From: FUJITA Tomonori <[EMAIL PROTECTED]> Date: Thu, 07 Feb 2008 08:53:33 +0900
> On Wed, 06 Feb 2008 15:18:55 -0800 (PST) > David Miller <[EMAIL PROTECTED]> wrote: > > > I intend to put merging back in, perhaps something similar to > > powerpc's merging logic but without the expensive (in my opinion) > > IOMMU allocation every loop. I think it is better to determine the > > segment breaks in one pass, allocate that many IOMMU entries in one > > allocation, then fill them all in. > > I thought about asking you if I can modify the SPARC IOMMUs to do > allocation in every loop. > > The reason why I need the allocation in every loop is that I also need > to fix the problem that IOMMUs allocate memory areas without > considering a low level driver's segment boundary limits. > > http://linux.derkeiler.com/Mailing-Lists/Kernel/2007-11/msg07616.html > http://linux.derkeiler.com/Mailing-Lists/Kernel/2007-12/msg02286.html > > As far as I know, all the IOMMUs except for SPARC allocate a free area > in every loop but if it's too expensive for SPARC, then we need to > find a different way to handle segment boundary limits. Ok then what I'll do is adopt some version of powerpc's merging allocator into the sparc64 code. -- 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/
