diff options
| author | Zqiang <qiang.zhang1211@gmail.com> | 2021-11-15 06:15:46 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-12-01 02:25:20 +0100 |
| commit | c2cf0767e98eb4487444e5c7ebba491a866811ce (patch) | |
| tree | a1e3a20af47a3f8a5cd599c8fa4c4e9babab257c | |
| parent | rcu: Improve tree_plugin.h comments and add code cleanups (diff) | |
| download | linux-c2cf0767e98eb4487444e5c7ebba491a866811ce.tar.xz linux-c2cf0767e98eb4487444e5c7ebba491a866811ce.zip | |
rcu: Avoid running boost kthreads on isolated CPUs
When the boost kthreads are created on systems with nohz_full CPUs,
the cpus_allowed_ptr is set to housekeeping_cpumask(HK_FLAG_KTHREAD).
However, when the rcu_boost_kthread_setaffinity() is called, the original
affinity will be changed and these kthreads can subsequently run on
nohz_full CPUs. This commit makes rcu_boost_kthread_setaffinity()
restrict these boost kthreads to housekeeping CPUs.
Signed-off-by: Zqiang <qiang.zhang1211@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index f44580276fbd..87fc4609b756 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1203,8 +1203,9 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu) if ((mask & leaf_node_cpu_bit(rnp, cpu)) && cpu != outgoingcpu) cpumask_set_cpu(cpu, cm); + cpumask_and(cm, cm, housekeeping_cpumask(HK_FLAG_RCU)); if (cpumask_weight(cm) == 0) - cpumask_setall(cm); + cpumask_copy(cm, housekeeping_cpumask(HK_FLAG_RCU)); set_cpus_allowed_ptr(t, cm); free_cpumask_var(cm); } |