xnu-7195.50.7.100.1.tar.gz

[apple/xnu.git] / tests / vm / perf_helpers.c

diff --git a/tests/vm/perf_helpers.c b/tests/vm/perf_helpers.c
new file mode 100644 (file)
index 0000000..b4dea31
--- /dev/null
+++ b/tests/vm/perf_helpers.c
@@ -0,0 +1,69 @@
+#include <assert.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/mman.h>
+
+#include "vm/perf_helpers.h"
+
+#define K_CTIME_BUFFER_LEN  26
+void
+benchmark_log(bool verbose, const char *restrict fmt, ...)
+{
+       time_t now;
+       char time_buffer[K_CTIME_BUFFER_LEN];
+       struct tm local_time;
+       va_list args;
+       if (verbose) {
+               strncpy(time_buffer, "UNKNOWN", K_CTIME_BUFFER_LEN);
+
+               now = time(NULL);
+               if (now != -1) {
+                       struct tm* ret = localtime_r(&now, &local_time);
+                       if (ret == &local_time) {
+                               snprintf(time_buffer, K_CTIME_BUFFER_LEN,
+                                   "%.2d/%.2d/%.2d %.2d:%.2d:%.2d",
+                                   local_time.tm_mon + 1, local_time.tm_mday,
+                                   local_time.tm_year + 1900,
+                                   local_time.tm_hour, local_time.tm_min,
+                                   local_time.tm_sec);
+                       }
+               }
+
+               printf("%s: ", time_buffer);
+               va_start(args, fmt);
+               vprintf(fmt, args);
+               fflush(stdout);
+       }
+}
+
+uint64_t
+timespec_difference_us(const struct timespec* a, const struct timespec* b)
+{
+       assert(a->tv_sec >= b->tv_sec || a->tv_nsec >= b->tv_nsec);
+       long seconds_elapsed = a->tv_sec - b->tv_sec;
+       uint64_t nsec_elapsed;
+       if (b->tv_nsec > a->tv_nsec) {
+               seconds_elapsed--;
+               nsec_elapsed = kNumNanosecondsInSecond - (uint64_t) (b->tv_nsec - a->tv_nsec);
+       } else {
+               nsec_elapsed = (uint64_t) (a->tv_nsec - b->tv_nsec);
+       }
+       return (uint64_t) seconds_elapsed * kNumMicrosecondsInSecond + nsec_elapsed / kNumNanosecondsInMicrosecond;
+}
+
+unsigned char *
+mmap_buffer(size_t memsize)
+{
+       int fd = -1;
+       unsigned char* addr = (unsigned char *)mmap(NULL, memsize, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
+           fd, 0);
+       if ((void*) addr == MAP_FAILED) {
+               fprintf(stderr, "Unable to mmap a memory object: %s\n", strerror(errno));
+               exit(2);
+       }
+       return addr;
+}