linux-kernel - [tip: timers/core] clocksource: Print deviation in nanoseconds when a clocksource becomes unstable

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Date:   Tue, 22 Jun 2021 14:58:36 -0000
From:   "tip-bot2 for Feng Tang" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Feng Tang <feng.tang@...el.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: timers/core] clocksource: Print deviation in nanoseconds when a
 clocksource becomes unstable

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

Commit-ID:     22a22383371667962b46bd90d534cc57669537ac
Gitweb:        https://git.kernel.org/tip/22a22383371667962b46bd90d534cc57669537ac
Author:        Feng Tang <feng.tang@...el.com>
AuthorDate:    Thu, 27 May 2021 12:01:24 -07:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 22 Jun 2021 16:53:17 +02:00

clocksource: Print deviation in nanoseconds when a clocksource becomes unstable

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 delta in nanoseconds as well to make it easier for humans to
check the results.

[ paulmck: Fix typo. ]

Signed-off-by: Feng Tang <feng.tang@...el.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20210527190124.440372-6-paulmck@kernel.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 74d6a23..b89c76e 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -407,10 +407,10 @@ 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_nsec: %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)