From: Jane Chu <jane.chu@oracle.com>
To: linmiaohe@huawei.com, nao.horiguchi@gmail.com,
akpm@linux-foundation.org, osalvador@suse.de, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 0/5] Enhance soft hwpoison handling and injection
Date: Fri, 10 May 2024 00:25:57 -0600 [thread overview]
Message-ID: <20240510062602.901510-1-jane.chu@oracle.com> (raw)
This series aim at the following enhancement -
- Let one hwpoison injector, that is, madvise(MADV_HWPOISON) to behave
more like as if a real UE occurred. Because the other two injectors
such as hwpoison-inject and the 'einj' on x86 can't, and it seems to
me we need a better simulation to real UE scenario.
- For years, if the kernel is unable to unmap a hwpoisoned page, it send
a SIGKILL instead of SIGBUS to prevent user process from potentially
accessing the page again. But in doing so, the user process also lose
important information: vaddr, for recovery. Fortunately, the kernel
already has code to kill process re-accessing a hwpoisoned page, so
remove the '!unmap_success' check.
- Right now, if a thp page under GUP longterm pin is hwpoisoned, and
kernel cannot split the thp page, memory-failure simply ignores
the UE and returns. That's not ideal, it could deliver a SIGBUS with
useful information for userspace recovery.
Changes in v2:
- rebased to mm-stable as of 5/8/2024
- added RB by Oscar Salvador
- comments from Oscar on patch 1-of-3: clarify changelog
- comments from Miahe Lin on patch 3-of-3: remove unnecessary user page
checking and remove incorrect put_page() in kill_procs_now().
Invoke kill_procs_now() regardless MF_ACTIN_REQUIRED is set or not,
moved hwpoison_filter() higher up.
- added two patches 3-of-5 and 4-of-5
Jane Chu (5):
mm/memory-failure: try to send SIGBUS even if unmap failed
mm/madvise: Add MF_ACTION_REQUIRED to madvise(MADV_HWPOISON)
mm/memory-failure: improve memory failure action_result messages
mm/memory-failure: move hwpoison_filter() higher up
mm/memory-failure: send SIGBUS in the event of thp split fail
include/linux/mm.h | 2 +
include/ras/ras_event.h | 2 +
mm/madvise.c | 2 +-
mm/memory-failure.c | 89 +++++++++++++++++++++++++++--------------
4 files changed, 65 insertions(+), 30 deletions(-)
--
2.39.3
next reply other threads:[~2024-05-10 6:26 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-10 6:25 Jane Chu [this message]
2024-05-10 6:25 ` [PATCH v2 1/5] mm/memory-failure: try to send SIGBUS even if unmap failed Jane Chu
2024-05-11 7:01 ` Miaohe Lin
2024-05-10 6:25 ` [PATCH v2 2/5] mm/madvise: Add MF_ACTION_REQUIRED to madvise(MADV_HWPOISON) Jane Chu
2024-05-15 11:44 ` Oscar Salvador
2024-05-10 6:26 ` [PATCH v2 3/5] mm/memory-failure: improve memory failure action_result messages Jane Chu
2024-05-16 9:46 ` Oscar Salvador
2024-05-20 18:30 ` Jane Chu
2024-05-10 6:26 ` [PATCH v2 4/5] mm/memory-failure: move hwpoison_filter() higher up Jane Chu
2024-05-11 8:29 ` Miaohe Lin
2024-05-20 18:15 ` Jane Chu
2024-05-16 10:11 ` Oscar Salvador
2024-05-10 6:26 ` [PATCH v2 5/5] mm/memory-failure: send SIGBUS in the event of thp split fail Jane Chu
2024-05-16 12:47 ` Oscar Salvador
2024-05-20 18:48 ` Jane Chu
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