From: Dave Chinner <david@fromorbit.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: "mhocko@suse.com" <mhocko@suse.com>,
"jack@suse.cz" <jack@suse.cz>,
"benh@kernel.crashing.org" <benh@kernel.crashing.org>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"heiko.carstens@de.ibm.com" <heiko.carstens@de.ibm.com>,
"bfields@fieldses.org" <bfields@fieldses.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"paulus@samba.org" <paulus@samba.org>,
"Hefty, Sean" <sean.hefty@intel.com>,
"jlayton@poochiereds.net" <jlayton@poochiereds.net>,
"mawilcox@microsoft.com" <mawilcox@microsoft.com>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"mpe@ellerman.id.au" <mpe@ellerman.id.au>,
"dledford@redhat.com" <dledford@redhat.com>,
"hch@lst.de" <hch@lst.de>,
"jgunthorpe@obsidianresearch.com"
<jgunthorpe@obsidianresearch.com>,
"hal.rosenstock@gmail.com" <hal.rosenstock@gmail.com>,
"schwidefsky@de.ibm.com" <schwidefsky@de.ibm.com>,
"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
"gerald.schaefer@de.ibm.com" <gerald.schaefer@de.ibm.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
"darrick.wong@oracle.com" <darrick.wong@oracle.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"kirill.shutemov@linux.intel.com"
<kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH v3 00/13] dax: fix dma vs truncate and remove 'page-less' support
Date: Mon, 30 Oct 2017 08:52:33 +1100 [thread overview]
Message-ID: <20171029215233.GF3666@dastard> (raw)
In-Reply-To: <CAA9_cmdx7T2jnfw6TvL0_3ytfs-h-X06uF3_7Ex-YP12YKpwng@mail.gmail.com>
On Fri, Oct 27, 2017 at 01:42:16PM +0200, Dan Williams wrote:
> [replying from my phone, please forgive formatting]
>
> On Friday, October 27, 2017, Dave Chinner <david@fromorbit.com> wrote:
>
>
> > > Here are the two primary patches in
> > > the series, do you think the extent-busy approach would be cleaner?
> >
> > The XFS_DAXDMA....
> >
> > $DEITY that patch is so ugly I can't even bring myself to type it.
>
>
> Right, and so is the problem it's trying to solve. So where do you want to
> go from here?
>
> I could go back to the FL_ALLOCATED approach, but use page idle callbacks
> instead of polling for the lease end notification. Or do we want to try
> busy extents? My concern with busy extents is that it requires more per-fs
> code.
I don't care if it takes more per-fs code to solve the problem -
dumping butt-ugly, nasty locking crap into filesystems that
filesystem developers are completely unable to test is about the
worst possible solution you can come up with.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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WARNING: multiple messages have this Message-ID (diff)
From: Dave Chinner <david@fromorbit.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: "mhocko@suse.com" <mhocko@suse.com>,
"jack@suse.cz" <jack@suse.cz>,
"benh@kernel.crashing.org" <benh@kernel.crashing.org>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"heiko.carstens@de.ibm.com" <heiko.carstens@de.ibm.com>,
"bfields@fieldses.org" <bfields@fieldses.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"paulus@samba.org" <paulus@samba.org>,
"Hefty, Sean" <sean.hefty@intel.com>,
"jlayton@poochiereds.net" <jlayton@poochiereds.net>,
"mawilcox@microsoft.com" <mawilcox@microsoft.com>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"mpe@ellerman.id.au" <mpe@ellerman.id.au>,
"dledford@redhat.com" <dledford@redhat.com>,
"hch@lst.de" <hch@lst.de>,
"jgunthorpe@obsidianresearch.com"
<jgunthorpe@obsidianresearch.com>,
"hal.rosenstock@gmail.com" <hal.rosenstock@gmail.com>,
"schwidefsky@de.ibm.com" <schwidefsky@de.ibm.com>,
viro@zeniv.linux.
Subject: Re: [PATCH v3 00/13] dax: fix dma vs truncate and remove 'page-less' support
Date: Mon, 30 Oct 2017 08:52:33 +1100 [thread overview]
Message-ID: <20171029215233.GF3666@dastard> (raw)
In-Reply-To: <CAA9_cmdx7T2jnfw6TvL0_3ytfs-h-X06uF3_7Ex-YP12YKpwng@mail.gmail.com>
On Fri, Oct 27, 2017 at 01:42:16PM +0200, Dan Williams wrote:
> [replying from my phone, please forgive formatting]
>
> On Friday, October 27, 2017, Dave Chinner <david@fromorbit.com> wrote:
>
>
> > > Here are the two primary patches in
> > > the series, do you think the extent-busy approach would be cleaner?
> >
> > The XFS_DAXDMA....
> >
> > $DEITY that patch is so ugly I can't even bring myself to type it.
>
>
> Right, and so is the problem it's trying to solve. So where do you want to
> go from here?
>
> I could go back to the FL_ALLOCATED approach, but use page idle callbacks
> instead of polling for the lease end notification. Or do we want to try
> busy extents? My concern with busy extents is that it requires more per-fs
> code.
I don't care if it takes more per-fs code to solve the problem -
dumping butt-ugly, nasty locking crap into filesystems that
filesystem developers are completely unable to test is about the
worst possible solution you can come up with.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: Dave Chinner <david@fromorbit.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: "mhocko@suse.com" <mhocko@suse.com>,
"jack@suse.cz" <jack@suse.cz>,
"benh@kernel.crashing.org" <benh@kernel.crashing.org>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"heiko.carstens@de.ibm.com" <heiko.carstens@de.ibm.com>,
"bfields@fieldses.org" <bfields@fieldses.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"paulus@samba.org" <paulus@samba.org>,
"Hefty, Sean" <sean.hefty@intel.com>,
"jlayton@poochiereds.net" <jlayton@poochiereds.net>,
"mawilcox@microsoft.com" <mawilcox@microsoft.com>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"mpe@ellerman.id.au" <mpe@ellerman.id.au>,
"dledford@redhat.com" <dledford@redhat.com>,
"hch@lst.de" <hch@lst.de>,
"jgunthorpe@obsidianresearch.com"
<jgunthorpe@obsidianresearch.com>,
"hal.rosenstock@gmail.com" <hal.rosenstock@gmail.com>,
"schwidefsky@de.ibm.com" <schwidefsky@de.ibm.com>,
"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
"gerald.schaefer@de.ibm.com" <gerald.schaefer@de.ibm.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
"darrick.wong@oracle.com" <darrick.wong@oracle.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"kirill.shutemov@linux.intel.com"
<kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH v3 00/13] dax: fix dma vs truncate and remove 'page-less' support
Date: Mon, 30 Oct 2017 08:52:33 +1100 [thread overview]
Message-ID: <20171029215233.GF3666@dastard> (raw)
In-Reply-To: <CAA9_cmdx7T2jnfw6TvL0_3ytfs-h-X06uF3_7Ex-YP12YKpwng@mail.gmail.com>
On Fri, Oct 27, 2017 at 01:42:16PM +0200, Dan Williams wrote:
> [replying from my phone, please forgive formatting]
>
> On Friday, October 27, 2017, Dave Chinner <david@fromorbit.com> wrote:
>
>
> > > Here are the two primary patches in
> > > the series, do you think the extent-busy approach would be cleaner?
> >
> > The XFS_DAXDMA....
> >
> > $DEITY that patch is so ugly I can't even bring myself to type it.
>
>
> Right, and so is the problem it's trying to solve. So where do you want to
> go from here?
>
> I could go back to the FL_ALLOCATED approach, but use page idle callbacks
> instead of polling for the lease end notification. Or do we want to try
> busy extents? My concern with busy extents is that it requires more per-fs
> code.
I don't care if it takes more per-fs code to solve the problem -
dumping butt-ugly, nasty locking crap into filesystems that
filesystem developers are completely unable to test is about the
worst possible solution you can come up with.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2017-10-29 21:52 UTC|newest]
Thread overview: 143+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-20 2:38 [PATCH v3 00/13] dax: fix dma vs truncate and remove 'page-less' support Dan Williams
2017-10-20 2:38 ` Dan Williams
2017-10-20 2:38 ` Dan Williams
2017-10-20 2:38 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 01/13] dax: quiet bdev_dax_supported() Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 02/13] dax: require 'struct page' for filesystem dax Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 7:57 ` Christoph Hellwig
2017-10-20 7:57 ` Christoph Hellwig
2017-10-20 15:23 ` Dan Williams
2017-10-20 15:23 ` Dan Williams
2017-10-20 15:23 ` Dan Williams
2017-10-20 16:29 ` Christoph Hellwig
2017-10-20 16:29 ` Christoph Hellwig
2017-10-20 16:29 ` Christoph Hellwig
2017-10-20 16:29 ` Christoph Hellwig
2017-10-20 22:29 ` Dan Williams
2017-10-20 22:29 ` Dan Williams
2017-10-20 22:29 ` Dan Williams
2017-10-21 3:20 ` Matthew Wilcox
2017-10-21 3:20 ` Matthew Wilcox
2017-10-21 3:20 ` Matthew Wilcox
2017-10-21 4:16 ` Dan Williams
2017-10-21 4:16 ` Dan Williams
2017-10-21 4:16 ` Dan Williams
2017-10-21 8:15 ` Christoph Hellwig
2017-10-21 8:15 ` Christoph Hellwig
2017-10-21 8:15 ` Christoph Hellwig
2017-10-23 5:18 ` Martin Schwidefsky
2017-10-23 5:18 ` Martin Schwidefsky
2017-10-23 5:18 ` Martin Schwidefsky
2017-10-23 8:55 ` Dan Williams
2017-10-23 8:55 ` Dan Williams
2017-10-23 10:44 ` Martin Schwidefsky
2017-10-23 10:44 ` Martin Schwidefsky
2017-10-23 10:44 ` Martin Schwidefsky
2017-10-23 11:20 ` Dan Williams
2017-10-23 11:20 ` Dan Williams
2017-10-23 11:20 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 03/13] dax: stop using VM_MIXEDMAP for dax Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 04/13] dax: stop using VM_HUGEPAGE " Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 05/13] dax: stop requiring a live device for dax_flush() Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 06/13] dax: store pfns in the radix Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 07/13] dax: warn if dma collides with truncate Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 08/13] tools/testing/nvdimm: add 'bio_delay' mechanism Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 09/13] IB/core: disable memory registration of fileystem-dax vmas Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 10/13] mm: disable get_user_pages_fast() for dax Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` [PATCH v3 11/13] fs: use smp_load_acquire in break_{layout,lease} Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 2:39 ` Dan Williams
2017-10-20 12:39 ` Jeffrey Layton
2017-10-20 12:39 ` Jeffrey Layton
2017-10-20 12:39 ` Jeffrey Layton
2017-10-20 12:39 ` Jeffrey Layton
2017-10-20 2:40 ` [PATCH v3 12/13] dax: handle truncate of dma-busy pages Dan Williams
2017-10-20 2:40 ` Dan Williams
2017-10-20 2:40 ` Dan Williams
2017-10-20 13:05 ` Jeff Layton
2017-10-20 13:05 ` Jeff Layton
2017-10-20 13:05 ` Jeff Layton
2017-10-20 15:42 ` Dan Williams
2017-10-20 15:42 ` Dan Williams
2017-10-20 15:42 ` Dan Williams
2017-10-20 16:32 ` Christoph Hellwig
2017-10-20 16:32 ` Christoph Hellwig
2017-10-20 16:32 ` Christoph Hellwig
2017-10-20 17:27 ` Dan Williams
2017-10-20 17:27 ` Dan Williams
2017-10-20 17:27 ` Dan Williams
2017-10-20 20:36 ` Brian Foster
2017-10-20 20:36 ` Brian Foster
2017-10-20 20:36 ` Brian Foster
2017-10-21 8:11 ` Christoph Hellwig
2017-10-21 8:11 ` Christoph Hellwig
2017-10-20 2:40 ` [PATCH v3 13/13] xfs: wire up FL_ALLOCATED support Dan Williams
2017-10-20 2:40 ` Dan Williams
2017-10-20 2:40 ` Dan Williams
2017-10-20 7:47 ` [PATCH v3 00/13] dax: fix dma vs truncate and remove 'page-less' support Christoph Hellwig
2017-10-20 7:47 ` Christoph Hellwig
2017-10-20 7:47 ` Christoph Hellwig
2017-10-20 7:47 ` Christoph Hellwig
2017-10-20 9:31 ` Christoph Hellwig
2017-10-20 9:31 ` Christoph Hellwig
2017-10-20 9:31 ` Christoph Hellwig
2017-10-26 10:58 ` Jan Kara
2017-10-26 10:58 ` Jan Kara
2017-10-26 10:58 ` Jan Kara
2017-10-26 10:58 ` Jan Kara
2017-10-26 23:51 ` Williams, Dan J
2017-10-26 23:51 ` Williams, Dan J
2017-10-26 23:51 ` Williams, Dan J
2017-10-26 23:51 ` Williams, Dan J
2017-10-27 6:48 ` Dave Chinner
2017-10-27 6:48 ` Dave Chinner
2017-10-27 6:48 ` Dave Chinner
2017-10-27 6:48 ` Dave Chinner
2017-10-27 6:48 ` Dave Chinner
2017-10-27 11:42 ` Dan Williams
2017-10-27 11:42 ` Dan Williams
2017-10-27 11:42 ` Dan Williams
2017-10-29 21:52 ` Dave Chinner [this message]
2017-10-29 21:52 ` Dave Chinner
2017-10-29 21:52 ` Dave Chinner
2017-10-27 6:45 ` Christoph Hellwig
2017-10-27 6:45 ` Christoph Hellwig
2017-10-27 6:45 ` Christoph Hellwig
2017-10-29 23:46 ` Dan Williams
2017-10-29 23:46 ` Dan Williams
2017-10-29 23:46 ` Dan Williams
2017-10-30 2:00 ` Dave Chinner
2017-10-30 2:00 ` Dave Chinner
2017-10-30 2:00 ` Dave Chinner
2017-10-30 2:00 ` Dave Chinner
2017-10-30 8:38 ` Jan Kara
2017-10-30 8:38 ` Jan Kara
2017-10-30 8:38 ` Jan Kara
2017-10-30 11:20 ` Dave Chinner
2017-10-30 11:20 ` Dave Chinner
2017-10-30 11:20 ` Dave Chinner
2017-10-30 11:20 ` Dave Chinner
2017-10-30 17:51 ` Dan Williams
2017-10-30 17:51 ` Dan Williams
2017-10-30 17:51 ` Dan Williams
2017-10-30 17:51 ` Dan Williams
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