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rcutorture: Allow boottime stall warnings to be suppressed

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In normal production, an RCU CPU stall warning at boottime is often
just as bad as at any other time.  In fact, given the desire for fast
boot, any sort of long-term stall at boot is a bad idea.  However,
heavy rcutorture testing on large hyperthreaded systems can generate
boottime RCU CPU stalls as a matter of course.  This commit therefore
provides a kernel boot parameter that suppresses reporting of boottime
RCU CPU stall warnings and similarly of rcutorture writer stalls.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney
2019-12-05 11:29:01 -08:00
parent a59ee765a6
commit 58c53360b3
6 changed files with 35 additions and 6 deletions
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6
Documentation/admin-guide/kernel-parameters.txt
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@@ -4195,6 +4195,12 @@
rcupdate.rcu_cpu_stall_suppress= [KNL]
Suppress RCU CPU stall warning messages.
rcupdate.rcu_cpu_stall_suppress_at_boot= [KNL]
Suppress RCU CPU stall warning messages and
rcutorture writer stall warnings that occur
during early boot, that is, during the time
before the init task is spawned.
rcupdate.rcu_cpu_stall_timeout= [KNL]
Set timeout for RCU CPU stall warning messages.