Hello, On the v2 hierarchy, when controllers are enabled and disabled, other ->*attach() callbacks of other controllers are called spuriously with the same source and destination. While this isn't critical, it's a bit nasty and can lead to temporary double charging on certain controllers. This patchset fixes the issue.
This patchset contains the following three patches. 0001-cgroup-cosmetic-update-to-cgroup_taskset_add.patch 0002-cgroup-track-migration-context-in-cgroup_mgctx.patch 0003-cgroup-call-subsys-attach-only-for-subsystems-which-.patch 0001-0002 restructures migration context tracking so that extra state can be tracked easily. 0003 fixes the spurious ->*attach() invocations. This patchset is also available in the following git branch. git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-avoid-identity-attach diffstat follows. kernel/cgroup/cgroup-internal.h | 69 +++++++++++++++-- kernel/cgroup/cgroup-v1.c | 10 +- kernel/cgroup/cgroup.c | 161 ++++++++++++++++------------------------ 3 files changed, 135 insertions(+), 105 deletions(-) Thanks. -- tejun
