Commit-ID: 6308f3477510e15391ac82deaee66f8425339014
Gitweb: https://git.kernel.org/tip/6308f3477510e15391ac82deaee66f8425339014
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 14 Feb 2018 14:20:45 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Tue, 20 Feb 2018 16:21:13 -0800
rcu: Remove SRCU throttling
The code in srcu_gp_end() inserts a delay every 0x3ff grace periods in
order to prevent SRCU grace-period work from consuming an entire CPU
when there is a long sequence of expedited SRCU grace-period requests.
However, all of SRCU's grace-period work is carried out in workqueues,
which are in turn within kthreads, which are automatically throttled as
needed by the scheduler. In particular, if there is plenty of idle time,
there is no point in throttling.
This commit therefore removes the expedited SRCU grace-period throttling.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/srcutree.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index f962f4428c39..e2796f79a597 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -596,9 +596,7 @@ static void srcu_gp_end(struct srcu_struct *sp)
ULONG_CMP_LT(gpseq, sp->srcu_gp_seq_needed)) {
srcu_gp_start(sp);
spin_unlock_irq_rcu_node(sp);
- /* Throttle expedited grace periods: Should be rare! */
- srcu_reschedule(sp, rcu_seq_ctr(gpseq) & 0x3ff
- ? 0 : SRCU_INTERVAL);
+ srcu_reschedule(sp, 0);
} else {
spin_unlock_irq_rcu_node(sp);
}
--
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