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

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

ooohh!!  thank you thank you

/me wonders how many other order>0 allocations are left now
that will break a running or newly-launching domain when the
allocation fails due to fragmentation, and if it will be easy
to track them down and shoot them

> -----Original Message-----
> From: Tim Deegan [mailto:Tim.Deegan@xxxxxxxxxx]
> Sent: Friday, August 20, 2010 9:58 AM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] [PATCH 0 of 4] [RFC] x86 shadow: get rid of the
> need for contiguous memory
> 
> 
> 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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