1 changed files with 67 additions and 3 deletions
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70
public/client/TracySysTrace.cpp
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@@ -757,6 +757,64 @@ static const char* ReadFile( const char* path )
return tmp;
}
static const char* ReadFile( const char* base, const char* path )
{
const auto blen = strlen( base );
const auto plen = strlen( path );
auto tmp = (char*)tracy_malloc( blen + plen + 1 );
memcpy( tmp, base, blen );
memcpy( tmp + blen, path, plen );
tmp[blen+plen] = '\0';
auto res = ReadFile( tmp );
tracy_free( tmp );
return res;
}
static char* GetTraceFsPath()
{
int fd = open( "/proc/mounts", O_RDONLY );
if( fd < 0 ) return nullptr;
constexpr size_t BufSize = 64 * 1024;
auto tmp = (char*)tracy_malloc( BufSize );
const auto cnt = read( fd, tmp, BufSize-1 );
close( fd );
if( cnt < 0 )
{
tracy_free( tmp );
return nullptr;
}
tmp[cnt] = '\0';
auto ptr = tmp;
while( *ptr )
{
if( strncmp( ptr, "tracefs ", 8 ) == 0 )
{
ptr += 8;
auto end = ptr;
while( *end && *end != ' ' ) end++;
if( !*end )
{
tracy_free( tmp );
return nullptr;
}
const auto len = end - ptr;
auto ret = (char*)tracy_malloc( len+1 );
memcpy( ret, ptr, len );
ret[len] = '\0';
return ret;
}
while( *ptr && *ptr != '\n' ) ptr++;
if( *ptr ) ptr++;
}
tracy_free( tmp );
return nullptr;
}
bool SysTraceStart( int64_t& samplingPeriod )
{
#ifndef CLOCK_MONOTONIC_RAW
@@ -771,14 +829,20 @@ bool SysTraceStart( int64_t& samplingPeriod )
TracyDebug( "perf_event_paranoid: %i\n", paranoidLevel );
#endif
auto traceFsPath = GetTraceFsPath();
if( !traceFsPath ) return false;
TracyDebug( "tracefs path: %s\n", traceFsPath );
int switchId = -1, wakingId = -1, vsyncId = -1;
const auto switchIdStr = ReadFile( "/sys/kernel/debug/tracing/events/sched/sched_switch/id" );
const auto switchIdStr = ReadFile( traceFsPath, "/events/sched/sched_switch/id" );
if( switchIdStr ) switchId = atoi( switchIdStr );
const auto wakingIdStr = ReadFile( "/sys/kernel/debug/tracing/events/sched/sched_waking/id" );
const auto wakingIdStr = ReadFile( traceFsPath, "/events/sched/sched_waking/id" );
if( wakingIdStr ) wakingId = atoi( wakingIdStr );
const auto vsyncIdStr = ReadFile( "/sys/kernel/debug/tracing/events/drm/drm_vblank_event/id" );
const auto vsyncIdStr = ReadFile( traceFsPath, "/events/drm/drm_vblank_event/id" );
if( vsyncIdStr ) vsyncId = atoi( vsyncIdStr );
tracy_free( traceFsPath );
TracyDebug( "sched_switch id: %i\n", switchId );
TracyDebug( "sched_waking id: %i\n", wakingId );
TracyDebug( "drm_vblank_event id: %i\n", vsyncId );