rcu: Produce last "CleanupMore" trace only if late-breaking request
Currently Tree RCU's clean-up code emits a "CleanupMore" trace event in response to late-arriving grace-period requests even if the grace period was already requested. This makes "CleanupMore" show up an extra time (in addition to once for each rcu_node structure that was previously marked with the request), and for no good reason. This commit therefore avoids emitting this trace message unless the the only request for this next grace period arrived during or after the cleanup scan of the rcu_node structures. Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -2069,7 +2069,7 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
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rsp->gp_state = RCU_GP_IDLE;
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/* Check for GP requests since above loop. */
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rdp = this_cpu_ptr(rsp->rda);
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if (ULONG_CMP_LT(rnp->gp_seq, rnp->gp_seq_needed)) {
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if (!needgp && ULONG_CMP_LT(rnp->gp_seq, rnp->gp_seq_needed)) {
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trace_rcu_this_gp(rnp, rdp, rnp->gp_seq_needed,
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TPS("CleanupMore"));
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needgp = true;
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