From aa432983093fc696dcf72c7d3557bbbefee231f9 Mon Sep 17 00:00:00 2001 From: Gleb Smirnoff Date: Mon, 18 Feb 2019 21:27:13 +0000 Subject: [PATCH] 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 --- lib/libmemstat/memstat_uma.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/lib/libmemstat/memstat_uma.c b/lib/libmemstat/memstat_uma.c index 87a6b573307b..89b394c151ad 100644 --- a/lib/libmemstat/memstat_uma.c +++ b/lib/libmemstat/memstat_uma.c @@ -213,6 +213,15 @@ memstat_sysctl_uma(struct memory_type_list *list, int flags) 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;