On May 18, 2005, at 9:14 AM, Dan Malek wrote: > > > On May 18, 2005, at 6:21 AM, Eugene Surovegin wrote: > > > This patch fixed CONFIG_TASK_SIZE handling on 44x. > > Paul suggested to me and I've been contemplating changing > the page table management on PowerPC to something similar > to other platforms.? At first, I was only going to do this on 8xx, > but I think I'll do it for PowerPC in general so all boards can > take advantage if they choose to do so. > > Other ports populate the user page tables with the kernel pmd > entries upon kernel faults, then we don't have to distinguish > among page tables during the TLB exceptions.? I'm hoping we > can populate the init page table entries at boot time, and then > everyone will inherit them, eliminating all faults unless the kernel > vmalloc space grows to need a new pmd entry.
I'm a bit concerned about this in the future. On Book-E parts we may end up actually utilizing the address space bit to provide a true 4G/4G split. I understand the current pain in doing this today. I just want you to be aware of what the future might bring. > This would be a generic solution to selecting task size, among > other advanced memory mapping options. > > I'll keep you posted. While we wait on this I think getting Eugene's patch is worth while. - kumar
