54.05%  [kernel]                                 [k] _raw_spin_lock_irqsave
   7.65%  libc-2.17.so                             [.] __memcpy_ssse3_back
   3.73%  [kernel]                                 [k] clear_page_c_e
   2.47%  [kernel]                                 [.] irq_return
   1.55%  [kernel]                                 [k] get_page_from_freelist
   1.46%  [kernel]                                 [k] handle_mm_fault
   1.06%  [kernel]                                 [k] release_pages
   1.06%  [kernel]                                 [k] __mem_cgroup_uncharge_common
   1.02%  [kernel]                                 [k] __mem_cgroup_commit_charge
   0.91%  [kernel]                                 [k] mem_cgroup_charge_common
   0.76%  [kernel]                                 [k] mem_cgroup_page_lruvec
   0.74%  ceph-osd                                 [.] ceph::buffer::ptr::copy_out
   0.72%  [kernel]                                 [k] __alloc_pages_nodemask
   0.71%  [kernel]                                 [k] __mem_cgroup_try_charge
   0.68%  [kernel]                                 [k] __pagevec_lru_add_fn
   0.63%  [kernel]                                 [k] __list_add
   0.62%  [kernel]                                 [k] __do_page_fault
   0.55%  ceph-osd                                 [.] ceph::buffer::list::iterator_impl<false>::copy
   0.52%  [kernel]                                 [k] lookup_page_cgroup
   0.49%  [kernel]                                 [k] __list_del_entry
   0.48%  [kernel]                                 [k] free_hot_cold_page
   0.44%  [kernel]                                 [k] page_add_new_anon_rmap
   0.42%  [kernel]                                 [k] free_pages_prepare
   0.37%  [kernel]                                 [k] get_pageblock_flags_group