linux-kernel - Re: [PATCH 8/8] prepare to remove /proc/sys/vm/hugepages_treat_as

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Message-ID: <87k3k7q4ox.fsf@linux.vnet.ibm.com>
Date:	Wed, 31 Jul 2013 00:02:30 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc:	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Hillf Danton <dhillf@...il.com>, Michal Hocko <mhocko@...e.cz>,
	Rik van Riel <riel@...hat.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH 8/8] prepare to remove /proc/sys/vm/hugepages_treat_as_movable

Naoya Horiguchi <n-horiguchi@...jp.nec.com> writes:

> Now hugepages are definitely movable. So allocating hugepages from
> ZONE_MOVABLE is natural and we have no reason to keep this parameter.
> In order to allow userspace to prepare for the removal, let's leave
> this sysctl handler as noop for a while.

I guess you still need to handle architectures for which pmd_huge is

int pmd_huge(pmd_t pmd)
{
	return 0;
}

embedded powerpc is one. They don't store pte information at the PMD
level. Instead pmd contains a pointer to hugepage directory which
contain huge pte.

-aneesh

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