linux-kernel - Re: [RFC PATCH] arm64/hugetlb enable gigantic hugepage

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Date:   Fri, 19 Aug 2016 12:25:51 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Xie Yisheng <xieyisheng1@...wei.com>
Cc:     akpm@...ux-foundation.org, guohanjun@...wei.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] arm64/hugetlb enable gigantic hugepage

On Thu 18-08-16 20:05:29, Xie Yisheng wrote:
> As we know, arm64 also support gigantic hugepage eg. 1G.

Well, I do not know that. How can I check?

Anyway to the patch
[...]
> index 87e11d8..b4d8048 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1022,7 +1022,8 @@ static int hstate_next_node_to_free(struct hstate *h, nodemask_t *nodes_allowed)
>  		((node = hstate_next_node_to_free(hs, mask)) || 1);	\
>  		nr_nodes--)
>  
> -#if (defined(CONFIG_X86_64) || defined(CONFIG_S390)) && \
> +#if (defined(CONFIG_X86_64) || defined(CONFIG_S390) || \
> +	defined(CONFIG_ARM64)) && \
>  	((defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || \
>  	defined(CONFIG_CMA))

this ifdef is getting pretty unwieldy. For one thing I think that
respective archs should enable ARCH_HAVE_GIGANTIC_PAGES.

>  static void destroy_compound_gigantic_page(struct page *page,
> -- 
> 1.7.12.4
> 
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-- 
Michal Hocko
SUSE Labs