From: Matthew Wilcox <willy@linux.intel.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v8 00/22] Support ext4 on NV-DIMMs
Date: Wed, 23 Jul 2014 09:59:46 -0400 [thread overview]
Message-ID: <20140723135946.GC6754@linux.intel.com> (raw)
In-Reply-To: <20140723123028.GA11355@node.dhcp.inet.fi>
On Wed, Jul 23, 2014 at 03:30:28PM +0300, Kirill A. Shutemov wrote:
> On Tue, Jul 22, 2014 at 03:47:48PM -0400, Matthew Wilcox wrote:
> > One of the primary uses for NV-DIMMs is to expose them as a block device
> > and use a filesystem to store files on the NV-DIMM. While that works,
> > it currently wastes memory and CPU time buffering the files in the page
> > cache. We have support in ext2 for bypassing the page cache, but it
> > has some races which are unfixable in the current design. This series
> > of patches rewrite the underlying support, and add support for direct
> > access to ext4.
>
> Matthew, as discussed before, your patchset make exessive use of
> i_mmap_mutex. Are you going to address this later? Or what's the plan?
Yes, it'll be addressed later. I have some ideas, but I'd like to get
some experience with just how bad this single mutex is before trying to
split it.
next prev parent reply other threads:[~2014-07-23 13:59 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-22 19:47 [PATCH v8 00/22] Support ext4 on NV-DIMMs Matthew Wilcox
2014-07-22 19:47 ` [PATCH v8 01/22] Fix XIP fault vs truncate race Matthew Wilcox
2014-07-23 11:21 ` Kirill A. Shutemov
2014-07-22 19:47 ` [PATCH v8 02/22] Allow page fault handlers to perform the COW Matthew Wilcox
2014-07-23 11:23 ` Kirill A. Shutemov
2014-07-22 19:47 ` [PATCH v8 03/22] axonram: Fix bug in direct_access Matthew Wilcox
2014-07-23 11:24 ` Kirill A. Shutemov
2014-07-22 19:47 ` [PATCH v8 04/22] Change direct_access calling convention Matthew Wilcox
2014-07-30 16:03 ` Boaz Harrosh
2014-07-30 16:12 ` Boaz Harrosh
2014-07-30 20:34 ` Matthew Wilcox
2014-07-31 10:16 ` Boaz Harrosh
2014-07-30 19:45 ` Matthew Wilcox
2014-07-31 10:11 ` Boaz Harrosh
2014-07-31 14:13 ` Matthew Wilcox
2014-07-31 15:28 ` Boaz Harrosh
2014-07-31 17:19 ` Matthew Wilcox
2014-07-31 18:04 ` Boaz Harrosh
2014-07-31 20:30 ` Zwisler, Ross
2014-08-01 18:45 ` Zwisler, Ross
2014-07-22 19:47 ` [PATCH v8 05/22] Add vm_replace_mixed() Matthew Wilcox
2014-07-23 9:10 ` Jan Kara
2014-07-23 11:45 ` Kirill A. Shutemov
2014-07-23 13:52 ` Matthew Wilcox
2014-07-23 14:20 ` Kirill A. Shutemov
2014-07-23 14:27 ` Matthew Wilcox
2014-07-23 15:55 ` Kirill A. Shutemov
2014-07-24 1:36 ` Zhang, Tianfei
2014-07-25 19:44 ` Matthew Wilcox
2014-07-28 13:25 ` Kirill A. Shutemov
2014-07-29 1:55 ` Zhang, Tianfei
2014-07-22 19:47 ` [PATCH v8 06/22] Introduce IS_DAX(inode) Matthew Wilcox
2014-07-22 19:47 ` [PATCH v8 07/22] Add copy_to_iter(), copy_from_iter() and iov_iter_zero() Matthew Wilcox
2014-07-22 19:47 ` [PATCH v8 08/22] Replace XIP read and write with DAX I/O Matthew Wilcox
2014-07-22 19:47 ` [PATCH v8 09/22] Replace ext2_clear_xip_target with dax_clear_blocks Matthew Wilcox
2014-07-22 19:47 ` [PATCH v8 10/22] Replace the XIP page fault handler with the DAX page fault handler Matthew Wilcox
2014-07-23 12:10 ` Kirill A. Shutemov
2014-07-23 13:55 ` Matthew Wilcox
2014-07-23 14:10 ` [PATCH v8 00/22] Support ext4 on NV-DIMMs Howard Chu
2014-07-23 14:34 ` Matthew Wilcox
2014-07-23 15:28 ` Howard Chu
2014-07-23 20:55 ` Theodore Ts'o
2014-07-23 16:57 ` [PATCH v8 10/22] Replace the XIP page fault handler with the DAX page fault handler Boaz Harrosh
2014-07-23 19:57 ` Matthew Wilcox
2014-07-22 19:47 ` [PATCH v8 11/22] Replace xip_truncate_page with dax_truncate_page Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 12/22] Replace XIP documentation with DAX documentation Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 13/22] Remove get_xip_mem Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 14/22] ext2: Remove ext2_xip_verify_sb() Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 15/22] ext2: Remove ext2_use_xip Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 16/22] ext2: Remove xip.c and xip.h Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 17/22] Remove CONFIG_EXT2_FS_XIP and rename CONFIG_FS_XIP to CONFIG_FS_DAX Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 18/22] ext2: Remove ext2_aops_xip Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 19/22] Get rid of most mentions of XIP in ext2 Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 20/22] xip: Add xip_zero_page_range Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 21/22] ext4: Add DAX functionality Matthew Wilcox
2014-07-22 19:48 ` [PATCH v8 22/22] brd: Rename XIP to DAX Matthew Wilcox
2014-07-23 12:30 ` [PATCH v8 00/22] Support ext4 on NV-DIMMs Kirill A. Shutemov
2014-07-23 13:59 ` Matthew Wilcox [this message]
2014-07-23 15:58 ` Boaz Harrosh
2014-07-23 19:50 ` Matthew Wilcox
2014-07-24 18:51 ` Ross Zwisler
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