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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2016-03-23 10:43:23 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2016-11-14 10:46:31 -0800
commitaa3e0bf1aa76579c6c51a2c1116a630aa716379d (patch)
treed386fccec6234fdc02a9ee7da8c8513ce5203cc4 /kernel/rcu
parent0742ac3e2f9f4b8a3a394a270d8685078837662b (diff)
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@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 865af187498e..96c52e43f7ca 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);