linux-kernel - Re: [PATCH 2/2 -mm] mm: brk: dwongrade mmap

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Message-ID: <20180926081708.GG6278@dhcp22.suse.cz>
Date:   Wed, 26 Sep 2018 10:17:08 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     kirill@...temov.name, willy@...radead.org,
        ldufour@...ux.vnet.ibm.com, vbabka@...e.cz,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2 -mm] mm: brk: dwongrade mmap_sem to read when
 shrinking

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