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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2018-05-24 18:58:16 -0400 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-07-12 15:39:21 -0700 |
| commit | cd23ac8ddb7be993f88bee893b89a8b4971c3651 (patch) | |
| tree | 5dd316bd3b508a0c1261772425a2520330dee7ca /kernel/rcu | |
| parent | c03be752d39dc64dcfda0ac8ce87fb10b1ee5621 (diff) | |
| download | linux-cd23ac8ddb7be993f88bee893b89a8b4971c3651.tar.gz linux-cd23ac8ddb7be993f88bee893b89a8b4971c3651.tar.bz2 linux-cd23ac8ddb7be993f88bee893b89a8b4971c3651.zip | |
rcu: Add comment to the last sleep in the rcu tasks loop
At the end of rcu_tasks_kthread() there's a lonely
schedule_timeout_uninterruptible() call with no apparent rationale for
its existence. But there is. It is to keep the thread from going into
a tight loop if there's some anomaly. That really needs a comment.
Link: http://lkml.kernel.org/r/20180524223839.GU3803@linux.vnet.ibm.com
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/update.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index 4c7c49c106ee..39cb23d22109 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -814,6 +814,7 @@ static int __noreturn rcu_tasks_kthread(void *arg) list = next; cond_resched(); } + /* Paranoid sleep to keep this from entering a tight loop */ schedule_timeout_uninterruptible(HZ/10); } } |