Anthony Liguori wrote: >> I don't think we can do page migration with VT-d. You need to be able >> to detect whether the page has been changed by dma after you've copied >> it but before you changed the pte, but VT-d doesn't allow that AFAICT. >> > > Hrm, I would have to look at the VT-d but I suspect you're right. > That's unfortunate. > > That means mlock() isn't sufficient. It also means that the VMAs can't > be updated while the guest is running. Is there any way to lock a vma > region such that things like madvise/mmap(MAP_FIXED) will always fail? >
Userspace can simply not issue them. Page migration is also controlled by userspace. Once active memory defragmentation goes in, we need a way to tell the kernel that the allocation is unreclaimable, perhaps with a new mmap flag. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
