linux-kernel - Re: [PATCH v11 3/6] virtio-balloon: VIRTIO_BALLOON_F_PAGE

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Date:   Tue, 13 Jun 2017 21:55:05 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Wei Wang <wei.w.wang@...el.com>, virtio-dev@...ts.oasis-open.org,
        linux-kernel@...r.kernel.org, qemu-devel@...gnu.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, david@...hat.com, cornelia.huck@...ibm.com,
        akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        aarcange@...hat.com, amit.shah@...hat.com, pbonzini@...hat.com,
        liliang.opensource@...il.com, Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v11 3/6] virtio-balloon: VIRTIO_BALLOON_F_PAGE_CHUNKS

On Tue, Jun 13, 2017 at 10:59:07AM -0700, Dave Hansen wrote:
> 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.
> 
> 

OK then.

-- 
MST