linux-kernel - Re: [PATCH 3/3] mm: call vma_adjust_trans

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Date:	Thu, 27 Feb 2014 13:23:50 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mm: call vma_adjust_trans_huge() only for
 thp-enabled vma

On Wed, 26 Feb 2014 23:39:37 -0500 Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:

> vma_adjust() is called also for vma(VM_HUGETLB) and it could happen that
> we happen to try to split hugetlbfs hugepage. So exclude the possibility.
> 

It would be nice to have a more complete changelog here please.  Under
what circumstances does this cause problems and what are the
user-observable effects?

> --- next-20140220.orig/mm/mmap.c
> +++ next-20140220/mm/mmap.c
> @@ -772,7 +772,8 @@ again:			remove_next = 1 + (end > next->vm_end);
>  		}
>  	}
>  
> -	vma_adjust_trans_huge(vma, start, end, adjust_next);
> +	if (transparent_hugepage_enabled(vma))
> +		vma_adjust_trans_huge(vma, start, end, adjust_next);
>  
>  	anon_vma = vma->anon_vma;
>  	if (!anon_vma && adjust_next)
> -- 
> 1.8.5.3
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