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Re: [Qemu-devel] [PATCH v11 3/6] virtio-balloon: VIRTIO_BALLOON_F_PAGE_C

From: Dave Hansen
Subject: Re: [Qemu-devel] [PATCH v11 3/6] virtio-balloon: VIRTIO_BALLOON_F_PAGE_CHUNKS
Date: Tue, 13 Jun 2017 10:59:07 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 
On 06/13/2017 10:56 AM, Michael S. Tsirkin wrote:
>> +/* The size of one page_bmap used to record inflated/deflated pages. */
>> +#define VIRTIO_BALLOON_PAGE_BMAP_SIZE       (8 * PAGE_SIZE)
> At this size, you probably want alloc_pages to avoid kmalloc
> overhead.

For slub, at least, kmalloc() just calls alloc_pages() basically
directly.  There's virtually no overhead.
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