tree 49b54ea585dcd657083c8b755726820b002ae75a
parent 8cab7ccccbdd9fe3cf6b3400d5a88ecb683a5b1b
author Christoph Lameter <clameter@sgi.com> 1143615278 -0800
committer Tony Luck <tony.luck@intel.com> 1144476496 -0700

[IA64] Prefetch mmap_sem in ia64_do_page_fault()

Take a hint from an x86_64 optimization by Arjan van de Ven and use it
for ia64.  See a9ba9a3b3897561d01e04cd21433746df46548c0

Prefetch the mmap_sem, which is critical for the performance of the page fault
handler.

Note: mm may be NULL but I guess that is safe.
See 458f935527372499b714bf4f8e646a68bb0f52e3

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>