Re: [PATCH] cgroup: Fix deadlock in cpu hotplug path
On Tue, Dec 19, 2017 at 12:56:57PM +0530, Prateek Sood wrote: > Deadlock during cgroup migration from cpu hotplug path when a task T is > being moved from source to destination cgroup. ... > Task T inserted a work item in the worklist of cpu0 low priority > worker pool. It is waiting for expedited grace period work item > to execute. This work item will only be executed once kworker/0:0 > complete execution of cpuset_hotplug_workfn(). > > kworker/0:0 ==> Task T ==>kworker/0:0 > > In case of PF_EXITING task being migrated from source to destination > cgroup, migrate next available task in source cgroup. > > Change-Id: I8874fb04479c136cae4dabd5c168c7749df4 > Signed-off-by: Prateek SoodApplied to cgroup/for-4.15-fixes. Thanks a lot, Prateek. -- tejun
Re: [PATCH] cgroup: Fix deadlock in cpu hotplug path
On Tue, Dec 19, 2017 at 12:56:57PM +0530, Prateek Sood wrote: > Deadlock during cgroup migration from cpu hotplug path when a task T is > being moved from source to destination cgroup. ... > Task T inserted a work item in the worklist of cpu0 low priority > worker pool. It is waiting for expedited grace period work item > to execute. This work item will only be executed once kworker/0:0 > complete execution of cpuset_hotplug_workfn(). > > kworker/0:0 ==> Task T ==>kworker/0:0 > > In case of PF_EXITING task being migrated from source to destination > cgroup, migrate next available task in source cgroup. > > Change-Id: I8874fb04479c136cae4dabd5c168c7749df4 > Signed-off-by: Prateek Sood Applied to cgroup/for-4.15-fixes. Thanks a lot, Prateek. -- tejun