e.g. it is

	.. on_pagefault_start   0.954 µs
	.. vma_on_pagefault_pre 0.954 µs
	.. ramh_alloc_page_pre  0.954 µs
	.. ramh_alloc_page      169.992 µs
	.. vma_on_pagefault     172.853 µs
	.. vma_on_pagefault_pre 172.853 µs
	.. vma_on_pagefault     174.046 µs
	.. on_pagefault_end     174.046 µs
	.. whole:               171.900 µs

so almost all in ramh_alloc_page.