On 07/26/2016 06:23 PM, Liang Li wrote:

+	vb->pfn_limit = VIRTIO_BALLOON_PFNS_LIMIT;
+	vb->pfn_limit = min(vb->pfn_limit, get_max_pfn());
+	vb->bmap_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) /
+		 BITS_PER_BYTE + 2 * sizeof(unsigned long);
+	hdr_len = sizeof(struct balloon_bmap_hdr);
+	vb->bmap_hdr = kzalloc(hdr_len + vb->bmap_len, GFP_KERNEL);

This ends up doing a 1MB kmalloc() right?  That seems a _bit_ big.  How
big was the pfn buffer before?

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