linux-kernel - Re: [PATCH 12/13] mm: numa: Scan pages with elevated page

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Message-ID: <20130703184213.GE18898@dyad.programming.kicks-ass.net>
Date:	Wed, 3 Jul 2013 20:42:13 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 12/13] mm: numa: Scan pages with elevated page_mapcount

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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