diff options
| author | Paul E. McKenney <paulmck@kernel.org> | 2019-12-05 11:29:01 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-02-20 16:03:30 -0800 |
| commit | 58c53360b36d2077cbb843e7ad2bf75f0498271c (patch) | |
| tree | f323d4850bdf31fd078e6a654ebb60cf50e9fd82 /kernel/rcu/update.c | |
| parent | a59ee765a6890e7f4281070008a2654337458311 (diff) | |
rcutorture: Allow boottime stall warnings to be suppressed
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>
Diffstat (limited to 'kernel/rcu/update.c')
| -rw-r--r-- | kernel/rcu/update.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index feaaec5747a3..085f08a898fe 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -476,13 +476,19 @@ EXPORT_SYMBOL_GPL(rcutorture_sched_setaffinity); #ifdef CONFIG_RCU_STALL_COMMON int rcu_cpu_stall_ftrace_dump __read_mostly; module_param(rcu_cpu_stall_ftrace_dump, int, 0644); -int rcu_cpu_stall_suppress __read_mostly; /* 1 = suppress stall warnings. */ +int rcu_cpu_stall_suppress __read_mostly; // !0 = suppress stall warnings. EXPORT_SYMBOL_GPL(rcu_cpu_stall_suppress); module_param(rcu_cpu_stall_suppress, int, 0644); int rcu_cpu_stall_timeout __read_mostly = CONFIG_RCU_CPU_STALL_TIMEOUT; module_param(rcu_cpu_stall_timeout, int, 0644); #endif /* #ifdef CONFIG_RCU_STALL_COMMON */ +// Suppress boot-time RCU CPU stall warnings and rcutorture writer stall +// warnings. Also used by rcutorture even if stall warnings are excluded. +int rcu_cpu_stall_suppress_at_boot __read_mostly; // !0 = suppress boot stalls. +EXPORT_SYMBOL_GPL(rcu_cpu_stall_suppress_at_boot); +module_param(rcu_cpu_stall_suppress_at_boot, int, 0444); + #ifdef CONFIG_TASKS_RCU /* |