Messages in this thread | | | From | Zqiang <> | Subject | [PATCH v3 0/2] rcu: Deoffload rdp if rcuop/rcuog kthreads spawn failed | Date | Fri, 18 Mar 2022 16:07:17 +0800 |
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When CONFIG_RCU_NOCB_CPU is enabled and 'rcu_nocbs' is set, the rcuop and rcuog kthreads is created. however the rcuop or rcuog kthreads creation may fail, if failed, deoffload the offloaded rdp.
--- v1->v2: Invert the locking dependency order between rcu_state.barrier_mutex and hotplug lock.
Holding nocb_gp_kthread_mutex, ensure that the nocb_gp_kthread exists.
v2->v3: Adjust the position of the nocb_gp_kthread_mutex, in rdp_gp->nocb_gp_kthread check upper lock nocb_gp_kthread_mutex.
Do the locking order change in a separate patch.
Zqiang(2): rcu: Call rcu_nocb_rdp_deoffload() directly after rcuog/op kthreads spawn failed rcu: Invert the locking dependency order between rcu_state.barrier_mutex and hotplug lock
kernel/rcu/tree_nocb.h | 83 ++++++++++++++++++++++++++++++++---------- 1 file changed, 63 insertions(+), 20 deletions(-)
-- 2.25.1
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