linux-kernel - [tip: core/rcu] locktorture: Forgive apparent unfairness if CPU hotplug

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Date:   Tue, 24 Mar 2020 09:16:43 -0000
From:   "tip-bot2 for Paul E. McKenney" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Paul E. McKenney" <paulmck@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/rcu] locktorture: Forgive apparent unfairness if CPU hotplug

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     28e09a2e48486ce8ff0a72e21570d59b1243b308
Gitweb:        https://git.kernel.org/tip/28e09a2e48486ce8ff0a72e21570d59b1243b308
Author:        Paul E. McKenney <paulmck@...nel.org>
AuthorDate:    Thu, 30 Jan 2020 20:37:04 -08:00
Committer:     Paul E. McKenney <paulmck@...nel.org>
CommitterDate: Thu, 20 Feb 2020 15:59:59 -08:00

locktorture: Forgive apparent unfairness if CPU hotplug

If CPU hotplug testing is enabled, a lock might appear to be maximally
unfair just because one of the CPUs was offline almost all the time.
This commit therefore forgives unfairness if CPU hotplug testing was
enabled.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/locking/locktorture.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index 5baf904..5efbfc6 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -704,7 +704,8 @@ static void __torture_print_stats(char *page,
 	page += sprintf(page,
 			"%s:  Total: %lld  Max/Min: %ld/%ld %s  Fail: %d %s\n",
 			write ? "Writes" : "Reads ",
-			sum, max, min, max / 2 > min ? "???" : "",
+			sum, max, min,
+			!onoff_interval && max / 2 > min ? "???" : "",
 			fail, fail ? "!!!" : "");
 	if (fail)
 		atomic_inc(&cxt.n_lock_torture_errors);