linux-kernel - Re: [PATCH 2/2] thp: support split page table lock

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Date:	Tue, 03 Sep 2013 16:52:20 -0400
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	linux-mm@...ck.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Andi Kleen <andi@...stfloor.org>,
	Michal Hocko <mhocko@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	kirill.shutemov@...ux.intel.com,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Alex Thorlton <athorlton@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] thp: support split page table lock

> diff --git v3.11-rc3.orig/mm/huge_memory.c v3.11-rc3/mm/huge_memory.c
> index 243e710..3cb29e1 100644
> --- v3.11-rc3.orig/mm/huge_memory.c
> +++ v3.11-rc3/mm/huge_memory.c
...
> @@ -864,14 +868,17 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
>  	pmd_t pmd;
>  	pgtable_t pgtable;
>  	int ret;
> +	spinlock_t *uninitialized_var(dst_ptl), *uninitialized_var(src_ptl);
>  
>  	ret = -ENOMEM;
>  	pgtable = pte_alloc_one(dst_mm, addr);
>  	if (unlikely(!pgtable))
>  		goto out;
>  
> -	spin_lock(&dst_mm->page_table_lock);
> -	spin_lock_nested(&src_mm->page_table_lock, SINGLE_DEPTH_NESTING);
> +	dst_ptl = huge_pmd_lockptr(dst_mm, dst_ptl);
> +	src_ptl = huge_pmd_lockptr(src_mm, src_ptl);

I found one mistake. This should be:

+	dst_ptl = huge_pmd_lockptr(dst_mm, dst_pmd);
+	src_ptl = huge_pmd_lockptr(src_mm, src_pmd);

Thanks,
Naoya Horiguchi

> +	spin_lock(dst_ptl);
> +	spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING);
>  
>  	ret = -EAGAIN;
>  	pmd = *src_pmd;
--
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