linux-kernel - Re: [RFC PATCH v2 10/16] mm,hwpoison: Rework soft offline for free pages

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Message-ID: <20191022103319.GA21736@linux>
Date:   Tue, 22 Oct 2019 12:33:25 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     n-horiguchi@...jp.nec.com, mike.kravetz@...cle.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 10/16] mm,hwpoison: Rework soft offline for free
 pages

On Tue, Oct 22, 2019 at 12:24:57PM +0200, Michal Hocko wrote:
> Yes, that makes a perfect sense. What I am saying that the migration
> (aka trying to recover) is the main and only difference. The soft
> offline should poison page tables when not able to migrate as well
> IIUC.

Yeah, I see your point.
I do not really why soft-offline strived so much to left the page
untouched unless it was able to content the problem.

Note that if we start now to poison pages even if we could not 
content them (in soft-offline mode), that is a big and visible user
change.

Not saying it is wrong, but something to consider.

Anyway, I would like to put that aside as a follow-up
rework after this one, as this one already changes quite
some things.

-- 
Oscar Salvador
SUSE L3