From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Fri, 7 Dec 2018 22:06:39 +0000 (-0500)
Subject: Fix: only wait if work queue is empty in real-time mode
X-Git-Tag: v0.10.2~1
X-Git-Url: http://git.liburcu.org/?a=commitdiff_plain;h=803e59362b6d94edff3a36f47a9da3e8dca4bde2;hp=803e59362b6d94edff3a36f47a9da3e8dca4bde2;p=userspace-rcu.git

Fix: only wait if work queue is empty in real-time mode

Unconditionally waiting for 10 ms after the completion of every batch
of jobs of the work queue in real-time mode appears to be a behaviour
inherited from the call-rcu thread.

While this is a fair trade-off in the context of call-rcu, it is less
evident that it is desirable in the context of a general-purpose
work queue. Waiting when work is available artificially degrades the
latency characteristics of the work queue.

If a workqueue user even need the explicit delay for batching (e.g. if
a call-rcu implementation would ever use the workqueue worker thread),
it can add it within the worker_before_wait_fct callback received as
argument from workqueue creation.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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