Re: Over-eager swapping

[Chris Webb]

Wu Fengguang <fengguang.wu@xxxxxxxxx> writes:

> Chris, can you post /proc/vmstat on the problem machines?

Here's /proc/vmstat from one of the bad machines with swap taken out:

  # cat /proc/vmstat
  nr_free_pages 115572
  nr_inactive_anon 562140
  nr_active_anon 5015609
  nr_inactive_file 997097
  nr_active_file 996989
  nr_unevictable 1368
  nr_mlock 1368
  nr_anon_pages 5862299
  nr_mapped 1414
  nr_file_pages 1994569
  nr_dirty 619
  nr_writeback 0
  nr_slab_reclaimable 88883
  nr_slab_unreclaimable 129859
  nr_page_table_pages 15744
  nr_kernel_stack 1132
  nr_unstable 0
  nr_bounce 0
  nr_vmscan_write 68708505
  nr_writeback_temp 0
  nr_isolated_anon 0
  nr_isolated_file 0
  nr_shmem 14
  numa_hit 15295188815
  numa_miss 9391232519
  numa_foreign 9391232519
  numa_interleave 16982
  numa_local 15294742520
  numa_other 9391678814
  pgpgin 20644565778
  pgpgout 28740368207
  pswpin 63818244
  pswpout 61199234
  pgalloc_dma 0
  pgalloc_dma32 4967135753
  pgalloc_normal 19812671901
  pgalloc_movable 0
  pgfree 24779926775
  pgactivate 1290396237
  pgdeactivate 1289759899
  pgfault 19993995783
  pgmajfault 21059190
  pgrefill_dma 0
  pgrefill_dma32 133366009
  pgrefill_normal 921184739
  pgrefill_movable 0
  pgsteal_dma 0
  pgsteal_dma32 1275354745
  pgsteal_normal 5641309780
  pgsteal_movable 0
  pgscan_kswapd_dma 0
  pgscan_kswapd_dma32 1333139288
  pgscan_kswapd_normal 5870516663
  pgscan_kswapd_movable 0
  pgscan_direct_dma 0
  pgscan_direct_dma32 1064518
  pgscan_direct_normal 13317302
  pgscan_direct_movable 0
  zone_reclaim_failed 0
  pginodesteal 0
  slabs_scanned 1682790400
  kswapd_steal 6902288285
  kswapd_inodesteal 4909342
  pageoutrun 65408579
  allocstall 33223
  pgrotated 68402979
  htlb_buddy_alloc_success 0
  htlb_buddy_alloc_fail 0
  unevictable_pgs_culled 3538872
  unevictable_pgs_scanned 0
  unevictable_pgs_rescued 4989403
  unevictable_pgs_mlocked 5192009
  unevictable_pgs_munlocked 4989074
  unevictable_pgs_cleared 2295
  unevictable_pgs_stranded 0
  unevictable_pgs_mlockfreed 0

The not-so-bad machine that's 3G in swap that I mentioned previously has

  # cat /proc/vmstat 
  nr_free_pages 898394
  nr_inactive_anon 834445
  nr_active_anon 4118034
  nr_inactive_file 904411
  nr_active_file 910902
  nr_unevictable 2440
  nr_mlock 2440
  nr_anon_pages 4836349
  nr_mapped 1553
  nr_file_pages 2243152
  nr_dirty 1097
  nr_writeback 0
  nr_slab_reclaimable 88788
  nr_slab_unreclaimable 127310
  nr_page_table_pages 14762
  nr_kernel_stack 532
  nr_unstable 0
  nr_bounce 0
  nr_vmscan_write 37404214
  nr_writeback_temp 0
  nr_isolated_anon 0
  nr_isolated_file 0
  nr_shmem 12
  numa_hit 14220178949
  numa_miss 3903552922
  numa_foreign 3903552922
  numa_interleave 16282
  numa_local 14219905325
  numa_other 3903826546
  pgpgin 6500403846
  pgpgout 13255814979
  pswpin 36384510
  pswpout 36380545
  pgalloc_dma 4
  pgalloc_dma32 2019546454
  pgalloc_normal 16466621455
  pgalloc_movable 0
  pgfree 18487068066
  pgactivate 530670561
  pgdeactivate 506674301
  pgfault 19986735100
  pgmajfault 10611234
  pgrefill_dma 0
  pgrefill_dma32 41306492
  pgrefill_normal 318767138
  pgrefill_movable 0
  pgsteal_dma 0
  pgsteal_dma32 214447663
  pgsteal_normal 1645250232
  pgsteal_movable 0
  pgscan_kswapd_dma 0
  pgscan_kswapd_dma32 218030201
  pgscan_kswapd_normal 1812499810
  pgscan_kswapd_movable 0
  pgscan_direct_dma 0
  pgscan_direct_dma32 157144
  pgscan_direct_normal 1095919
  pgscan_direct_movable 0
  zone_reclaim_failed 0
  pginodesteal 0
  slabs_scanned 50051072
  kswapd_steal 1858447127
  kswapd_inodesteal 202297
  pageoutrun 15070446
  allocstall 3104
  pgrotated 37181651
  htlb_buddy_alloc_success 0
  htlb_buddy_alloc_fail 0
  unevictable_pgs_culled 2113384
  unevictable_pgs_scanned 0
  unevictable_pgs_rescued 3055005
  unevictable_pgs_mlocked 3184675
  unevictable_pgs_munlocked 3045129
  unevictable_pgs_cleared 10034
  unevictable_pgs_stranded 0
  unevictable_pgs_mlockfreed 0

Best wishes,

Chris.
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