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Inject tracy_systrace into filesystem and use instead of cat.

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Statistics for a one-minute trace:

  Capture tool | Running time | Running regions
---------------+--------------+-----------------
      cat      |    25.11 s   |     392,300
tracy_systrace |    10.41 s   |      12,249
This commit is contained in:
Bartosz Taudul 2019-09-27 15:51:29 +02:00
parent 3dba4088ee
commit 130365f4ff
1 changed files with 50 additions and 0 deletions
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50
client/TracySysTrace.cpp
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@ -322,6 +322,7 @@ void SysTraceSendExternalName( uint64_t thread )
# include <sys/types.h>
# include <sys/stat.h>
# include <sys/wait.h>
# include <fcntl.h>
# include <inttypes.h>
# include <limits>
@ -333,6 +334,10 @@ void SysTraceSendExternalName( uint64_t thread )
# include "TracyProfiler.hpp"
# ifdef __ANDROID__
# include "TracySysTracePayload.hpp"
# endif
namespace tracy
{
@ -381,6 +386,43 @@ static bool TraceWrite( const char* path, size_t psz, const char* val, size_t vs
}
#endif
#ifdef __ANDROID__
void SysTraceInjectPayload()
{
int pipefd[2];
if( pipe( pipefd ) == 0 )
{
const auto pid = fork();
if( pid == 0 )
{
// child
close( pipefd[1] );
if( dup2( pipefd[0], STDIN_FILENO ) >= 0 )
{
close( pipefd[0] );
execlp( "su", "su", "-c", "cat > /data/tracy_systrace", (char*)nullptr );
exit( 1 );
}
}
else if( pid > 0 )
{
// parent
close( pipefd[0] );
#ifdef __aarch64__
write( pipefd[1], tracy_systrace_aarch64_data, tracy_systrace_aarch64_size );
#else
write( pipefd[1], tracy_systrace_armv7_data, tracy_systrace_armv7_size );
#endif
close( pipefd[1] );
waitpid( pid, nullptr, 0 );
system( "su -c 'chmod 700 /data/tracy_systrace'" );
}
}
}
#endif
bool SysTraceStart()
{
if( !TraceWrite( TracingOn, sizeof( TracingOn ), "0", 2 ) ) return false;
@ -395,6 +437,11 @@ bool SysTraceStart()
#endif
if( !TraceWrite( SchedSwitch, sizeof( SchedSwitch ), "1", 2 ) ) return false;
if( !TraceWrite( SchedWakeup, sizeof( SchedWakeup ), "1", 2 ) ) return false;
#if defined __ANDROID__ && ( defined __aarch64__ || defined __ARM_ARCH )
SysTraceInjectPayload();
#endif
if( !TraceWrite( TracingOn, sizeof( TracingOn ), "1", 2 ) ) return false;
return true;
@ -666,6 +713,9 @@ void SysTraceWorker( void* ptr )
if( dup2( pipefd[1], STDOUT_FILENO ) >= 0 )
{
close( pipefd[1] );
#if defined __ANDROID__ && ( defined __aarch64__ || defined __ARM_ARCH )
execlp( "su", "su", "-c", "/data/tracy_systrace", (char*)nullptr );
#endif
execlp( "su", "su", "-c", "cat /sys/kernel/debug/tracing/trace_pipe", (char*)nullptr );
exit( 1 );
}