On the 28th of August 2014 at 09:17, Dave Chinner wrote:
On Wed, Aug 27, 2014 at 02:30:55PM -0700, Andrew Morton wrote:
On Wed, 27 Aug 2014 16:22:20 -0500 (CDT) Christoph Lameter
wrote:
Some explanation of why one would use ext4 instead of, say,
suitably-modified ramfs/tmpfs/rd/etc?
The NVD
On Thu, 2014-08-28 at 11:08 +0300, Boaz Harrosh wrote:
> On 08/27/2014 06:45 AM, 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
On Wed, Aug 27, 2014 at 06:30:27PM -0700, Andy Lutomirski wrote:
> 4) No page faults ever once a page is writable (I hope -- I'm not sure
> whether this series actually achieves that goal).
I can't think of a circumstance in which you'd end up taking a page fault
after a writable mapping is establ
On Wed, Aug 27, 2014 at 02:46:22PM -0700, Andrew Morton wrote:
> > > Sat down to read all this but I'm finding it rather unwieldy - it's
> > > just a great blob of code. Is there some overall
> > > what-it-does-and-how-it-does-it roadmap?
> >
> > The overall goal is to map persistent memory / NV-
On 08/27/2014 06:45 AM, 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 ex
On Wed, Aug 27, 2014 at 02:30:55PM -0700, Andrew Morton wrote:
> On Wed, 27 Aug 2014 16:22:20 -0500 (CDT) Christoph Lameter
> wrote:
>
> > > Some explanation of why one would use ext4 instead of, say,
> > > suitably-modified ramfs/tmpfs/rd/etc?
> >
> > The NVDIMM contents survive reboot and the
On 08/27/2014 02:46 PM, Andrew Morton wrote:
> I assume (because I wasn't told!) that there are two objectives here:
>
> 1) reduce memory consumption by not maintaining pagecache and
> 2) reduce CPU cost by avoiding the double-copies.
>
> These things are pretty easily quantified. And really the
On Wed, 27 Aug 2014 14:30:55 -0700
Andrew Morton wrote:
> On Wed, 27 Aug 2014 16:22:20 -0500 (CDT) Christoph Lameter
> wrote:
>
> > > Some explanation of why one would use ext4 instead of, say,
> > > suitably-modified ramfs/tmpfs/rd/etc?
> >
> > The NVDIMM contents survive reboot and therefor
On Wed, 27 Aug 2014 17:12:50 -0400 Matthew Wilcox wrote:
> On Wed, Aug 27, 2014 at 01:06:13PM -0700, Andrew Morton wrote:
> > On Tue, 26 Aug 2014 23:45:20 -0400 Matthew Wilcox
> > wrote:
> >
> > > One of the primary uses for NV-DIMMs is to expose them as a block device
> > > and use a filesyst
On Wed, 27 Aug 2014 16:22:20 -0500 (CDT) Christoph Lameter
wrote:
> > Some explanation of why one would use ext4 instead of, say,
> > suitably-modified ramfs/tmpfs/rd/etc?
>
> The NVDIMM contents survive reboot and therefore ramfs and friends wont
> work with it.
See "suitably modified". Pres
On Wed, 27 Aug 2014, Andrew Morton wrote:
> Sat down to read all this but I'm finding it rather unwieldy - it's
> just a great blob of code. Is there some overall
> what-it-does-and-how-it-does-it roadmap?
Matthew gave a talk about DAX at the kernel summit. Its a great feature
because this is an
On Wed, Aug 27, 2014 at 01:06:13PM -0700, Andrew Morton wrote:
> On Tue, 26 Aug 2014 23:45:20 -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 w
On Tue, 26 Aug 2014 23:45:20 -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
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
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