rcu-tasks: Count trylocks to estimate call_rcu_tasks() contention

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This commit converts the unconditional raw_spin_lock_rcu_node() lock
acquisition in call_rcu_tasks_generic() to a trylock followed by an
unconditional acquisition if the trylock fails.  If the trylock fails,
the failure is counted, but the count is reset to zero on each new jiffy.

This statistic will be used to determine when to move from a single
callback queue to per-CPU callback queues.

Reported-by: Martin Lau <kafai@fb.com>
Cc: Neeraj Upadhyay <neeraj.iitr10@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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This commit is contained in:

Paul E. McKenney 2021-11-22 13:38:42 -08:00

parent 8610b65680

commit 7d13d30bb6

1 changed files with 14 additions and 1 deletions

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kernel/rcu/tasks.h

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