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diff --git a/sys/kern/uipc_ktls.c b/sys/kern/uipc_ktls.c
--- a/sys/kern/uipc_ktls.c
+++ b/sys/kern/uipc_ktls.c
@@ -495,7 +495,7 @@
ktls_buffer_zone = uma_zcache_create("ktls_buffers",
roundup2(ktls_maxlen, PAGE_SIZE), NULL, NULL, NULL, NULL,
ktls_buffer_import, ktls_buffer_release, NULL,
- UMA_ZONE_FIRSTTOUCH);
+ UMA_ZONE_FIRSTTOUCH | UMA_ZONE_NOTRIM);
}
/*
diff --git a/sys/vm/uma.h b/sys/vm/uma.h
--- a/sys/vm/uma.h
+++ b/sys/vm/uma.h
@@ -252,6 +252,7 @@
#define UMA_ZONE_SECONDARY 0x0200 /* Zone is a Secondary Zone */
#define UMA_ZONE_NOBUCKET 0x0400 /* Do not use buckets. */
#define UMA_ZONE_MAXBUCKET 0x0800 /* Use largest buckets. */
+#define UMA_ZONE_NOTRIM 0x1000 /* Don't trim this zone */
#define UMA_ZONE_CACHESPREAD 0x2000 /*
* Spread memory start locations across
* all possible cache lines. May
diff --git a/sys/vm/uma_core.c b/sys/vm/uma_core.c
--- a/sys/vm/uma_core.c
+++ b/sys/vm/uma_core.c
@@ -1222,7 +1222,7 @@
trim:
/* Trim caches not used for a long time. */
- if ((zone->uz_flags & UMA_ZONE_UNMANAGED) == 0) {
+ if ((zone->uz_flags & (UMA_ZONE_UNMANAGED | UMA_ZONE_NOTRIM)) == 0) {
for (int i = 0; i < vm_ndomains; i++) {
if (bucket_cache_reclaim_domain(zone, false, false, i) &&
(zone->uz_flags & UMA_ZFLAG_CACHE) == 0)
@@ -5306,8 +5306,13 @@
struct uma_reclaim_args *args;
args = arg;
- if ((zone->uz_flags & UMA_ZONE_UNMANAGED) == 0)
- uma_zone_reclaim_domain(zone, args->req, args->domain);
+ if ((zone->uz_flags & UMA_ZONE_UNMANAGED) != 0)
+ return;
+ if ((args->req == UMA_RECLAIM_TRIM) &&
+ (zone->uz_flags & UMA_ZONE_NOTRIM) !=0)
+ return;
+
+ uma_zone_reclaim_domain(zone, args->req, args->domain);
}
/* See uma.h */

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