On Tuesday 16 of October 2012 15:28:39 Tejun Heo wrote: > Hello, > > This patchset updates cgroup_freezer so that > > * Unfreezable kernel tasks don't prevent a cgroup from transitioning > into FROZEN from FREEZING. There's nothing userland can do with or > about such tasks. > > * Tasks can be moved in and out of a frozen cgroup. Tasks are made to > conform to the state of the new cgroup during migration. This > behavior makes a lot more sense and removes the use of > ->can_attach() which makes co-mounting difficult. > > * Remove use of cgroup_lock_live_group(). Grabbing cgroup_lock from > outside cgroup proper creates a painful locking dependency and is > being phased out. With the above behavior change, removing > dependency on cgroup_lock is pretty easy. IMHO, it was simply the > wrong behavior to implement which forced the wrong implementation. > > This patchset contains the following seven patches. > > 0001-cgroup-cgroup_subsys-fork-should-be-called-after-the.patch > 0002-freezer-add-missing-mb-s-to-freezer_count-and-freeze.patch > 0003-cgroup_freezer-make-it-official-that-writes-to-freez.patch > 0004-cgroup_freezer-don-t-stall-transition-to-FROZEN-for-.patch > 0005-cgroup_freezer-allow-moving-tasks-in-and-out-of-a-fr.patch > 0006-cgroup_freezer-prepare-update_if_frozen-for-locking-.patch > 0007-cgroup_freezer-don-t-use-cgroup_lock_live_group.patch > > 0001 is a fix for a rather embarrassing bug in cgroup core. It does > things in the wrong order leaving a window for racing during fork. > > 0002 adds a missing mb() around freezing condition updates / checks. > > 0003-0004 make cgroup_freezer ignore unfreezable kernel tasks and > handle PF_FREEZER_SKIP correctly. > > 0005 allows migrating tasks in and out of a frozen cgroup. > > 0006-0007 remove the use of cgroup_lock_live_group(). > > This patchset is on top of v3.7-rc1 and available in the following git > branch. > > git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git > review-cgroup_freezer-locking
It seems that no one has any comments. :-) Are you going to prepare a branch for me to pull from? Rafael -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
