Re: [PATCH 2/2 -mm] mm: brk: dwongrade mmap_sem to read when shrinking

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To: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 2/2 -mm] mm: brk: dwongrade mmap_sem to read when shrinking
From: Michal Hocko <mhocko@xxxxxxxxxx>
Date: Wed, 26 Sep 2018 10:17:08 +0200
Cc: kirill@xxxxxxxxxxxxx, willy@xxxxxxxxxxxxx, ldufour@xxxxxxxxxxxxxxxxxx, vbabka@xxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <1537922816-108051-2-git-send-email-yang.shi@linux.alibaba.com>
References: <1537922816-108051-1-git-send-email-yang.shi@linux.alibaba.com> <1537922816-108051-2-git-send-email-yang.shi@linux.alibaba.com>
User-agent: Mutt/1.10.1 (2018-07-13)

On Wed 26-09-18 08:46:56, Yang Shi wrote:
> brk might be used to shinrk memory mapping too. Use __do_munmap() to
> shrink mapping with downgrading mmap_sem to read.

same comment wrt the changelog as for the previous patch.
-- 
Michal Hocko
SUSE Labs

References:
- [PATCH 1/2 -mm] mm: mremap: dwongrade mmap_sem to read when shrinking
  - From: Yang Shi
- [PATCH 2/2 -mm] mm: brk: dwongrade mmap_sem to read when shrinking
  - From: Yang Shi

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