perf MADV_FREE

 44.43%  ebizzy  ebizzy             [.] memcpy                                                               
 30.67%  ebizzy  [kernel.kallsyms]  [k] default_send_IPI_mask_allbutself_phys                              a
 12.52%  ebizzy  [kernel.kallsyms]  [k] _raw_spin_unlock_irqrestore                                        a
  6.11%  ebizzy  [kernel.kallsyms]  [k] smp_call_function_many                                             a
  0.87%  ebizzy  [kernel.kallsyms]  [k] __do_softirq                                                       a
  0.57%  ebizzy  [kernel.kallsyms]  [k] lazyfree_range                                                     a
  0.52%  ebizzy  [kernel.kallsyms]  [k] deactivate_page                                                    a
  0.45%  ebizzy  ebizzy             [.] write_pattern                                                      a
  0.36%  ebizzy  [kernel.kallsyms]  [k] release_pages                                                      a
  0.28%  ebizzy  [kernel.kallsyms]  [k] default_send_IPI_mask_sequence_phys                                a

perf vanilla

 21.38%  ebizzy  [kernel.kallsyms]  [k] default_send_IPI_mask_allbutself_phys
 17.77%  ebizzy  ebizzy             [.] memcpy
 16.18%  ebizzy  [kernel.kallsyms]  [k] _raw_spin_unlock_irqrestore
  7.86%  ebizzy  [kernel.kallsyms]  [k] clear_page
  6.45%  ebizzy  [kernel.kallsyms]  [k] __do_page_fault
  4.37%  ebizzy  [kernel.kallsyms]  [k] smp_call_function_many
  3.27%  ebizzy  [kernel.kallsyms]  [k] get_page_from_freelist
  2.29%  ebizzy  [kernel.kallsyms]  [k] handle_mm_fault
  1.75%  ebizzy  [kernel.kallsyms]  [k] find_vma
  1.37%  ebizzy  [kernel.kallsyms]  [k] down_read_trylock
  1.22%  ebizzy  [kernel.kallsyms]  [k] __mem_cgroup_try_charge
  1.15%  ebizzy  [kernel.kallsyms]  [k] __mem_cgroup_commit_charge
  1.15%  ebizzy  [kernel.kallsyms]  [k] up_read
  1.13%  ebizzy  [kernel.kallsyms]  [k] __mem_cgroup_uncharge_common
  0.87%  ebizzy  [kernel.kallsyms]  [k] __mem_cgroup_count_vm_event
  0.75%  ebizzy  [kernel.kallsyms]  [k] unmap_single_vma
  0.74%  ebizzy  [kernel.kallsyms]  [k] __alloc_pages_nodemask
  0.72%  ebizzy  [kernel.kallsyms]  [k] page_add_new_anon_rmap
  0.64%  ebizzy  [kernel.kallsyms]  [k] free_hot_cold_page
  0.50%  ebizzy  [kernel.kallsyms]  [k] get_pageblock_flags_group
  0.48%  ebizzy  ebizzy             [.] write_pattern

perf VMA-based

 85.17%  ebizzy  ebizzy             [.] memcpy
  5.93%  ebizzy  [kernel.kallsyms]  [k] _raw_spin_unlock_irqrestore
  1.26%  ebizzy  ebizzy             [.] write_pattern
  1.03%  ebizzy  [kernel.kallsyms]  [k] finish_task_switch
  0.66%  ebizzy  [kernel.kallsyms]  [k] rwsem_down_write_failed
  0.39%  ebizzy  [kernel.kallsyms]  [k] vma_adjust
  0.38%  ebizzy  [kernel.kallsyms]  [k] clear_page
  0.34%  ebizzy  [kernel.kallsyms]  [k] find_vma
  0.31%  ebizzy  ebizzy             [.] _int_malloc