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

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Message-ID: <CALYGNiOrNfxbCJggraxgiFOdvn3jki_751cpssi+p_eST0Wdgg@mail.gmail.com>
Date:	Tue, 28 Oct 2014 23:56:15 +0400
From:	Konstantin Khlebnikov <koct9i@...il.com>
To:	Konstantin Khlebnikov <koct9i@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Konstantin Khlebnikov <k.khlebnikov@...sung.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Rafael Aquini <aquini@...hat.com>,
	Stable <stable@...r.kernel.org>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: [PATCH v3 1/4] mm/balloon_compaction: redesign ballooned pages management

On Tue, Oct 28, 2014 at 9:47 PM, Matt Mullins <mmullins@...x.us> 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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