From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 6 Sep 2017 20:35:59 +0000 (-0400)
Subject: Fix: don't use membarrier SHARED syscall command in liburcu-bp
X-Git-Tag: v0.10.1~2
X-Git-Url: https://git.lttng.org/?a=commitdiff_plain;h=11486a15008b9848f52b55047b2e3f2db7ac1034;hp=11486a15008b9848f52b55047b2e3f2db7ac1034;p=urcu.git

Fix: don't use membarrier SHARED syscall command in liburcu-bp

One main user of liburcu-bp (lttng-ust) invokes synchronize_rcu()
repeatedly, without batching (does not use call_rcu).

Those delays introduced by sys_membarrier SHARED command significantly
impacts application startup time. Therefore, revert to not using the
membarrier SHARED command.

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