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| author | Paul E. McKenney <paulmck@kernel.org> | 2023-08-15 15:53:32 -0700 |
|---|---|---|
| committer | Frederic Weisbecker <frederic@kernel.org> | 2023-09-11 22:36:40 +0200 |
| commit | 7c1b3e0c988f2902695ef6175ab8ad00c0e8b65f (patch) | |
| tree | 3846992df9efbddb1d02fe5f275b9b046de0a73b /kernel/rcu | |
| parent | 5b404fdabacf4bee92d8c66013402a85f18a6a10 (diff) | |
| download | linux-7c1b3e0c988f2902695ef6175ab8ad00c0e8b65f.tar.gz linux-7c1b3e0c988f2902695ef6175ab8ad00c0e8b65f.tar.bz2 linux-7c1b3e0c988f2902695ef6175ab8ad00c0e8b65f.zip | |
rcutorture: Add test of RCU CPU stall notifiers
This commit registers an RCU CPU stall notifier when testing RCU CPU
stalls. The notifier logs a message similar to the following:
rcu_torture_stall_nf: v=1, duration=21001.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/rcutorture.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index ade42d6a9d9b..1830cacac01d 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -21,6 +21,7 @@ #include <linux/spinlock.h> #include <linux/smp.h> #include <linux/rcupdate_wait.h> +#include <linux/rcu_notifier.h> #include <linux/interrupt.h> #include <linux/sched/signal.h> #include <uapi/linux/sched/types.h> @@ -2428,6 +2429,16 @@ static int rcutorture_booster_init(unsigned int cpu) return 0; } +static int rcu_torture_stall_nf(struct notifier_block *nb, unsigned long v, void *ptr) +{ + pr_info("%s: v=%lu, duration=%lu.\n", __func__, v, (unsigned long)ptr); + return NOTIFY_OK; +} + +static struct notifier_block rcu_torture_stall_block = { + .notifier_call = rcu_torture_stall_nf, +}; + /* * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then * induces a CPU stall for the time specified by stall_cpu. @@ -2435,9 +2446,14 @@ static int rcutorture_booster_init(unsigned int cpu) static int rcu_torture_stall(void *args) { int idx; + int ret; unsigned long stop_at; VERBOSE_TOROUT_STRING("rcu_torture_stall task started"); + ret = rcu_stall_chain_notifier_register(&rcu_torture_stall_block); + if (ret) + pr_info("%s: rcu_stall_chain_notifier_register() returned %d, %sexpected.\n", + __func__, ret, !IS_ENABLED(CONFIG_RCU_STALL_COMMON) ? "un" : ""); if (stall_cpu_holdoff > 0) { VERBOSE_TOROUT_STRING("rcu_torture_stall begin holdoff"); schedule_timeout_interruptible(stall_cpu_holdoff * HZ); @@ -2481,6 +2497,11 @@ static int rcu_torture_stall(void *args) cur_ops->readunlock(idx); } pr_alert("%s end.\n", __func__); + if (!ret) { + ret = rcu_stall_chain_notifier_unregister(&rcu_torture_stall_block); + if (ret) + pr_info("%s: rcu_stall_chain_notifier_unregister() returned %d.\n", __func__, ret); + } torture_shutdown_absorb("rcu_torture_stall"); while (!kthread_should_stop()) schedule_timeout_interruptible(10 * HZ); |