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Subject[PATCH rcu 21/25] rcu: Make synchronize_rcu() fastpath update only boot-CPU counters
Date
Large systems can have hundreds of rcu_node structures, and updating
counters in each of them might slow down booting. This commit therefore
updates only the counters in those rcu_node structures corresponding
to the boot CPU, up to and including the root rcu_node structure.

The counters for the remaining rcu_node structures are updated by the
rcu_scheduler_starting() function, which executes just before the first
non-boot kthread is spawned.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/tree.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index b9e8ed00536d4..ef15bae3c7c77 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3504,11 +3504,14 @@ void synchronize_rcu(void)
rcu_poll_gp_seq_start_unlocked(&rcu_state.gp_seq_polled_snap);
rcu_poll_gp_seq_end_unlocked(&rcu_state.gp_seq_polled_snap);

- // Update normal grace-period counters to record grace period.
+ // Update the normal grace-period counters to record
+ // this grace period, but only those used by the boot CPU.
+ // The rcu_scheduler_starting() will take care of the rest of
+ // these counters.
local_irq_save(flags);
WARN_ON_ONCE(num_online_cpus() > 1);
rcu_state.gp_seq += (1 << RCU_SEQ_CTR_SHIFT);
- rcu_for_each_node_breadth_first(rnp)
+ for (rnp = this_cpu_ptr(&rcu_data)->mynode; rnp; rnp = rnp->parent)
rnp->gp_seq_needed = rnp->gp_seq = rcu_state.gp_seq;
local_irq_restore(flags);
}
@@ -4456,9 +4459,20 @@ early_initcall(rcu_spawn_gp_kthread);
*/
void rcu_scheduler_starting(void)
{
+ unsigned long flags;
+ struct rcu_node *rnp;
+
WARN_ON(num_online_cpus() != 1);
WARN_ON(nr_context_switches() > 0);
rcu_test_sync_prims();
+
+ // Fix up the ->gp_seq counters.
+ local_irq_save(flags);
+ rcu_for_each_node_breadth_first(rnp)
+ rnp->gp_seq_needed = rnp->gp_seq = rcu_state.gp_seq;
+ local_irq_restore(flags);
+
+ // Switch out of early boot mode.
rcu_scheduler_active = RCU_SCHEDULER_INIT;
rcu_test_sync_prims();
}
--
2.31.1.189.g2e36527f23
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