linux-kernel - RE: [PATCH v2] mm, hwpoison: Try to recover from copy-on write faults

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Message-ID: <1643d19d795b4a8084228eab66a7db9f@AcuMS.aculab.com>
Date:   Fri, 21 Oct 2022 04:11:23 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Tony Luck' <tony.luck@...el.com>,
        Shuai Xue <xueshuai@...ux.alibaba.com>
CC:     Naoya Horiguchi <naoya.horiguchi@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        "Matthew Wilcox" <willy@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: RE: [PATCH v2] mm, hwpoison: Try to recover from copy-on write faults

From: Tony Luck
> Sent: 21 October 2022 05:08
....
> When we do return to user mode the task is going to be busy servicing
> a SIGBUS ... so shouldn't try to touch the poison page before the
> memory_failure() called by the worker thread cleans things up.

What about an RT process on a busy system?
The worker threads are pretty low priority.

	David

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