On Fri, Oct 02, 2026 at 03:11:27PM +0200, David Hildenbrand (Arm) wrote:
> I'd be very happy if we could find a clear way to describe "this is what we
> call
> user memory: anon+pagecache", if that could come handy in such a context.
Rather than arguing about it, how about shifting things to 'what backs the
mapping' and something like:
/* big long kdoc... */
static inline bool vma_flags_is_mm_backed(const vma_flags_t *flags)
{
/* hugetlb is a fixed mapping, but the mm owns it entirely. */
if (vma_flags_is_hugetlb(flags))
return true;
/*
* Kernel-owned mappings are populated by their owner, and fixed
mappings
* have a layout the mm cannot assume ordinary fault semantics over.
*/
if (vma_flags_is_kernel_owned(flags) ||
vma_flags_is_fixed_mapping(flags))
return false;
/* The mm has promised it may discard droppable memory at any time. */
return !vma_flags_test_single_mask(flags, VMA_DROPPABLE);
}
?
--
Cheers, Lorenzo
