Hi, v6 of a series of patches, originally authored by Mathieu, with the intent of fixing a long standing issue of SCHED_DEADLINE bandwidth accounting. As originally reported by Steve [1], when hotplug and/or (certain) cpuset reconfiguration operations take place, DEADLINE bandwidth accounting information is lost since root domains are destroyed and recreated. Mathieu's approach is based on restoring bandwidth accounting info on the newly created root domains by iterating through the (DEADLINE) tasks belonging to the configured cpuset(s). Apart from some minor refactoring needed to rebase the set on top of Waiman Long's cpuset for cgroup series (now mainline), two changes worth of notice: - added some more descriptive comments about why callback_lock gives the holder read-only access to cpusets [Steve] 04/05 - call cgroup_enable_task_cg_list if we need to traverse the list of tasks belonging to a particular cgroup (to rebuild its bandwidth), but such list is not yet ready (this can for example happen if CPUs are hotplugged during early boot stages) 05/05 Set also available at https://github.com/jlelli/linux.git fixes/deadline/root-domain-accounting-v6 Thanks, - Juri [1] https://lkml.org/lkml/2016/2/3/966 Juri Lelli (1): cgroup/cpuset: make callback_lock raw Mathieu Poirier (4): sched/topology: Adding function partition_sched_domains_locked() sched/core: Streamlining calls to task_rq_unlock() sched/core: Prevent race condition between cpuset and __sched_setscheduler() cpuset: Rebuild root domain deadline accounting information include/linux/cgroup.h | 1 + include/linux/cpuset.h | 6 ++ include/linux/sched.h | 5 ++ include/linux/sched/deadline.h | 8 ++ include/linux/sched/topology.h | 10 +++ kernel/cgroup/cgroup.c | 2 +- kernel/cgroup/cpuset.c | 159 +++++++++++++++++++++++++-------- kernel/sched/core.c | 34 ++++--- kernel/sched/deadline.c | 31 +++++++ kernel/sched/sched.h | 3 - kernel/sched/topology.c | 32 +++++-- 11 files changed, 234 insertions(+), 57 deletions(-) -- 2.17.2
