Re: [PATCH 12/13] mm: numa: Scan pages with elevated page_mapcount
From: Peter Zijlstra
Date: Wed Jul 03 2013 - 14:43:22 EST
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);
>
>
/*
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+ * 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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