On Fri, 08 Feb 2008 14:06:16 -0800 Christoph Lameter <[EMAIL PROTECTED]> wrote:
> 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 (an external MMU). MMU > notifiers allow us to get rid of the page pinning for RDMA and various > other purposes. It gets rid of the broken use of mlock for page pinning. > (mlock really does *not* pin pages....) > > More information on the rationale and the technical details can be found in > the first patch and the README provided by that patch in > Documentation/mmu_notifiers. > > The known immediate users are > > KVM > - Establishes a refcount to the page via get_user_pages(). > - External references are called spte. > - Has page tables to track pages whose refcount was elevated but > no reverse maps. > > GRU > - Simple additional hardware TLB (possibly covering multiple instances of > Linux) > - Needs TLB shootdown when the VM unmaps pages. > - Determines page address via follow_page (from interrupt context) but can > fall back to get_user_pages(). > - No page reference possible since no page status is kept.. > > XPmem > - Allows use of a processes memory by remote instances of Linux. > - Provides its own reverse mappings to track remote pte. > - Established refcounts on the exported pages. > - Must sleep in order to wait for remote acks of ptes that are being > cleared. > What about ib_umem_get()? ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
