D25950.diff
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	Index: sys/kern/vfs_subr.c
	===================================================================
	--- sys/kern/vfs_subr.c
	+++ sys/kern/vfs_subr.c
	@@ -492,7 +492,16 @@
	static void *
	buf_trie_alloc(struct pctrie *ptree)
	{
	- return (uma_zalloc_smr(buf_trie_zone, M_NOWAIT));
	+ void *res;
	+
	+ /* Spin to accommodate potential SMR free latency. */
	+ for (;;) {
	+ res = uma_zalloc_smr(buf_trie_zone, M_NOWAIT);
	+ if (__predict_true(res != NULL))
	+ break;
	+ smr_synchronize(buf_trie_smr);
	+ }
	+ return (res);
	}

	static void
	@@ -677,7 +686,8 @@
	NULL, NULL, pctrie_zone_init, NULL, UMA_ALIGN_PTR,
	UMA_ZONE_NOFREE \| UMA_ZONE_SMR);
	buf_trie_smr = uma_zone_get_smr(buf_trie_zone);
	- uma_prealloc(buf_trie_zone, nbuf);
	+ /* XXX: slop */
	+ uma_prealloc(buf_trie_zone, nbuf * 3 / 2);

	vnodes_created = counter_u64_alloc(M_WAITOK);
	recycles_count = counter_u64_alloc(M_WAITOK);