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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