linux-kernel - Re: [PATCH 2/2, v2] mm/migration: Make rmap_walk_anon() and try_to_unmap

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Date:	Sun, 02 Dec 2012 12:53:25 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Christoph Lameter <cl@...ux.com>, Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 2/2, v2] mm/migration: Make rmap_walk_anon() and try_to_unmap_anon()
 more scalable

On 12/02/2012 10:12 AM, Ingo Molnar wrote:

> Rename anon_vma_[un]lock() => anon_vma_[un]lock_write(),
> to make it clearer that it's an exclusive write-lock in
> that case - suggested by Rik van Riel.

... close, but you forgot to actually rename the unlock function :)

> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index 7f5a552..81a9dee 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -101,7 +101,7 @@ extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
>   #define wait_split_huge_page(__anon_vma, __pmd)				\
>   	do {								\
>   		pmd_t *____pmd = (__pmd);				\
> -		anon_vma_lock(__anon_vma);				\
> +		anon_vma_lock_write(__anon_vma);			\
>   		anon_vma_unlock(__anon_vma);				\
>   		BUG_ON(pmd_trans_splitting(*____pmd) ||			\

-- 
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