Take a hint from an x86_64 optimization by Arjan van de Ven and use it for ia64. See http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a9ba9a3b3897561d01e04cd21433746df46548c0 Prefetch the mmap_sem, which is critical for the performance of the page fault handler. Maybe we can offset the damage done by the kprobes notifier? Note: mm may be NULL but I guess that is safe. See http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=458f935527372499b714bf4f8e646a68bb0f52e3 Signed-off-by: Christoph Lameter <clameter@xxxxxxx> Index: linux-2.6.16/arch/ia64/mm/fault.c =================================================================== --- linux-2.6.16.orig/arch/ia64/mm/fault.c 2006-03-19 21:53:29.000000000 -0800 +++ linux-2.6.16/arch/ia64/mm/fault.c 2006-03-28 22:44:01.000000000 -0800 @@ -60,6 +60,9 @@ ia64_do_page_fault (unsigned long addres 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.. */ - : send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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