rcu: Add event tracing to ->gp_tasks update at GP start

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There is currently event tracing to track when a task is preempted
within a preemptible RCU read-side critical section, and also when that
task subsequently reaches its outermost rcu_read_unlock(), but none
indicating when a new grace period starts when that grace period must
wait on pre-existing readers that have been been preempted at least once
since the beginning of their current RCU read-side critical sections.

This commit therefore adds an event trace at grace-period start in
the case where there are such readers.  Note that only the first
reader in the list is traced.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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Paul E. McKenney 2017-06-19 10:32:23 -07:00

parent 7414fac050

commit c5ebe66ce7

1 changed files with 8 additions and 1 deletions

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kernel/rcu/tree_plugin.h

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