diff options
Diffstat (limited to 'lib/thread.c')
| -rw-r--r-- | lib/thread.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/thread.c b/lib/thread.c index 6d91ca497b..90074b3d89 100644 --- a/lib/thread.c +++ b/lib/thread.c @@ -1884,6 +1884,27 @@ unsigned long thread_consumed_time(RUSAGE_T *now, RUSAGE_T *start, unsigned long *cputime) { #ifdef HAVE_CLOCK_THREAD_CPUTIME_ID + +#ifdef __FreeBSD__ + /* + * FreeBSD appears to have an issue when calling clock_gettime + * with CLOCK_THREAD_CPUTIME_ID really close to each other + * occassionally the now time will be before the start time. + * This is not good and FRR is ending up with CPU HOG's + * when the subtraction wraps to very large numbers + * + * What we are going to do here is cheat a little bit + * and notice that this is a problem and just correct + * it so that it is impossible to happen + */ + if (start->cpu.tv_sec == now->cpu.tv_sec && + start->cpu.tv_nsec > now->cpu.tv_nsec) + now->cpu.tv_nsec = start->cpu.tv_nsec + 1; + else if (start->cpu.tv_sec > now->cpu.tv_sec) { + now->cpu.tv_sec = start->cpu.tv_sec; + now->cpu.tv_nsec = start->cpu.tv_nsec + 1; + } +#endif *cputime = (now->cpu.tv_sec - start->cpu.tv_sec) * TIMER_SECOND_MICRO + (now->cpu.tv_nsec - start->cpu.tv_nsec) / 1000; #else |