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

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Message-Id: <20150217160249.7d498e4bd0837748e8c6a5f0@linux-foundation.org>
Date:	Tue, 17 Feb 2015 16:02:49 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	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, 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).

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