Public bug reported:
libvirtd is polling /etc/modprobe.d every second with opendir() ..
closedir() calls:
fatrace reports:
libvirtd(1405): O /etc/modprobe.d
libvirtd(1405): C /etc/modprobe.d
libvirtd(1405): O /etc/modprobe.d
libvirtd(1405): C /etc/modprobe.d
libvirtd(1405): O /etc/modprobe.d
libvirtd(1405): C /etc/modprobe.d
libvirtd(1405): O /etc/modprobe.d
libvirtd(1405): C /etc/modprobe.d
libvirtd(1405): O /etc/modprobe.d
libvirtd(1405): C /etc/modprobe.d
libvirtd(1405): CO /etc/modprobe.d
libvirtd(1405): O /etc/modprobe.d
libvirtd(1405): C /etc/modprobe.d
libvirtd(1405): O /etc/modprobe.d
libvirtd(1405): C /etc/modprobe.d
libvirtd(1405): CO /etc/modprobe.d
debugging this a bit deeper:
Breakpoint 6, __opendir (name=0x7f668f1af1a0 "/sys/class/net") at
../sysdeps/posix/opendir.c:158
158 ../sysdeps/posix/opendir.c: No such file or directory.
(gdb) where
#0 __opendir (name=0x7f668f1af1a0 "/sys/class/net") at
../sysdeps/posix/opendir.c:158
#1 0x00007f6694c1a75c in glob_in_dir (pattern=pattern@entry=0x7f668f1af45f
"*",
directory=directory@entry=0x7f668f1af1a0 "/sys/class/net",
flags=flags@entry=8196,
errfunc=errfunc@entry=0x0, pglob=pglob@entry=0x7f668f1af550,
alloca_used=560, alloca_used@entry=32)
at ../posix/glob.c:1541
#2 0x00007f6694c1bf1c in __GI_glob (pattern=pattern@entry=0x7f668f1af450
"/sys/class/net/*",
flags=flags@entry=8196, errfunc=errfunc@entry=0x0,
pglob=pglob@entry=0x7f668f1af550)
at ../posix/glob.c:1192
#3 0x00007f6694c1b4b5 in __GI_glob (pattern=0x7f667000a970
"/sys/class/net/*/address",
flags=<optimised out>, errfunc=0x0, pglob=<optimised out>) at
../posix/glob.c:1050
#4 0x00007f6687af1328 in ?? () from /usr/lib/libaugeas.so.0
#5 0x00007f6687af2fc0 in ?? () from /usr/lib/libaugeas.so.0
#6 0x00007f6687ac6e7e in aug_load () from /usr/lib/libaugeas.so.0
#7 0x00007f6687d27af0 in ?? () from /usr/lib/libnetcf.so.1
#8 0x00007f6687d281ce in ?? () from /usr/lib/libnetcf.so.1
#9 0x00007f6687d29dd7 in ?? () from /usr/lib/libnetcf.so.1
#10 0x00007f6687f3889c in ?? () from
/usr/lib/libvirt/connection-driver/libvirt_driver_interface.so
#11 0x00007f669525de6c in virConnectNumOfInterfaces () from
/usr/lib/libvirt.so.0
#12 0x0000000000421ad7 in ?? ()
#13 0x00007f66952b4a62 in virNetServerProgramDispatch () from
/usr/lib/libvirt.so.0
#14 0x00007f66952aecd8 in ?? () from /usr/lib/libvirt.so.0
#15 0x00007f66951c852e in ?? () from /usr/lib/libvirt.so.0
#16 0x00007f66951c7be6 in ?? () from /usr/lib/libvirt.so.0
#17 0x00007f6694f26f8e in start_thread (arg=0x7f668f1b0700) at
pthread_create.c:311
#18 0x00007f6694c50e1d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:113
so it appears be be kicked off from virConnectNumOfInterfaces
(libvirt.c) probable from:
ret = conn->interfaceDriver->numOfInterfaces(conn);
This seems to me to be unneccessary polling and directory read overhead.
** Affects: ubuntu-power-consumption
Importance: Undecided
Status: New
** Affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
** Also affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1164414
Title:
libvirtd polling /etc/modprobe.d every second
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