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rcu: Add sysrq rcu_node-dump capability

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Life is hard if RCU manages to get stuck without triggering RCU CPU
stall warnings or triggering the rcu_check_gp_start_stall() checks
for failing to start a grace period.  This commit therefore adds a
boot-time-selectable sysrq key (commandeering "y") that allows manually
dumping Tree RCU state.  The new rcutree.sysrq_rcu kernel boot parameter
must be set for this sysrq to be available.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney
2018-12-12 12:32:06 -08:00
parent 3b6505fd8e
commit 2ccaff10f7
2 changed files with 30 additions and 0 deletions
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5
Documentation/admin-guide/kernel-parameters.txt
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@@ -3721,6 +3721,11 @@
This wake_up() will be accompanied by a
WARN_ONCE() splat and an ftrace_dump().
rcutree.sysrq_rcu= [KNL]
Commandeer a sysrq key to dump out Tree RCU's
rcu_node tree with an eye towards determining
why a new grace period has not yet started.
rcuperf.gp_async= [KNL]
Measure performance of asynchronous
grace-period primitives such as call_rcu().