Re: [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate process

[Dave Hansen]

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?