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: v0.11.0~52
X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=commitdiff_plain;h=64478021edcf7a5ac3bca3fa9e8b8108d2fbb9b6;hp=64478021edcf7a5ac3bca3fa9e8b8108d2fbb9b6;ds=sidebyside

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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