linux-kernel - Re: [PATCH] mm/page_alloc: Add a reason for reserved pages in has_unmovable

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Message-ID: <20191004130713.GK9578@dhcp22.suse.cz>
Date:   Fri, 4 Oct 2019 15:07:13 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Qian Cai <cai@....pw>
Cc:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Oscar Salvador <osalvador@...e.de>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/page_alloc: Add a reason for reserved pages in
 has_unmovable_pages()

On Fri 04-10-19 08:56:16, Qian Cai wrote:
[...]
> It might be a good time to rethink if it is really a good idea to dump_page()
> at all inside has_unmovable_pages(). As it is right now, it is a a potential
> deadlock between console vs memory offline. More details are in this thread,
> 
> https://lore.kernel.org/lkml/1568817579.5576.172.camel@lca.pw/

Huh. That would imply we cannot do any printk from that path, no?
-- 
Michal Hocko
SUSE Labs