From: Jane Chu <jane.chu@oracle.com>
To: Shiyang Ruan <ruansy.fnst@fujitsu.com>,
linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
nvdimm@lists.linux.dev, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, dm-devel@redhat.com
Cc: djwong@kernel.org, dan.j.williams@intel.com, david@fromorbit.com,
hch@lst.de, agk@redhat.com, snitzer@redhat.com
Subject: Re: [PATCH RESEND v6 1/9] pagemap: Introduce ->memory_failure()
Date: Mon, 16 Aug 2021 10:20:05 -0700 [thread overview]
Message-ID: <de19af2a-e9e6-0d43-8b14-c13b9ec38a9d@oracle.com> (raw)
In-Reply-To: <1d286104-28f4-d442-efed-4344eb8fa5a1@oracle.com>
Hi, ShiYang,
So I applied the v6 patch series to my 5.14-rc3 as it's what you
indicated is what v6 was based at, and injected a hardware poison.
I'm seeing the same problem that was reported a while ago after the
poison was consumed - in the SIGBUS payload, the si_addr is missing:
** SIGBUS(7): canjmp=1, whichstep=0, **
** si_addr(0x(nil)), si_lsb(0xC), si_code(0x4, BUS_MCEERR_AR) **
The si_addr ought to be 0x7f6568000000 - the vaddr of the first page
in this case.
Something is not right...
thanks,
-jane
On 8/5/2021 6:17 PM, Jane Chu wrote:
> The filesystem part of the pmem failure handling is at minimum built
> on PAGE_SIZE granularity - an inheritance from general memory_failure
> handling. However, with Intel's DCPMEM technology, the error blast
> radius is no more than 256bytes, and might get smaller with future
> hardware generation, also advanced atomic 64B write to clear the poison.
> But I don't see any of that could be incorporated in, given that the
> filesystem is notified a corruption with pfn, rather than an exact
> address.
>
> So I guess this question is also for Dan: how to avoid unnecessarily
> repairing a PMD range for a 256B corrupt range going forward?
>
> thanks,
> -jane
>
>
> On 7/30/2021 3:01 AM, Shiyang Ruan wrote:
>> When memory-failure occurs, we call this function which is implemented
>> by each kind of devices. For the fsdax case, pmem device driver
>> implements it. Pmem device driver will find out the filesystem in which
>> the corrupted page located in. And finally call filesystem handler to
>> deal with this error.
>>
>> The filesystem will try to recover the corrupted data if necessary.
>
next prev parent reply other threads:[~2021-08-16 17:20 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-30 10:01 [PATCH RESEND v6 0/9] fsdax: introduce fs query to support reflink Shiyang Ruan
2021-07-30 10:01 ` [PATCH RESEND v6 1/9] pagemap: Introduce ->memory_failure() Shiyang Ruan
2021-08-06 1:17 ` Jane Chu
2021-08-16 17:20 ` Jane Chu [this message]
2021-08-17 1:44 ` ruansy.fnst
2021-08-18 5:43 ` Jane Chu
2021-08-18 6:08 ` Jane Chu
2021-08-18 7:52 ` ruansy.fnst
2021-08-18 17:10 ` Dan Williams
2021-08-23 13:21 ` hch
2021-08-18 15:52 ` Darrick J. Wong
2021-08-19 7:18 ` Jane Chu
2021-08-19 8:11 ` Jane Chu
2021-08-19 9:10 ` ruansy.fnst
2021-08-19 20:50 ` Jane Chu
2021-08-20 16:07 ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 2/9] dax: Introduce holder for dax_device Shiyang Ruan
2021-08-06 1:02 ` Jane Chu
2021-08-17 1:45 ` ruansy.fnst
2021-08-20 16:06 ` Dan Williams
2021-08-20 20:19 ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 3/9] mm: factor helpers for memory_failure_dev_pagemap Shiyang Ruan
2021-08-06 1:00 ` Jane Chu
2021-08-20 16:54 ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 4/9] pmem,mm: Implement ->memory_failure in pmem driver Shiyang Ruan
2021-08-20 20:51 ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 5/9] mm: Introduce mf_dax_kill_procs() for fsdax case Shiyang Ruan
2021-08-06 0:59 ` Jane Chu
2021-08-20 22:40 ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 6/9] xfs: Implement ->notify_failure() for XFS Shiyang Ruan
2021-08-06 0:50 ` Jane Chu
2021-08-20 22:56 ` Dan Williams
2021-08-20 22:59 ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 7/9] dm: Introduce ->rmap() to find bdev offset Shiyang Ruan
2021-08-20 23:46 ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 8/9] md: Implement dax_holder_operations Shiyang Ruan
2021-08-06 0:48 ` Jane Chu
2021-08-17 1:59 ` ruansy.fnst
2021-07-30 10:01 ` [PATCH RESEND v6 9/9] fsdax: add exception for reflinked files Shiyang Ruan
2021-08-06 0:46 ` Jane Chu
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