linux-kernel - Re: [PATCH v3 1/3] mm: rename alloc_pages_exact_node to __alloc_pages

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Date:	Fri, 31 Jul 2015 14:25:43 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Vlastimil Babka <vbabka@...e.cz>
cc:	Christoph Lameter <cl@...ux.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Greg Thelen <gthelen@...gle.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-ia64@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	cbe-oss-dev@...ts.ozlabs.org, kvm@...r.kernel.org,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Arnd Bergmann <arnd@...db.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Cliff Whickman <cpw@....com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Robin Holt <robinmholt@...il.com>
Subject: Re: [PATCH v3 1/3] mm: rename alloc_pages_exact_node to
 __alloc_pages_node

On Thu, 30 Jul 2015, Vlastimil Babka wrote:

> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index aa58a32..56355f2 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -2469,7 +2469,7 @@ khugepaged_alloc_page(struct page **hpage, gfp_t gfp, struct mm_struct *mm,
>  	 */
>  	up_read(&mm->mmap_sem);
>  
> -	*hpage = alloc_pages_exact_node(node, gfp, HPAGE_PMD_ORDER);
> +	*hpage = __alloc_pages_node(node, gfp, HPAGE_PMD_ORDER);
>  	if (unlikely(!*hpage)) {
>  		count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
>  		*hpage = ERR_PTR(-ENOMEM);
> @@ -2568,9 +2568,7 @@ static void collapse_huge_page(struct mm_struct *mm,
>  
>  	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
>  
> -	/* Only allocate from the target node */
> -	gfp = alloc_hugepage_gfpmask(khugepaged_defrag(), __GFP_OTHER_NODE) |
> -		__GFP_THISNODE;
> +	gfp = alloc_hugepage_gfpmask(khugepaged_defrag(), 0);
>  
>  	/* release the mmap_sem read lock. */
>  	new_page = khugepaged_alloc_page(hpage, gfp, mm, vma, address, node);

Hmm, where is the __GFP_THISNODE enforcement in khugepaged_alloc_page() 
that is removed in collapse_huge_page()?  I also don't see what happened 
to the __GFP_OTHER_NODE.
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