Hi Christian / Thomas,
Wanted to ask if you have explored or thought about adding support in
TTM such that a ttm_bo could have more than one underlying backing store
segment (that is, to have a tree of ttm_resources)?
We are considering to support such BOs for Intel Xe driver.
Some of the benefits:
* devices with page fault support can fault (and migrate) backing store
at finer granularity than the entire BO
* BOs can support having multiple backing store segments, which can be
in different memory domains/regions
* BO eviction could operate on smaller granularity than entire BO
Or is the thinking that workloads should use SVM/HMM instead of
GEM_CREATE if they want above benefits?
Is this something you are open to seeing an RFC series that starts
perhaps with just extending ttm_bo_validate() to see how this might
shape up?
-Brian
