Re: [PATCH V5] Allow compaction of unevictable pages

[Rik van Riel]

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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