From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 9 Jun 2011 14:50:01 +0000 (-0400)
Subject: call_rcu: add back delay in list non-empty case
X-Git-Tag: v0.6.0~24
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=ccbac24d332cd81315a63229a053ad1813a193f0;p=userspace-rcu.git

call_rcu: add back delay in list non-empty case

commit bc94ca9bada25f7403e3e859caa241146ae8e338 changed the !RT behavior
slightly: when the list is not empty, it does not wait for a delay
anymore. Add this delay back, to ensure we don't flood the system with
frequent synchronize_rcu() calls, which would slow down readers.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu-call-rcu-impl.h b/urcu-call-rcu-impl.h
index 6fcf8c8..bd3126b 100644
--- a/urcu-call-rcu-impl.h
+++ b/urcu-call-rcu-impl.h
@@ -253,6 +253,8 @@ static void *call_rcu_thread(void *arg)
 				 * call_rcu list.
 				 */
 				cmm_smp_mb();
+			} else {
+				poll(NULL, 0, 10);
 			}
 		} else {
 			poll(NULL, 0, 10);