Commit 0ffe9849 authored Mar 28, 2006 by Christoph Lameter Committed by Tony Luck Apr 07, 2006

[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 a9ba9a3b

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 458f9355

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

parent 8cab7ccc

arch/ia64/mm/fault.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -60,6 +60,9 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
		struct siginfo si;
		unsigned long mask;

		/* mmap_sem is performance critical.... */
		prefetchw(&mm->mmap_sem);

		/*
		* If we're in an interrupt or have no user context, we must not take the fault..
		*/