linux-kernel - Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

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Message-Id: <200905221557.54195.lkml@morethan.org>
Date:	Fri, 22 May 2009 15:57:51 -0500
From:	"Michael S. Zick" <lkml@...ethan.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

On Fri May 22 2009, Andi Kleen wrote:
> > If it: "Does not make a difference" then it "Should not make a difference"
> > but it does, try it yourself.  Its safe (if LOCK_PREFIX is in the proper
> > places) - the machine will ignore the opcode if is recent enough to not
> > need it - just trust the cpu's micro-code.
> 
> It doesn't ignore it, in fact it's extremly slow on some older systems
> where all atomic operations are very costly.
> That is why LOCK is avoided as much as possible.
> 

I'm only the messanger.

Mike
> -Andi


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