linux-kernel - Re: [RFC PATCH 4/5] mm, memory_hotplug: print reason for the offlining failure

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Message-ID: <20181108075934.GL27423@dhcp22.suse.cz>
Date:   Thu, 8 Nov 2018 08:59:34 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <OSalvador@...e.com>,
        Baoquan He <bhe@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 4/5] mm, memory_hotplug: print reason for the
 offlining failure

On Thu 08-11-18 11:53:21, Anshuman Khandual wrote:
> 
> 
> On 11/07/2018 03:48 PM, Michal Hocko wrote:
> > From: Michal Hocko <mhocko@...e.com>
> > 
> > The memory offlining failure reporting is inconsistent and insufficient.
> > Some error paths simply do not report the failure to the log at all.
> > When we do report there are no details about the reason of the failure
> > and there are several of them which makes memory offlining failures
> > hard to debug.
> > 
> > Make sure that the
> > 	memory offlining [mem %#010llx-%#010llx] failed
> > message is printed for all failures and also provide a short textual
> > reason for the failure e.g.
> > 
> > [ 1984.506184] rac1 kernel: memory offlining [mem 0x82600000000-0x8267fffffff] failed due to signal backoff
> > 
> > this tells us that the offlining has failed because of a signal pending
> > aka user intervention.
> > 
> > Signed-off-by: Michal Hocko <mhocko@...e.com>
> 
> It might help to enumerate these failure reason strings and use macros.

Does it really make sense when all of them are on-off things? I would
agree if they were reused somewhere.

-- 
Michal Hocko
SUSE Labs