From one point of view, you
said that filesystem generates I/O activity but as a result you haven't
disk activity.
Yes, iotop shows activity on flush process about 5-15 GB/S - but my HDD
does not write anything at this time.
> Does it means that you create any files but you haven't
it on partition after umount?
No, there is no problems with data loss or corruption. High IO activity
on flush process happens when I do not modify anything. Most often it
happens in 1-2 minutes after OS boot. I found, that frequency of
described behaviour somehow related to my access to files on that
filesystem: when I read or, write files, the frequency of described
behaviour increasing, but when system is idle - flush process stops it's
wierd IO activity after some time.
Could you share more details about your configuration and situation?
Sorry, I don't have access to my PC right now, but i've captured "ps ax"
command output when flush processes are working. Also, I'll try to
reproduce this strange behavior on quemu virtual machine. Maybe there is
something wrong with my configuration...
this processes are related to devices, that run nilfs2 filesystem:
474 ? R 0:09 [flush-253:0]
2388 ? R 1:30 [flush-253:5]
PID TTY STAT TIME COMMAND
1 ? Ss 0:01 /sbin/init
2 ? S 0:00 [kthreadd]
3 ? S 0:00 [ksoftirqd/0]
4 ? S 0:00 [kworker/0:0]
5 ? S< 0:00 [kworker/0:0H]
6 ? S 0:00 [kworker/u:0]
7 ? S< 0:00 [kworker/u:0H]
8 ? S 0:00 [migration/0]
9 ? S 0:00 [rcuc/0]
10 ? S 0:00 [rcun/0]
11 ? S 0:00 [rcub/0]
12 ? S 0:00 [rcun/1]
13 ? S 0:00 [rcub/1]
14 ? S 0:00 [watchdog/0]
15 ? S 0:00 [migration/1]
16 ? S 0:00 [kworker/1:0]
17 ? S< 0:00 [kworker/1:0H]
18 ? S 0:00 [rcuc/1]
19 ? S 0:00 [ksoftirqd/1]
20 ? S 0:00 [watchdog/1]
21 ? S 0:00 [migration/2]
22 ? S 0:00 [kworker/2:0]
23 ? S< 0:00 [kworker/2:0H]
24 ? S 0:00 [rcuc/2]
25 ? S 0:00 [ksoftirqd/2]
26 ? S 0:00 [watchdog/2]
27 ? S 0:00 [migration/3]
28 ? S 0:00 [kworker/3:0]
29 ? S< 0:00 [kworker/3:0H]
30 ? S 0:00 [rcuc/3]
31 ? S 0:00 [ksoftirqd/3]
32 ? S 0:00 [watchdog/3]
33 ? S< 0:00 [cpuset]
34 ? S< 0:00 [khelper]
35 ? S 0:00 [kdevtmpfs]
36 ? S< 0:00 [netns]
37 ? S 0:00 [bdi-default]
38 ? S< 0:00 [kintegrityd]
39 ? S< 0:00 [kblockd]
40 ? S< 0:00 [ata_sff]
41 ? S 0:00 [khubd]
42 ? S< 0:00 [md]
43 ? S 0:00 [kworker/0:1]
44 ? S 0:00 [kworker/2:1]
45 ? S 0:00 [khungtaskd]
46 ? S 0:00 [kswapd0]
47 ? SN 0:00 [ksmd]
48 ? SN 0:00 [khugepaged]
49 ? S 0:00 [fsnotify_mark]
50 ? S< 0:00 [crypto]
55 ? S< 0:00 [kthrotld]
56 ? S 0:00 [scsi_eh_0]
57 ? S 0:00 [scsi_eh_1]
58 ? S 0:00 [scsi_eh_2]
59 ? S 0:00 [scsi_eh_3]
60 ? S 0:00 [scsi_eh_4]
61 ? S 0:00 [scsi_eh_5]
62 ? S 0:00 [kworker/u:1]
63 ? S 0:00 [kworker/u:2]
64 ? S 0:00 [kworker/u:3]
65 ? S 0:00 [kworker/u:4]
66 ? S 0:00 [kworker/u:5]
67 ? S 0:00 [kworker/u:6]
68 ? S< 0:00 [kpsmoused]
69 ? S< 0:00 [deferwq]
70 ? S 0:00 [kworker/u:7]
71 ? S 0:00 [kworker/3:1]
72 ? S 0:00 [kworker/u:8]
73 ? S< 0:00 [kworker/0:1H]
76 ? S 0:00 [kworker/1:1]
106 ? S 0:00 [scsi_eh_6]
107 ? S 0:00 [scsi_eh_7]
130 ? S< 0:00 [xfsalloc]
131 ? S< 0:00 [xfs_mru_cache]
132 ? S< 0:00 [xfslogd]
147 ? S< 0:00 [kmpath_rdacd]
303 ? S< 0:00 [kworker/2:1H]
306 ? S 0:00 [md0_raid1]
405 ? S< 0:00 [kdmflush]
406 ? S< 0:00 [kcryptd_io]
409 ? S< 0:00 [kcryptd]
437 ? S 0:00 [segctord]
438 ? S< 0:00 [kworker/3:1H]
447 ? S 0:01 [kworker/0:2]
474 ? R 0:09 [flush-253:0]
488 ? S 0:00 [kauditd]
489 ? Ss 0:00 /lib/systemd/systemd-stdout-syslog-bridge
490 ? S 0:00 [kworker/2:2]
497 ? Ss 0:00 /sbin/udevd
512 ? S 0:00 [kworker/3:2]
520 ? S< 0:00 [kworker/1:1H]
532 ? S 0:00 [kworker/1:2]
716 ? S< 0:00 [kvm-irqfd-clean]
733 ? S 0:00 [irq/42-mei]
751 ? S< 0:00 [hd-audio0]
860 ? S 0:00 [md200_raid1]
865 ? S 0:00 [md250_raid1]
878 ? S< 0:00 [kdmflush]
879 ? S< 0:00 [kcryptd_io]
880 ? S< 0:00 [kcryptd]
882 ? S< 0:00 [kdmflush]
885 ? S< 0:00 [kcryptd_io]
886 ? S< 0:00 [kcryptd]
931 ? S< 0:00 [kdmflush]
933 ? S< 0:00 [kcryptd_io]
934 ? S< 0:00 [kcryptd]
938 ? S< 0:00 [kdmflush]
939 ? S< 0:00 [kcryptd_io]
940 ? S< 0:00 [kcryptd]
952 ? S< 0:00 [xfs-data/dm-4]
953 ? S< 0:00 [xfs-conv/dm-4]
954 ? S< 0:00 [xfs-cil/dm-4]
955 ? S 0:00 [xfsaild/dm-4]
972 ? S< 0:00 [kdmflush]
973 ? S< 0:00 [kcryptd_io]
974 ? S< 0:00 [kcryptd]
982 ? S< 0:00 [xfs-data/dm-3]
983 ? S< 0:00 [xfs-conv/dm-3]
984 ? S< 0:00 [xfs-cil/dm-3]
985 ? S 0:00 [xfsaild/dm-3]
1010 ? S 0:00 [kjournald]
1019 ? S 0:00 [segctord]
1020 ? Ss 0:00 /sbin/nilfs_cleanerd -n /dev/mapper/raid_new
/mnt/raid
1079 ? Ss 0:00 /lib/systemd/systemd-logind
1092 ? Ss 0:00 /usr/bin/vmware-usbarbitrator
1112 ? Sl 0:00 /sbin/rsyslogd -c 5 -f /etc/rsyslog.conf
1127 ? Ssl 0:00 /usr/sbin/NetworkManager --no-daemon
1130 ? Ss 0:00 /sbin/haveged -w 1024 -v 1
1131 ? Ss 0:00 /sbin/acpid
1136 ? Ss 0:00 /bin/dbus-daemon --system --address=systemd:
--nofork --systemd-activation
1137 ? Ss 0:00 /usr/sbin/nscd
1174 ? S 0:00 [flush-8:0]
1175 ? S 0:00 [flush-253:1]
1176 ? S 0:00 [flush-253:2]
1223 ? Sl 0:00 /usr/lib/polkit-1/polkitd --no-debug
1237 ? Ss 0:00 /sbin/nilfs_cleanerd -c
/etc/nilfs_cleanerd_rootfs.conf /dev/mapper/system
1241 ? S 0:00 /usr/bin/kdm
1243 ? S 0:00 /usr/sbin/modem-manager
1261 ? Ss 0:00 /usr/sbin/cron -n
1288 ? Ss 0:00 /usr/sbin/cupsd -C /etc/cups/cupsd.conf
1323 ? Ss 0:00 /usr/sbin/mcelog --daemon --pidfile
/var/run/mcelog.pid
1357 tty1 Ss+ 0:00 /sbin/agetty tty1 38400
1434 ? S 0:00 /sbin/dhclient -d -4 -sf
/usr/lib/nm-dhcp-client.action -pf /var/run/dhclient-eth0.pid -lf
/var/lib/dhcp/dhclient-aa5261fd-d435-41e1-ae57-64a820a9b479-eth0.lease
-cf /var/run/nm-dhclie
1497 tty7 Ss+ 0:01 /usr/bin/Xorg -br :0 vt7 -nolisten tcp -auth
/var/lib/xdm/authdir/authfiles/A:0-tVZebb
1498 ? Ssl 0:00 /usr/lib/vmware/bin/vmware-vmblock-fuse -o
subtype=vmware-vmblock,default_permissions,allow_other /var/run/vmblock-fuse
1509 ? S 0:00 /sbin/udevd
1511 ? S 0:00 /sbin/udevd
1552 ? Ss 0:00 /usr/sbin/vmware-authdlauncher
1779 ? S 0:00 -:0
1830 ? Ssl 0:00 /usr/sbin/console-kit-daemon --no-daemon
1906 ? Ss 0:00 /bin/sh /usr/bin/startkde
1993 ? Ss 0:00 /usr/bin/gpg-agent --sh --daemon
--write-env-file /home/user/.gnupg/agent.info /usr/bin/ssh-agent
/etc/X11/xinit/xinitrc
1994 ? Ss 0:00 /usr/bin/ssh-agent /etc/X11/xinit/xinitrc
2034 ? S 0:00 dbus-launch --sh-syntax --exit-with-session
2035 ? Ss 0:00 /bin/dbus-daemon --fork --print-pid 5
--print-address 7 --session
2042 ? S 0:00 /usr/lib64/kde4/libexec/start_kdeinit
+kcminit_startup
2043 ? Ss 0:00 kdeinit4: kdeinit4 Running...
2044 ? S 0:00 kdeinit4: klauncher [kdeinit] --fd=9
2046 ? Sl 0:00 kdeinit4: kded4 [kdeinit]
2053 ? S 0:00 kdeinit4: kglobalaccel [kdeinit]
2057 ? S 0:00 /usr/bin/kactivitymanagerd
2059 ? Sl 0:00 /usr/lib/upower/upowerd
2062 ? S 0:00 kwrapper4 ksmserver
2063 ? Sl 0:00 kdeinit4: ksmserver [kdeinit]
2067 ? S 0:00 kwin
2126 ? Sl 0:00 /usr/bin/knotify4
2138 ? Sl 0:00 /usr/lib/udisks/udisks-daemon
2140 ? S 0:00 udisks-daemon: not polling any devices
2147 ? Sl 0:03 kdeinit4: plasma-desktop [kdeinit]
2151 ? S 0:00 /usr/bin/kuiserver
2153 ? S 0:00 kdeinit4: kio_desktop [kdeinit] desktop
local:/tmp/ksocket-war
2159 ? S 0:00 kdeinit4: kio_file [kdeinit] file
local:/tmp/ksocket-user
2171 ? Sl 0:00 kdeinit4: krunner [kdeinit]
2196 ? Sl 0:00 /usr/bin/pulseaudio --start --log-target=syslog
2198 ? SNl 0:00 /usr/lib/rtkit/rtkit-daemon
2204 ? Sl 0:00 /usr/lib/tracker-store
2205 ? Sl 0:00
/usr/lib64/kde4/libexec/polkit-kde-authentication-agent-1
2207 ? Sl 0:00 kdeinit4: kmix [kdeinit]
2213 ? S 0:00 kdeinit4: klipper [kdeinit]
2216 ? S 0:00 /usr/lib/pulse/gconf-helper
2218 ? S 0:00 /usr/lib/GConf/2/gconfd-2
2223 ? Ssl 0:03 /home/user/.dropbox-dist/dropbox
2240 ? S 0:00 /usr/lib/gvfs/gvfsd
2245 ? Ssl 0:00 /usr/lib/gvfs//gvfs-fuse-daemon /home/user/.gvfs
2295 ? Rl 0:01 kdeinit4: konsole [kdeinit]
2298 pts/1 Ss 0:00 /bin/bash
2337 ? Sl 0:00 kdeinit4: kio_trash [kdeinit] trash
local:/tmp/ksocket-user
2367 ? Ssl 0:00 mpd
2388 ? R 1:30 [flush-253:5]
2437 pts/1 R+ 0:00 ps ax
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