D13671.id37364.diff
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	Index: head/sys/vm/vm_swapout.c
	===================================================================
	--- head/sys/vm/vm_swapout.c
	+++ head/sys/vm/vm_swapout.c
	@@ -203,6 +203,8 @@
	TAILQ_FOREACH(p, &object->memq, listq) {
	if (pmap_resident_count(pmap) <= desired)
	goto unlock_return;
	+ if (should_yield())
	+ goto unlock_return;
	if (vm_page_busied(p))
	continue;
	VM_CNT_INC(v_pdpages);
	@@ -516,8 +518,10 @@
	PRELE(p);
	}
	sx_sunlock(&allproc_lock);
	- if (tryagain != 0 && attempts <= 10)
	+ if (tryagain != 0 && attempts <= 10) {
	+ maybe_yield();
	goto again;
	+ }
	}
	}