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| author | Paul E. McKenney <paulmck@kernel.org> | 2024-02-18 09:11:08 -0800 |
|---|---|---|
| committer | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2024-04-09 15:10:13 +0200 |
| commit | f8039457eedc378fa7a186054ee3032b8a41eaee (patch) | |
| tree | 21dcd8118a2338292fb1a918059f5ea47405cc00 /kernel/rcu | |
| parent | 0a0467af0a4d8b4e3832945d1cc287d1cb52573e (diff) | |
| download | linux-f8039457eedc378fa7a186054ee3032b8a41eaee.tar.gz linux-f8039457eedc378fa7a186054ee3032b8a41eaee.tar.bz2 linux-f8039457eedc378fa7a186054ee3032b8a41eaee.zip | |
rcutorture: Dump GP kthread state on insufficient cb-flood laundering
If a callback flood prevents grace period from completing, rcutorture
does a WARN_ON(). Avoiding this WARN_ON() currently requires that at
least three grace periods elapse during an eight-second callback-flood
interval. Unfortunately, the current debug information does not include
anything about the grace-period state. This commit therefore adds a
call to cur_ops->gp_kthread_dbg(), if this function pointer is non-NULL.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/rcutorture.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 6611ef3e71c3..eff51a26216f 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -2832,7 +2832,8 @@ static void rcu_torture_fwd_prog_cr(struct rcu_fwd *rfp) if (!torture_must_stop() && !READ_ONCE(rcu_fwd_emergency_stop) && !shutdown_time_arrived()) { - WARN_ON(n_max_gps < MIN_FWD_CBS_LAUNDERED); + if (WARN_ON(n_max_gps < MIN_FWD_CBS_LAUNDERED) && cur_ops->gp_kthread_dbg) + cur_ops->gp_kthread_dbg(); pr_alert("%s Duration %lu barrier: %lu pending %ld n_launders: %ld n_launders_sa: %ld n_max_gps: %ld n_max_cbs: %ld cver %ld gps %ld #online %u\n", __func__, stoppedat - rfp->rcu_fwd_startat, jiffies - stoppedat, |