On Tue, Feb 19, 2019 at 12:40:37PM -0800, Dan Williams wrote:
On Tue, Feb 19, 2019 at 12:30 PM Jerome Glisse jglisse@redhat.com wrote:
On Tue, Feb 19, 2019 at 12:15:55PM -0800, Dan Williams wrote:
On Tue, Feb 19, 2019 at 12:04 PM jglisse@redhat.com wrote:
From: Jérôme Glisse jglisse@redhat.com
Since last version [4] i added the extra bits needed for the change_pte optimization (which is a KSM thing). Here i am not posting users of this, they will be posted to the appropriate sub-systems (KVM, GPU, RDMA, ...) once this serie get upstream. If you want to look at users of this see [5] [6]. If this gets in 5.1 then i will be submitting those users for 5.2 (including KVM if KVM folks feel comfortable with it).
The users look small and straightforward. Why not await acks and reviewed-by's for the users like a typical upstream submission and merge them together? Is all of the functionality of this infrastructure consumed by the proposed users? Last time I checked it was only a subset.
Yes pretty much all is use, the unuse case is SOFT_DIRTY and CLEAR vs UNMAP. Both of which i intend to use. The RDMA folks already ack the patches IIRC, so did radeon and amdgpu. I believe the i915 folks were ok with it too. I do not want to merge things through Andrew for all of this we discussed that in the past, merge mm bits through Andrew in one release and bits that use things in the next release.
Ok, I was trying to find the links to the acks on the mailing list, those references would address my concerns. I see no reason to rush SOFT_DIRTY and CLEAR ahead of the upstream user.
I intend to post user for those in next couple weeks for 5.2 HMM bits. So user for this (CLEAR/UNMAP/SOFTDIRTY) will definitly materialize in time for 5.2.
ACKS AMD/RADEON https://lkml.org/lkml/2019/2/1/395 ACKS RDMA https://lkml.org/lkml/2018/12/6/1473
For KVM Andrea Arcangeli seems to like the whole idea to restore the change_pte optimization but i have not got ACK from Radim or Paolo, however given the small performance improvement figure i get with it i do not see while they would not ACK.
https://lkml.org/lkml/2019/2/18/1530
Cheers, Jérôme