linux-kernel - Re: [PATCH 2/8] thp, mm: avoid PageUnevictable on active/inactive lru lists

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Message-ID: <51B74A7A.1040707@sr71.net>
Date:	Tue, 11 Jun 2013 09:04:10 -0700
From:	Dave Hansen <dave@...1.net>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] thp, mm: avoid PageUnevictable on active/inactive
 lru lists

On 06/11/2013 08:35 AM, Kirill A. Shutemov wrote:
> active/inactive lru lists can contain unevicable pages (i.e. ramfs pages
> that have been placed on the LRU lists when first allocated), but these
> pages must not have PageUnevictable set - otherwise shrink_[in]active_list
> goes crazy:

I think it's also important here to note if this is a bug that can be
hit _currently_, or if this really is just a preparatory patch for
transparent huge page cache.

>From what I can see, this is _needed_ preparatory work, but it can also
stand on its own because it simplifies things.  It should go in sooner
rather than later.
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