diff options
| author | Zqiang <qiang1.zhang@intel.com> | 2022-01-25 10:47:44 +0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-02-01 17:22:17 -0800 |
| commit | c9515875850fefcc79492c5189fe8431e75ddec5 (patch) | |
| tree | c5dd3fe74246dfa81fb8f08df014b26ee7ba3aad /kernel/rcu/tree.h | |
| parent | 10c535787436d62ea28156a4b91365fd89b5a432 (diff) | |
rcu: Add per-CPU rcuc task dumps to RCU CPU stall warnings
When the rcutree.use_softirq kernel boot parameter is set to zero, all
RCU_SOFTIRQ processing is carried out by the per-CPU rcuc kthreads.
If these kthreads are being starved, quiescent states will not be
reported, which in turn means that the grace period will not end, which
can in turn trigger RCU CPU stall warnings. This commit therefore dumps
stack traces of stalled CPUs' rcuc kthreads, which can help identify
what is preventing those kthreads from running.
Suggested-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Reviewed-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree.h')
| -rw-r--r-- | kernel/rcu/tree.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index e9990945483f..b84cc5742c31 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -239,6 +239,7 @@ struct rcu_data { /* rcuc per-CPU kthread or NULL. */ unsigned int rcu_cpu_kthread_status; char rcu_cpu_has_work; + unsigned long rcuc_activity; /* 7) Diagnostic data, including RCU CPU stall warnings. */ unsigned int softirq_snap; /* Snapshot of softirq activity. */ |