message: meshable_arena: on scavenge just madvise, don't also need fallocate
diff: @@ -311,7 +311,7 @@ void MeshableArena::partialScavenge() {
  auto ptr = ptrFromOffset(span.offset);
  auto sz = span.byteLength();
  madvise(ptr, sz, MADV_DONTNEED);
  - freePhys(ptr, sz);
  + // freePhys(ptr, sz);
  // don't coalesce, just add to clean
  _clean[span.spanClass()].push_back(span);
  });
  @@ -365,7 +365,7 @@ void MeshableArena::scavenge(bool force) {
  auto ptr = ptrFromOffset(span.offset);
  auto sz = span.byteLength();
  madvise(ptr, sz, MADV_DONTNEED);
  - freePhys(ptr, sz);
  + // freePhys(ptr, sz);
  markPages(span);
  });
  