linux-kernel - Re: [PATCH v3 0/5] hugetlb: add support gigantic page allocation at runtime

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Message-Id: <20140417160110.3f36b972b25525fbbe23681b@linux-foundation.org>
Date:	Thu, 17 Apr 2014 16:01:10 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Luiz Capitulino <lcapitulino@...hat.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	mtosatti@...hat.com, aarcange@...hat.com, mgorman@...e.de,
	andi@...stfloor.org, davidlohr@...com, rientjes@...gle.com,
	isimatu.yasuaki@...fujitsu.com, yinghai@...nel.org,
	riel@...hat.com, n-horiguchi@...jp.nec.com, kirill@...temov.name
Subject: Re: [PATCH v3 0/5] hugetlb: add support gigantic page allocation at
 runtime

On Thu, 10 Apr 2014 13:58:40 -0400 Luiz Capitulino <lcapitulino@...hat.com> wrote:

> The HugeTLB subsystem uses the buddy allocator to allocate hugepages during
> runtime. This means that hugepages allocation during runtime is limited to
> MAX_ORDER order. For archs supporting gigantic pages (that is, page sizes
> greater than MAX_ORDER), this in turn means that those pages can't be
> allocated at runtime.

Dumb question: what's wrong with just increasing MAX_ORDER?
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