From mboxrd@z Thu Jan  1 00:00:00 1970
From: pbonzini@redhat.com (Paolo Bonzini)
Date: Thu, 22 Sep 2011 09:53:14 +0200
Subject: [ltt-dev] [URCU PATCH] atomic: provide seq_cst semantics on
	powerpc
In-Reply-To: <20110922002712.GA8516@Krystal>
References: <1316502769-576-2-git-send-email-pbonzini@redhat.com>
	<20110920163518.GB31802@Krystal>
	<20110921235623.GI2394@linux.vnet.ibm.com>
	<20110922002712.GA8516@Krystal>
Message-ID: <4E7AE96A.8060307@redhat.com>

On 09/22/2011 02:27 AM, Mathieu Desnoyers wrote:
> Paolo: if you are interested in optimising powerpc uatomic ops further,
> add, sub, inc, dec, "or", "and", basically anything that is not
> xchg/add_return/cmpxchg could use versions of the cmpxchg that does not
> have the lwsync/sync barriers.

Or they could just be rewritten in assembly with a manual ll/sc loop.

Paolo