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

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Message-ID: <20120411014855.GA1929@cmpxchg.org>
Date:	Wed, 11 Apr 2012 03:48:55 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] remove swap token code

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>
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