linux-kernel - Re: [PATCH v2] mm: clean up hwpoison page cache page in fault path

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Message-ID: <YhOLmvLKOCO0qDIe@localhost.localdomain>
Date:   Mon, 21 Feb 2022 13:54:50 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     Rik van Riel <riel@...riel.com>, linux-kernel@...r.kernel.org,
        kernel-team@...com, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2] mm: clean up hwpoison page cache page in fault path

On Wed, Feb 16, 2022 at 10:13:14AM +0800, Miaohe Lin wrote:
> IIUC, this could not happen when soft-offlining a pagecache page. They're either
> invalidated or migrated away and then we set PageHWPoison.
> I think this may happen on a clean pagecache page when it's isolated. So it's !PageLRU.
> And identify_page_state treats it as me_unknown because it's non reserved, slab, swapcache
> and so on ...(see error_states for details). Or am I miss anything?

But the path you are talking about is when we do have a non-recoverable
error, so memory_failure() path.
AFAIU, Rik talks about pages with corrected errors, and that is
soft_offline().

-- 
Oscar Salvador
SUSE Labs