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Date: Mon, 25 Jun 2012 12:46:13 +0400
From: Glauber Costa <glommer@parallels.com>
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Subject: Re: RFC:  Easy-Reclaimable LRU list
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To: Minchan Kim <minchan@kernel.org>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, KOSAKI Motohiro <kosaki.motohiro@gmail.com>, Johannes Weiner <hannes@cmpxchg.org>, Andrea Arcangeli <aarcange@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Anton Vorontsov <anton.vorontsov@linaro.org>, John Stultz <john.stultz@linaro.org>, Pekka Enberg <penberg@kernel.org>, Wu Fengguang <fengguang.wu@intel.com>, Hugh Dickins <hughd@google.com>

On 06/19/2012 09:49 AM, Minchan Kim wrote:
> Hi everybody!
>
> Recently, there are some efforts to handle system memory pressure.
>
> 1) low memory notification - [1]
> 2) fallocate(VOLATILE) - [2]
> 3) fadvise(NOREUSE) - [3]
>
> For them, I would like to add new LRU list, aka "Ereclaimable" which is opposite of "unevictable".
> Reclaimable LRU list includes_easy_  reclaimable pages.
> For example, easy reclaimable pages are following as.
>
> 1. invalidated but remained LRU list.
> 2. pageout pages for reclaim(PG_reclaim pages)
> 3. fadvise(NOREUSE)
> 4. fallocate(VOLATILE)
>
> Their pages shouldn't stir normal LRU list and compaction might not migrate them, even.
What about other things moving memory like CMA ?



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