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

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Message-ID: <63f930e411655a6ad37d4818d0ae19784c82f076.camel@surriel.com>
Date:   Tue, 15 Feb 2022 10:01:20 -0500
From:   Rik van Riel <riel@...riel.com>
To:     David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org
Cc:     kernel-team@...com, linux-mm@...ck.org,
        Miaohe Lin <linmiaohe@...wei.com>,
        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 Tue, 2022-02-15 at 12:22 +0100, David Hildenbrand wrote:
> On 13.02.22 03:37, Rik van Riel wrote:
> > Sometimes the page offlining code can leave behind a hwpoisoned
> > clean
> > page cache page. This can lead to programs being killed over and
> > over
> > and over again as they fault in the hwpoisoned page, get killed,
> > and
> > then get re-spawned by whatever wanted to run them.
> 
> Hi Rik,
> 
> am I correct that you are only talking about soft offlining as
> triggered
> from mm/memory-failure.c, not page offlining as in memory offlining
> mm/memory_hotunplug.c ?

That is correct in that I am talking only about memory-failure.c,
however the code in memory-failure.c has both hard and soft
offlining modes, and I suppose this patch covers both?

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