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rcu: Add kernel parameter to dump trace after RCU CPU stall warning

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This commit adds a rcu_cpu_stall_ftrace_dump kernel boot parameter, that,
when set, causes the trace buffer to be dumped after an RCU CPU stall
warning is printed.  This kernel boot parameter is disabled by default,
maintaining compatibility with previous behavior.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney
2019-06-13 15:30:49 -07:00
parent 1f3ebc8253
commit cdc694b235
4 changed files with 11 additions and 0 deletions
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4
kernel/rcu/tree_stall.h
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@@ -527,6 +527,8 @@ static void check_cpu_stall(struct rcu_data *rdp)
/* We haven't checked in, so go dump stack. */
print_cpu_stall();
if (rcu_cpu_stall_ftrace_dump)
rcu_ftrace_dump(DUMP_ALL);
} else if (rcu_gp_in_progress() &&
ULONG_CMP_GE(j, js + RCU_STALL_RAT_DELAY) &&
@@ -534,6 +536,8 @@ static void check_cpu_stall(struct rcu_data *rdp)
/* They had a few time units to dump stack, so complain. */
print_other_cpu_stall(gs2);
if (rcu_cpu_stall_ftrace_dump)
rcu_ftrace_dump(DUMP_ALL);
}
}