On Mon, Sep 21, 2020 at 12:19:07PM -0400, Mikulas Patocka wrote:
>
>
> On Tue, 15 Sep 2020, Dan Williams wrote:
>
> > > TODO:
> > >
> > > - programs run approximately 4% slower when running from Optane-based
> > > persistent memory. Therefore, programs and libraries should use page cache
> > >
On 9/15/20 6:30 PM, Matthew Wilcox wrote:
On Tue, Sep 15, 2020 at 08:34:41AM -0400, Mikulas Patocka wrote:
- when the fsck.nvfs tool mmaps the device /dev/pmem0, the kernel uses
buffer cache for the mapping. The buffer cache slows does fsck by a factor
of 5 to 10. Could it be possible to
On Mon, Sep 21, 2020 at 9:19 AM Mikulas Patocka wrote:
>
>
>
> On Tue, 15 Sep 2020, Dan Williams wrote:
>
> > > TODO:
> > >
> > > - programs run approximately 4% slower when running from Optane-based
> > > persistent memory. Therefore, programs and libraries should use page cache
> > > and not
On Tue, 15 Sep 2020, Dan Williams wrote:
> > TODO:
> >
> > - programs run approximately 4% slower when running from Optane-based
> > persistent memory. Therefore, programs and libraries should use page cache
> > and not DAX mapping.
>
> This needs to be based on platform firmware data f(ACPI
On Tue, 15 Sep 2020, Mikulas Patocka wrote:
> > > - __copy_from_user_inatomic_nocache doesn't flush cache for leading and
> > > trailing bytes.
> >
> > You want copy_user_flushcache(). See how fs/dax.c arranges for
> > dax_copy_from_iter() to route to pmem_copy_from_iter().
>
> Is it
On Tue, 15 Sep 2020, Dan Williams wrote:
> > - when the fsck.nvfs tool mmaps the device /dev/pmem0, the kernel uses
> > buffer cache for the mapping. The buffer cache slows does fsck by a factor
> > of 5 to 10. Could it be possible to change the kernel so that it maps DAX
> > based block
On Tue, Sep 15, 2020 at 5:35 AM Mikulas Patocka wrote:
>
> Hi
>
> I am developing a new filesystem suitable for persistent memory - nvfs.
Nice!
> The goal is to have a small and fast filesystem that can be used on
> DAX-based devices. Nvfs maps the whole device into linear address space
> and
On Tue, 15 Sep 2020, Matthew Wilcox wrote:
> On Tue, Sep 15, 2020 at 08:34:41AM -0400, Mikulas Patocka wrote:
> > - when the fsck.nvfs tool mmaps the device /dev/pmem0, the kernel uses
> > buffer cache for the mapping. The buffer cache slows does fsck by a factor
> > of 5 to 10. Could it be
On Tue, Sep 15, 2020 at 08:34:41AM -0400, Mikulas Patocka wrote:
> - when the fsck.nvfs tool mmaps the device /dev/pmem0, the kernel uses
> buffer cache for the mapping. The buffer cache slows does fsck by a factor
> of 5 to 10. Could it be possible to change the kernel so that it maps DAX
>
