Re: [PATCH V4 5/6] mm: mmap: Add mmap flag to request VM_LOCKONFAULT

Kirill A. Shutemov
2015-07-22T11:26:07Z

On Tue, Jul 21, 2015 at 03:59:40PM -0400, Eric B Munson wrote:
> The cost of faulting in all memory to be locked can be very high when
> working with large mappings. If only portions of the mapping will be
> used this can incur a high penalty for locking.
>
> Now that we have the new VMA flag for the locked but not present state,
> expose it as an mmap option like MAP_LOCKED -> VM_LOCKED.

What is advantage over mmap() + mlock(MLOCK_ONFAULT)?

--
Kirill A. Shutemov