IRC, freenode, #hurd, 2013-04-02  <psockali> hi again, maybe
someone has some metrics  <psockali> is mprotect / munprotect
faster in hurd then in linux ? <pinotree> ? <psockali> can i
protected a memory page against write access in hurd  <psockali>
and if so, is it a fast operation ? <youpi> you can, I never
measured, but it's probably the same cost as in <youpi> I don't
see why it would be different, as it boils down to the same
x86 trick <psockali> but i suppose it is part of the mach kernel
doing the protection   and not part of the unix layer ? <youpi>
it is <youpi> the unix layer doesn't have mm control <youpi> it
has to ask the kernel <braunr> it's slower on mach, as it's less
optimized because of historical <braunr> but that's about it
<youpi> less optimized, how so? <braunr> well, more entry
fragmentation <youpi> in the end you mark the page table and
flush the tlb <braunr> yes <braunr> the high level virtual
memory layer is a bit slower <youpi> but fragmentation doesn't
come into play it you just h