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clocksource: Reduce the default clocksource_watchdog() retries to 2

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With the previous patch, there is an extra watchdog read in each retry.
Now the total number of clocksource reads is increased to 4 per iteration.
In order to avoid increasing the clock skew check overhead, the default
maximum number of retries is reduced from 3 to 2 to maintain the same 12
clocksource reads in the worst case.

Suggested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Waiman Long
2021-11-18 14:14:37 -05:00
committed by Paul E. McKenney
parent c86ff8c55b
commit 1a5620671a
2 changed files with 3 additions and 3 deletions
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kernel/time/clocksource.c
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@@ -199,7 +199,7 @@ void clocksource_mark_unstable(struct clocksource *cs)
spin_unlock_irqrestore(&watchdog_lock, flags);
}
ulong max_cswd_read_retries = 3;
ulong max_cswd_read_retries = 2;
module_param(max_cswd_read_retries, ulong, 0644);
EXPORT_SYMBOL_GPL(max_cswd_read_retries);
static int verify_n_cpus = 8;