linux-kernel - RE: [PATCH] thp: Fix deadlock situation in vma

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Date:	Mon, 12 Aug 2013 16:55:09 +0300 (EEST)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Ning Qu <quning@...il.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-fsdevel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Dave Hansen <dave@...1.net>, linux-mm@...ck.org,
	Hillf Danton <dhillf@...il.com>, Ning Qu <quning@...gle.com>
Subject: RE: [PATCH] thp: Fix deadlock situation in vma_adjust with huge page
 in page cache

Ning Qu wrote:
> In vma_adjust, the current code grabs i_mmap_mutex before calling
> vma_adjust_trans_huge. This used to be fine until huge page in page
> cache comes in. The problem is the underlying function
> split_file_huge_page will also grab the i_mmap_mutex before splitting
> the huge page in page cache. Obviously this is causing deadlock
> situation.
> 
> This fix is to move the vma_adjust_trans_huge before grab the lock for
> file, the same as what the function is currently doing for anonymous
> memory.
> 
> Tested, everything works fine so far.
> 
> Signed-off-by: Ning Qu <quning@...gle.com>

Thanks, applied.

-- 
 Kirill A. Shutemov
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