[Xen-devel] [PATCH 0 of 4] [RFC] x86 shadow: get rid of the need for contiguous memory

[Tim Deegan <Tim.Deegan@xxxxxxxxxx>]

This series of patches removes the need for shadow pagetable memory to
be allocated in 4-page contiguous blocks, by reusing the page_info 
list header for yet one more thing. 

It fixes a long-standing issue where on a fairly full machine which has
seen a lot of ballooning HVM domain creation can fail because the 
remaining memory is too fragmented to use for shadows.

Posting as an RFC for now because I haven't had a chance to do any
heavy testing (compile tests under 32-bit WinXP seem fine though) 
and I'm away for the next week.  I hope to fold in any feedback 
and commit this change the week after that.

Cheers,

Tim.

5 files changed, 332 insertions(+), 301 deletions(-)
xen/arch/x86/mm/shadow/common.c  |  345 +++++++++++++-------------------------
xen/arch/x86/mm/shadow/multi.c   |  143 +++++++++------
xen/arch/x86/mm/shadow/private.h |  117 +++++++++++-
xen/include/asm-x86/domain.h     |    3 
xen/include/asm-x86/mm.h         |   25 +-

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