Re: [PATCH 12/13] mm: numa: Scan pages with elevated page_mapcount

[Peter Zijlstra]

On Wed, Jul 03, 2013 at 03:21:39PM +0100, Mel Gorman wrote:
> @@ -1587,10 +1588,11 @@ int migrate_misplaced_page(struct page *page, int node)
>  	LIST_HEAD(migratepages);
>  
>  	/*
> +	 * Don't migrate file pages that are mapped in multiple processes
> +	 * with execute permissions as they are probably shared libraries.
>  	 */
> +	if (page_mapcount(page) != 1 && page_is_file_cache(page) &&
> +	    (vma->vm_flags & VM_EXEC))
>  		goto out;

So we will migrate DSOs that are mapped but once. That's fair enough I suppose.
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