The following commit has been merged into the core/rcu branch of tip: Commit-ID: e44111ed20d8b2d7b05b20d694358ae77d4e93e2 Gitweb: https://git.kernel.org/tip/e44111ed20d8b2d7b05b20d694358ae77d4e93e2 Author: Paul E. McKenney <paulmck@xxxxxxxxxx> AuthorDate: Fri, 02 Apr 2021 21:51:50 -07:00 Committer: Paul E. McKenney <paulmck@xxxxxxxxxx> CommitterDate: Mon, 10 May 2021 16:22:54 -07:00 rcu: Add ->rt_priority and ->gp_start to show_rcu_gp_kthreads() output This commit adds ->rt_priority and ->gp_start to show_rcu_gp_kthreads() output in order to better diagnose RCU priority boosting failures. Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> --- kernel/rcu/tree_stall.h | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h index 59b95cc..fb47025 100644 --- a/kernel/rcu/tree_stall.h +++ b/kernel/rcu/tree_stall.h @@ -726,6 +726,7 @@ void show_rcu_gp_kthreads(void) unsigned long j; unsigned long ja; unsigned long jr; + unsigned long js; unsigned long jw; struct rcu_data *rdp; struct rcu_node *rnp; @@ -734,11 +735,12 @@ void show_rcu_gp_kthreads(void) j = jiffies; ja = j - data_race(rcu_state.gp_activity); jr = j - data_race(rcu_state.gp_req_activity); + js = j - data_race(rcu_state.gp_start); jw = j - data_race(rcu_state.gp_wake_time); - pr_info("%s: wait state: %s(%d) ->state: %#lx delta ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_flags %#x\n", + pr_info("%s: wait state: %s(%d) ->state: %#lx ->rt_priority %u delta ->gp_start %lu ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_flags %#x\n", rcu_state.name, gp_state_getname(rcu_state.gp_state), - rcu_state.gp_state, t ? t->state : 0x1ffffL, - ja, jr, jw, (long)data_race(rcu_state.gp_wake_seq), + rcu_state.gp_state, t ? t->state : 0x1ffffL, t ? t->rt_priority : 0xffU, + js, ja, jr, jw, (long)data_race(rcu_state.gp_wake_seq), (long)data_race(rcu_state.gp_seq), (long)data_race(rcu_get_root()->gp_seq_needed), data_race(rcu_state.gp_flags));
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