rcu: ignore offline CPUs in last non-dyntick-idle CPU check
Offline CPUs are not in nohz_cpu_mask, but can be ignored when checking for the last non-dyntick-idle CPU. This patch therefore only checks online CPUs for not being dyntick idle, allowing fast entry into full-system dyntick-idle state even when there are some offline CPUs. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Родитель
0c34029abd
Коммит
5db356736a
|
@ -1016,7 +1016,7 @@ int rcu_needs_cpu(int cpu)
|
|||
|
||||
/* Don't bother unless we are the last non-dyntick-idle CPU. */
|
||||
for_each_cpu_not(thatcpu, nohz_cpu_mask)
|
||||
if (thatcpu != cpu) {
|
||||
if (cpu_online(thatcpu) && thatcpu != cpu) {
|
||||
per_cpu(rcu_dyntick_drain, cpu) = 0;
|
||||
per_cpu(rcu_dyntick_holdoff, cpu) = jiffies - 1;
|
||||
return rcu_needs_cpu_quick_check(cpu);
|
||||
|
|
Загрузка…
Ссылка в новой задаче