On 11/30/2016 6:23 PM, Jason Gunthorpe wrote:
>> and O_DIRECT operations that access GPU memory.
> This goes through user space so there is still a VMA..
>
>> Also, HMM's migration between two GPUs could use peer to peer in the
>> kernel, although that is intended to be handled by the GPU driver
On 11/30/2016 8:01 PM, Logan Gunthorpe wrote:
>
>
> On 30/11/16 09:23 AM, Jason Gunthorpe wrote:
>>> Two cases I can think of are RDMA access to an NVMe device's controller
>>> memory buffer,
>>
>> I'm not sure on the use model there..
>
> The NVMe fabrics stuff could probably make use of this.
ould use send_sig_info to send signal from kernel to user space. So
> theoretically GPU driver
> could issue KILL signal to some process.
>
>> On Wed, Nov 30, 2016 at 12:45:58PM +0200, Haggai Eran wrote:
>>> I think we can achieve the kernel's needs with ZONE_DEVICE and D
On 11/28/2016 9:02 PM, Jason Gunthorpe wrote:
> On Mon, Nov 28, 2016 at 06:19:40PM +0000, Haggai Eran wrote:
>>>> GPU memory. We create a non-ODP MR pointing to VRAM but rely on
>>>> user-space and the GPU not to migrate it. If they do, the MR gets
>>>>
On Mon, 2016-11-28 at 09:57 -0700, Jason Gunthorpe wrote:
> On Sun, Nov 27, 2016 at 04:02:16PM +0200, Haggai Eran wrote:
> > I think blocking mmu notifiers against something that is basically
> > controlled by user-space can be problematic. This can block things
> > like
>
On Mon, 2016-11-28 at 09:48 -0500, Serguei Sagalovitch wrote:
> On 2016-11-27 09:02 AM, Haggai Eran wrote
> >
> > On PeerDirect, we have some kind of a middle-ground solution for
> > pinning
> > GPU memory. We create a non-ODP MR pointing to VRAM but rely on
On 11/25/2016 9:32 PM, Jason Gunthorpe wrote:
> On Fri, Nov 25, 2016 at 02:22:17PM +0100, Christian König wrote:
>
>>> Like you say below we have to handle short lived in the usual way, and
>>> that covers basically every device except IB MRs, including the
>>> command queue on a NVMe drive.
>>
On 11/25/2016 9:32 PM, Jason Gunthorpe wrote:
> On Fri, Nov 25, 2016 at 02:22:17PM +0100, Christian König wrote:
>
>>> Like you say below we have to handle short lived in the usual way, and
>>> that covers basically every device except IB MRs, including the
>>> command queue on a NVMe drive.
>>
>>
