[Qemu-devel] [PATCH qemu v5 00/18] memory: Store physical root MR in FlatView

[Alexey Kardashevskiy]

This was inspired by https://bugzilla.redhat.com/show_bug.cgi?id=1481593
Previous versions:
v1: https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg01559.html
v2: https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg04069.html
v3: https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg04523.html
v4: https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg05669.html

This patchset tries to reduce amount of memory used by FlatViews
and tries share as many FVs between address spaces as possible.

Changelog:
v5:
* removed "memory: Give memory_region_transaction_commit a hint" (broken)
* added "memory: Avoid temporary FlatView allocation in a single child case"
but I suggest ditching it, it is just there to demonsrate how I checked
the suggested idea
* updated example of "info mtree -f -d" in 14/18 to demonstrate the result

v4:
* total rework again to provide grounds for new 15/18, 17/18, 18/18

v3:
* addressed comments from v2, mainly simplified the code

v2:
* total rework


This is based on sha1
c51700273a Peter Maydell "Merge remote-tracking branch 
'remotes/cohuck/tags/s390x-20170919-v2' into staging".

Please comment. Thanks.



Alexey Kardashevskiy (18):
  exec: Explicitly export target AS from
    address_space_translate_internal
  memory: Open code FlatView rendering
  memory: Move FlatView allocation to a helper
  memory: Move AddressSpaceDispatch from AddressSpace to FlatView
  memory: Remove AddressSpace pointer from AddressSpaceDispatch
  memory: Switch memory from using AddressSpace to FlatView
  memory: Cleanup after switching to FlatView
  memory: Rename mem_begin/mem_commit/mem_add helpers
  memory: Store physical root MR in FlatView
  memory: Alloc dispatch tree where topology is generared
  memory: Move address_space_update_ioeventfds
  memory: Share FlatView's and dispatch trees between address spaces
  memory: Do not allocate FlatView in address_space_init
  memory: Rework "info mtree" to print flat views and dispatch trees
  memory: Share special empty FlatView
  memory: Get rid of address_space_init_shareable
  memory: Create FlatView directly
  memory: Avoid temporary FlatView allocation in a single child case

 include/exec/memory-internal.h |  16 +-
 include/exec/memory.h          |  76 +++++-----
 include/hw/arm/armv7m.h        |   2 +-
 cpus.c                         |   5 +-
 exec.c                         | 330 ++++++++++++++++++++++++----------------
 hw/arm/armv7m.c                |   9 +-
 hw/intc/openpic_kvm.c          |   2 +-
 memory.c                       | 335 +++++++++++++++++++++++++++++++----------
 monitor.c                      |   3 +-
 target/arm/cpu.c               |  16 +-
 target/i386/cpu.c              |   5 +-
 hmp-commands-info.hx           |   7 +-
 12 files changed, 533 insertions(+), 273 deletions(-)

-- 
2.11.0