On Mon, Mar 25, 2019 at 03:36:28PM -0700, Dan Williams wrote:
> On Mon, Mar 25, 2019 at 3:22 PM Ira Weiny wrote:
> [..]
> > FWIW this thread is making me think my original patch which simply
> > implemented
> > get_user_pages_fast_longterm() would be more clear. There is some evidence
> > that t
On Mon, Mar 25, 2019 at 3:22 PM Ira Weiny wrote:
[..]
> FWIW this thread is making me think my original patch which simply implemented
> get_user_pages_fast_longterm() would be more clear. There is some evidence
> that the GUP API was trending that way (see get_user_pages_remote). That
> seems
On Mon, Mar 25, 2019 at 02:51:50PM -0300, Jason Gunthorpe wrote:
> On Mon, Mar 25, 2019 at 02:23:15AM -0700, Ira Weiny wrote:
> > > > Unfortunately holding the lock is required to support FOLL_LONGTERM (to
> > > > check
> > > > the VMAs) but we don't want to hold the lock to be optimal
> > > > (s
On Mon, Mar 25, 2019 at 02:23:15AM -0700, Ira Weiny wrote:
> > > Unfortunately holding the lock is required to support FOLL_LONGTERM (to
> > > check
> > > the VMAs) but we don't want to hold the lock to be optimal (specifically
> > > allow
> > > FAULT_FOLL_ALLOW_RETRY). So I'm maintaining the op
On Mon, Mar 25, 2019 at 01:47:13PM -0300, Jason Gunthorpe wrote:
> On Mon, Mar 25, 2019 at 01:42:26AM -0700, Ira Weiny wrote:
> > On Fri, Mar 22, 2019 at 03:12:55PM -0700, Dan Williams wrote:
> > > On Sun, Mar 17, 2019 at 7:36 PM wrote:
> > > >
> > > > From: Ira Weiny
> > > >
> > > > DAX pages we
On Mon, Mar 25, 2019 at 01:42:26AM -0700, Ira Weiny wrote:
> On Fri, Mar 22, 2019 at 03:12:55PM -0700, Dan Williams wrote:
> > On Sun, Mar 17, 2019 at 7:36 PM wrote:
> > >
> > > From: Ira Weiny
> > >
> > > DAX pages were previously unprotected from longterm pins when users
> > > called get_user_p
On Fri, Mar 22, 2019 at 03:12:55PM -0700, Dan Williams wrote:
> On Sun, Mar 17, 2019 at 7:36 PM wrote:
> >
> > From: Ira Weiny
> >
> > DAX pages were previously unprotected from longterm pins when users
> > called get_user_pages_fast().
> >
> > Use the new FOLL_LONGTERM flag to check for DEVMAP p
On Sun, Mar 17, 2019 at 7:36 PM wrote:
>
> From: Ira Weiny
>
> DAX pages were previously unprotected from longterm pins when users
> called get_user_pages_fast().
>
> Use the new FOLL_LONGTERM flag to check for DEVMAP pages and fall
> back to regular GUP processing if a DEVMAP page is encountered
From: Ira Weiny
DAX pages were previously unprotected from longterm pins when users
called get_user_pages_fast().
Use the new FOLL_LONGTERM flag to check for DEVMAP pages and fall
back to regular GUP processing if a DEVMAP page is encountered.
Signed-off-by: Ira Weiny
---
mm/gup.c | 29 ++
