linux-kernel - Re: poisoned pages do not play well in the buddy allocator

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Message-ID: <20190826111414.GG7538@dhcp22.suse.cz>
Date:   Mon, 26 Aug 2019 13:14:14 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Oscar Salvador <osalvador@...e.de>
Cc:     n-horiguchi@...jp.nec.com, mike.kravetz@...cle.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org, vbabka@...e.cz
Subject: Re: poisoned pages do not play well in the buddy allocator

On Mon 26-08-19 12:41:50, Oscar Salvador wrote:
[...]
> I checked [1], and it seems that [2] was going towards fixing this kind of issue.
> 
> I think it is about time to revamp the whole thing.

I completely agree. The current state of hwpoison is just too fragile to
be practically usable. We keep getting bug reports (as pointed out by
Oscar) when people try to test this via soft offlining. 

> @Naoya: I could give it a try if you are busy.

That would be more than appreciated. I feel guilty to have it slip
between cracks but I simply couldn't have found enough time to give it a
serious look. Sorry about that.

> [1] https://lore.kernel.org/linux-mm/1541746035-13408-1-git-send-email-n-horiguchi@ah.jp.nec.com/
> [2] https://lore.kernel.org/linux-mm/1541746035-13408-9-git-send-email-n-horiguchi@ah.jp.nec.com/

-- 
Michal Hocko
SUSE Labs