linux-kernel - Re: Infinite looping observed in __offline

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Date:   Wed, 01 Aug 2018 21:09:39 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Michal Hocko <mhocko@...nel.org>, John Allen <jallen@...ux.ibm.com>
Cc:     n-horiguchi@...jp.nec.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, kamezawa.hiroyu@...fujitsu.com,
        mgorman@...e.de
Subject: Re: Infinite looping observed in __offline_pages

Michal Hocko <mhocko@...nel.org> writes:
> On Wed 25-07-18 13:11:15, John Allen wrote:
> [...]
>> Does a failure in do_migrate_range indicate that the range is unmigratable
>> and the loop in __offline_pages should terminate and goto failed_removal? Or
>> should we allow a certain number of retrys before we
>> give up on migrating the range?
>
> Unfortunatelly not. Migration code doesn't tell a difference between
> ephemeral and permanent failures.

What's to stop an ephemeral failure happening repeatedly?

cheers