Re: Help tracking down libpth problem on ia64?

[David Mosberger <davidm@napali.hpl.hp.com>]

>>>>> On Thu, 15 Jan 2004 19:35:19 -0800, Richard Harke <rharke@earthlink.net> said:

  Richard> On Thursday 15 January 2004 05:06 pm, David Mosberger
  Richard> wrote:
  >> >>>>> On Thu, 15 Jan 2004 17:58:27 -0800, Richard Harke >>>>>
  >> <rharke@earthlink.net> said:

  Richard> Then if the user goes off the end of the stack, there is a
  Richard> page fault and the system has the possiblity to extend the
  Richard> stack. On the ia64, this hardly seems feasible.
  >>  Just initialize ar.bsp==sp.  The stacks will then grow
  >> "outwards".  You'll need two guard areas, but that's the extent
  >> of it.

  Richard> But then why was the current scheme chosen for linix-ia64?

ia64 linux doesn't enforce a particular policy.  You can do in
user-level whatever you like.  The main thread of a new process gets
setup such that the stacks grow towards each other because it fits
well with RLIMIT_STACK and because it allows the available stack space
to be shared between register backing store and memory stack.  It is
often the case that programs that are register backing store intensive
are less memory-stack intensive and vice versa.

	--david