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Date:   Tue, 9 Jun 2020 15:43:09 +0200
From:   Michal Hocko <mhocko@kernel.org>
To:     js1304@gmail.com
Cc:     Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, kernel-team@lge.com,
        Vlastimil Babka <vbabka@suse.cz>,
        Christoph Hellwig <hch@infradead.org>,
        Roman Gushchin <guro@fb.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [PATCH v2 05/12] mm/hugetlb: unify hugetlb migration callback
 function
Message-ID: <20200609134309.GG22623@dhcp22.suse.cz>
References: <1590561903-13186-1-git-send-email-iamjoonsoo.kim@lge.com>
 <1590561903-13186-6-git-send-email-iamjoonsoo.kim@lge.com>
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On Wed 27-05-20 15:44:56, Joonsoo Kim wrote:
[...]
> -/* page migration callback function */
>  struct page *alloc_huge_page_nodemask(struct hstate *h,
>  				struct alloc_control *ac)
>  {
>  	ac->gfp_mask |= htlb_alloc_mask(h);
> +	if (ac->nid == NUMA_NO_NODE)
> +		ac->gfp_mask &= ~__GFP_THISNODE;

Is this really needed? alloc_huge_page_node is currently only called
from numa migration code and the target node should be always defined.

>  
>  	spin_lock(&hugetlb_lock);
>  	if (h->free_huge_pages - h->resv_huge_pages > 0) {
> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> index 3b6b551..e705efd 100644
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -1073,9 +1073,10 @@ struct page *alloc_new_node_page(struct page *page, unsigned long node)
>  		struct alloc_control ac = {
>  			.nid = node,
>  			.nmask = NULL,
> +			.gfp_mask = __GFP_THISNODE,
>  		};
>  
> -		return alloc_huge_page_node(h, &ac);
> +		return alloc_huge_page_nodemask(h, &ac);
>  	} else if (PageTransHuge(page)) {
>  		struct page *thp;
>  
> -- 
> 2.7.4
> 

-- 
Michal Hocko
SUSE Labs