On 2/28/22 2:37 AM, David Hildenbrand wrote:
On 24.02.22 22:23, Muhammad Usama Anjum wrote:This introduces three tests: 1) Sanity check soft dirty basic semantics: allocate area, clean, dirty, check if the SD bit flipped. 2) Check VMA reuse: validate the VM_SOFTDIRTY usage 3) Check soft-dirty on huge pages This was motivated by Will Deacon's fix commit 912efa17e512 ("mm: proc: Invalidate TLB after clearing soft-dirty page state"). I was tracking the same issue that he fixed, and this test would have caught it.A note that madv_populate.c already contains some SOFTDIRTY tests regarding MADV_POPULATE. Eventually we want to factor out softdirty/pagemap handling+checks for easier reuse.
Is this patch unnecessary then? thanks, -- Shuah
