Author: glebius
Date: Mon Feb 18 21:27:13 2019
New Revision: 344269
URL: https://svnweb.freebsd.org/changeset/base/344269
Log:
With r343051 UMA switched from atomic counts to counter(9) and now kernel
reports snap counts of how much a zone alloced and how much it freed. It
may happen that snap values doesn't match, e.g alloced - freed < 0.
Workaround that in memstat library.
Reported by: pho
Modified:
head/lib/libmemstat/memstat_uma.c
Modified: head/lib/libmemstat/memstat_uma.c
==============================================================================
--- head/lib/libmemstat/memstat_uma.c Mon Feb 18 20:29:19 2019
(r344268)
+++ head/lib/libmemstat/memstat_uma.c Mon Feb 18 21:27:13 2019
(r344269)
@@ -213,6 +213,15 @@ retry:
mtp->mt_numfrees += upsp->ups_frees;
}
+ /*
+ * Values for uth_allocs and uth_frees frees are snap.
+ * It may happen that kernel reports that number of frees
+ * is greater than number of allocs. See counter(9) for
+ * details.
+ */
+ if (mtp->mt_numallocs < mtp->mt_numfrees)
+ mtp->mt_numallocs = mtp->mt_numfrees;
+
mtp->mt_size = uthp->uth_size;
mtp->mt_rsize = uthp->uth_rsize;
mtp->mt_memalloced = mtp->mt_numallocs * uthp->uth_size;
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