linux-kernel - [PATCH tip/core/rcu 11/17] torture: Make refscale throttle high-rate printk()s

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Date:   Wed,  6 Jan 2021 09:17:04 -0800
From:   paulmck@...nel.org
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH tip/core/rcu 11/17] torture: Make refscale throttle high-rate printk()s

From: "Paul E. McKenney" <paulmck@...nel.org>

This commit adds a short delay for verbose_batched-throttled printk()s
to further decrease console flooding.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/refscale.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index 3da246f..02dd976 100644
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -52,8 +52,10 @@ static atomic_t verbose_batch_ctr;
 do {											\
 	if (verbose &&									\
 	    (verbose_batched <= 0 ||							\
-	     !(atomic_inc_return(&verbose_batch_ctr) % verbose_batched)))		\
+	     !(atomic_inc_return(&verbose_batch_ctr) % verbose_batched))) {		\
+		schedule_timeout_uninterruptible(1);					\
 		pr_alert("%s" SCALE_FLAG s, scale_type, ## x);				\
+	}										\
 } while (0)
 
 #define VERBOSE_SCALEOUT_ERRSTRING(s, x...) \
-- 
2.9.5