From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 8 Oct 2012 14:44:38 +0000 (-0400)
Subject: Fix urcu-call-rcu-impl.h: false-sharing
X-Git-Tag: v0.8.0~201
X-Git-Url: https://git.liburcu.org/?a=commitdiff_plain;h=b9f893b69fbc31baea418794938f4eb74cc4923a;hp=b9f893b69fbc31baea418794938f4eb74cc4923a;p=urcu.git

Fix urcu-call-rcu-impl.h: false-sharing

> >  struct call_rcu_data {
> > -   struct cds_wfq_queue cbs;
> > +   /*
> > +    * Align the tail on cache line size to eliminate false-sharing
> > +    * with head.
> > +    */
> > +   struct cds_wfcq_tail __attribute__((aligned(CAA_CACHE_LINE_SIZE))) cbs_tail;
> > +   /* Alignment on cache line size will add padding here */
> > +
> > +   struct cds_wfcq_head cbs_head;
>
>
> wrong here. In this code, cbs_tail and cbs_head are in the same cache line.

Reported-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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