1. 25 11月, 2011 1 次提交
    • M
      cgroup_freezer: fix freezing groups with stopped tasks · 884a45d9
      Michal Hocko 提交于
      2d3cbf8b (cgroup_freezer: update_freezer_state() does incorrect state
      transitions) removed is_task_frozen_enough and replaced it with a simple
      frozen call. This, however, breaks freezing for a group with stopped tasks
      because those cannot be frozen and so the group remains in CGROUP_FREEZING
      state (update_if_frozen doesn't count stopped tasks) and never reaches
      CGROUP_FROZEN.
      
      Let's add is_task_frozen_enough back and use it at the original locations
      (update_if_frozen and try_to_freeze_cgroup). Semantically we consider
      stopped tasks as frozen enough so we should consider both cases when
      testing frozen tasks.
      
      Testcase:
      mkdir /dev/freezer
      mount -t cgroup -o freezer none /dev/freezer
      mkdir /dev/freezer/foo
      sleep 1h &
      pid=$!
      kill -STOP $pid
      echo $pid > /dev/freezer/foo/tasks
      echo FROZEN > /dev/freezer/foo/freezer.state
      while true
      do
      	cat /dev/freezer/foo/freezer.state
      	[ "`cat /dev/freezer/foo/freezer.state`" = "FROZEN" ] && break
      	sleep 1
      done
      echo OK
      Signed-off-by: NMichal Hocko <mhocko@suse.cz>
      Acked-by: NLi Zefan <lizf@cn.fujitsu.com>
      Cc: Tomasz Buchert <tomasz.buchert@inria.fr>
      Cc: Paul Menage <paul@paulmenage.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: stable@kernel.org
      Signed-off-by: NTejun Heo <htejun@gmail.com>
      884a45d9
  2. 19 11月, 2011 1 次提交
  3. 18 11月, 2011 9 次提交
  4. 17 11月, 2011 20 次提交
  5. 16 11月, 2011 9 次提交