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[Bug 16348] kswapd continuously active when doing IO

To: xfs-masters@xxxxxxxxxxx
Subject: [Bug 16348] kswapd continuously active when doing IO
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
Date: Tue, 13 Jul 2010 06:43:58 GMT
Auto-submitted: auto-generated
In-reply-to: <bug-16348-470@xxxxxxxxxxxxxxxxxxxxxxxxx/>
References: <bug-16348-470@xxxxxxxxxxxxxxxxxxxxxxxxx/>
https://bugzilla.kernel.org/show_bug.cgi?id=16348





--- Comment #9 from wwwutz@xxxxxxxxxxxxx <wwwutz@xxxxxxxxxxxxx>  2010-07-13 
06:43:53 ---
Here's the output of top/slabtop running on a 32 GB RAM machine:
---------------------------------
start, 8 out of 32 GB RAM used
---------------------------------

top - 08:32:13 up 21:48,  4 users,  load average: 0.00, 0.00, 0.00
Tasks: 267 total,   1 running, 266 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.1%sy,  0.0%ni, 99.9%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  33077232k total,  8384520k used, 24692712k free,   252740k buffers
Swap: 65537160k total,        0k used, 65537160k free,  2744916k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
 6055 root      20   0  4512 1288  736 S    7  0.0   0:05.35 slabtop            
    1 root      20   0  1624  480  408 S    0  0.0   0:01.25 init               
    2 root      20   0     0    0    0 S    0  0.0   0:00.00 kthreadd           
    3 root      RT   0     0    0    0 S    0  0.0   0:00.05 migration/0        
    4 root      20   0     0    0    0 S    0  0.0   0:01.49 ksoftirqd/0        
    5 root      RT   0     0    0    0 S    0  0.0   0:00.03 migration/1        
    6 root      20   0     0    0    0 S    0  0.0   0:01.82 ksoftirqd/1        
    7 root      RT   0     0    0    0 S    0  0.0   0:00.01 migration/2        
[...]
 Active / Total Objects (% used)    : 12463647 / 13977711 (89.2%)
 Active / Total Slabs (% used)      : 1305429 / 1305429 (100.0%)
 Active / Total Caches (% used)     : 95 / 223 (42.6%)
 Active / Total Size (% used)       : 4892545.30K / 5125737.29K (95.5%)
 Minimum / Average / Maximum Object : 0.02K / 0.37K / 4096.00K

  OBJS ACTIVE  USE OBJ SIZE  SLABS OBJ/SLAB CACHE SIZE NAME                   
4716283 4595683  97%    0.06K  79937       59    319748K size-64
3913260 3809455  97%    0.19K 195663       20    782652K dentry
3753424 3723471  99%    1.00K 938356        4   3753424K xfs_inode
1219187  80374   6%    0.10K  32951       37    131804K buffer_head
204939  97428  47%    0.54K  29277        7    117108K radix_tree_node
 77495  77479  99%    0.70K  15499        5     61996K reiser_inode_cache
 21420  21164  98%    0.12K    714       30      2856K size-128
 13621  13444  98%    0.07K    257       53      1028K sysfs_dir_cache
 10528   9091  86%    0.03K     94      112       376K size-32
  8684   8684 100%    4.00K   8684        1     34736K size-4096
  5680   3189  56%    0.19K    284       20      1136K size-192
  2885   2873  99%    0.77K    577        5      2308K shmem_inode_cache
  2849   1880  65%    0.05K     37       77       148K anon_vma_chain
  2438   1703  69%    0.07K     46       53       184K Acpi-Operand
  2398   1913  79%    0.17K    109       22       436K vm_area_struct
  2064   1806  87%    1.00K    516        4      2064K size-1024
  1950   1621  83%    0.61K    325        6      1300K proc_inode_cache
  1840   1365  74%    0.19K     92       20       368K filp
  1776   1693  95%    0.50K    222        8       888K size-512
  1728   1072  62%    0.02K     12      144        48K anon_vma
  1510   1467  97%    2.00K    755        2      3020K size-2048
  1470   1070  72%    0.25K     98       15       392K skbuff_head_cache
  1140    404  35%    0.12K     38       30       152K cred_jar
   900    798  88%    0.25K     60       15       240K size-256

-------------------------------------
5 minutes later, 27 out of 32 GB used
-------------------------------------

top - 08:36:59 up 21:53,  5 users,  load average: 1.32, 0.54, 0.20
Tasks: 274 total,   1 running, 273 sleeping,   0 stopped,   0 zombie
Cpu(s):  4.8%us,  5.1%sy,  0.0%ni, 79.5%id,  9.6%wa,  0.1%hi,  0.8%si,  0.0%st
Mem:  33077232k total, 27160668k used,  5916564k free,   252740k buffers
Swap: 65537160k total,        0k used, 65537160k free, 21326208k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
 6209 solidata  20   0 27356 6724 1696 S   36  0.0   0:46.69 solidmirror        
 6157 root      20   0 26160 6664 1632 S   25  0.0   0:29.76 pmirror            
 6154 root      20   0 27776 8288 1656 D   18  0.0   0:19.73 pmirror            
 6264 root      20   0  4244 1136  736 S    6  0.0   0:01.06 slabtop            
 6134 root      20   0     0    0    0 S    2  0.0   0:01.92 flush-8:80         
  594 root      20   0     0    0    0 S    1  0.0   0:06.78 xfsdatad/4         
 Active / Total Objects (% used)    : 15002352 / 15335899 (97.8%)
 Active / Total Slabs (% used)      : 1348855 / 1348971 (100.0%)
 Active / Total Caches (% used)     : 104 / 223 (46.6%)
 Active / Total Size (% used)       : 5206572.94K / 5289652.04K (98.4%)
 Minimum / Average / Maximum Object : 0.02K / 0.34K / 4096.00K

  OBJS ACTIVE  USE OBJ SIZE  SLABS OBJ/SLAB CACHE SIZE NAME                   
4717522 4606213  97%    0.06K  79958       59    319832K size-64
3913420 3823949  97%    0.19K 195671       20    782684K dentry
3753528 3737799  99%    1.00K 938382        4   3753528K xfs_inode
2506380 2474638  98%    0.10K  67740       37    270960K buffer_head
255066 187566  73%    0.54K  36438        7    145752K radix_tree_node
 77500  77481  99%    0.70K  15500        5     62000K reiser_inode_cache
 21420  21237  99%    0.12K    714       30      2856K size-128
 13621  13446  98%    0.07K    257       53      1028K sysfs_dir_cache
 10528   9105  86%    0.03K     94      112       376K size-32
  8812   8764  99%    4.00K   8812        1     35248K size-4096
  7140   7137  99%    0.18K    340       21      1360K xfs_ili
  5680   3349  58%    0.19K    284       20      1136K size-192


----------------------------------------------
2 minutes later. 32 GB used, kswapd popping up
----------------------------------------------

top - 08:38:08 up 21:54,  5 users,  load average: 1.98, 0.86, 0.33
Tasks: 274 total,   5 running, 269 sleeping,   0 stopped,   0 zombie
Cpu(s):  3.3%us, 40.2%sy,  0.0%ni, 50.1%id,  5.7%wa,  0.0%hi,  0.8%si,  0.0%st
Mem:  33077232k total, 32977904k used,    99328k free,   252740k buffers
Swap: 65537160k total,        0k used, 65537160k free, 27063272k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
  556 root      20   0     0    0    0 R  100  0.0 141:58.60 kswapd0            
  557 root      20   0     0    0    0 R  100  0.0 138:30.02 kswapd1            
 6154 root      20   0 27776 8288 1656 R   97  0.0   0:49.16 pmirror            
 6209 solidata  20   0 27356 6872 1704 S   30  0.0   1:09.87 solidmirror        
 6157 root      20   0 26160 6664 1632 R   14  0.0   0:51.78 pmirror            
 6264 root      20   0  4244 1136  736 S    7  0.0   0:03.97 slabtop            
 6134 root      20   0     0    0    0 D    3  0.0   0:03.09 flush-8:80         
  594 root      20   0     0    0    0 S    1  0.0   0:07.33 xfsdatad/4         
   16 root      20   0     0    0    0 S    0  0.0   0:02.15 ksoftirqd/6        
11048 solidata  20   0  8820 1468  976 R    0  0.0   3:21.10 top                
    1 root      20   0  1624  480  408 S    0  0.0   0:01.25 init               
    2 root      20   0     0    0    0 S    0  0.0   0:00.00 kthreadd           
 Active / Total Objects (% used)    : 15491439 / 15986833 (96.9%)
 Active / Total Slabs (% used)      : 1366347 / 1366507 (100.0%)
 Active / Total Caches (% used)     : 104 / 223 (46.6%)
 Active / Total Size (% used)       : 5259346.41K / 5355544.54K (98.2%)
 Minimum / Average / Maximum Object : 0.02K / 0.33K / 4096.00K

  OBJS ACTIVE  USE OBJ SIZE  SLABS OBJ/SLAB CACHE SIZE NAME                   
4718171 4501369  95%    0.06K  79969       59    319876K size-64
3912540 3711758  94%    0.19K 195627       20    782508K dentry
3753212 3736699  99%    1.00K 938303        4   3753212K xfs_inode
3156729 3156729 100%    0.10K  85317       37    341268K buffer_head
255017 208730  81%    0.54K  36431        7    145724K radix_tree_node
 77480  77449  99%    0.70K  15496        5     61984K reiser_inode_cache
 21420  21275  99%    0.12K    714       30      2856K size-128
 13621  13444  98%    0.07K    257       53      1028K sysfs_dir_cache
 10528   9129  86%    0.03K     94      112       376K size-32
  8717   8689  99%    4.00K   8717        1     34868K size-4096
  7266   7251  99%    0.18K    346       21      1384K xfs_ili
  5760   3634  63%    0.19K    288       20      1152K size-192

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