On Mon 07-12-20 16:12:50, Joonsoo Kim wrote:
> On Fri, Dec 04, 2020 at 12:50:56PM -0500, Pavel Tatashin wrote:
> > > > Yes, this indeed could be a problem for some configurations. I will
> > > > add your comment to the commit log of one of the patches.
> > >
> > > It sounds like there is some inher
On Fri, Dec 04, 2020 at 12:50:56PM -0500, Pavel Tatashin wrote:
> > > Yes, this indeed could be a problem for some configurations. I will
> > > add your comment to the commit log of one of the patches.
> >
> > It sounds like there is some inherent tension here, breaking THP's
> > when doing pin_use
> > ZONE_MOVABLE can be configured via kernel parameter, or when memory
> > nodes are onlined after hot-add; so this is something that admins
> > configure. ZONE_MOVABLE is designed to gurantee memory hot-plug
> > functionality, and not availability of THP, however, I did not know
> > about the use
On 04.12.20 18:50, Pavel Tatashin wrote:
>>> Yes, this indeed could be a problem for some configurations. I will
>>> add your comment to the commit log of one of the patches.
>>
>> It sounds like there is some inherent tension here, breaking THP's
>> when doing pin_user_pages() is a really nasty th
> > Yes, this indeed could be a problem for some configurations. I will
> > add your comment to the commit log of one of the patches.
>
> It sounds like there is some inherent tension here, breaking THP's
> when doing pin_user_pages() is a really nasty thing to do. DMA
> benefits greatly from THP.
On Fri, Dec 04, 2020 at 10:55:30AM -0500, Pavel Tatashin wrote:
> On Thu, Dec 3, 2020 at 11:03 PM Joonsoo Kim wrote:
> >
> > Hello,
> >
> > On Wed, Dec 02, 2020 at 12:23:24AM -0500, Pavel Tatashin wrote:
> > > When page is pinned it cannot be moved and its physical address stays
> > > the same unt
On Thu, Dec 3, 2020 at 11:03 PM Joonsoo Kim wrote:
>
> Hello,
>
> On Wed, Dec 02, 2020 at 12:23:24AM -0500, Pavel Tatashin wrote:
> > When page is pinned it cannot be moved and its physical address stays
> > the same until pages is unpinned.
> >
> > This is useful functionality to allows userland
Hello,
On Wed, Dec 02, 2020 at 12:23:24AM -0500, Pavel Tatashin wrote:
> When page is pinned it cannot be moved and its physical address stays
> the same until pages is unpinned.
>
> This is useful functionality to allows userland to implementation DMA
> access. For example, it is used by vfio in
When page is pinned it cannot be moved and its physical address stays
the same until pages is unpinned.
This is useful functionality to allows userland to implementation DMA
access. For example, it is used by vfio in vfio_pin_pages().
However, this functionality breaks memory hotplug/hotremove as
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