diff options
| author | Paul E. McKenney <paulmck@kernel.org> | 2024-11-13 19:10:19 -0800 |
|---|---|---|
| committer | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2024-12-14 17:05:52 +0100 |
| commit | 223f16b87d70a62058d3b3f4aae0da570b4380a1 (patch) | |
| tree | 905b14ef82a591e5db7ab99ce0399e8e24f4e83b | |
| parent | 885a6f4729c688c50bb2f470dfcc0ad0dea43c1e (diff) | |
rcutorture: Add per-reader-segment preemption diagnostics
For preemptible RCU, this commit adds an indication for each
reader segments to whether the rcu_torture_reader() task was
on the ->blkd_tasks lists, though only in kernels built with
CONFIG_RCU_TORTURE_TEST_LOG_CPU=y.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
| -rw-r--r-- | kernel/rcu/rcutorture.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index ab354bb7f1b6..41b661bf000a 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -464,10 +464,8 @@ rcu_read_delay(struct torture_random_state *rrsp, struct rt_read_seg *rtrsp) rtrsp->rt_delay_us = shortdelay_us; } if (!preempt_count() && - !(torture_random(rrsp) % (nrealreaders * 500))) { + !(torture_random(rrsp) % (nrealreaders * 500))) torture_preempt_schedule(); /* QS only if preemptible. */ - rtrsp->rt_preempted = true; - } } static void rcu_torture_read_unlock(int idx) @@ -1961,8 +1959,11 @@ static void rcutorture_one_extend(int *readstate, int newstate, bool insoftirq, if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_CPU)) { int cpu = raw_smp_processor_id(); rtrsp->rt_cpu = cpu; - if (!first) + if (!first) { rtrsp[-1].rt_end_cpu = cpu; + if (cur_ops->reader_blocked) + rtrsp[-1].rt_preempted = cur_ops->reader_blocked(); + } } /* |