diff options
Diffstat (limited to 'libdm/libdm-stats.c')
| -rw-r--r-- | libdm/libdm-stats.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libdm/libdm-stats.c b/libdm/libdm-stats.c index 057bbcc7b..c0ef38f4c 100644 --- a/libdm/libdm-stats.c +++ b/libdm/libdm-stats.c @@ -2656,10 +2656,19 @@ static int _utilization(const struct dm_stats *dms, double *util, * for the last interval; do not allow a value > 100% utilization * to be passed to a dm_make_percent() call. We expect to see these * at startup if counters have not been cleared before the first read. + * + * A zero interval_ns is also an error since metrics cannot be + * calculated without a defined interval - return zero and emit a + * backtrace in this case. */ io_nsecs = dm_stats_get_counter(dms, DM_STATS_IO_NSECS, region_id, area_id); + if (!interval_ns) { + *util = 0.0; + return_0; + } + io_nsecs = ((io_nsecs < interval_ns) ? io_nsecs : interval_ns); *util = (double) io_nsecs / (double) interval_ns; |