Hi, v7 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 the usual rebase on top of cgroup/for-next, changes worth of notice are: - commented about potential problems w.r.t. userspace operations that grabs callback_lock (03/07 - peterz) - take cpuset_read_only_lock() before rq an pi locks, as to not introduce a dependency between the former and the latters; on !CONFIG_ CPUSET cpuset_read_only(un)lock() (dis/en)ables irqs and preemption (04/07 - peterz) - make dl_add_task_root_domain() use !_irqsave (un)lock functions - also use __dl_add() to update root domain total_bw - 06/07 new patch; seq_show operations can be guarded by cpuset_mutex (peterz) - 07/07 new patch; deals with offline migrations (noticed the problem while testing) Set also available at https://github.com/jlelli/linux.git fixes/deadline/root-domain-accounting-v7 Thanks, - Juri [1] https://lkml.org/lkml/2016/2/3/966 Juri Lelli (5): cgroup/cpuset: make callback_lock raw sched/core: Prevent race condition between cpuset and __sched_setscheduler() cpuset: Rebuild root domain deadline accounting information cgroup/cpuset: Use cpuset_mutex to protect seq_show operations sched/deadline: Fix bandwidth accounting at all levels after offline migration Mathieu Poirier (2): sched/topology: Adding function partition_sched_domains_locked() sched/core: Streamlining calls to task_rq_unlock() include/linux/cgroup.h | 1 + include/linux/cpuset.h | 14 +++ 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 | 161 +++++++++++++++++++++++++-------- kernel/sched/core.c | 49 +++++++--- kernel/sched/deadline.c | 63 +++++++++++++ kernel/sched/sched.h | 3 - kernel/sched/topology.c | 30 +++++- 11 files changed, 286 insertions(+), 60 deletions(-) -- 2.17.2
