[Xen-devel] [PATCH 0 of 2] x86/mm: Switch paging/sharing/access per-page ops to memops

[Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>]

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_*).

A new tools-only section is added to the public memory.h header.

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          |    1 +
 28 files changed, 458 insertions(+), 284 deletions(-)

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