RFC: [PATCH] disabling buckets under "low memory"

hello,

would anyone object to the following patch?

===

Index: uma_core.c
===================================================================
--- uma_core.c	(revision 616)
+++ uma_core.c	(working copy)
_at__at_ -267,10 +267,7 _at__at_
 static void
 bucket_enable(void)
 {
-	if (cnt.v_free_count < cnt.v_free_min)
-		bucketdisable = 1;
-	else
-		bucketdisable = 0;
+	bucketdisable = vm_page_count_min();
 }

===

i've observed situation where per-cpu buckets were disabled while
there were enough free cached pages. basically, cnt.v_free_count was
sitting stable at a value lower than cnt.v_free_min and that caused
massive performance drop. tuning down vm.v_free_min sysctl immediately
helped.

thanks,
max