linux-kernel - [PATCH v14 clocksource 6/6] clocksource: Print deviation in nanoseconds for unstable case

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Date:   Tue, 11 May 2021 16:34:55 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, john.stultz@...aro.org,
        sboyd@...nel.org, corbet@....net, Mark.Rutland@....com,
        maz@...nel.org, kernel-team@...com, neeraju@...eaurora.org,
        ak@...ux.intel.com, feng.tang@...el.com, zhengjun.xing@...el.com,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH v14 clocksource 6/6] clocksource: Print deviation in nanoseconds for unstable case

From: Feng Tang <feng.tang@...el.com>

Currently when an unstable clocksource is detected, the raw counters
of that clocksource and watchdog will be printed, which can only be
understood after some math calculation.  So print the existing delta in
nanoseconds to make it easier for humans to check the results.

Signed-off-by: Feng Tang <feng.tang@...el.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/time/clocksource.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index bbe1bcf44ffa..9c45b98e60e2 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -406,10 +406,10 @@ static void clocksource_watchdog(struct timer_list *unused)
 		if (abs(cs_nsec - wd_nsec) > md) {
 			pr_warn("timekeeping watchdog on CPU%d: Marking clocksource '%s' as unstable because the skew is too large:\n",
 				smp_processor_id(), cs->name);
-			pr_warn("                      '%s' wd_now: %llx wd_last: %llx mask: %llx\n",
-				watchdog->name, wdnow, wdlast, watchdog->mask);
-			pr_warn("                      '%s' cs_now: %llx cs_last: %llx mask: %llx\n",
-				cs->name, csnow, cslast, cs->mask);
+			pr_warn("                      '%s' wd_nesc: %lld wd_now: %llx wd_last: %llx mask: %llx\n",
+				watchdog->name, wd_nsec, wdnow, wdlast, watchdog->mask);
+			pr_warn("                      '%s' cs_nsec: %lld cs_now: %llx cs_last: %llx mask: %llx\n",
+				cs->name, cs_nsec, csnow, cslast, cs->mask);
 			if (curr_clocksource == cs)
 				pr_warn("                      '%s' is current clocksource.\n", cs->name);
 			else if (curr_clocksource)
-- 
2.31.1.189.g2e36527f23