Tejun Heo bfc2cf6f61 cgroup: call subsys->*attach() only for subsystems which are actually affected by migration ... Currently, subsys->*attach() callbacks are called for all subsystems which are attached to the hierarchy on which the migration is taking place. With cgroup_migrate_prepare_dst() filtering out identity migrations, v1 hierarchies can avoid spurious ->*attach() callback invocations where the source and destination csses are identical; however, this isn't enough on v2 as only a subset of the attached controllers can be affected on controller enable/disable. While spurious ->*attach() invocations aren't critically broken, they're unnecessary overhead and can lead to temporary overcharges on certain controllers. Fix it by tracking which subsystems are affected by a migration and invoking ->*attach() callbacks only on those subsystems. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Zefan Li <lizefan@huawei.com>		2017-01-15 19:03:41 -05:00
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cgroup-internal.h	cgroup: call subsys->*attach() only for subsystems which are actually affected by migration	2017-01-15 19:03:41 -05:00
cgroup-v1.c	cgroup: call subsys->*attach() only for subsystems which are actually affected by migration	2017-01-15 19:03:41 -05:00
cgroup.c	cgroup: call subsys->*attach() only for subsystems which are actually affected by migration	2017-01-15 19:03:41 -05:00
cpuset.c	cgroup: move cgroup files under kernel/cgroup/	2016-12-27 14:49:05 -05:00
freezer.c	cgroup: move cgroup files under kernel/cgroup/	2016-12-27 14:49:05 -05:00
Makefile	cgroup: move namespace code to kernel/cgroup/namespace.c	2016-12-27 14:49:09 -05:00
namespace.c	cgroup: move namespace code to kernel/cgroup/namespace.c	2016-12-27 14:49:09 -05:00
pids.c	cgroup: move cgroup files under kernel/cgroup/	2016-12-27 14:49:05 -05:00