Tejun Heo wrote: > Hello, > > cgroup currently only blocks new threads from joining the target > threadgroup during migration, and on-going migration could race > against exec and exit leading to interesting problems - the symmetry > between various attach methods, task exiting during method execution, > ->exit() racing against attach methods, migrating task switching basic > properties during exec and so on. > > This patchset extends threadgroup locking such that it covers all > operations which can alter the threadgroup - fork, exit and exec, and > update cgroup to take advantage of it. rwsem read ops are added to > exit path but exec is excluded by grabbing the existing > cred_guard_mutex from threadgroup locking helper. > > This makes threadgroup locking complete and resolves cgroup issues > stemming from the target taskset being unstable. > > This patchset is on top of the current pm-freezer + "freezer: fixes & > simplifications" patchset and contains the following four patches. > Patch list and diffstat follow. > > Thanks. > > [PATCH 1/4] cgroup: change locking order in attach_task_by_pid() > [PATCH 2/4] threadgroup: rename signal->threadgroup_fork_lock to > [PATCH 3/4] threadgroup: extend threadgroup_lock() to cover exit and > [PATCH 4/4] cgroup: always lock threadgroup during migration > I've read through the whole patchset, and it looks good to me. Acked-by: Li Zefan <lizf@xxxxxxxxxxxxxx> > include/linux/init_task.h | 9 ++---- > include/linux/sched.h | 58 ++++++++++++++++++++++++++++--------------- > kernel/cgroup.c | 62 +++++++++++++++++++++------------------------- > kernel/exit.c | 16 ++++++++--- > kernel/fork.c | 8 ++--- > 5 files changed, 88 insertions(+), 65 deletions(-) > > -- > tejun > > [1] http://thread.gmane.org/gmane.linux.kernel/1187553 > _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
