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

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Date:   Fri, 19 Aug 2016 17:49:38 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <guohanjun@...wei.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <will.deacon@....com>,
        <mhocko@...e.com>, <dave.hansen@...el.com>, <sudeep.holla@....com>,
        <catalin.marinas@....com>, <mark.rutland@....com>,
        <robh+dt@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <mike.kravetz@...cle.com>, <n-horiguchi@...jp.nec.com>,
        <hillf.zj@...baba-inc.com>, <dingel@...ux.vnet.ibm.com>,
        <sfr@...b.auug.org.au>, <kirill.shutemov@...ux.intel.com>,
        <sudeep.holla@....com>
Subject: Re: [RFC PATCH] arm64/hugetlb enable gigantic hugepage

add more,

hi all,
Could anyone do me a favor and give some comments?

Thanks
Xie Yisheng

On 2016/8/18 20:05, Xie Yisheng wrote:
> As we know, arm64 also support gigantic hugepage eg. 1G.
> So I try to use this function by adding hugepagesz=1G
> in kernel parameters, with CONFIG_CMA=y.
> However, when:
> echo xx > /sys/kernel/mm/hugepages/hugepages-1048576kB/
>           nr_hugepages
> it failed with the info:
> -bash: echo: write error: Invalid argument
> 
> This patch make gigantic hugepage can be used on arm64,
> when CONFIG_CMA=y or other related configs is enable.
> 
> Signed-off-by: Xie Yisheng <xieyisheng1@...wei.com>
> ---
>  mm/hugetlb.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> 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))
>  static void destroy_compound_gigantic_page(struct page *page,
>