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Date: Tue, 26 Jun 2012 12:07:11 +0400
From: Glauber Costa <glommer@parallels.com>
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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>,
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        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>
Subject: Re: RFC:  Easy-Reclaimable LRU list
References: <4FE012CD.6010605@kernel.org> <4FE82555.2010704@parallels.com> <4FE8FE70.6050107@kernel.org>
In-Reply-To: <4FE8FE70.6050107@kernel.org>
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On 06/26/2012 04:12 AM, Minchan Kim wrote:
> On 06/25/2012 05:46 PM, Glauber Costa wrote:
>
>> 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 ?
>
>
> Sorry for not being able to understand your point.
> Can you elaborate a bit more?
>

Well, maybe I didn't =)
I was just wondering why exactly it is that troubles your scheme with 
compaction, and if such restriction would also apply to memory movement
schemes like CMA.


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