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[IA64] Prefetch mmap_sem in ia64_do_page_fault()

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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>
This commit is contained in:
Christoph Lameter 2006-03-28 22:54:38 -08:00 committed by Tony Luck
parent 8cab7ccccb
commit 0ffe984917
1 changed files with 3 additions and 0 deletions
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3
arch/ia64/mm/fault.c
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@ -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..
*/