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Date:   Thu, 12 Jul 2018 10:04:18 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>, willy@...radead.org,
        ldufour@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v4 0/3] mm: zap pages with read mmap_sem in munmap for
 large mapping

On Wed 11-07-18 10:04:48, Yang Shi wrote:
[...]
> One approach is to save all the vmas on a separate list, then zap_page_range
> does unmap with this list.

Just detached unmapped vma chain from mm. You can keep the existing
vm_next chain and reuse it.

-- 
Michal Hocko
SUSE Labs

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