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This bug was fixed in the package systemd - 223-1ubuntu1

---------------
systemd (223-1ubuntu1) wily; urgency=medium

  * Merge with Debian unstable. Remaining Ubuntu changes:
    - Hack to support system-image read-only /etc, and modify files in
      /etc/writable/ instead.
    - Keep our much simpler udev maintainer scripts (all platforms must
      support udev, no debconf).
    - initramfs init-bottom: If LVM is installed, settle udev,
      otherwise we get missing LV symlinks. Workaround for LP #1185394.
    - Add debian/udev.lvm2.init: Dummy SysV init script to satisfy insserv
      dependencies to "lvm2" which is handled with udev rules in Ubuntu.
    - Add debian/udev.lvm2.service to avoid running the dummy lvm2 init
      script.
    - Provide shutdown fallback for upstart. (LP: #1370329)
    - debian/extra/ifup@.service: Additionally run for "auto" class. We don't
      really support "allow-hotplug" in Ubuntu at the moment, so we need to
      deal with "auto" devices appearing after "/etc/init.d/networking start"
      already ran. (LP: #1374521)
    - ifup@.service: Drop dependency on networking.service (i. e.
      /etc/init.d/networking), and merely ensure that /run/network exists.
      This avoids unnecessary dependencies/waiting during boot and dependency
      cycles if hooks wait for other interfaces to come up (like ifenslave
      with bonding interfaces). (LP: #1414544)
    - Add Get-RTC-is-in-local-time-setting-from-etc-default-rc.patch: In
      Ubuntu we currently keep the setting whether the RTC is in local or UTC
      time in /etc/default/rcS "UTC=yes|no", instead of /etc/adjtime.
      (LP: #1377258)
    - Put session scopes into all cgroup controllers. This makes unprivileged
      user LXC containers work under systemd. (LP: #1346734)
    - systemctl: Don't forward telinit u to upstart. This works around
      upstart's Restart() always reexec'ing /sbin/init on Restart(), even if
      that changes to point to systemd during the upgrade. This avoids running
      systemd during a dist-upgrade. (LP: #1430479)
    - Drop hwdb-update dependency from udev-trigger.service, which got
      introduced in v219-stable. This causes udev and plymouth to start too
      late and isn't really needed in Ubuntu yet as we don't support stateless
      systems yet and handle hwdb.bin updates through dpkg triggers. This can
      be dropped again with initramfs-tools 0.117.
    - Lower Breaks: to plymouth version which has the udev inotify fix in
      Ubuntu.
    - Lower apparmor Breaks: to the Ubuntu version that dropped $remote_fs.
    - Change systemd-sysv's conflicts to upstart-sysv. (LP: #1422681)

    Upgrade fixes, keep until 16.04 LTS release:
    - systemd Conflicts/Replaces/Provides systemd-services.
    - Remove obsolete systemd-logind upstart job.
    - Clean up obsolete /etc/udev/rules.d/README.
    - systemd.postinst: Migrate mountall specific fstab options to standard
      util-linux "nofail" option.

systemd (223-3) UNRELEASED; urgency=medium

  * boot-and-services autopkgtest: Ignore thermald. Since 1.4.3-2 it starts by
    default, but fails in most virtual envs.

systemd (223-2) unstable; urgency=medium

  * Don't enable gnu-efi on ARM. It FTBFSes and cannot really be tested now as
    there is no available hardware.
  * debian/extra/initramfs-tools/hooks/udev: Don't fail if
    /etc/systemd/network/ does not exist. (Closes: #794050)

systemd (223-1) unstable; urgency=medium

  * New upstream release:
    - Fix systemd-bootchart crash. (Closes: #792403)
    - Trim list of files in /usr/share/doc/systemd/. (Closes: #791839)
    - Fix "Invalid argument" failure with some  journal files.
      (Closes: #792090)
    - tmpfiles: Don't recursively descend into journal directories in /var.
      (Closes: #791897)
    - Don't frequently wake up on disabled TimeoutIdleSec=, in particular in
      automount timers. (LP: #1470845)
    - tmpfiles: Don't delete lost+found/. (Closes: #788193)

  [ Michael Biebl ]
  * udev: Remove obsolete rm_conffile/mv_conffile functions from udev.preinst.
    The udev package is using dpkg-maintscripts-helper now to remove obsolete
    conffiles.
  * systemd: Remove obsolete conffile clean up from pre-wheezy.
  * udev-udeb: Remove scsi_wait_scan hack from the start-udev script as well.

  [ Martin Pitt ]
  * Enable GNU EFI support and add gnu-efi build dep. This enables/ships the
    systemd EFI boot loader. (Closes: #787720, LP: #1472283)
  * networkd autopkgtest: More robust/forceful killing of dnsmasq.
  * ifup@.service: Drop "oneshot" to run ifup in the background during boot.
    This avoids blocking network.target on boot with unavailable hotplug
    interfaces in /etc/network/interfaces. (Closes: #790669, LP: #1425376)
  * systemd.postinst: Avoid confusing error message about
    /run/systemd/was-enabled not existing on reconfiguring.
  * debian/extra/initramfs-tools/hooks/udev: Drop some redundant code.
  * Fix networkd-wait-online -i to properly wait for the given interfaces
    only.
  * Drop debian/extra/base-installer.d/05udev: We use net.ifnames by default
    now, thus we don't need to copy 70-persistent-*.rules any more.
  * debian/extra/start-udev: Run d-i's udevd with "notice" log level, just
    like we did in the initramfs in 219-10.
  * Fix size explosion of networkd (post-223 patch from trunk).

  [ Julian Wollrath ]
  * Copy all .link interface naming definitions to initramfs. (Closes: #793374)

  [ Felipe Sateler ]
  * nss-my*.postinst: configure at the end of the hosts line, not before
    files. (Closes: #789006)

 -- Martin Pitt <martin.pitt@xxxxxxxxxx>  Fri, 31 Jul 2015 07:38:04
+0200

** Changed in: systemd (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1470845

Title:
  wakes up from automount-expire timer every second

Status in systemd package in Ubuntu:
  Fix Released

Bug description:
  I noticed that systemd on my idle Wily desktop is creating very short
  lived threads at 1Hz.  While these aren't doing much, it still
  consumes power doing wakeups to create these periodic threads.

  Showing thread creation with forkstat:

  $ sudo forkstat 
  Time     Event  PID  Info  Duration Process
  13:43:07 clone     1 parent          /sbin/init splash
  13:43:07 clone  7483 thread          /sbin/init splash
  13:43:07 exit   7483      0    0.001 /sbin/init splash
  13:43:08 clone     1 parent          /sbin/init splash
  13:43:08 clone  7484 thread          /sbin/init splash
  13:43:08 exit   7484      0    0.000 /sbin/init splash
  13:43:10 clone     1 parent          /sbin/init splash
  13:43:10 clone  7485 thread          /sbin/init splash
  13:43:10 exit   7485      0    0.000 /sbin/init splash
  13:43:11 clone     1 parent          /sbin/init splash
  13:43:11 clone  7486 thread          /sbin/init splash
  13:43:11 exit   7486      0    0.000 /sbin/init splash
  13:43:12 clone     1 parent          /sbin/init splash
  13:43:12 clone  7487 thread          /sbin/init splash
  13:43:12 exit   7487      0    0.000 /sbin/init splash
  13:43:13 clone     1 parent          /sbin/init splash
  13:43:13 clone  7488 thread          /sbin/init splash
  13:43:13 exit   7488      0    0.000 /sbin/init splash
  13:43:15 clone     1 parent          /sbin/init splash
  13:43:15 clone  7489 thread          /sbin/init splash
  13:43:15 exit   7489      0    0.000 /sbin/init splash
  13:43:16 clone     1 parent          /sbin/init splash
  13:43:16 clone  7490 thread          /sbin/init splash
  13:43:16 exit   7490      0    0.000 /sbin/init splash
  13:43:17 clone     1 parent          /sbin/init splash
  13:43:17 clone  7491 thread          /sbin/init splash
  13:43:17 exit   7491      0    0.000 /sbin/init splash

  And it's consuming some cycles over time:

  $ sudo perf stat -p 1
  ^C
   Performance counter stats for process id '1':

            7.519868      task-clock (msec)         #    0.000 CPUs utilized          
                  41      context-switches          #    0.005 M/sec                  
                  39      cpu-migrations            #    0.005 M/sec                  
                   3      page-faults               #    0.399 K/sec                  
          12,107,977      cycles                    #    1.610 GHz                    
          10,597,101      stalled-cycles-frontend   #   87.52% frontend cycles idle   
                   0      stalled-cycles-backend    #    0.00% backend  cycles idle   
           2,285,818      instructions              #    0.19  insns per cycle        
                                                    #    4.64  stalled cycles per insn
             457,133      branches                  #   60.790 M/sec                  
              69,444      branch-misses             #   15.19% of all branches        

        46.099593011 seconds time elapsed

  The thread is just doing the following:

  clock_gettime(0x7 /* CLOCK_??? */, {52592, 947682919}) = 0
  read(14, "\1\0\0\0\0\0\0\0", 8)         = 8
  fcntl(30, F_DUPFD_CLOEXEC, 3)           = 15
  ioctl(30, 0xc0189374, 0x7ffeaf311470)   = 0
  fcntl(16, F_GETFD)                      = 0x1 (flags FD_CLOEXEC)
  clone(Process 7466 attached
  child_stack=0x7f97c3580e30, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f97c35819d0, tls=0x7f97c3581700, child_tidptr=0x7f97c35819d0) = 7466
  [pid  7466] set_robust_list(0x7f97c35819e0, 24) = 0
  [pid     1] timerfd_settime(14, TFD_TIMER_ABSTIME, {it_interval={0, 0}, it_value={52594, 197493000}}, NULL <unfinished ...>
  [pid  7466] ioctl(15, 0xc018937c <unfinished ...>
  [pid     1] <... timerfd_settime resumed> ) = 0
  [pid  7466] <... ioctl resumed> , 0x7f97c3580d60) = -1 EAGAIN (Resource temporarily unavailable)
  [pid     1] epoll_wait(4,  <unfinished ...>
  [pid  7466] close(15)                   = 0
  [pid  7466] close(16)                   = 0
  [pid  7466] madvise(0x7f97c2d81000, 8368128, MADV_DONTNEED) = 0
  [pid  7466] _exit(0)                    = ?
  [pid  7466] +++ exited with 0 +++
  <... epoll_wait resumed> {{EPOLLIN, {u32=3, u64=3}}}, 34, -1) = 1

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