rcu: Add CPU online/offline state to dump_blkd_tasks()

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Interactions between CPU-hotplug operations and grace-period
initialization can result in dump_blkd_tasks().  One of the first
debugging actions in this case is to search back in dmesg to work
out which of the affected rcu_node structure's CPUs are online and to
determine the last CPU-hotplug operation affecting any of those CPUs.
This can be laborious and error-prone, especially when console output
is lost.

This commit therefore causes dump_blkd_tasks() to dump the state of
the affected rcu_node structure's CPUs and the last grace period during
which the last offline and online operation affected each of these CPUs.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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This commit is contained in:

Paul E. McKenney 2018-05-08 14:18:57 -07:00

parent ff3cee3908

commit 5773894231

3 changed files with 39 additions and 10 deletions

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12

kernel/rcu/tree.c

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12

kernel/rcu/tree.h

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25

kernel/rcu/tree_plugin.h

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