Disregard my last comment.
For 21 days my system run fine, but now I ran into this bug again.
At the time this problem occurred, I ran the following commands to produce
debug info:
free > free.txt
cp /var/log/syslog .
sudo iotop -b -n 20 > iotop.txt
sudo iotop -b -n 20 > iotop2.txt
For example, the contents of free.txt:
total used free shared buffers cached
Mem: 4049532 1064740 2984792 0 1168 143196
-/+ buffers/cache: 920376 3129156
Swap: 2047996 1893072 154924
It shows that there are 3G free memory, but still almost 100% of swap is
used.
Also output of iotop shows kswapd taking large amounts of IO:
sjs@zen:[~/debug2] $ grep kswapd iotop.txt
52 be/4 root 0.00 B/s 1438.75 K/s 0.00 % 30.60 % [kswapd0]
52 be/4 root 0.00 B/s 6.04 M/s 0.00 % 71.55 % [kswapd0]
52 be/4 root 0.00 B/s 19.83 M/s 0.00 % 71.03 % [kswapd0]
52 be/4 root 0.00 B/s 4.38 M/s 0.00 % 73.57 % [kswapd0]
52 be/4 root 0.00 B/s 1834.34 K/s 0.00 % 74.48 % [kswapd0]
52 be/4 root 0.00 B/s 2.32 M/s 0.00 % 41.74 % [kswapd0]
52 be/4 root 0.00 B/s 2.26 M/s 0.00 % 99.99 % [kswapd0]
52 be/4 root 0.00 B/s 3.21 M/s 0.00 % 72.26 % [kswapd0]
52 be/4 root 0.00 B/s 631.74 K/s 0.00 % 99.99 % [kswapd0]
52 be/4 root 0.00 B/s 3.35 M/s 0.00 % 58.51 % [kswapd0]
52 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kswapd0]
52 be/4 root 0.00 B/s 150.45 K/s 0.00 % 99.99 % [kswapd0]
52 be/4 root 0.00 B/s 0.00 B/s 0.00 % 99.99 % [kswapd0]
52 be/4 root 0.00 B/s 1913.03 K/s 0.00 % 64.42 % [kswapd0]
52 be/4 root 0.00 B/s 145.83 M/s 0.00 % 99.99 % [kswapd0]
52 be/4 root 0.00 B/s 4.20 M/s 0.00 % 49.05 % [kswapd0]
52 be/4 root 0.00 B/s 19.72 M/s 0.00 % 99.99 % [kswapd0]
52 be/4 root 0.00 B/s 3.37 M/s 0.00 % 66.38 % [kswapd0]
52 be/4 root 0.00 B/s 2023.94 K/s 0.00 % 98.58 % [kswapd0]
52 be/4 root 0.00 B/s 2023.70 K/s 0.00 % 18.11 % [kswapd0]
I have also attached my syslog. I resumed the computer from suspend at Mar 10
19:16:02. I waited for around 20 minutes for the IO load to go down, but it
didn't, so I rebooted my computer.
I will test the upstream kernel, but it will probably take several weeks
to determine if they fix this problem or not..
** Attachment added: "1127913_debug.zip"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1127913/+attachment/3566958/+files/1127913_debug.zip
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https://bugs.launchpad.net/bugs/1127913
Title:
kswapd (kswapd0) takes 99% IO after resuming from suspend
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