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authorJoel Fernandes (Google) <joel@joelfernandes.org>2018-06-20 00:14:18 +0200
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-07-13 00:42:08 +0200
commit4babd855fd6137f9792117eb73b096c221a49d3c (patch)
tree5274671db713424db122f1564478592aea94d047 /kernel/rcu/rcu.h
parentrcutorture: Use monotonic timestamp for stall detection (diff)
downloadlinux-4babd855fd6137f9792117eb73b096c221a49d3c.tar.xz
linux-4babd855fd6137f9792117eb73b096c221a49d3c.zip
rcutorture: Add support to detect if boost kthread prio is too low
When rcutorture is built in to the kernel, an earlier patch detects that and raises the priority of RCU's kthreads to allow rcutorture's RCU priority boosting tests to succeed. However, if rcutorture is built as a module, those priorities must be raised manually via the rcutree.kthread_prio kernel boot parameter. If this manual step is not taken, rcutorture's RCU priority boosting tests will fail due to kthread starvation. One approach would be to raise the default priority, but that risks breaking existing users. Another approach would be to allow runtime adjustment of RCU's kthread priorities, but that introduces numerous "interesting" race conditions. This patch therefore instead detects too-low priorities, and prints a message and disables the RCU priority boosting tests in that case. Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/rcu.h')
-rw-r--r--kernel/rcu/rcu.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index 0453a7d12b3f..bee070979970 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -502,6 +502,7 @@ static inline void rcu_force_quiescent_state(void) { }
static inline void rcu_bh_force_quiescent_state(void) { }
static inline void rcu_sched_force_quiescent_state(void) { }
static inline void show_rcu_gp_kthreads(void) { }
+static inline int rcu_get_gp_kthreads_prio(void) { return 0; }
#else /* #ifdef CONFIG_TINY_RCU */
unsigned long rcu_get_gp_seq(void);
unsigned long rcu_bh_get_gp_seq(void);
@@ -510,6 +511,7 @@ unsigned long rcu_exp_batches_completed(void);
unsigned long rcu_exp_batches_completed_sched(void);
unsigned long srcu_batches_completed(struct srcu_struct *sp);
void show_rcu_gp_kthreads(void);
+int rcu_get_gp_kthreads_prio(void);
void rcu_force_quiescent_state(void);
void rcu_bh_force_quiescent_state(void);
void rcu_sched_force_quiescent_state(void);