From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Sagi Grimberg <sagi@grimberg.me>
Cc: linux-xfs@vger.kernel.org, Jan Kara <jack@suse.cz>,
Arnd Bergmann <arnd@arndb.de>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
Linux API <linux-api@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
Dave Chinner <david@fromorbit.com>,
Christoph Hellwig <hch@lst.de>,
"J. Bruce Fields" <bfields@fieldses.org>,
Linux MM <linux-mm@kvack.org>,
Jeff Layton <jlayton@poochiereds.net>,
Al Viro <viro@zeniv.linux.org.uk>,
Andy Lutomirski <luto@kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v9 0/6] MAP_DIRECT for DAX userspace flush
Date: Thu, 19 Oct 2017 00:02:49 -0600 [thread overview]
Message-ID: <20171019060249.GA6555@obsidianresearch.com> (raw)
In-Reply-To: <e29eb9ed-2d87-cde8-4efa-50de1fff0c04@grimberg.me>
On Mon, Oct 16, 2017 at 03:02:52PM +0300, Sagi Grimberg wrote:
> But why should the kernel ever need to mangle the CQ? if a lease break
> would deregister the MR the device is expected to generate remote
> protection errors on its own.
The point is to avoid protection errors - hittles change over when the
DAX mapping changes like ODP does.
Theonly way to get there is to notify the app before the mappings
change.. Dan suggested having ibv_pollcq return this indication..
Jason
_______________________________________________
Linux-nvdimm mailing list
Linux-nvdimm@lists.01.org
https://lists.01.org/mailman/listinfo/linux-nvdimm
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Sagi Grimberg <sagi@grimberg.me>
Cc: Dan Williams <dan.j.williams@intel.com>,
"J. Bruce Fields" <bfields@fieldses.org>, Jan Kara <jack@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
Linux API <linux-api@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
Dave Chinner <david@fromorbit.com>,
linux-xfs@vger.kernel.org, Linux MM <linux-mm@kvack.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Andy Lutomirski <luto@kernel.org>,
Jeff Layton <jlayton@poochiereds.net>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v9 0/6] MAP_DIRECT for DAX userspace flush
Date: Thu, 19 Oct 2017 00:02:49 -0600 [thread overview]
Message-ID: <20171019060249.GA6555@obsidianresearch.com> (raw)
In-Reply-To: <e29eb9ed-2d87-cde8-4efa-50de1fff0c04@grimberg.me>
On Mon, Oct 16, 2017 at 03:02:52PM +0300, Sagi Grimberg wrote:
> But why should the kernel ever need to mangle the CQ? if a lease break
> would deregister the MR the device is expected to generate remote
> protection errors on its own.
The point is to avoid protection errors - hittles change over when the
DAX mapping changes like ODP does.
Theonly way to get there is to notify the app before the mappings
change.. Dan suggested having ibv_pollcq return this indication..
Jason
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WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Sagi Grimberg <sagi@grimberg.me>
Cc: Dan Williams <dan.j.williams@intel.com>,
"J. Bruce Fields" <bfields@fieldses.org>, Jan Kara <jack@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
Linux API <linux-api@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
Dave Chinner <david@fromorbit.com>,
linux-xfs@vger.kernel.org, Linux MM <linux-mm@kvack.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Andy Lutomirski <luto@kernel.org>,
Jeff Layton <jlayton@poochiereds.net>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v9 0/6] MAP_DIRECT for DAX userspace flush
Date: Thu, 19 Oct 2017 00:02:49 -0600 [thread overview]
Message-ID: <20171019060249.GA6555@obsidianresearch.com> (raw)
In-Reply-To: <e29eb9ed-2d87-cde8-4efa-50de1fff0c04@grimberg.me>
On Mon, Oct 16, 2017 at 03:02:52PM +0300, Sagi Grimberg wrote:
> But why should the kernel ever need to mangle the CQ? if a lease break
> would deregister the MR the device is expected to generate remote
> protection errors on its own.
The point is to avoid protection errors - hittles change over when the
DAX mapping changes like ODP does.
Theonly way to get there is to notify the app before the mappings
change.. Dan suggested having ibv_pollcq return this indication..
Jason
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Sagi Grimberg <sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
Cc: Dan Williams
<dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
"J. Bruce Fields"
<bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>,
Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
"Darrick J. Wong"
<darrick.wong-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org"
<linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org>,
Dave Chinner <david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org>,
linux-xfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Linux MM <linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>,
Al Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
Andy Lutomirski <luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Jeff Layton <jlayton-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org>,
linux-fsdevel
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: Re: [PATCH v9 0/6] MAP_DIRECT for DAX userspace flush
Date: Thu, 19 Oct 2017 00:02:49 -0600 [thread overview]
Message-ID: <20171019060249.GA6555@obsidianresearch.com> (raw)
In-Reply-To: <e29eb9ed-2d87-cde8-4efa-50de1fff0c04-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
On Mon, Oct 16, 2017 at 03:02:52PM +0300, Sagi Grimberg wrote:
> But why should the kernel ever need to mangle the CQ? if a lease break
> would deregister the MR the device is expected to generate remote
> protection errors on its own.
The point is to avoid protection errors - hittles change over when the
DAX mapping changes like ODP does.
Theonly way to get there is to notify the app before the mappings
change.. Dan suggested having ibv_pollcq return this indication..
Jason
next prev parent reply other threads:[~2017-10-19 5:59 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-12 0:47 [PATCH v9 0/6] MAP_DIRECT for DAX userspace flush Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` [PATCH v9 1/6] mm: introduce MAP_SHARED_VALIDATE, a mechanism to safely define new mmap flags Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 13:51 ` Jan Kara
2017-10-12 13:51 ` Jan Kara
2017-10-12 13:51 ` Jan Kara
2017-10-12 13:51 ` Jan Kara
2017-10-12 16:32 ` Linus Torvalds
2017-10-12 16:32 ` Linus Torvalds
2017-10-12 16:32 ` Linus Torvalds
2017-10-16 7:38 ` Christoph Hellwig
2017-10-16 7:38 ` Christoph Hellwig
2017-10-16 7:38 ` Christoph Hellwig
2017-10-16 7:56 ` Jan Kara
2017-10-16 7:56 ` Jan Kara
2017-10-16 7:56 ` Jan Kara
2017-10-12 0:47 ` [PATCH v9 2/6] fs, mm: pass fd to ->mmap_validate() Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 1:21 ` Al Viro
2017-10-12 1:21 ` Al Viro
2017-10-12 1:21 ` Al Viro
2017-10-12 1:21 ` Al Viro
2017-10-12 1:28 ` Dan Williams
2017-10-12 1:28 ` Dan Williams
2017-10-12 1:28 ` Dan Williams
2017-10-12 1:28 ` Dan Williams
2017-10-12 2:17 ` Dan Williams
2017-10-12 2:17 ` Dan Williams
2017-10-12 2:17 ` Dan Williams
2017-10-12 2:17 ` Dan Williams
2017-10-12 3:44 ` Dan Williams
2017-10-12 3:44 ` Dan Williams
2017-10-12 3:44 ` Dan Williams
2017-10-12 3:44 ` Dan Williams
2017-10-12 0:47 ` [PATCH v9 3/6] fs: MAP_DIRECT core Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` [PATCH v9 4/6] xfs: prepare xfs_break_layouts() for reuse with MAP_DIRECT Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` [PATCH v9 5/6] fs, xfs, iomap: introduce break_layout_nowait() Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` [PATCH v9 6/6] xfs: wire up MAP_DIRECT Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 0:47 ` Dan Williams
2017-10-12 14:23 ` [PATCH v9 0/6] MAP_DIRECT for DAX userspace flush Christoph Hellwig
2017-10-12 14:23 ` Christoph Hellwig
2017-10-12 14:23 ` Christoph Hellwig
2017-10-12 17:41 ` Dan Williams
2017-10-12 17:41 ` Dan Williams
2017-10-12 17:41 ` Dan Williams
2017-10-13 6:57 ` Christoph Hellwig
2017-10-13 6:57 ` Christoph Hellwig
2017-10-13 6:57 ` Christoph Hellwig
2017-10-13 15:14 ` Dan Williams
2017-10-13 15:14 ` Dan Williams
2017-10-13 15:14 ` Dan Williams
2017-10-13 16:38 ` Jason Gunthorpe
2017-10-13 16:38 ` Jason Gunthorpe
2017-10-13 16:38 ` Jason Gunthorpe
2017-10-13 16:38 ` Jason Gunthorpe
2017-10-13 17:01 ` Dan Williams
2017-10-13 17:01 ` Dan Williams
2017-10-13 17:01 ` Dan Williams
2017-10-13 17:01 ` Dan Williams
2017-10-13 17:31 ` Jason Gunthorpe
2017-10-13 17:31 ` Jason Gunthorpe
2017-10-13 17:31 ` Jason Gunthorpe
2017-10-13 17:31 ` Jason Gunthorpe
2017-10-13 18:22 ` Dan Williams
2017-10-13 18:22 ` Dan Williams
2017-10-13 18:22 ` Dan Williams
2017-10-13 18:22 ` Dan Williams
2017-10-14 1:57 ` Jason Gunthorpe
2017-10-14 1:57 ` Jason Gunthorpe
2017-10-14 1:57 ` Jason Gunthorpe
2017-10-14 1:57 ` Jason Gunthorpe
2017-10-16 12:02 ` Sagi Grimberg
2017-10-16 12:02 ` Sagi Grimberg
2017-10-19 6:02 ` Jason Gunthorpe [this message]
2017-10-19 6:02 ` Jason Gunthorpe
2017-10-19 6:02 ` Jason Gunthorpe
2017-10-19 6:02 ` Jason Gunthorpe
2017-10-16 7:30 ` Christoph Hellwig
2017-10-16 7:30 ` Christoph Hellwig
2017-10-16 7:30 ` Christoph Hellwig
2017-10-16 7:26 ` Christoph Hellwig
2017-10-16 7:26 ` Christoph Hellwig
2017-10-16 7:26 ` Christoph Hellwig
2017-10-16 12:07 ` Sagi Grimberg
2017-10-16 12:07 ` Sagi Grimberg
2017-10-16 12:07 ` Sagi Grimberg
2017-10-16 17:43 ` Dan Williams
2017-10-16 17:43 ` Dan Williams
2017-10-16 17:43 ` Dan Williams
2017-10-16 19:44 ` Dan Williams
2017-10-16 19:44 ` Dan Williams
2017-10-16 19:44 ` Dan Williams
2017-10-17 6:46 ` Christoph Hellwig
2017-10-17 6:46 ` Christoph Hellwig
2017-10-17 6:46 ` Christoph Hellwig
2017-10-17 6:46 ` Christoph Hellwig
2017-10-16 7:22 ` Christoph Hellwig
2017-10-16 7:22 ` Christoph Hellwig
2017-10-16 7:22 ` Christoph Hellwig
2017-10-16 7:22 ` Christoph Hellwig
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