D45309.id138950.diff
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D45309.id138950.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
	@@ -75,6 +75,9 @@
	static struct g_bioq g_bio_run_down;
	static struct g_bioq g_bio_run_up;

	+static long nomem_count;
	+static long pause_count;
	+
	/*
	* Pace is a hint that we've had some trouble recently allocating
	* bios, so we should back off trying to send I/O down the stack
	@@ -701,6 +704,7 @@

	if (bootverbose)
	printf("ENOMEM %p on %p(%s)\n", bp, pp, pp->name);
	+ atomic_add_long(&nomem_count, 1);
	bp->bio_children = 0;
	bp->bio_inbed = 0;
	bp->bio_driver1 = NULL;
	@@ -734,6 +738,12 @@
	SYSCTL_INT(_kern_geom, OID_AUTO, inflight_transient_maps, CTLFLAG_RD,
	&inflight_transient_maps, 0,
	"Current count of the active transient maps");
	+SYSCTL_LONG(_kern_geom, OID_AUTO, nomem_count, CTLFLAG_RD,
	+ &nomem_count, 0,
	+ "Total count of requests completed with status of ENOMEM");
	+SYSCTL_LONG(_kern_geom, OID_AUTO, pause_count, CTLFLAG_RD,
	+ &pause_count, 0,
	+ "Total count of requests stalled due to low memory in g_down");

	static int
	g_io_transient_map_bio(struct bio *bp)
	@@ -823,6 +833,7 @@
	*/
	CTR0(KTR_GEOM, "g_down pacing self");
	pause("g_down", min(hz/1000, 1));
	+ pause_count++;
	pace = 0;
	}
	CTR2(KTR_GEOM, "g_down processing bp %p provider %s", bp,