Re: [PATCH v3 01/12] drm: Add dummy page per device or GEM object

Typo Correction bellow

On 1/7/21 11:26 AM, Andrey Grodzovsky wrote:

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Or is the idea to save the struct page * pointer? That feels a bit like over-optimizing stuff. Better to have a simple implementation first and then tune it if (and only if) any part of it becomes a problem for normal usage.

Exactly - the idea is to avoid adding extra pointer to drm_gem_object, Christian suggested to instead keep a linked list of dummy pages to be allocated on demand once we hit a vm_fault. I will then also prefault the entire VA range from vma->vm_end - vma->vm_start to vma->vm_end and map them to that single dummy page.

Obviously the range is from  vma->vm_start to vma->vm_end

Andrey

Andrey