linux-kernel - Re: [PATCH] mm, hugetlb: move the error handle logic out of normal code path

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Message-ID: <87oayvngjv.fsf@linux.vnet.ibm.com>
Date:	Sun, 18 May 2014 22:57:16 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Jianyu Zhan <nasa4836@...il.com>, akpm@...ux-foundation.org,
	iamjoonsoo.kim@....com, n-horiguchi@...jp.nec.com, mhocko@...e.cz,
	aarcange@...hat.com, steve.capper@...aro.org, davidlohr@...com,
	kirill.shutemov@...ux.intel.com, dave.hansen@...ux.intel.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	nasa4836@...il.com
Subject: Re: [PATCH] mm, hugetlb: move the error handle logic out of normal code path

Jianyu Zhan <nasa4836@...il.com> writes:

> alloc_huge_page() now mixes normal code path with error handle logic.
> This patches move out the error handle logic, to make normal code
> path more clean and redue code duplicate.
>
> Signed-off-by: Jianyu Zhan <nasa4836@...il.com>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

> ---
>  mm/hugetlb.c | 26 +++++++++++++-------------
>  1 file changed, 13 insertions(+), 13 deletions(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 26b1464..e81c69e 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1246,24 +1246,17 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
>  			return ERR_PTR(-ENOSPC);
>  
>  	ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg);
> -	if (ret) {
> -		if (chg || avoid_reserve)
> -			hugepage_subpool_put_pages(spool, 1);
> -		return ERR_PTR(-ENOSPC);
> -	}
> +	if (ret)
> +		goto out_subpool_put;
> +
>  	spin_lock(&hugetlb_lock);
>  	page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve, chg);
>  	if (!page) {
>  		spin_unlock(&hugetlb_lock);
>  		page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
> -		if (!page) {
> -			hugetlb_cgroup_uncharge_cgroup(idx,
> -						       pages_per_huge_page(h),
> -						       h_cg);
> -			if (chg || avoid_reserve)
> -				hugepage_subpool_put_pages(spool, 1);
> -			return ERR_PTR(-ENOSPC);
> -		}
> +		if (!page)
> +			goto out_uncharge_cgroup;
> +
>  		spin_lock(&hugetlb_lock);
>  		list_move(&page->lru, &h->hugepage_activelist);
>  		/* Fall through */
> @@ -1275,6 +1268,13 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
>  
>  	vma_commit_reservation(h, vma, addr);
>  	return page;
> +
> +out_uncharge_cgroup:
> +	hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg);
> +out_subpool_put:
> +	if (chg || avoid_reserve)
> +		hugepage_subpool_put_pages(spool, 1);
> +	return ERR_PTR(-ENOSPC);
>  }
>  
>  /*
> -- 
> 2.0.0-rc3
>
> --
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