Fix macOS CPU time calculations

1 files changed, 6 insertions, 4 deletions

diff --git a/darwin/DarwinProcessList.c b/darwin/DarwinProcessList.c
index 60f8a7ca..3cfdca6f 100644
--- a/darwin/DarwinProcessList.c
+++ b/darwin/DarwinProcessList.c
@@ -160,9 +160,11 @@ void ProcessList_delete(ProcessList* this) {
    free(this);
 }
 
-static double ticksToNanoseconds(const double ticks) {
+// Converts "scheduler ticks" to nanoseconds.
+// See `sysconf(_SC_CLK_TCK)`, as used to define the `Platform_clockTicksPerSec` constant.
+static double schedulerTicksToNanoseconds(const double ticks) {
    const double nanos_per_sec = 1e9;
-   return (ticks / Platform_timebaseToNS) * (nanos_per_sec / (double) Platform_clockTicksPerSec);
+   return ticks * (nanos_per_sec / (double) Platform_clockTicksPerSec);
 }
 
 void ProcessList_goThroughEntries(ProcessList* super, bool pauseProcessUpdate) {
@@ -192,7 +194,7 @@ void ProcessList_goThroughEntries(ProcessList* super, bool pauseProcessUpdate) {
       }
    }
 
-   const double time_interval = ticksToNanoseconds(dpl->global_diff) / (double) dpl->super.activeCPUs;
+   const double time_interval_ns = schedulerTicksToNanoseconds(dpl->global_diff) / (double) dpl->super.activeCPUs;
 
    /* Clear the thread counts */
    super->kernelThreads = 0;
@@ -213,7 +215,7 @@ void ProcessList_goThroughEntries(ProcessList* super, bool pauseProcessUpdate) {
       proc = (DarwinProcess*)ProcessList_getProcess(super, ps[i].kp_proc.p_pid, &preExisting, DarwinProcess_new);
 
       DarwinProcess_setFromKInfoProc(&proc->super, &ps[i], preExisting);
-      DarwinProcess_setFromLibprocPidinfo(proc, dpl, time_interval);
+      DarwinProcess_setFromLibprocPidinfo(proc, dpl, time_interval_ns);
 
       if (proc->super.st_uid != ps[i].kp_eproc.e_ucred.cr_uid) {
          proc->super.st_uid = ps[i].kp_eproc.e_ucred.cr_uid;