linux-kernel - Re: [PATCH V5] Allow compaction of unevictable pages

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Date:	Fri, 13 Mar 2015 14:56:14 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Eric B Munson <emunson@...mai.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Vlastimil Babka <vbabka@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Lameter <cl@...ux.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5] Allow compaction of unevictable pages

On 03/13/2015 01:26 PM, Eric B Munson wrote:

> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -1046,6 +1046,8 @@ typedef enum {
>  	ISOLATE_SUCCESS,	/* Pages isolated, migrate */
>  } isolate_migrate_t;
>  
> +int sysctl_compact_unevictable;
> +
>  /*
>   * Isolate all pages that can be migrated from the first suitable block,
>   * starting at the block pointed to by the migrate scanner pfn within

I suspect that the use cases where users absolutely do not want
unevictable pages migrated are special cases, and it may make
sense to enable sysctl_compact_unevictable by default.
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