linux-kernel - Re: [PATCH] mm, memory_hotplug: Don't bail out in do_migrate

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Message-ID: <b0618ef7-8537-f85b-4cba-9a6fb75602f0@redhat.com>
Date:   Tue, 11 Dec 2018 11:35:16 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Oscar Salvador <osalvador@...e.de>, akpm@...ux-foundation.org,
        pasha.tatashin@...een.com, dan.j.williams@...il.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm, memory_hotplug: Don't bail out in do_migrate_range
 prematurely

On 11.12.18 11:20, Michal Hocko wrote:
> On Tue 11-12-18 10:35:53, David Hildenbrand wrote:
>> So somehow remember if we had issues with one page and instead of
>> reporting 0, report e.g. -EAGAIN?
> 
> There is no consumer of the return value right now and it is not really
> clear whether we need one. I would just make do_migrate_range return void.
> 

Well, this would allow optimizations like "No need to check if
everything has been migrated, I can tell you right away that it has been
done".

-- 

Thanks,

David / dhildenb