D45215.1782617266.diff
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D45215.1782617266.diff
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	diff --git a/sys/geom/geom_io.c b/sys/geom/geom_io.c
	--- a/sys/geom/geom_io.c
	+++ b/sys/geom/geom_io.c
	@@ -137,12 +137,16 @@
	return (bp);
	}

	+static int reserved_new_bios = 65536;
	+
	struct bio *
	g_new_bio(void)
	{
	struct bio *bp;

	- bp = uma_zalloc(biozone, M_NOWAIT \| M_ZERO);
	+ bp = uma_zalloc(biozone, M_NOWAIT \| M_ZERO \| M_USE_RESERVE);
	+ if (__predict_false(NULL == bp))
	+ printf("g_new_bio(): failed to allocate\n");
	#ifdef KTR
	if (KTR_GEOM_ENABLED) {
	struct stack st;
	@@ -193,7 +197,7 @@
	{
	struct bio *bp2;

	- bp2 = uma_zalloc(biozone, M_NOWAIT \| M_ZERO);
	+ bp2 = uma_zalloc(biozone, M_NOWAIT \| M_ZERO \| M_USE_RESERVE);
	if (bp2 != NULL) {
	bp2->bio_parent = bp;
	bp2->bio_cmd = bp->bio_cmd;
	@@ -279,6 +283,14 @@
	NULL, NULL,
	NULL, NULL,
	0, 0);
	+ /*
	+ * XXX the reservation of a uma(9) zone cannot be altered if it is serving
	+ * any items.
	+ */
	+ if (reserved_new_bios > 0) {
	+ uma_prealloc(biozone, reserved_new_bios);
	+ uma_zone_reserve(biozone, reserved_new_bios);
	+ }
	}

	int
	@@ -734,6 +746,9 @@
	SYSCTL_INT(_kern_geom, OID_AUTO, inflight_transient_maps, CTLFLAG_RD,
	&inflight_transient_maps, 0,
	"Current count of the active transient maps");
	+SYSCTL_INT(_kern_geom, OID_AUTO, reserved_new_bios, CTLFLAG_RDTUN,
	+ &reserved_new_bios, 0,
	+ "Number of reserved new bios for non-blocking allocation");

	static int
	g_io_transient_map_bio(struct bio *bp)