Comment 4 for bug 1808412

When the memory allocation was stalled, here is what perf top was giving me:
Samples: 483K of event 'cycles:ppp', Event count (approx.): 52114089074
Overhead Shared Object Symbol
  28.53% [kernel] [k] total_mapcount
  25.34% [kernel] [k] kvm_age_rmapp
  13.54% [kernel] [k] slot_rmap_walk_next
  11.24% [kernel] [k] kvm_handle_hva_range
   6.35% [kernel] [k] rmap_get_first
   3.69% [kernel] [k] __x86_indirect_thunk_r13
   1.33% [kernel] [k] __isolate_lru_page
   0.63% [kernel] [k] isolate_lru_pages.isra.58
   0.48% [kernel] [k] page_vma_mapped_walk
   0.40% [kernel] [k] __mod_node_page_state
   0.35% [kernel] [k] clear_page_erms
   0.31% [kernel] [k] shrink_page_list
   0.28% [kernel] [k] _find_next_bit
   0.27% [kernel] [k] putback_inactive_pages
   0.27% [kernel] [k] move_active_pages_to_lru
   0.27% [kernel] [k] inactive_list_is_low
   0.22% [kernel] [k] __mod_zone_page_state

numactl -H when the memorry allocation stalled:
root@gpu-compute028:~# numactl -H
available: 2 nodes (0-1)
node 0 cpus: 0 2 4 6 8 10 12 14
node 0 size: 64288 MB
node 0 free: 55983 MB
node 1 cpus: 1 3 5 7 9 11 13 15
node 1 size: 64489 MB
node 1 free: 63810 MB
node distances:
node 0 1
  0: 10 21
  1: 21 10
root@gpu-compute028:~# numactl -H
available: 2 nodes (0-1)
node 0 cpus: 0 2 4 6 8 10 12 14
node 0 size: 64288 MB
node 0 free: 366 MB
node 1 cpus: 1 3 5 7 9 11 13 15
node 1 size: 64489 MB
node 1 free: 63782 MB
node distances:
node 0 1
  0: 10 21
  1: 21 10
root@gpu-compute028:~# numactl -H
available: 2 nodes (0-1)
node 0 cpus: 0 2 4 6 8 10 12 14
node 0 size: 64288 MB
node 0 free: 368 MB
node 1 cpus: 1 3 5 7 9 11 13 15
node 1 size: 64489 MB
node 1 free: 63757 MB
node distances:
node 0 1
  0: 10 21
  1: 21 10
root@gpu-compute028:~# numactl -H
available: 2 nodes (0-1)
node 0 cpus: 0 2 4 6 8 10 12 14
node 0 size: 64288 MB
node 0 free: 368 MB
node 1 cpus: 1 3 5 7 9 11 13 15
node 1 size: 64489 MB
node 1 free: 63744 MB
node distances:
node 0 1
  0: 10 21
  1: 21 10
root@gpu-compute028:~# numactl -H
available: 2 nodes (0-1)
node 0 cpus: 0 2 4 6 8 10 12 14
node 0 size: 64288 MB
node 0 free: 366 MB
node 1 cpus: 1 3 5 7 9 11 13 15
node 1 size: 64489 MB
node 1 free: 63504 MB
node distances:
node 0 1
  0: 10 21
  1: 21 10

then i killed the process.