linux-kernel - Re: [PATCH v2] mm, hugetlb: set PageLRU for in-use/active hugepages

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Message-ID: <20150218010714.GD4823@hori1.linux.bs1.fc.nec.co.jp>
Date:	Wed, 18 Feb 2015 01:07:29 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Hugh Dickins <hughd@...gle.com>, Michal Hocko <mhocko@...e.cz>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v2] mm, hugetlb: set PageLRU for in-use/active hugepages

On Tue, Feb 17, 2015 at 04:02:49PM -0800, Andrew Morton wrote:
> On Tue, 17 Feb 2015 15:57:44 -0800 Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > So if I'm understanding this correctly, hugepages never have PG_lru set
> > and so you are overloading that bit on hugepages to indicate that the
> > page is present on hstate->hugepage_activelist?
> 
> And maybe we don't need to overload PG_lru at all?  There's plenty of
> free space in the compound page's *(page + 1).

Right, that's not necessary. So I'll use PG_private in *(page + 1), that's
unused now and no worry about conflicting with other usage.

Thanks,
Naoya Horiguchi--
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