From 649994706bdd41949a9a4680ef81decedd3678b4 Mon Sep 17 00:00:00 2001
From: Bartosz Taudul <wolf.pld@gmail.com>
Date: Wed, 12 Aug 2020 16:48:36 +0200
Subject: [PATCH] Use clock monotonic raw on Linux.

Because Linux kernel interfaces are fucking stupid.
---
 client/TracyProfiler.cpp |  9 ---------
 client/TracyProfiler.hpp | 21 +++++++++++----------
 client/TracySysTrace.cpp |  8 --------
 3 files changed, 11 insertions(+), 27 deletions(-)

diff --git a/client/TracyProfiler.cpp b/client/TracyProfiler.cpp
index 042f0d94..8525cc7a 100644
--- a/client/TracyProfiler.cpp
+++ b/client/TracyProfiler.cpp
@@ -84,11 +84,6 @@
 #  endif
 #endif
 
-#if defined TRACY_HW_TIMER && __ARM_ARCH >= 6 && !defined TARGET_OS_IOS
-#  include <signal.h>
-#  include <setjmp.h>
-#endif
-
 #if defined _WIN32 || defined __CYGWIN__
 #  include <lmcons.h>
 extern "C" typedef LONG (WINAPI *t_RtlGetVersion)( PRTL_OSVERSIONINFOW );
@@ -2585,9 +2580,6 @@ void Profiler::HandleDisconnect()
 void Profiler::CalibrateTimer()
 {
 #ifdef TRACY_HW_TIMER
-#  if !defined TARGET_OS_IOS && __ARM_ARCH >= 6
-    m_timerMul = 1.;
-#  else
     std::atomic_signal_fence( std::memory_order_acq_rel );
     const auto t0 = std::chrono::high_resolution_clock::now();
     const auto r0 = GetTime();
@@ -2602,7 +2594,6 @@ void Profiler::CalibrateTimer()
     const auto dr = r1 - r0;
 
     m_timerMul = double( dt ) / double( dr );
-#  endif
 #else
     m_timerMul = 1.;
 #endif
diff --git a/client/TracyProfiler.hpp b/client/TracyProfiler.hpp
index 465946b2..cf1a1c8c 100644
--- a/client/TracyProfiler.hpp
+++ b/client/TracyProfiler.hpp
@@ -5,6 +5,7 @@
 #include <atomic>
 #include <stdint.h>
 #include <string.h>
+#include <time.h>
 
 #include "tracy_concurrentqueue.h"
 #include "TracyCallstack.hpp"
@@ -24,11 +25,11 @@
 #  include <mach/mach_time.h>
 #endif
 
-#if defined _WIN32 || defined __CYGWIN__ || ( ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 ) && !defined __ANDROID__ ) || __ARM_ARCH >= 6
+#if defined _WIN32 || defined __CYGWIN__ || ( ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 ) && !defined __linux__ ) || ( defined TARGET_OS_IOS && TARGET_OS_IOS == 1 )
 #  define TRACY_HW_TIMER
 #endif
 
-#if !defined TRACY_HW_TIMER || ( defined __ARM_ARCH && __ARM_ARCH >= 6 && !defined CLOCK_MONOTONIC_RAW )
+#if !defined TRACY_HW_TIMER
   #include <chrono>
 #endif
 
@@ -130,14 +131,6 @@ public:
 #ifdef TRACY_HW_TIMER
 #  if defined TARGET_OS_IOS && TARGET_OS_IOS == 1
         return mach_absolute_time();
-#  elif defined __ARM_ARCH && __ARM_ARCH >= 6
-#    ifdef CLOCK_MONOTONIC_RAW
-        struct timespec ts;
-        clock_gettime( CLOCK_MONOTONIC_RAW, &ts );
-        return int64_t( ts.tv_sec ) * 1000000000ll + int64_t( ts.tv_nsec );
-#    else
-        return std::chrono::duration_cast<std::chrono::nanoseconds>( std::chrono::high_resolution_clock::now().time_since_epoch() ).count();
-#    endif
 #  elif defined _WIN32 || defined __CYGWIN__
 #    ifdef TRACY_TIMER_QPC
         return GetTimeQpc();
@@ -152,9 +145,17 @@ public:
         uint64_t rax, rdx;
         asm volatile ( "rdtsc" : "=a" (rax), "=d" (rdx) );
         return ( rdx << 32 ) + rax;
+#  else
+#    error "TRACY_HW_TIMER detection logic needs fixing"
 #  endif
 #else
+#  if defined __linux__ && defined CLOCK_MONOTONIC_RAW
+        struct timespec ts;
+        clock_gettime( CLOCK_MONOTONIC_RAW, &ts );
+        return int64_t( ts.tv_sec ) * 1000000000ll + int64_t( ts.tv_nsec );
+#  else
         return std::chrono::duration_cast<std::chrono::nanoseconds>( std::chrono::high_resolution_clock::now().time_since_epoch() ).count();
+#  endif
 #endif
     }
 
diff --git a/client/TracySysTrace.cpp b/client/TracySysTrace.cpp
index bec85bc4..21df70f6 100644
--- a/client/TracySysTrace.cpp
+++ b/client/TracySysTrace.cpp
@@ -827,11 +827,7 @@ bool SysTraceStart( int64_t& samplingPeriod )
     TraceWrite( TraceOptions, sizeof( TraceOptions ), "norecord-tgid", 14 );
     TraceWrite( TraceOptions, sizeof( TraceOptions ), "noirq-info", 11 );
     TraceWrite( TraceOptions, sizeof( TraceOptions ), "noannotate", 11 );
-#if defined TRACY_HW_TIMER && ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
-    if( !TraceWrite( TraceClock, sizeof( TraceClock ), "x86-tsc", 8 ) ) return false;
-#elif __ARM_ARCH >= 6
     if( !TraceWrite( TraceClock, sizeof( TraceClock ), "mono_raw", 9 ) ) return false;
-#endif
     if( !TraceWrite( SchedSwitch, sizeof( SchedSwitch ), "1", 2 ) ) return false;
     if( !TraceWrite( SchedWakeup, sizeof( SchedWakeup ), "1", 2 ) ) return false;
     if( !TraceWrite( BufferSizeKb, sizeof( BufferSizeKb ), "4096", 5 ) ) return false;
@@ -975,14 +971,10 @@ static void HandleTraceLine( const char* line )
     line++;      // ']'
     while( *line == ' ' ) line++;
 
-#if defined TRACY_HW_TIMER && ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
-    const auto time = ReadNumber( line );
-#elif __ARM_ARCH >= 6
     const auto ts = ReadNumber( line );
     line++;      // '.'
     const auto tus = ReadNumber( line );
     const auto time = ts * 1000000000ll + tus * 1000ll;
-#endif
 
     line += 2;   // ': '
     if( memcmp( line, "sched_switch", 12 ) == 0 )