Commit-ID: aa3e0bf1aa76579c6c51a2c1116a630aa716379d
Gitweb: http://git.kernel.org/tip/aa3e0bf1aa76579c6c51a2c1116a630aa716379d
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 23 Mar 2016 10:43:23 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon, 14 Nov 2016 10:46:31 -0800
rcu: Don't kick unless grace period or request
The current code can result in spurious kicks when there are no grace
periods in progress and no grace-period-related requests. This is
sort of OK for a diagnostic aid, but the resulting ftrace-dump messages
in dmesg are annoying. This commit therefore avoids spurious kicks
in the common case.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
---
kernel/rcu/tree.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 865af18..96c52e4 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1304,7 +1304,8 @@ static void rcu_stall_kick_kthreads(struct rcu_state *rsp)
if (!rcu_kick_kthreads)
return;
j = READ_ONCE(rsp->jiffies_kick_kthreads);
- if (time_after(jiffies, j) && rsp->gp_kthread) {
+ if (time_after(jiffies, j) && rsp->gp_kthread &&
+ (rcu_gp_in_progress(rsp) || READ_ONCE(rsp->gp_flags))) {
WARN_ONCE(1, "Kicking %s grace-period kthread\n", rsp->name);
rcu_ftrace_dump(DUMP_ALL);
wake_up_process(rsp->gp_kthread);
--
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