linux-kernel - [PATCH rcu 08/13] rcuscale: Print grace-period kthread CPU time, if recorded

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230717181138.1098063-8-paulmck@kernel.org>
Date:   Mon, 17 Jul 2023 11:11:33 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...a.com,
        rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 08/13] rcuscale: Print grace-period kthread CPU time, if recorded

This commit prints out the CPU time consumed by the grace-period kthread,
if the specified RCU flavor supports this notion.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 .../selftests/rcutorture/bin/kvm-recheck-rcuscale.sh      | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuscale.sh b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuscale.sh
index b582113178ac..f683e424ddd5 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuscale.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuscale.sh
@@ -40,6 +40,10 @@ awk '
 	sum += $5 / 1000.;
 }
 
+/rcu_scale: Grace-period kthread CPU time/ {
+	cputime = $6;
+}
+
 END {
 	newNR = asort(gptimes);
 	if (newNR <= 0) {
@@ -78,6 +82,8 @@ END {
 	print "90th percentile grace-period duration: " gptimes[pct90];
 	print "99th percentile grace-period duration: " gptimes[pct99];
 	print "Maximum grace-period duration: " gptimes[newNR];
-	print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches;
+	if (cputime != "")
+		cpustr = " CPU: " cputime;
+	print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches cpustr;
 	print "Computed from rcuscale printk output.";
 }'
-- 
2.40.1