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rcu: Add a trace event for synchronize_rcu_normal()

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Add an rcu_sr_normal() trace event. It takes three arguments
first one is the name of RCU flavour, second one is a user id
which triggeres synchronize_rcu_normal() and last one is an
event.

There are two traces in the synchronize_rcu_normal(). On entry,
when a new request is registered and on exit point when request
is completed.

Please note, CONFIG_RCU_TRACE=y is required to activate traces.

Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit is contained in:
Uladzislau Rezki (Sony)
2024-03-08 18:34:06 +01:00
parent 988f569ae0
commit 2053937a31
2 changed files with 33 additions and 1 deletions
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7
kernel/rcu/tree.c
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@@ -3863,9 +3863,11 @@ static void synchronize_rcu_normal(void)
{
struct rcu_synchronize rs;
trace_rcu_sr_normal(rcu_state.name, &rs.head, TPS("request"));
if (!READ_ONCE(rcu_normal_wake_from_gp)) {
wait_rcu_gp(call_rcu_hurry);
return;
goto trace_complete_out;
}
init_rcu_head_on_stack(&rs.head);
@@ -3886,6 +3888,9 @@ static void synchronize_rcu_normal(void)
/* Now we can wait. */
wait_for_completion(&rs.completion);
destroy_rcu_head_on_stack(&rs.head);
trace_complete_out:
trace_rcu_sr_normal(rcu_state.name, &rs.head, TPS("complete"));
}
/**