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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 0 of 3] Update paging/sharing/access interfaces v2
i(Was switch from domctl to memops) Changes from v1 posted Feb 2nd 2012 - Patches 1 & 2 Acked-by Tim Deegan on the hypervisor side - Added patch 3 to clean up the enable domctl interface, based on discussion with Ian Campbell Description from original post follows: Per page operations in the paging, sharing, and access tracking subsystems are all implemented with domctls (e.g. a domctl to evict one page, or to share one page). Under heavy load, the domctl path reveals a lack of scalability. The domctl lock serializes dom0's vcpus in the hypervisor. When performing thousands of per-page operations on dozens of domains, these vcpus will spin in the hypervisor. Beyond the aggressive locking, an added inefficiency of blocking vcpus in the domctl lock is that dom0 is prevented from re-scheduling any of its other work-starved processes. We retain the domctl interface for setting up and tearing down paging/sharing/mem access for a domain. But we migrate all the per page operations to use the memory_op hypercalls (e.g XENMEM_*). This is a backwards-incompatible ABI change. It's been floating on the list for a couple weeks now, with no nacks thus far. Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla> Signed-off-by: Adin Scannell <adin@xxxxxxxxxxx> tools/libxc/xc_mem_access.c | 12 +- tools/libxc/xc_mem_event.c | 23 +++- tools/libxc/xc_mem_paging.c | 44 ++++---- tools/libxc/xc_memshr.c | 182 ++++++++++++++++------------------ tools/libxc/xenctrl.h | 6 +- tools/memshr/interface.c | 4 +- tools/tests/mem-sharing/memshrtool.c | 4 +- xen/arch/x86/domctl.c | 1 - xen/arch/x86/mm/mem_access.c | 7 +- xen/arch/x86/mm/mem_event.c | 68 ++++++++++-- xen/arch/x86/mm/mem_paging.c | 13 +- xen/arch/x86/mm/mem_sharing.c | 99 +++++++++++------- xen/arch/x86/x86_64/compat/mm.c | 23 ++++ xen/arch/x86/x86_64/mm.c | 23 ++++ xen/include/asm-x86/mem_access.h | 3 +- xen/include/asm-x86/mem_event.h | 2 + xen/include/asm-x86/mem_paging.h | 3 +- xen/include/asm-x86/mem_sharing.h | 3 + xen/include/public/domctl.h | 90 +++------------- xen/include/public/memory.h | 87 ++++++++++++++++ tools/libxc/xc_memshr.c | 11 ++ tools/libxc/xenctrl.h | 1 + tools/tests/mem-sharing/memshrtool.c | 11 ++ xen/arch/x86/mm/mem_sharing.c | 13 +- xen/arch/x86/x86_64/compat/mm.c | 3 + xen/arch/x86/x86_64/mm.c | 2 + xen/include/asm-x86/mem_sharing.h | 3 +- xen/include/public/memory.h | 3 +- tools/libxc/xc_mem_access.c | 10 +- tools/libxc/xc_mem_event.c | 16 ++- tools/libxc/xc_mem_paging.c | 10 +- tools/libxc/xenctrl.h | 7 +- tools/tests/xen-access/xen-access.c | 56 +--------- tools/xenpaging/xenpaging.c | 33 +---- tools/xenpaging/xenpaging.h | 2 +- xen/arch/x86/mm/mem_event.c | 33 +----- xen/include/public/domctl.h | 4 +- xen/include/public/mem_event.h | 4 - xen/include/xen/sched.h | 2 - 39 files changed, 514 insertions(+), 407 deletions(-) _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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