FYI, we noticed the below changes on

commit 054954eb051f35e74b75a566a96fe756015352c8 ("xen: switch to linear virtual mapped sparse p2m list")

testbox/testcase/testparams: vm-kbuild-yocto-ia32/boot/1

0aad5689837c882d  054954eb051f35e74b75a566a9  
----------------  --------------------------  
         %stddev     %change         %stddev
             \          |                \  
   4161536 ±  0%     -49.7%    2093056 ±  0%  kernel-size.bss


                                    kernel-size.bss

  4.5e+06 *+-*--*--*-*--*--*--*--*--*--*--*-*--*--*--*----------------------+
          |                                             *..*..              |
          |                                                   *..*.*..*..*..*
    4e+06 ++                                                                |
          |                                                                 |
          |                                                                 |
  3.5e+06 ++                                                                |
          |                                                                 |
    3e+06 ++                                                                |
          |                                                                 |
          |                                                                 |
  2.5e+06 ++                                                                |
          |                                                                 |
          O  O  O  O O  O  O  O  O  O  O  O O  O  O  O  O  O  O  O O        |
    2e+06 ++----------------------------------------------------------------+


Thanks,
Huang, Ying


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