D16573.1786083080.diff
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	Index: sys/kern/vfs_bio.c
	===================================================================
	--- sys/kern/vfs_bio.c
	+++ sys/kern/vfs_bio.c
	@@ -4170,6 +4170,25 @@
	}

	/*
	+ * Return true if new buffer should be malloc'ed.
	+ */
	+
	+static bool
	+want_malloc_buf(struct buf *bp, int newbsize)
	+{
	+ if (bp->b_bufsize != 0)
	+ return false;
	+
	+ if (newbsize > PAGE_SIZE / 2)
	+ return false;
	+
	+ if (bufmallocspace >= maxbufmallocspace)
	+ return false;
	+
	+ return true;
	+}
	+
	+/*
	* Truncate the backing store for a non-vmio buffer.
	*/
	static void
	@@ -4211,8 +4230,7 @@
	* is probably extremely rare and not worth worrying
	* over.
	*/
	- if (bp->b_bufsize == 0 && newbsize <= PAGE_SIZE/2 &&
	- bufmallocspace < maxbufmallocspace) {
	+ if (want_malloc_buf(bp, newbsize)) {
	bp->b_data = malloc(newbsize, M_BIOBUF, M_WAITOK);
	bp->b_flags \|= B_MALLOC;
	bufmallocadjust(bp, newbsize);
	@@ -4272,7 +4290,8 @@

	newbsize = roundup2(size, DEV_BSIZE);
	if ((bp->b_flags & B_VMIO) == 0) {
	- if ((bp->b_flags & B_MALLOC) == 0)
	+ if ((bp->b_flags & B_MALLOC) == 0 &&
	+ !want_malloc_buf(bp, newbsize))
	newbsize = round_page(newbsize);
	/*
	* Just get anonymous memory from the kernel. Don't