This is a patchset implementing MMU notifier callbacks based on Andrea's earlier work. These are needed if Linux pages are referenced from something else than tracked by the rmaps of the kernel.
Issues: - Feedback from uses of the callbacks for KVM, RDMA, XPmem and GRU - RCU quiescent periods are required on registering and unregistering notifiers to guarantee visibility to other processors. Currently only mmu_notifier_release() does the correct thing. It is up to the user to provide RCU quiescent periods for register/unregister functions if they are called outside of the ->release method. Andrea's mmu_notifier #4 -> RFC V1 - Merge subsystem rmap based with Linux rmap based approach - Move Linux rmap based notifiers out of macro - Try to account for what locks are held while the notifiers are called. - Develop a patch sequence that separates out the different types of hooks so that we can review their use. - Avoid adding include to linux/mm_types.h - Integrate RCU logic suggested by Peter. V1->V2: - Improve RCU support - Use mmap_sem for mmu_notifier register / unregister - Drop invalidate_page from COW, mm/fremap.c and mm/rmap.c since we already have invalidate_range() callbacks there. - Clean compile for !MMU_NOTIFIER - Isolate filemap_xip strangeness into its own diff - Pass a the flag to invalidate_range to indicate if a spinlock is held. - Add invalidate_all() -- -- 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/
