1) set "current->swappable" to 0
2) ensure that the desired pages are in physical memory with
a per-page call to "(void)get_user(vadr)"
3) perform a quick, no error checking, virtual-to-physical
translation:
padr = pte_page(
*pte_offset(
pmd_offset(
pgd_offset(current->mm, vadr),
vadr),
vadr));
4) provide the physical address(es) to the device
5) upon completion of the I/O, set "current->swappable" to 1
While this should work (comments?), preventing the swapping of ALL of
the current process pages seems overkill, when only a few are required.
Thus, my question: Is there a way to prevent swapping on a
page-by-page basis?
-- Chuck Goodhart <Charles.E.Goodhart@jpl.nasa.gov>