[RFC] [PATCH v2 0/2] cgroups: implement moving a threadgroup's threads atomically with cgroup.procs
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From: Ben Blum on 29 May 2010 22:00 This patch series is a revision of http://lkml.org/lkml/2010/1/3/51 and http://lkml.org/lkml/2010/1/3/52 . The rwsem in the fork path has been moved to signal_struct to simplify the locking code in the cgroup_attach_proc side. This depends on Oleg's recentish changes to signal_struct's lifetime rules (which don't seem to appear when I check out mmotm with git clone, so I wasn't able to do any more than basic testing). There is still a race with exec in the case where the threadgroup leader changes. To solve this, this implementation checks if the race occurred after all previous set-up has been done and all necessary locks are held, and if so, returns -EAGAIN which is handled by the calling function by looping until a different value is returned. -- bblum --- Documentation/cgroups/cgroups.txt | 9 include/linux/cgroup.h | 15 - include/linux/init_task.h | 9 include/linux/sched.h | 10 kernel/cgroup.c | 435 +++++++++++++++++++++++++++++++++----- kernel/fork.c | 10 6 files changed, 431 insertions(+), 57 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |