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Date: Mon, 22 Aug 2016 19:37:49 +0100
From: Andriy Tkachuk <andriy.tkachuk@...gate.com>
To: linux-kernel@...r.kernel.org
Cc: Mel Gorman <mgorman@...e.de>
Subject: Re: mm: kswapd struggles reclaiming the pages on 64GB server
The following patch resolved the problem:
--- linux-3.10.0-229.20.1.el7.x86_64.orig/mm/page_alloc.c
2015-09-24 15:47:25.000000000 +0000
+++ linux-3.10.0-229.20.1.el7.x86_64/mm/page_alloc.c 2016-08-15
09:49:46.922240569 +0000
@@ -5592,16 +5592,7 @@
*/
static void __meminit calculate_zone_inactive_ratio(struct zone *zone)
{
- unsigned int gb, ratio;
-
- /* Zone size in gigabytes */
- gb = zone->managed_pages >> (30 - PAGE_SHIFT);
- if (gb)
- ratio = int_sqrt(10 * gb);
- else
- ratio = 1;
-
- zone->inactive_ratio = ratio;
+ zone->inactive_ratio = 1;
}
static void __meminit setup_per_zone_inactive_ratio(void)
Now, kswapd works Ok:
# sar -rB -s 12:40:00
Linux 3.10.0-229.20.1.el7.mmir.x86_64
(castor-dev2-1-ssu-1-1.xy01.xyratex.com) 22/08/16 _x86_64_ (20 CPU)
12:40:01 pgpgin/s pgpgout/s fault/s majflt/s pgfree/s
pgscank/s pgscand/s pgsteal/s %vmeff
12:50:01 12.93 421699.50 1768.24 0.10 115379.86
59.40 0.16 58.61 98.40
13:00:01 15.12 1486930.99 3068.52 0.24 404668.48
145.59 10.86 123.66 79.04
13:10:01 2.93 1491112.20 3468.10 0.12 405929.73
131.39 2.27 132.57 99.18
13:20:01 1.54 1472652.82 3484.32 0.10 400732.43
142.20 0.85 139.14 97.26
13:30:01 3.96 1463064.37 3039.36 0.12 398160.98
147.01 2.37 143.24 95.89
13:40:01 4.10 1446720.90 3451.41 0.12 394217.53
148.88 0.63 145.94 97.61
13:50:01 5.97 1463028.44 3520.28 0.14 399012.98
139.21 0.69 133.79 95.63
14:00:01 13.85 1445805.09 3071.23 0.30 393987.10
131.68 8.85 137.08 97.55
14:10:01 25.07 1421646.44 3738.69 0.39 387701.97
164.25 20.15 166.93 90.53
14:20:01 11.89 1379723.10 4270.80 0.23 375872.58
146.70 14.93 125.28 77.51
14:30:01 8.31 1375180.31 5472.30 0.17 373244.28
134.46 3.91 119.24 86.18
14:40:01 10.11 1334036.49 8850.42 0.15 360701.23
159.57 4.10 154.27 94.25
14:50:01 82.80 1140616.24 12696.72 0.46 306044.83
159.30 3.28 125.51 77.20
15:00:01 19.21 1088806.11 14202.19 0.26 291642.70
161.19 4.74 111.28 67.06
15:10:01 27.08 1046627.43 17154.44 0.34 281435.13
192.43 7.53 102.38 51.20
15:20:01 68.72 1028855.37 14164.93 0.66 275401.73
215.65 4.13 135.70 61.74
15:30:01 16.75 992275.54 12239.61 0.23 265369.64
182.36 10.87 99.25 51.36
15:40:01 150.85 940090.67 12283.44 1.11 251461.55
299.20 23.75 142.78 44.21
15:50:01 132.14 977937.08 12619.63 1.00 261673.06
220.62 64.57 135.61 47.55
16:00:01 17.95 1024651.95 12030.00 0.28 274089.74
184.80 18.48 104.86 51.59
16:10:01 41.26 1023482.82 12726.94 0.38 274037.38
234.26 35.27 109.40 40.59
16:20:01 76.12 1026993.21 12549.89 0.47 274872.77
206.96 19.29 124.67 55.11
16:30:03 17.41 1012199.77 12135.95 0.27 270494.82
161.94 10.27 108.83 63.19
16:40:01 69.82 1016362.58 12766.07 0.64 271505.17
119.43 9.42 112.50 87.31
16:50:01 17.72 1026519.75 12774.39 0.18 274760.91
179.48 20.01 138.00 69.18
17:00:01 6.88 1033279.20 12364.86 0.13 276506.10
126.42 6.44 90.20 67.89
17:10:01 33.26 1018956.92 12867.66 0.49 272069.13
202.53 7.44 115.20 54.87
17:20:01 28.07 1040438.90 13080.03 0.35 278356.95
188.47 1.71 116.80 61.41
17:30:01 13.69 1052387.04 12603.56 0.16 281346.41
149.10 16.91 102.65 61.84
17:40:01 17.55 1223806.22 8258.37 0.30 330923.67
214.27 7.30 146.13 65.95
17:50:01 20.46 1424863.99 3607.95 0.33 388637.98
217.85 17.75 136.05 57.75
18:00:01 9.47 1435175.96 3076.28 0.21 391356.34
185.68 3.27 146.21 77.38
18:10:01 39.88 1408818.72 3579.11 0.53 384292.74
174.22 6.73 148.55 82.09
18:20:01 78.72 1408298.79 3394.73 0.54 384043.36
204.96 10.88 148.06 68.60
18:30:01 51.71 1408936.46 3101.97 0.31 384366.70
211.51 19.30 148.59 64.38
Average: 32.95 1200040.29 8385.19 0.34 324404.13
172.66 11.40 126.54 68.75
12:40:01 kbmemfree kbmemused %memused kbbuffers kbcached
kbcommit %commit kbactive kbinact kbdirty
12:50:01 451392 64439956 99.30 47944 2263748
17990440 0.60 56481888 3822316 87220
13:00:01 395572 64495776 99.39 47060 2156628
18012880 0.60 56586092 3776320 100392
13:10:01 375588 64515760 99.42 46372 2015544
18023380 0.60 56666464 3724456 82656
13:20:01 371580 64519768 99.43 42960 1862684
18038108 0.60 56753352 3646544 74712
13:30:01 387664 64503684 99.40 38288 1699400
17997108 0.60 56815292 3579896 100368
13:40:01 407416 64483932 99.37 37756 1530260
18050920 0.60 56885756 3495732 96496
13:50:01 384380 64506968 99.41 37492 1395668
18007024 0.60 56961776 3447744 69308
14:00:01 370912 64520436 99.43 37084 1249500
18042408 0.60 57049020 3374072 85240
14:10:01 430832 64460516 99.34 36476 1051056
18056976 0.60 57099724 3275024 72736
14:20:01 409092 64482256 99.37 36064 930640
18045188 0.60 57138080 3265412 90468
14:30:01 383788 64507560 99.41 36132 815988
18005000 0.60 57241368 3199932 73492
14:40:01 454772 64436576 99.30 35832 620456
18031016 0.60 57300680 3079968 62212
14:50:01 389056 64502292 99.40 35844 570248
18188116 0.61 57347356 3100696 50184
15:00:01 376236 64515112 99.42 35624 471872
18120144 0.60 57433844 3023324 31188
15:10:01 351076 64540272 99.46 36192 484056
18144660 0.61 57441692 3040976 43268
15:20:01 369376 64521972 99.43 35892 396844
18194364 0.61 57479424 2993376 24244
15:30:01 350816 64540532 99.46 16988 403452
18201032 0.61 57462032 3021052 5084
15:40:01 361708 64529640 99.44 35780 395412
18215232 0.61 57460724 3012920 48356
15:50:01 367740 64523608 99.43 35904 432400
18237484 0.61 57475064 2987216 52160
16:00:01 364612 64526736 99.44 30772 435952
18243788 0.61 57445236 3029688 6156
16:10:01 371876 64519472 99.43 36216 476668
18233160 0.61 57443644 3024052 31988
16:20:01 369688 64521660 99.43 35896 455088
18224132 0.61 57437980 3027880 28900
16:30:03 369128 64522220 99.43 36060 452908
18258964 0.61 57419672 3036052 38896
16:40:01 369420 64521928 99.43 36452 521608
18239212 0.61 57447508 3017172 15288
16:50:01 412064 64479284 99.36 36644 536480
18319720 0.61 57414720 3004872 31308
17:00:01 362868 64528480 99.44 36220 514224
18371112 0.61 57454484 3012064 33012
17:10:01 381992 64509356 99.41 36128 507728
18305896 0.61 57445048 3006644 35220
17:20:01 348128 64543220 99.46 36396 527712
18319784 0.61 57457988 2999732 36024
17:30:01 365352 64525996 99.44 36316 519996
18359776 0.61 57444096 3013648 44488
17:40:01 401872 64489476 99.38 36040 506764
18365400 0.61 57417724 3002256 98176
17:50:01 385680 64505668 99.41 35936 539116
18340608 0.61 57440976 3000548 101128
18:00:01 388136 64503212 99.40 35948 530852
18339400 0.61 57416176 3016880 82168
18:10:01 399332 64492016 99.38 35904 542400
18359172 0.61 57400064 3023684 73284
18:20:01 369256 64522092 99.43 35752 544800
18386912 0.61 57439340 3016916 91680
18:30:01 364256 64527092 99.44 30092 448544
18448408 0.62 57481544 2977968 66912
Average: 383219 64508129 99.41 36527 823048
18191912 0.61 57259595 3173629 58983
You can compare with how it was before:
# sar -rB -11 -e 10:00:00
Linux 3.10.0-229.20.1.el7.x86_64
(castor-dev2-1-ssu-1-1.xy01.xyratex.com) 11/08/16 _x86_64_ (20 CPU)
00:00:01 pgpgin/s pgpgout/s fault/s majflt/s pgfree/s
pgscank/s pgscand/s pgsteal/s %vmeff
00:10:01 16.15 1404641.02 3294.83 0.30 384068.82
232.61 2.51 130.05 55.31
00:20:01 4.74 1386234.27 3264.20 0.17 378183.96
131.42 46.21 150.36 84.65
00:30:01 16.81 1357082.95 2856.56 0.44 370191.72
171.20 7.29 131.70 73.78
00:40:01 10.56 1380877.77 3330.86 0.21 376939.96
137.89 0.13 129.86 94.09
00:50:01 13.36 1389993.97 3514.01 0.24 379609.43
129.31 2.11 130.64 99.41
01:00:01 4.81 1384278.89 2788.69 0.18 378195.35
97.28 34.40 126.75 96.26
01:10:01 19.40 1397710.30 3254.28 0.48 382363.61
159.35 16.09 144.62 82.43
01:20:01 20.13 1373687.69 3373.39 0.40 375604.74
183.20 8.65 142.67 74.37
01:30:01 8.07 1384095.36 2937.47 0.22 377786.50
140.68 2.34 105.38 73.68
01:40:01 29.87 1356288.95 4059.10 0.66 369618.89
180.17 22.32 139.33 68.81
01:50:01 12.11 1360606.12 6005.05 0.30 369811.12
162.28 12.94 133.57 76.23
02:00:01 15.43 1310682.12 8775.43 0.38 354317.43
140.11 2.45 124.60 87.40
02:10:01 160.55 1183661.76 12517.79 1.19 317775.22
245.93 7.94 159.73 62.92
02:20:01 13.92 1115703.40 12939.00 0.34 299746.54
139.83 25.68 111.89 67.60
02:30:01 27.84 1082827.92 12784.33 0.51 289803.97
166.12 12.25 116.07 65.07
02:40:01 107.16 1042108.13 13104.45 1.66 280838.24
536.21 52.80 198.50 33.70
02:50:01 200.74 1013103.67 12483.72 1.91 272091.10
180.10 40.44 117.32 53.20
03:00:01 45.46 951048.89 11588.68 0.70 253985.85
152.91 17.33 107.89 63.37
03:10:01 274.33 914538.01 11580.86 1.84 244733.49
276.00 23.02 157.40 52.64
03:20:01 230.53 946778.38 11850.88 1.68 252944.34
255.13 25.37 153.57 54.75
03:30:01 33.31 951669.66 11559.20 0.49 254101.69
231.74 8.91 105.05 43.65
03:40:01 193.92 948298.99 11803.87 1.27 253376.52
205.85 40.59 135.43 54.96
03:50:01 209.60 944570.03 11719.10 1.68 253621.15
393.70 84.65 155.59 32.53
04:00:04 42.38 963933.85 11575.27 0.72 258323.08
184.07 23.46 109.61 52.82
04:10:01 184.68 935221.76 11612.56 1.55 249601.47
253.38 62.29 160.08 50.71
04:20:01 170.13 957115.71 11844.09 1.47 255755.14
189.18 17.96 132.43 63.93
04:30:01 22.73 962524.12 11491.38 0.49 256996.19
243.93 16.37 121.87 46.82
04:40:01 163.59 1016805.90 12686.28 1.38 273720.39
184.26 33.65 123.36 56.61
04:50:01 196.51 980225.02 12164.08 1.48 261900.97
322.95 1.58 148.96 45.90
05:00:01 33.60 987241.49 11727.46 0.85 263974.46
218.17 5.10 122.89 55.04
05:10:01 178.82 981502.18 12035.80 1.45 263338.30
207.56 30.26 127.70 53.70
05:20:01 161.28 975806.81 12097.08 1.49 261729.22
286.58 11.61 140.77 47.21
05:30:01 20.69 1031886.75 12458.76 0.48 275536.39
142.55 1.72 115.66 80.16
05:40:01 155.15 1040222.10 12654.04 1.52 278109.73
219.58 2.17 133.89 60.38
05:50:02 161.97 1051745.35 13017.94 1.35 280364.86
243.50 0.82 140.48 57.50
06:00:01 11.48 1040054.57 12496.37 0.45 277647.70
193.47 1.71 102.83 52.68
06:10:01 78.58 1047165.77 12873.49 1.08 281039.20
301.84 9.43 123.11 39.55
06:20:01 31.89 1031681.84 12845.93 0.74 275854.99
295.80 18.28 119.52 38.05
06:20:01 pgpgin/s pgpgout/s fault/s majflt/s pgfree/s
pgscank/s pgscand/s pgsteal/s %vmeff
06:30:01 29.16 954012.01 11468.69 0.68 255034.94
257.05 7.65 93.99 35.51
06:40:01 174.64 948330.61 12026.78 1.52 254053.36
335.23 77.66 161.41 39.09
06:50:02 206.84 948250.20 11888.93 2.09 253588.96
297.95 84.36 118.77 31.07
07:00:01 78.79 907991.32 11184.25 2.01 242885.50
443.94 141.27 178.75 30.54
07:10:02 220.70 967317.05 11910.45 2.03 258254.43
195.45 48.15 104.63 42.95
07:20:01 246.72 907821.00 11519.52 2.05 242241.12
473.27 47.81 172.09 33.03
07:30:01 26.82 912501.70 11180.66 0.53 243061.75
302.41 7.15 92.05 29.74
07:40:01 208.51 908719.26 11516.04 1.57 242513.90
395.00 81.67 139.60 29.29
07:50:02 250.95 878989.78 11274.06 2.25 234792.89
457.96 101.79 183.52 32.79
08:00:01 39.00 906980.45 11138.19 0.76 241717.84
284.69 56.45 66.59 19.52
08:10:01 284.57 860345.15 10982.99 2.23 229377.75
704.29 60.74 162.32 21.22
08:20:02 270.84 894864.88 11444.78 2.32 238843.40
855.66 93.73 182.15 19.19
08:30:01 117.18 881583.22 10800.16 1.35 235006.90
879.26 92.42 95.46 9.82
08:40:01 387.30 848196.38 10971.65 4.08 226516.28
1766.13 81.07 183.09 9.91
08:50:02 510.00 823844.11 10676.30 4.26 219795.20
11058.82 328.04 235.80 2.07
09:00:01 587.25 753398.48 9799.37 15.02 203298.15
2790216.53 232433.56 252.03 0.01
09:10:01 726.68 714463.50 9959.91 19.55 194575.96
3512104.61 203148.26 267.57 0.01
09:20:02 1178.01 698973.34 13755.88 28.46 196646.42
2537620.87 172806.01 406.69 0.02
09:30:01 141.38 5648.11 1969.17 3.42 3386.52
1523.34 74.06 35.22 2.20
09:40:01 207.36 8.62 1151.16 2.07 1229.41
516.08 15.16 52.49 9.88
09:50:01 197.88 35.85 1164.62 2.00 1071.57
455.04 17.15 43.76 9.27
Average: 158.89 988256.17 9707.94 2.27 266132.70
150340.53 10347.54 139.99 0.09
00:00:01 kbmemfree kbmemused %memused kbbuffers kbcached
kbcommit %commit kbactive kbinact kbdirty
00:10:01 398544 64492804 99.39 40904 2276864
17750540 0.59 56426672 3899348 98240
00:20:01 441496 64449852 99.32 40060 2083052
17750804 0.59 56490908 3799812 100308
00:30:01 427920 64463428 99.34 39660 1936852
17771604 0.59 56570748 3729996 71680
00:40:01 435424 64455924 99.33 39620 1789040
17750644 0.59 56649744 3660540 100336
00:50:01 425944 64465404 99.34 39000 1641252
17750668 0.59 56738996 3588252 84644
01:00:01 406188 64485160 99.37 38340 1503840
17800380 0.59 56841136 3509300 98720
01:10:01 419436 64471912 99.35 37556 1334484
17796612 0.59 56917820 3421032 77480
01:20:01 454904 64436444 99.30 37256 1179180
17765700 0.59 56975044 3352512 22496
01:30:01 377404 64513944 99.42 36912 1100256
17726548 0.59 57109180 3297516 102600
01:40:01 376152 64515196 99.42 36700 948500
17769548 0.59 57179960 3231004 84488
01:50:01 381752 64509596 99.41 36724 801320
17771416 0.59 57255664 3160112 77400
02:00:01 376536 64514812 99.42 36556 666152
17849088 0.60 57323040 3105728 50264
02:10:01 395088 64496260 99.39 36072 583516
17754188 0.59 57348064 3065888 44128
02:20:01 374968 64516380 99.42 36268 490412
17854120 0.60 57409004 3024260 40088
02:30:01 364016 64527332 99.44 19548 411300
17839936 0.60 57463636 2985004 4688
02:40:01 443248 64448100 99.32 8564 318156
17897900 0.60 57372164 2992728 5488
02:50:01 352792 64538556 99.46 36000 343600
17912884 0.60 57452744 3005652 29320
03:00:01 363212 64528136 99.44 8984 304220
17857616 0.60 57527524 2919524 16064
03:10:01 368376 64522972 99.43 5876 339784
17972788 0.60 57504872 2942548 29676
03:20:01 375252 64516096 99.42 35908 293344
17987500 0.60 57478156 2957516 32196
03:30:01 385104 64506244 99.41 5752 321424
17865424 0.60 57453188 2979400 24976
03:40:01 365052 64526296 99.44 12292 329148
17915148 0.60 57511448 2940432 17920
03:50:01 366604 64524744 99.44 35664 330620
17962012 0.60 57453372 2992128 21452
04:00:04 365136 64526212 99.44 5720 337220
17933724 0.60 57480432 2970224 1832
04:10:01 400772 64490576 99.38 11492 323164
17954392 0.60 57420320 2986376 26988
04:20:01 395976 64495372 99.39 35824 333564
17961036 0.60 57463112 2955224 33324
04:30:01 443440 64447908 99.32 10612 302404
18052728 0.60 57443820 2929944 2260
04:40:01 396616 64494732 99.39 36304 325844
17988460 0.60 57450692 2963008 33752
04:50:01 390196 64501152 99.40 35948 332368
18006884 0.60 57467744 2948932 28452
05:00:01 425740 64465608 99.34 10640 301788
18018220 0.60 57446200 2942148 21504
05:10:01 394020 64497328 99.39 34668 330452
18042300 0.60 57462580 2952032 25512
05:20:01 392720 64498628 99.39 35868 359960
17997036 0.60 57461848 2957944 24752
05:30:01 412140 64479208 99.36 10952 340188
18032556 0.60 57452104 2944352 31972
05:40:01 397212 64494136 99.39 31560 415388
18055992 0.60 57393964 3019064 35752
05:50:02 385960 64505388 99.41 36384 427728
18048676 0.60 57433620 2987148 26508
06:00:01 389056 64502292 99.40 31820 447560
18109392 0.60 57413784 3005420 27844
06:10:01 390460 64500888 99.40 36180 425804
18055028 0.60 57423380 2993544 26900
06:20:01 348872 64542476 99.46 23412 346220
18180900 0.61 57504260 2962424 54312
06:20:01 kbmemfree kbmemused %memused kbbuffers kbcached
kbcommit %commit kbactive kbinact kbdirty
06:30:01 383212 64508136 99.41 10780 320716
18037288 0.60 57485372 2936344 18724
06:40:01 430536 64460812 99.34 10528 269148
18207168 0.61 57467604 2913220 27528
06:50:02 360936 64530412 99.44 35904 313088
18089936 0.60 57495212 2950468 22564
07:00:01 436180 64455168 99.33 2764 285604
18211532 0.61 57428600 2930812 22964
07:10:02 367076 64524272 99.43 19508 342588
18111152 0.60 57466580 2963400 20176
07:20:01 363380 64527968 99.44 31204 296676
18170900 0.61 57505540 2935904 18576
07:30:01 344552 64546796 99.47 2404 297296
18229132 0.61 57517812 2936092 16224
07:40:01 346232 64545116 99.47 5980 309552
18251668 0.61 57529104 2926776 15660
07:50:02 377344 64514004 99.42 5164 248264
18229748 0.61 57534464 2895440 9816
08:00:01 362056 64529292 99.44 2424 266640
18190456 0.61 57544288 2899040 8792
08:10:01 366340 64525008 99.44 2924 271820
18233488 0.61 57535464 2901500 15792
08:20:02 364604 64526744 99.44 4636 210400
18279788 0.61 57553236 2889244 7712
08:30:01 362364 64528984 99.44 2100 257252
18267668 0.61 57546552 2892036 24424
08:40:01 368580 64522768 99.43 1992 243256
18247696 0.61 57561308 2879664 3404
08:50:02 359044 64532304 99.45 1828 167736
18265192 0.61 57616672 2849180 6492
09:00:01 344344 64547004 99.47 1832 188956
18346860 0.61 57659208 2826504 4692
09:10:01 347712 64543636 99.46 1816 204228
18306036 0.61 57640468 2828728 4180
09:20:02 363428 64527920 99.44 1616 150076
19041536 0.64 57638924 2818804 4048
09:30:01 394796 64496552 99.39 1920 144876
18317028 0.61 57612308 2826476 176
09:40:01 391140 64500208 99.40 35384 109440
18318936 0.61 57577156 2862968 188
09:50:01 369640 64521708 99.43 35228 130556
18312972 0.61 57596304 2858088 184
Average: 386563 64504785 99.40 22128 537358
18036891 0.60 57367511 3047436 32011
Now, with the following settings also our performance problems
vanished completely:
sysctl -w vm.swappiness=100
sysctl -w vm.dirty_background_ratio=80
sysctl -w vm.dirty_ratio=90
Thank you,
Andriy
On Fri, Aug 12, 2016 at 9:52 PM, Andriy Tkachuk
<andriy.tkachuk@...gate.com> wrote:
> Hi,
>
> our user-space application uses large amount of anon pages (private
> mapping of the large file, more than 64GB RAM available in the system)
> which are rarely accessible and are supposed to be swapped out.
> Instead, we see that most of these pages are kept in memory while the
> system suffers from the lack of free memory and overall performance
> (especially the disk I/O, vm.swappiness=100 does not help it). kswapd
> scans millions of pages per second but reclames hundreds per sec only.
> Here are the 5 secs interval snapshots of some counters:
>
> $ egrep 'Cached|nr_.*active_anon|pgsteal_.*_normal|pgscan_kswapd_normal|pgrefill_normal|nr_vmscan_write|nr_swap|pgact'
> proc-*-0616-1605[345]* | sed 's/:/ /' | sort -sk 2,2
> proc-meminfo-0616-160539.txt Cached: 347936 kB
> proc-meminfo-0616-160549.txt Cached: 316316 kB
> proc-meminfo-0616-160559.txt Cached: 322264 kB
> proc-meminfo-0616-160539.txt SwapCached: 2853064 kB
> proc-meminfo-0616-160549.txt SwapCached: 2853168 kB
> proc-meminfo-0616-160559.txt SwapCached: 2853280 kB
> proc-vmstat-0616-160535.txt nr_active_anon 14508616
> proc-vmstat-0616-160545.txt nr_active_anon 14513725
> proc-vmstat-0616-160555.txt nr_active_anon 14515197
> proc-vmstat-0616-160535.txt nr_inactive_anon 747407
> proc-vmstat-0616-160545.txt nr_inactive_anon 744846
> proc-vmstat-0616-160555.txt nr_inactive_anon 744509
> proc-vmstat-0616-160535.txt nr_vmscan_write 5589095
> proc-vmstat-0616-160545.txt nr_vmscan_write 5589097
> proc-vmstat-0616-160555.txt nr_vmscan_write 5589097
> proc-vmstat-0616-160535.txt pgactivate 246016824
> proc-vmstat-0616-160545.txt pgactivate 246033242
> proc-vmstat-0616-160555.txt pgactivate 246042064
> proc-vmstat-0616-160535.txt pgrefill_normal 22763262
> proc-vmstat-0616-160545.txt pgrefill_normal 22768020
> proc-vmstat-0616-160555.txt pgrefill_normal 22768178
> proc-vmstat-0616-160535.txt pgscan_kswapd_normal 111985367420
> proc-vmstat-0616-160545.txt pgscan_kswapd_normal 111996845554
> proc-vmstat-0616-160555.txt pgscan_kswapd_normal 112028276639
> proc-vmstat-0616-160535.txt pgsteal_direct_normal 344064
> proc-vmstat-0616-160545.txt pgsteal_direct_normal 344064
> proc-vmstat-0616-160555.txt pgsteal_direct_normal 344064
> proc-vmstat-0616-160535.txt pgsteal_kswapd_normal 53817848
> proc-vmstat-0616-160545.txt pgsteal_kswapd_normal 53818626
> proc-vmstat-0616-160555.txt pgsteal_kswapd_normal 53818637
>
> The pgrefill_normal and pgactivate counters show that only few
> hundreds/sec pages move from active to inactive and vice versa lists -
> that is comparable with what was reclaimed. So it looks like kswapd
> scans the pages from inactive list mostly in kind of a loop and does
> not even have a chance to look at the pages from the active list
> (where most of the application's anon pages are located).
>
> The kernel version: linux-3.10.0-229.14.1.el7.
>
> Any ideas? Would be be useful to change inactive_ratio dynamically in
> such a cases so that more pages could be moved from active to inactive
> list and get a chance to be reclaimed? (Note: when application is
> restarted - the problem disappears for a while (days) until the
> correspondent number of privately mapped pages are dirtied again.)
>
> Thank you,
> Andriy
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