[Xen-devel] [PATCH v5 0/8] xen: arm: Use super pages in p2m

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

The following series adds support for superpage mappings (1G and 2M) in
the p2m for dom0 and domU.

On a 32-bit platform this causes the overhead of kernbench vs. native to
drop from 8-9% to 1.5-3% (it's basically the same for both dom0 and
domU).

I couldn't get my 64-bit platform to boot natively for some reason but
in absolute terms kernbench improved by ~5% (domU) to ~15% (dom0).

A   xen: arm: dump vcpu gic info in arch_dump_vcpu_info
At  tools/libxc: pull min/max_t into xc_private.h
At  tools: arm: allocate large pages to guests.
A   xen: arm: only put_page for p2m operations which require it.
A   xen: arm: handle superpage mappings in p2m_lookup
A m xen: arm: add some helpers for assessing p2m pte
  m xen: arm: use superpages in p2m when pages are suitably aligned
    xen: arm: allocate more than one bank for 1:1 domain 0 if needed

A == ARM ack
t == Tools ACK still needed
m == modifications this round

Ian.

The following changes since commit f9cff088f470b662df1ac31d1161b4f1870b8546:

  oxenstored: perform a 3-way merge of the quota after a transaction 
(2014-07-04 09:49:09 +0100)

are available in the git repository at:

  git://xenbits.xen.org/people/ianc/xen.git arm-p2m-superpages-v5

for you to fetch changes up to 4f8e06b5a901e58cb095878ced7989ac65dd7f3d:

  xen: arm: allocate more than one bank for 1:1 domain 0 if needed (2014-07-09 
13:02:47 +0100)

----------------------------------------------------------------
Ian Campbell (8):
      xen: arm: dump vcpu gic info in arch_dump_vcpu_info
      tools/libxc: pull min/max_t into xc_private.h
      tools: arm: allocate large pages to guests.
      xen: arm: only put_page for p2m operations which require it.
      xen: arm: handle superpage mappings in p2m_lookup
      xen: arm: add some helpers for assessing p2m pte
      xen: arm: use superpages in p2m when pages are suitably aligned
      xen: arm: allocate more than one bank for 1:1 domain 0 if needed

 tools/libxc/xc_dom_arm.c                  |  131 ++++++-
 tools/libxc/xc_dom_decompress_unsafe_xz.c |    5 -
 tools/libxc/xc_private.h                  |    5 +
 xen/arch/arm/domain.c                     |    8 +-
 xen/arch/arm/domain_build.c               |  288 +++++++++++++--
 xen/arch/arm/p2m.c                        |  554 ++++++++++++++++++++++-------
 xen/include/asm-arm/p2m.h                 |   12 +
 7 files changed, 822 insertions(+), 181 deletions(-)



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