Messages in this thread Patch in this message | | | From | "Joel Fernandes (Google)" <> | Subject | [PATCH 6/6] rcu: Add comment to rcu_do_batch() identifying rcuoc code path | Date | Wed, 15 Mar 2023 19:38:51 +0000 |
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From: "Paul E. McKenney" <paulmck@kernel.org>
This commit adds a comment to help explain why the "else" clause of the in_serving_softirq() "if" statement does not need to enforce a time limit. The reason is that this "else" clause handles rcuoc kthreads that do not block handlers for other softirq vectors.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> --- kernel/rcu/tree.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 8e880c09ab59..06cc6a6ad819 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2131,6 +2131,8 @@ static void rcu_do_batch(struct rcu_data *rdp) break; } } else { + // In rcuoc context, so no worries about depriving + // other softirq vectors of CPU cycles. local_bh_enable(); lockdep_assert_irqs_enabled(); cond_resched_tasks_rcu_qs(); -- 2.40.0.rc1.284.g88254d51c5-goog
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