linux-kernel - Re: [PATCH 09/10] mm/hugetlb: narrow the hugetlb_lock protection area during preparing huge page

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Date:   Fri, 7 Aug 2020 21:12:08 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Wei Yang <richard.weiyang@...ux.alibaba.com>
Cc:     mike.kravetz@...cle.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/10] mm/hugetlb: narrow the hugetlb_lock protection
 area during preparing huge page

On 08/07/20 at 05:12pm, Wei Yang wrote:
> set_hugetlb_cgroup_[rsvd] just manipulate page local data, which is not
> necessary to be protected by hugetlb_lock.
> 
> Let's take this out.
> 
> Signed-off-by: Wei Yang <richard.weiyang@...ux.alibaba.com>
> ---
>  mm/hugetlb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 9473eb6800e9..1f2010c9dd8d 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1494,9 +1494,9 @@ static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
>  {
>  	INIT_LIST_HEAD(&page->lru);
>  	set_compound_page_dtor(page, HUGETLB_PAGE_DTOR);
> -	spin_lock(&hugetlb_lock);
>  	set_hugetlb_cgroup(page, NULL);
>  	set_hugetlb_cgroup_rsvd(page, NULL);
> +	spin_lock(&hugetlb_lock);

Looks good to me.

Reviewed-by: Baoquan He <bhe@...hat.com>

>  	h->nr_huge_pages++;
>  	h->nr_huge_pages_node[nid]++;
>  	spin_unlock(&hugetlb_lock);
> -- 
> 2.20.1 (Apple Git-117)
> 
>