From: "ruansy.fnst@fujitsu.com" <ruansy.fnst@fujitsu.com>
To: Jane Chu <jane.chu@oracle.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>,
"nvdimm@lists.linux.dev" <nvdimm@lists.linux.dev>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"dm-devel@redhat.com" <dm-devel@redhat.com>
Cc: "snitzer@redhat.com" <snitzer@redhat.com>,
"djwong@kernel.org" <djwong@kernel.org>,
"david@fromorbit.com" <david@fromorbit.com>,
"dan.j.williams@intel.com" <dan.j.williams@intel.com>,
"hch@lst.de" <hch@lst.de>, "agk@redhat.com" <agk@redhat.com>
Subject: Re: [dm-devel] [PATCH RESEND v6 1/9] pagemap: Introduce ->memory_failure()
Date: Thu, 19 Aug 2021 09:10:32 +0000 [thread overview]
Message-ID: <OSBPR01MB29203E90FCF9711D8736C8D4F4C09@OSBPR01MB2920.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <ab9b42d8-2b81-9977-c60a-3f419e53f7bc@oracle.com>
> From: Jane Chu <jane.chu@oracle.com>
> Subject: Re: [PATCH RESEND v6 1/9] pagemap: Introduce ->memory_failure()
>
> Sorry, correction in line.
>
> On 8/19/2021 12:18 AM, Jane Chu wrote:
> > Hi, Shiyang,
> >
> > > > > 1) What does it take and cost to make > > >
> > xfs_sb_version_hasrmapbt(&mp->m_sb) to return true?
> > >
> > > Enable rmpabt feature when making xfs filesystem > `mkfs.xfs
> > -m rmapbt=1 /path/to/device` > BTW, reflink is enabled by default.
> >
> > Thanks! I tried
> > mkfs.xfs -d agcount=2,extszinherit=512,su=2m,sw=1 -m reflink=0 -m
> > rmapbt=1 -f /dev/pmem0
> >
> > Again, injected a HW poison to the first page in a dax-file, had the
> > poison consumed and received a SIGBUS. The result is better -
> >
> > ** SIGBUS(7): canjmp=1, whichstep=0, **
> > ** si_addr(0x0x7ff2d8800000), si_lsb(0x15), si_code(0x4,
> > BUS_MCEERR_AR) **
> >
> > The SIGBUS payload looks correct.
> >
> > However, "dmesg" has 2048 lines on sending SIGBUS, one per 512bytes -
>
> Actually that's one per 2MB, even though the poison is located in pfn 0x1850600
> only.
>
> >
> > [ 7003.482326] Memory failure: 0x1850600: Sending SIGBUS to
> > fsdax_poison_v1:4109 due to hardware memory corruption [ 7003.507956]
> > Memory failure: 0x1850800: Sending SIGBUS to
> > fsdax_poison_v1:4109 due to hardware memory corruption [ 7003.531681]
> > Memory failure: 0x1850a00: Sending SIGBUS to
> > fsdax_poison_v1:4109 due to hardware memory corruption [ 7003.554190]
> > Memory failure: 0x1850c00: Sending SIGBUS to
> > fsdax_poison_v1:4109 due to hardware memory corruption [ 7003.575831]
> > Memory failure: 0x1850e00: Sending SIGBUS to
> > fsdax_poison_v1:4109 due to hardware memory corruption [ 7003.596796]
> > Memory failure: 0x1851000: Sending SIGBUS to
> > fsdax_poison_v1:4109 due to hardware memory corruption ....
> > [ 7045.738270] Memory failure: 0x194fe00: Sending SIGBUS to
> > fsdax_poison_v1:4109 due to hardware memory corruption [ 7045.758885]
> > Memory failure: 0x1950000: Sending SIGBUS to
> > fsdax_poison_v1:4109 due to hardware memory corruption [ 7045.779495]
> > Memory failure: 0x1950200: Sending SIGBUS to
> > fsdax_poison_v1:4109 due to hardware memory corruption [ 7045.800106]
> > Memory failure: 0x1950400: Sending SIGBUS to
> > fsdax_poison_v1:4109 due to hardware memory corruption
> >
> > That's too much for a single process dealing with a single poison in a
> > PMD page. If nothing else, given an .si_addr_lsb being 0x15, it
> > doesn't make sense to send a SIGBUS per 512B block.
> >
> > Could you determine the user process' mapping size from the
> > filesystem, and take that as a hint to determine how many iterations
> > to call
> > mf_dax_kill_procs() ?
>
> Sorry, scratch the 512byte stuff... the filesystem has been notified the length of
> the poison blast radius, could it take clue from that?
I think this is caused by a mistake I made in the 6th patch: xfs handler iterates the file range in block size(4k here) even though it is a PMD page. That's why so many message shows when poison on a PMD page. I'll fix it in next version.
--
Thanks,
Ruan.
>
> thanks,
> -jane
>
> >
> > thanks!
> > -jane
> >
> >
> >
--
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next prev parent reply other threads:[~2021-08-19 9:13 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-30 10:01 [dm-devel] [PATCH RESEND v6 0/9] fsdax: introduce fs query to support reflink Shiyang Ruan
2021-07-30 10:01 ` [dm-devel] [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
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 [this message]
2021-08-19 20:50 ` Jane Chu
2021-08-20 16:07 ` Dan Williams
2021-07-30 10:01 ` [dm-devel] [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 ` [dm-devel] [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 ` [dm-devel] [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 ` [dm-devel] [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 ` [dm-devel] [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 ` [dm-devel] [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 ` [dm-devel] [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 ` [dm-devel] [PATCH RESEND v6 9/9] fsdax: add exception for reflinked files Shiyang Ruan
2021-08-06 0:46 ` Jane Chu
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