On Mon, Jul 22, 2019 at 08:58:04AM -0300, Jason Gunthorpe wrote:
> No one has given me a satisfactory answer about the restriction
> either.
>
> The only thing this kconfig controls that could possibly be arch
> specific is the page walking code in hmm_range_snapshot and
> related.
>
> Maybe the
On Fri, Jul 19, 2019 at 01:38:28PM -0700, John Hubbard wrote:
> On 7/19/19 5:04 AM, Pavel Machek wrote:
> > On Fri 2019-07-19 05:00:43, Christoph Hellwig wrote:
> >> On Fri, Jul 19, 2019 at 08:48:53AM -0300, Jason Gunthorpe wrote:
> >>> It is like MMU_NOTIFIERS, if something needs it, then it will
On 7/19/19 5:04 AM, Pavel Machek wrote:
> On Fri 2019-07-19 05:00:43, Christoph Hellwig wrote:
>> On Fri, Jul 19, 2019 at 08:48:53AM -0300, Jason Gunthorpe wrote:
>>> It is like MMU_NOTIFIERS, if something needs it, then it will select
>>> it.
>>>
>>> Maybe it should just be a hidden kconfig anyhow
On Fri 2019-07-19 05:00:43, Christoph Hellwig wrote:
> On Fri, Jul 19, 2019 at 08:48:53AM -0300, Jason Gunthorpe wrote:
> > It is like MMU_NOTIFIERS, if something needs it, then it will select
> > it.
> >
> > Maybe it should just be a hidden kconfig anyhow as there is no reason
> > to turn it on w
On Fri, Jul 19, 2019 at 08:48:53AM -0300, Jason Gunthorpe wrote:
> It is like MMU_NOTIFIERS, if something needs it, then it will select
> it.
>
> Maybe it should just be a hidden kconfig anyhow as there is no reason
> to turn it on without also turning on a using driver.
We can't just select it d
On Fri, Jul 19, 2019 at 12:52:39PM +0200, Pavel Machek wrote:
> On Thu 2019-07-18 22:57:48, Christoph Hellwig wrote:
> > On Thu, Jul 18, 2019 at 06:32:53PM -0700, john.hubb...@gmail.com wrote:
> > > + HMM_MIRROR provides a way to mirror ranges of the CPU page tables
> > > + of a process into a
On Thu 2019-07-18 22:57:48, Christoph Hellwig wrote:
> On Thu, Jul 18, 2019 at 06:32:53PM -0700, john.hubb...@gmail.com wrote:
> > + HMM_MIRROR provides a way to mirror ranges of the CPU page tables
> > + of a process into a device page table. Here, mirror means "keep
> > + synchronized
On Thu, Jul 18, 2019 at 06:32:53PM -0700, john.hubb...@gmail.com wrote:
> + HMM_MIRROR provides a way to mirror ranges of the CPU page tables
> + of a process into a device page table. Here, mirror means "keep
> + synchronized". Prerequisites: the device must provide the ability
>
On 7/18/19 9:34 PM, Ira Weiny wrote:
> On Thu, Jul 18, 2019 at 06:32:53PM -0700, john.hubb...@gmail.com wrote:
>> From: John Hubbard
...
>> + Select HMM_MIRROR if you have hardware that meets the above
>> + description. An early, partial list of such hardware is:
>> + an NVIDIA GPU
On Thu, Jul 18, 2019 at 06:32:53PM -0700, john.hubb...@gmail.com wrote:
> From: John Hubbard
>
> The HMM_MIRROR option in Kconfig is a little underdocumented and
> mysterious, and leaves people wondering whether to enable it.
>
> Add text explaining just a little bit more about HMM, and also
> m
From: John Hubbard
The HMM_MIRROR option in Kconfig is a little underdocumented and
mysterious, and leaves people wondering whether to enable it.
Add text explaining just a little bit more about HMM, and also
mention which hardware would benefit from having HMM_MIRROR
enabled.
Suggested-by: Pav
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