linux-kernel - Re: RFC: Kernel lock elision for TSX

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Date:	Sun, 24 Mar 2013 15:17:37 +0100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Michael Neuling <michael.neuling@....ibm.com>
Subject: Re: RFC: Kernel lock elision for TSX

On Sat, 2013-03-23 at 19:00 +0100, Andi Kleen wrote:
> Hi Linux,
> 
> Thanks.  Other code/design review would be still appreciated, even
> under the current constraints.
> 
> > The other comment I have is that since it does touch non-x86 header
> > files etc (although not a lot), you really need to talk to the POWER8
> > people about naming of the thing. Calling it <linux/rtm.h> and having
> > "generic" helpers called _xtest() used by the generic spinlock code
> > sounds a bit suspect.
> 
> I can make up another name for _xtest()/_xabort() and linux/rtm.h,
> (any suggestions?)
> 
> The basic concepts implemented there should be pretty universal.
> If others have a equivalent of "is this a transaction" and "abort
> this tranction" they can just plug it in. Otherwise they will nop it,
> as it's only hints anyways.
> 
> The only things used outside x86 code is _xtest()/_xabort(), can
> remove the rest from linux/*. Without transactions this is all nops.
> The primary interface for the lock code is the much higher level
> elide()/elide_lock_adapt() interface anyways.

Adding Michael Neuling to the CC list, he's probably the LTC person who
is the most familiar with POWER8 TM at the moment.

Cheers,
Ben.

> -Andi
> 


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