linux-kernel - Re: [PATCH 3/3] mm/mmap.c: extract __vma_unlink_list as counter part for __vma_link

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Message-ID: <20190821005234.GA5540@richard>
Date:   Wed, 21 Aug 2019 08:52:34 +0800
From:   Wei Yang <richardw.yang@...ux.intel.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        Wei Yang <richardw.yang@...ux.intel.com>,
        Christoph Hellwig <hch@...radead.org>,
        akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        osalvador@...e.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mm/mmap.c: extract __vma_unlink_list as counter part
 for __vma_link_list

On Tue, Aug 20, 2019 at 10:26:29AM -0700, Matthew Wilcox wrote:
>On Wed, Aug 14, 2019 at 11:19:37AM +0200, Vlastimil Babka wrote:
>> On 8/14/19 8:57 AM, Wei Yang wrote:
>> > On Tue, Aug 13, 2019 at 10:16:11PM -0700, Christoph Hellwig wrote:
>> >>Btw, is there any good reason we don't use a list_head for vma linkage?
>> > 
>> > Not sure, maybe there is some historical reason?
>> 
>> Seems it was single-linked until 2010 commit 297c5eee3724 ("mm: make the vma
>> list be doubly linked") and I guess it was just simpler to add the vm_prev link.
>> 
>> Conversion to list_head might be an interesting project for some "advanced
>> beginner" in the kernel :)
>
>I'm working to get rid of vm_prev and vm_next, so it would probably be
>wasted effort.

You mean replace it with list_head?

-- 
Wei Yang
Help you, Help me