diff options
Diffstat (limited to 'erts/emulator/sys/unix/erl_unix_sys.h')
-rw-r--r-- | erts/emulator/sys/unix/erl_unix_sys.h | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h index 0352ee1b3c..9f137048de 100644 --- a/erts/emulator/sys/unix/erl_unix_sys.h +++ b/erts/emulator/sys/unix/erl_unix_sys.h @@ -101,6 +101,10 @@ #endif #include <netdb.h> +#ifdef HAVE_MACH_ABSOLUTE_TIME +#include <mach/mach_time.h> +#endif + #ifdef HAVE_POSIX_MEMALIGN # define ERTS_HAVE_ERTS_SYS_ALIGNED_ALLOC 1 #endif @@ -266,7 +270,31 @@ erts_os_times(ErtsMonotonicTime *mtimep, ErtsSystemTime *stimep) #endif /* ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT */ /* - * + * Functions for getting the performance counter + */ + +#if defined(__x86_64__) + /* available on all x86_64. Best if used when we have constant_tsc and + nonstop_tsc cpu features. It may have been a good idea to put the + cpuid instruction before the rdtsc, but I decided against it + because it is not really needed for msacc, and it slows it down by + quite a bit. As a result though, this timestamp becomes much less + accurate as it might be re-ordered to be executed way before this + function is called. + */ +#define sys_perf_counter(ts) do { \ + __asm__ __volatile__ ("rdtsc\n\t" \ + "shl $32, %%rdx\n\t" \ + "or %%rdx, %0" : "=a" (*ts) : : "rdx"); \ + } while(0) +#define SYS_PERF_COUNTER_UNIT erts_perf_counter_unit() +#else +#define sys_perf_counter(ts) *(ts) = erts_get_perf_counter() +#define SYS_PERF_COUNTER_UNIT 1000000000LL +#endif + +/* + * Functions for measuring CPU time */ #if (defined(HAVE_GETHRVTIME) || defined(HAVE_CLOCK_GETTIME_CPU_TIME)) |