On Wed, 4 Oct 2017, Anshuman Khandual wrote: > > - Using 'pre-allocated' pages in the fault paths may be intrusive. > > But we have already faulted in all of them for the mapping and they > are also locked. Hence there should not be any page faults any more > for the VMA. Am I missing something here ?
The PTEs may be torn down and have to reestablished through a page faults. Page faults would not allocate memory. > I am still wondering why wait till fault time not pre fault all of them > and populate the page tables. They are populated but some processes (swap and migration) may tear them down.
