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

Dave Hansen
2016-07-27T16:03:21Z

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?