[PATCH v2 0/6] KVM: optimize memslots searching

[Xiao Guangrong]

This is the more work base on my v1 patchset which is posted some months ago,
it can be found at:
https://lkml.org/lkml/2011/2/22/68

Change log:
- sort memslots base on its size and do the line search instead of binary
  search base on gfn, it is from Avi's idea.
- in order to reduce cache footprint, memslots are sorted in the array of
  kvm->memslots->memslots[] and introduce a table to map slot id to index in
  the array

There is the performance result:

autotest for RHEL.6.1 setup/boot/reboot/shutdown(average):
ept=1:	before: 449.5	after: 447.8
ept=0:	before: 532.7	after: 529.8

kernbench(average):
ept=1:	before: 127.94	after: 126.98
ept=0:	before: 196.85	after: 189.66

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