linux-kernel - Re: [RFC][PATCH 0/5] arch: atomic rework

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Message-ID: <20140220185642.GY4250@linux.vnet.ibm.com>
Date:	Thu, 20 Feb 2014 10:56:42 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Torvald Riegel <triegel@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Will Deacon <will.deacon@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
	David Howells <dhowells@...hat.com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"gcc@....gnu.org" <gcc@....gnu.org>
Subject: Re: [RFC][PATCH 0/5] arch: atomic rework

On Thu, Feb 20, 2014 at 07:44:32PM +0100, Torvald Riegel wrote:
> xagsmtp3.20140220184514.1789@...gate.vnet.ibm.com
> X-Xagent-Gateway: bldgate.vnet.ibm.com (XAGSMTP3 at BLDGATE)
> 
> On Thu, 2014-02-20 at 10:11 -0800, Paul E. McKenney wrote:
> > But yes, the compiler guys would be extremely happy to simply drop
> > memory_order_consume from the standard, as it is the memory order
> > that they most love to hate.
> > 
> > Getting them to agree to any sort of peep-hole optimization semantics
> > for memory_order_consume is likely problematic.  
> 
> I wouldn't be so pessimistic about that.  If the transformations can be
> shown to be always correct in terms of the semantics specified in the
> standard, and if the performance win is sufficiently large, why not?  Of
> course, somebody has to volunteer to actually implement it :)

I guess that there is only one way to find out.  ;-)

							Thanx, Paul

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