From: Ruan Shiyang <ruansy.fnst@cn.fujitsu.com> To: Matthew Wilcox <willy@infradead.org> 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, 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: Mon, 10 Aug 2020 16:15:50 +0800 [thread overview] Message-ID: <9673ed3c-9e42-3d01-000b-b01cda9832ce@cn.fujitsu.com> (raw) In-Reply-To: <20200807133857.GC17456@casper.infradead.org> On 2020/8/7 下午9:38, Matthew Wilcox wrote: > 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. > The memory-failure needs to track owners info from a dax page, so I should associate the owner with this page. In this version, I associate the block device to the dax page, so that the memory-failure is able to iterate the owners by the query interface provided by filesystem. -- Thanks, Ruan Shiyang. > > _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org
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From: Ruan Shiyang <ruansy.fnst@cn.fujitsu.com> To: Matthew Wilcox <willy@infradead.org> 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: Mon, 10 Aug 2020 16:15:50 +0800 [thread overview] Message-ID: <9673ed3c-9e42-3d01-000b-b01cda9832ce@cn.fujitsu.com> (raw) In-Reply-To: <20200807133857.GC17456@casper.infradead.org> On 2020/8/7 下午9:38, Matthew Wilcox wrote: > 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. > The memory-failure needs to track owners info from a dax page, so I should associate the owner with this page. In this version, I associate the block device to the dax page, so that the memory-failure is able to iterate the owners by the query interface provided by filesystem. -- Thanks, Ruan Shiyang. > >
next prev parent reply other threads:[~2020-08-10 8:16 UTC|newest] Thread overview: 32+ 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 ` Shiyang Ruan 2020-08-07 13:13 ` [RFC PATCH 1/8] fs: introduce get_shared_files() for dax&reflink Shiyang Ruan 2020-08-07 13:13 ` Shiyang Ruan 2020-08-07 16:15 ` Darrick J. Wong 2020-08-07 16:15 ` Darrick J. Wong 2020-08-10 8:07 ` Ruan Shiyang 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 ` 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 ` Shiyang Ruan 2020-08-07 13:13 ` [RFC PATCH 4/8] fsdax: copy data before write Shiyang Ruan 2020-08-07 13:13 ` 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 ` 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 ` 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 ` Shiyang Ruan 2020-08-07 13:13 ` [RFC PATCH 8/8] fs/xfs: support dedupe for fsdax Shiyang Ruan 2020-08-07 13:13 ` Shiyang Ruan 2020-08-07 15:38 ` kernel test robot 2020-08-07 15:54 ` kernel test robot 2020-08-07 13:38 ` [RFC PATCH 0/8] fsdax: introduce FS query interface to support reflink Matthew Wilcox 2020-08-07 13:38 ` Matthew Wilcox 2020-08-10 8:15 ` Ruan Shiyang [this message] 2020-08-10 8:15 ` Ruan Shiyang 2020-08-10 11:16 ` Matthew Wilcox 2020-08-10 11:16 ` Matthew Wilcox 2020-08-10 21:10 ` Dave Chinner 2020-08-10 21:10 ` Dave Chinner
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