Re: objrmap and vmtruncate

[Andrew Morton]

Andrea Arcangeli <[e-mail]> wrote:
>
> Esepcially those sigbus in the current api
> would be more expensive than the regular paging internal to the VM and
> besides the signal it would generate flood of syscalls and kind of
> duplication of memory management inside the userspace.

That went away.  We now encode the file offset in the unmapped ptes, so the
kernel's fault handler can transparently reestablish the page.