[PATCH rcu 09/32] rcu-tasks: Handle idle tasks for recently offlined CPUs

Paul E. McKenney
2022-06-20T22:55:33Z

This commit identifies idle tasks for recently offlined CPUs as residing
in a quiescent state. This is safe only because CPU-hotplug operations
are excluded during these checks.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: KP Singh <kpsingh@kernel.org>
---
kernel/rcu/tasks.h | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index ec68bfe98c958..414861d651964 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -1318,27 +1318,26 @@ static int trc_inspect_reader(struct task_struct *t, void *bhp_in)
int nesting;
bool ofl = cpu_is_offline(cpu);

- if (task_curr(t)) {
- WARN_ON_ONCE(ofl && !is_idle_task(t));
-
+ if (task_curr(t) && !ofl) {
// If no chance of heavyweight readers, do it the hard way.
- if (!ofl && !IS_ENABLED(CONFIG_TASKS_TRACE_RCU_READ_MB))
+ if (!IS_ENABLED(CONFIG_TASKS_TRACE_RCU_READ_MB))
return -EINVAL;

// If heavyweight readers are enabled on the remote task,
// we can inspect its state despite its currently running.
// However, we cannot safely change its state.
n_heavy_reader_attempts++;
- if (!ofl && // Check for "running" idle tasks on offline CPUs.
- !rcu_dynticks_zero_in_eqs(cpu, &t->trc_reader_nesting))
+ // Check for "running" idle tasks on offline CPUs.
+ if (!rcu_dynticks_zero_in_eqs(cpu, &t->trc_reader_nesting))
return -EINVAL; // No quiescent state, do it the hard way.
n_heavy_reader_updates++;
- if (ofl)
- n_heavy_reader_ofl_updates++;
nesting = 0;
} else {
// The task is not running, so C-language access is safe.
nesting = t->trc_reader_nesting;
+ WARN_ON_ONCE(ofl && task_curr(t) && !is_idle_task(t));
+ if (IS_ENABLED(CONFIG_TASKS_TRACE_RCU_READ_MB) && ofl)
+ n_heavy_reader_ofl_updates++;
}

// If not exiting a read-side critical section, mark as checked
--
2.31.1.189.g2e36527f23