linux-kernel - Re: [RFC PATCH v2 11/16] mm,hwpoison: Rework soft offline for in-use pages

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Message-ID: <20191022094049.GA20429@linux>
Date:   Tue, 22 Oct 2019 11:40:54 +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 11/16] mm,hwpoison: Rework soft offline for in-use
 pages

On Tue, Oct 22, 2019 at 10:30:02AM +0200, Michal Hocko wrote:
> But we have destructors for compound pages. Can we do the heavy lifting
> there?

Yes, we could.
Actually, I tried that approach, but I thought it was simpler this way.
Since there is no hurry in this, I will try to take that up again and
see how it looks.

> > > If the page is free then it shouldn't pin the memcg or any other state.
> > 
> > Well, it is not really free, as it is not usable, is it?
> 
> Sorry I meant to say the page is free from the memcg POV - aka no task
> from the memcg is holding a reference to it. The page is not usable for
> anybody, that is true but no particular memcg should pay a price for
> that. This would mean that random memcgs would end up pinned for ever
> without a good reason.

Sure, I will re-work that.

-- 
Oscar Salvador
SUSE L3