On Tue, 2008-01-22 at 12:34 -0800, Christoph Lameter wrote: > > - Notifiers are called *after* we tore down ptes. At that point pages > may already have been freed and reused. This means that there can > still be uses of the page by the user of mmu_ops after the OS has > dropped its mapping. IMHO the foreign entity needs to drop its > mappings first. That also ensures that the entities operated > upon continue to exist.
That's definitely an issue. Maybe having the foreign entity get a reference to the page and drop it when it unmaps would help ? > - anon_vma/inode and pte locks are held during callbacks. So how does that fix the problem of sleeping then ? Ben. -- 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/
