On Tue 15-10-19 14:51:42, Anshuman Khandual wrote: > This adds tests which will validate architecture page table helpers and > other accessors in their compliance with expected generic MM semantics. > This will help various architectures in validating changes to existing > page table helpers or addition of new ones. > > Test page table and memory pages creating it's entries at various level are > all allocated from system memory with required size and alignments. But if > memory pages with required size and alignment could not be allocated, then > all depending individual tests are just skipped afterwards. This test gets > called right after init_mm_internals() required for alloc_contig_range() to > work correctly. > > This gets build and run when CONFIG_DEBUG_VM_PGTABLE is selected along with > CONFIG_VM_DEBUG. Architectures willing to subscribe this test also need to > select CONFIG_ARCH_HAS_DEBUG_VM_PGTABLE which for now is limited to x86 and > arm64. Going forward, other architectures too can enable this after fixing > build or runtime problems (if any) with their page table helpers. A highlevel description of tests and what they are testing for would be really appreciated. Who wants to run these tests and why/when? What kind of bugs would get detected? In short why do we really need/want this code in the tree? -- Michal Hocko SUSE Labs
