linux-kernel - Re: [PATCH 01/29] tsx: Add generic noop macros for RTM intrinsics

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Message-ID: <15098.1364201425@ale.ozlabs.ibm.com>
Date:	Mon, 25 Mar 2013 19:50:25 +1100
From:	Michael Neuling <mikey@...ling.org>
To:	Andi Kleen <ak@...ux.intel.com>
cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	x86@...nel.org
Subject: Re: [PATCH 01/29] tsx: Add generic noop macros for RTM intrinsics

Andi Kleen <ak@...ux.intel.com> wrote:

> > RTM == restricted transactional memory.  I don't understand why it's
> > "restricted" and why any other architecture else would call it that and
> 
> It's restricted as in there is no guarantee that a transaction ever succeeds
> and always needs a fallback path. My understanding is that this is true for 
> PPC too, but not necessarily zSeries.

Yes, ppc is limited in this way too.  We just didn't call it a silly
name, although we do have the TEXASR register for TM status to make up
for it.  :-)

Mikey

> 
> > hence why Linux should call it that?
> > 
> > Can we just call it TM for transactional memory?  Each arch can then
> > have their own implementation and call it what they want.
> 
> I don't think the name will stop them to do anything.
> 
> If people feel strongly about it can change it, but it's not
> actually making a real difference.
> 
> -Andi
> -- 
> ak@...ux.intel.com -- Speaking for myself only
> 
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