diff --git a/kernel/rcutree.h b/kernel/rcutree.h index 5f97eab602cd831dec54baaf7bafd970920d0c60..52be957c9fe22360a7a307842795c09353b42789 100644 --- a/kernel/rcutree.h +++ b/kernel/rcutree.h @@ -104,6 +104,8 @@ struct rcu_dynticks { /* idle-period nonlazy_posted snapshot. */ unsigned long last_accelerate; /* Last jiffy CBs were accelerated. */ + unsigned long last_advance_all; + /* Last jiffy CBs were all advanced. */ int tick_nohz_enabled_snap; /* Previously seen value from sysfs. */ #endif /* #ifdef CONFIG_RCU_FAST_NO_HZ */ }; diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h index 18d9c91f25d1d6add74f7aab9a712c43b8bf53b6..d81e3856fa91579016ce6e5568a5eabeee0f8dcd 100644 --- a/kernel/rcutree_plugin.h +++ b/kernel/rcutree_plugin.h @@ -1630,17 +1630,23 @@ module_param(rcu_idle_lazy_gp_delay, int, 0644); extern int tick_nohz_enabled; /* - * Try to advance callbacks for all flavors of RCU on the current CPU. - * Afterwards, if there are any callbacks ready for immediate invocation, - * return true. + * Try to advance callbacks for all flavors of RCU on the current CPU, but + * only if it has been awhile since the last time we did so. Afterwards, + * if there are any callbacks ready for immediate invocation, return true. */ static bool rcu_try_advance_all_cbs(void) { bool cbs_ready = false; struct rcu_data *rdp; + struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks); struct rcu_node *rnp; struct rcu_state *rsp; + /* Exit early if we advanced recently. */ + if (jiffies == rdtp->last_advance_all) + return 0; + rdtp->last_advance_all = jiffies; + for_each_rcu_flavor(rsp) { rdp = this_cpu_ptr(rsp->rda); rnp = rdp->mynode;