From: "ruansy.fnst@fujitsu.com" <ruansy.fnst@fujitsu.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-xfs <linux-xfs@vger.kernel.org>,
linux-nvdimm <linux-nvdimm@lists.01.org>,
Linux MM <linux-mm@kvack.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
device-mapper development <dm-devel@redhat.com>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
david <david@fromorbit.com>, Christoph Hellwig <hch@lst.de>,
Alasdair Kergon <agk@redhat.com>,
Mike Snitzer <snitzer@redhat.com>,
Goldwyn Rodrigues <rgoldwyn@suse.de>,
"qi.fuli@fujitsu.com" <qi.fuli@fujitsu.com>,
"y-goto@fujitsu.com" <y-goto@fujitsu.com>
Subject: Re: [PATCH v3 01/11] pagemap: Introduce ->memory_failure()
Date: Mon, 8 Mar 2021 03:38:21 +0000 [thread overview]
Message-ID: <OSBPR01MB29207A1C06968705C2FEBACFF4939@OSBPR01MB2920.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <CAPcyv4jqEdPoF5YM+jSYJd74KqRTwbbEum7=moa3=Wyn6UyU9g@mail.gmail.com>
> On Mon, Feb 8, 2021 at 2:55 AM Shiyang Ruan <ruansy.fnst@cn.fujitsu.com> 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 block device where
> > the error page locates in, and try to get the filesystem on this block
> > device. And finally call filesystem handler to deal with the error.
> > The filesystem will try to recover the corrupted data if possiable.
> >
> > Signed-off-by: Shiyang Ruan <ruansy.fnst@cn.fujitsu.com>
> > ---
> > include/linux/memremap.h | 8 ++++++++
> > 1 file changed, 8 insertions(+)
> >
> > diff --git a/include/linux/memremap.h b/include/linux/memremap.h
> > index 79c49e7f5c30..0bcf2b1e20bd 100644
> > --- a/include/linux/memremap.h
> > +++ b/include/linux/memremap.h
> > @@ -87,6 +87,14 @@ struct dev_pagemap_ops {
> > * the page back to a CPU accessible page.
> > */
> > vm_fault_t (*migrate_to_ram)(struct vm_fault *vmf);
> > +
> > + /*
> > + * Handle the memory failure happens on one page. Notify the processes
> > + * who are using this page, and try to recover the data on this page
> > + * if necessary.
> > + */
> > + int (*memory_failure)(struct dev_pagemap *pgmap, unsigned long pfn,
> > + int flags);
> > };
>
> After the conversation with Dave I don't see the point of this. If
> there is a memory_failure() on a page, why not just call
> memory_failure()? That already knows how to find the inode and the
> filesystem can be notified from there.
We want memory_failure() supports reflinked files. In this case, we are not
able to track multiple files from a page(this broken page) because
page->mapping,page->index can only track one file. Thus, I introduce this
->memory_failure() implemented in pmem driver, to call ->corrupted_range()
upper level to upper level, and finally find out files who are
using(mmapping) this page.
>
> Although memory_failure() is inefficient for large range failures, I'm
> not seeing a better option, so I'm going to test calling
> memory_failure() over a large range whenever an in-use dax-device is
> hot-removed.
>
I did not test this for large range failure yet... I am not sure if it works
fine. But because of the complex tracking method, I think it would be more
inefficient in this case than before.
--
Thanks,
Ruan Shiyang.
next prev parent reply other threads:[~2021-03-08 3:46 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-08 10:55 [PATCH v3 00/11] fsdax: introduce fs query to support reflink Shiyang Ruan
2021-02-08 10:55 ` [PATCH v3 01/11] pagemap: Introduce ->memory_failure() Shiyang Ruan
2021-02-10 13:20 ` Christoph Hellwig
2021-03-06 20:36 ` Dan Williams
2021-03-08 3:38 ` ruansy.fnst [this message]
2021-03-08 5:23 ` Dan Williams
2021-03-08 11:34 ` ruansy.fnst
2021-03-08 18:01 ` Dan Williams
2021-03-12 10:18 ` ruansy.fnst
2021-03-19 2:17 ` ruansy.fnst
2021-03-24 2:19 ` Dan Williams
2021-03-24 7:47 ` Christoph Hellwig
2021-03-24 16:37 ` Dan Williams
2021-03-24 17:39 ` Christoph Hellwig
2021-03-24 18:00 ` Dan Williams
2021-02-08 10:55 ` [PATCH v3 02/11] blk: Introduce ->corrupted_range() for block device Shiyang Ruan
2021-02-10 13:21 ` Christoph Hellwig
2021-03-04 22:42 ` Darrick J. Wong
2021-03-05 6:10 ` Christoph Hellwig
2021-02-08 10:55 ` [PATCH v3 03/11] fs: Introduce ->corrupted_range() for superblock Shiyang Ruan
2021-02-08 10:55 ` [PATCH v3 04/11] block_dev: Introduce bd_corrupted_range() for block device Shiyang Ruan
2021-02-08 10:55 ` [PATCH v3 05/11] mm, fsdax: Refactor memory-failure handler for dax mapping Shiyang Ruan
2021-02-10 13:33 ` Christoph Hellwig
2021-02-17 2:56 ` Ruan Shiyang
2021-02-18 8:32 ` Christoph Hellwig
2021-02-18 8:59 ` Ruan Shiyang
2021-03-16 3:21 ` zhong jiang
2021-03-17 3:46 ` ruansy.fnst
2021-02-08 10:55 ` [PATCH v3 06/11] mm, pmem: Implement ->memory_failure() in pmem driver Shiyang Ruan
2021-02-10 13:41 ` Christoph Hellwig
2021-02-08 10:55 ` [PATCH v3 07/11] pmem: Implement ->corrupted_range() for " Shiyang Ruan
2021-02-08 10:55 ` [PATCH v3 08/11] dm: Introduce ->rmap() to find bdev offset Shiyang Ruan
2021-02-08 10:55 ` [PATCH v3 09/11] md: Implement ->corrupted_range() Shiyang Ruan
2021-02-08 10:55 ` [PATCH v3 10/11] xfs: Implement ->corrupted_range() for XFS Shiyang Ruan
2021-02-10 13:44 ` Christoph Hellwig
2021-02-08 10:55 ` [PATCH v3 11/11] fs/dax: Remove useless functions Shiyang Ruan
2021-02-10 13:09 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=OSBPR01MB29207A1C06968705C2FEBACFF4939@OSBPR01MB2920.jpnprd01.prod.outlook.com \
--to=ruansy.fnst@fujitsu.com \
--cc=agk@redhat.com \
--cc=dan.j.williams@intel.com \
--cc=darrick.wong@oracle.com \
--cc=david@fromorbit.com \
--cc=dm-devel@redhat.com \
--cc=hch@lst.de \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-nvdimm@lists.01.org \
--cc=linux-xfs@vger.kernel.org \
--cc=qi.fuli@fujitsu.com \
--cc=rgoldwyn@suse.de \
--cc=snitzer@redhat.com \
--cc=y-goto@fujitsu.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).