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| author | Paul E. McKenney <paulmck@linux.ibm.com> | 2018-09-22 03:08:09 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2018-12-01 21:45:34 +0100 |
| commit | 5ab7ab8362fa8a4f7995d65ea05edf71530e8004 (patch) | |
| tree | 4190fcc5cbb3e11acfb85f70efeae31193b16c26 /kernel/rcu/tree_plugin.h | |
| parent | rcutorture: Break up too-long rcu_torture_fwd_prog() function (diff) | |
| download | linux-5ab7ab8362fa8a4f7995d65ea05edf71530e8004.tar.xz linux-5ab7ab8362fa8a4f7995d65ea05edf71530e8004.zip | |
rcutorture: Affinity forward-progress test to avoid housekeeping CPUs
This commit affinities the forward-progress tests to avoid hogging a
housekeeping CPU on the theory that the offloaded callbacks will be
running on those housekeeping CPUs.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
[ paulmck: Fix NULL-pointer issue located by kbuild test robot. ]
Tested-by: Rong Chen <rong.a.chen@intel.com>
Diffstat (limited to 'kernel/rcu/tree_plugin.h')
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 605ff3b06098..25fe26c4e9c1 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -2603,6 +2603,17 @@ static bool init_nocb_callback_list(struct rcu_data *rdp) return true; } +/* + * Bind the current task to the offloaded CPUs. If there are no offloaded + * CPUs, leave the task unbound. Splat if the bind attempt fails. + */ +void rcu_bind_current_to_nocb(void) +{ + if (cpumask_available(rcu_nocb_mask) && cpumask_weight(rcu_nocb_mask)) + WARN_ON(sched_setaffinity(current->pid, rcu_nocb_mask)); +} +EXPORT_SYMBOL_GPL(rcu_bind_current_to_nocb); + #else /* #ifdef CONFIG_RCU_NOCB_CPU */ static bool rcu_nocb_cpu_needs_barrier(int cpu) |