Re: [PATCH v3 1/4] mm/balloon_compaction: redesign ballooned pages management

[Konstantin Khlebnikov]

On Tue, Oct 28, 2014 at 9:47 PM, Matt Mullins <mmullins@xxxxxxx> wrote:
> On Sat, Sep 27, 2014 at 11:15:16PM +0400, Konstantin Khlebnikov wrote:
>> This patch fixes all of them.
>
> It seems to have rendered virtio_balloon completely ineffective without
> CONFIG_COMPACTION and CONFIG_BALLOON_COMPACTION, even for the case that I'm
> expanding the memory available to my VM.

What do you mean by ineffective?

That it cannot handle fragmentation? I saw that without compaction
ballooning works even better:
it allocates pages without GFP_MOVABLE and buddy allocator returns
much less scattered pages.

>
> Was this intended?  Should Kconfig be updated so that VIRTIO_BALLOON depends on
> BALLOON_COMPACTION now?

Nope, this is independent feature.
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