linux-kernel - Re: [PATCH -mm] remove swap token code

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Date:	Wed, 11 Apr 2012 14:10:17 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kosaki.motohiro@...il.com
Subject: Re: [PATCH -mm] remove swap token code

(4/10/12 9:48 PM), Johannes Weiner wrote:
> On Mon, Apr 09, 2012 at 11:32:01AM -0400, Rik van Riel wrote:
>> The swap token code no longer fits in with the current VM model.
>> It does not play well with cgroups or the better NUMA placement
>> code in development, since we have only one swap token globally.
>>
>> It also has the potential to mess with scalability of the system,
>> by increasing the number of non-reclaimable pages on the active
>> and inactive anon LRU lists.
>>
>> Last but not least, the swap token code has been broken for a
>> year without complaints.  This suggests we no longer have much
>> use for it.
>>
>> The days of sub-1G memory systems with heavy use of swap are
>> over. If we ever need thrashing reducing code in the future,
>> we will have to implement something that does scale.
>>
>> Signed-off-by: Rik van Riel<riel@...hat.com>
>
> Acked-by: Johannes Weiner<hannes@...xchg.org>

Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

I really think swap token is sane. but now (after merging Johannes's memcg naturalization)
it don't work and we don't have a reason to maintain _current_ implementaion.



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