From: Matthew Wilcox <willy@infradead.org>
To: Shiyang Ruan <ruansy.fnst@cn.fujitsu.com>
Cc: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-nvdimm@lists.01.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, darrick.wong@oracle.com,
dan.j.williams@intel.com, david@fromorbit.com, hch@lst.de,
rgoldwyn@suse.de, qi.fuli@fujitsu.com, y-goto@fujitsu.com
Subject: Re: [RFC PATCH 0/8] fsdax: introduce FS query interface to support reflink
Date: Fri, 7 Aug 2020 14:38:57 +0100 [thread overview]
Message-ID: <20200807133857.GC17456@casper.infradead.org> (raw)
In-Reply-To: <20200807131336.318774-1-ruansy.fnst@cn.fujitsu.com>
On Fri, Aug 07, 2020 at 09:13:28PM +0800, Shiyang Ruan wrote:
> This patchset is a try to resolve the problem of tracking shared page
> for fsdax.
>
> Instead of per-page tracking method, this patchset introduces a query
> interface: get_shared_files(), which is implemented by each FS, to
> obtain the owners of a shared page. It returns an owner list of this
> shared page. Then, the memory-failure() iterates the list to be able
> to notify each process using files that sharing this page.
>
> The design of the tracking method is as follow:
> 1. dax_assocaite_entry() associates the owner's info to this page
I think that's the first problem with this design. dax_associate_entry is
a horrendous idea which needs to be ripped out, not made more important.
It's all part of the general problem of trying to do something on a
per-page basis instead of per-extent basis.
next prev parent reply other threads:[~2020-08-07 13:39 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-07 13:13 [RFC PATCH 0/8] fsdax: introduce FS query interface to support reflink Shiyang Ruan
2020-08-07 13:13 ` [RFC PATCH 1/8] fs: introduce get_shared_files() for dax&reflink Shiyang Ruan
2020-08-07 16:15 ` Darrick J. Wong
2020-08-10 8:07 ` Ruan Shiyang
2020-08-07 13:13 ` [RFC PATCH 2/8] fsdax, mm: track files sharing dax page for memory-failure Shiyang Ruan
2020-08-07 13:13 ` [RFC PATCH 3/8] fsdax: introduce dax_copy_edges() for COW Shiyang Ruan
2020-08-07 13:13 ` [RFC PATCH 4/8] fsdax: copy data before write Shiyang Ruan
2020-08-07 13:13 ` [RFC PATCH 5/8] fsdax: replace mmap entry in case of CoW Shiyang Ruan
2020-08-07 13:13 ` [RFC PATCH 6/8] fsdax: dedup file range to use a compare function Shiyang Ruan
2020-08-07 13:13 ` [RFC PATCH 7/8] fs/xfs: handle CoW for fsdax write() path Shiyang Ruan
2020-08-07 13:13 ` [RFC PATCH 8/8] fs/xfs: support dedupe for fsdax Shiyang Ruan
2020-08-07 13:38 ` Matthew Wilcox [this message]
2020-08-10 8:15 ` [RFC PATCH 0/8] fsdax: introduce FS query interface to support reflink Ruan Shiyang
2020-08-10 11:16 ` Matthew Wilcox
2020-08-10 21:10 ` Dave Chinner
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