linux-kernel - Re: [PATCH 02/10] hugetlb: add allocate function for hugepage migration

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Message-ID: <alpine.DEB.2.00.1009221558000.32661@router.home>
Date:	Wed, 22 Sep 2010 16:05:47 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
cc:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Jun'ichi Nomura <j-nomura@...jp.nec.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, tony.luck@...el.com
Subject: Re: [PATCH 02/10] hugetlb: add allocate function for hugepage
 migration

On Wed, 8 Sep 2010, Naoya Horiguchi wrote:

> We can't use existing hugepage allocation functions to allocate hugepage
> for page migration, because page migration can happen asynchronously with
> the running processes and page migration users should call the allocation
> function with physical addresses (not virtual addresses) as arguments.

Ummm... Some arches like IA64 need huge pages fixed at certain virtual
addresses in which only huge pages exist. A vma is needed in order to be
able to assign proper virtual address to the page.

How does that work with transparent huge pages anyways?

This looks like its going to break IA64 hugepage support for good. Maybe
thats okay given the reduced significance of IA64? Certainly would
simplify the code.

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