On Mon, Nov 02, 2009 at 10:22:14AM +0100, Ingo Molnar wrote:
>
> * Gleb Natapov <[email protected]> wrote:
>
> > diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
> > index f4cee90..14707dc 100644
> > --- a/arch/x86/mm/fault.c
> > +++ b/arch/x86/mm/fault.c
> > @@ -952,6 +952,9 @@ do_page_fault(struct pt_regs *regs, unsigned long
> > error_code)
> > int write;
> > int fault;
> >
> > + if (arch_handle_page_fault(regs, error_code))
> > + return;
> > +
>
> This patch is not acceptable unless it's done cleaner. Currently we
> already have 3 callbacks in do_page_fault() (kmemcheck, mmiotrace,
> notifier), and this adds a fourth one. Please consolidate them into a
> single callback site, this is a hotpath on x86.
>
This call is patched out by paravirt patching mechanism so overhead should be
zero for non paravirt cases. What do you want to achieve by consolidate
them into single callback? I mean the code will still exist and will have to be
executed on every #PF. Is the goal to move them out of line?
> And please always Cc: the x86 maintainers to patches that touch x86
> code.
>
Will do.
--
Gleb.
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