Something like madvise(MADV_FREE) sounds closer than MADV_DONTNEED -- the app can check for zero where it wrote nonzero -- but doesn't guarantee the freeing wil

Something like madvise(MADV_FREE) sounds closer than MADV_DONTNEED -- the app can check for zero where it wrote nonzero -- but doesn't guarantee the freeing will be delayed until there is memory pressure.