On Thu, 10 Jan 2008 01:47:16 +0100 Andi Kleen <[EMAIL PROTECTED]> wrote:
> Arjan van de Ven <[EMAIL PROTECTED]> writes: > > > > I'm btw all in favor of making mmio tracing full fledged kernel > > infrastructure. This doesn't mean "notifier" imo; this means a real > > flag in the struct page, and then the page fault code can do > > > > if (page->flags & FLAG_MMIO_TRACED) > > mmio_trace(page, regs, whatever..); > > > > (probably surrounded by a CONFIG_ ifdef) > > THis is a TON lighter than a notifier chain, and actually what you > > want, you don't really want a notifier, you want a call back when a > > special kind of page is touched. > > That would assume that your mmio area has a struct page. In most PCs > the ones in the PCI hole don't > so you also call the function for all traps on pages without struct page; that should be extremely rare anyway, and the mmio_trace code can then look the page up. -- If you want to reach me at my work email, use [EMAIL PROTECTED] For development, discussion and tips for power savings, visit http://www.lesswatts.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
