rcu: Make TASKS_RCU handle nohz_full= CPUs

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Currently TASKS_RCU would ignore a CPU running a task in nohz_full=
usermode execution.  There would be neither a context switch nor a
scheduling-clock interrupt to tell TASKS_RCU that the task in question
had passed through a quiescent state.  The grace period would therefore
extend indefinitely.  This commit therefore makes RCU's dyntick-idle
subsystem record the task_struct structure of the task that is running
in dyntick-idle mode on each CPU.  The TASKS_RCU grace period can
then access this information and record a quiescent state on
behalf of any CPU running in dyntick-idle usermode.

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

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This commit is contained in:

Paul E. McKenney 2014-08-04 17:43:50 -07:00

parent 84a8f446ff

commit 176f8f7a52

6 changed files with 27 additions and 2 deletions

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3

include/linux/init_task.h

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2

include/linux/sched.h

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2

kernel/rcu/tree.c

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2

kernel/rcu/tree.h

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16

kernel/rcu/tree_plugin.h

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4

kernel/rcu/update.c

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