linux-kernel - Re: [PATCH 11/18] seqcount: Introduce raw_write_seqcount

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Date:	Thu, 18 Jun 2015 13:10:22 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, umgwanakikbuti@...il.com,
	mingo@...e.hu, ktkhai@...allels.com, tglx@...utronix.de,
	juri.lelli@...il.com, pang.xunlei@...aro.org, oleg@...hat.com,
	wanpeng.li@...ux.intel.com, linux-kernel@...r.kernel.org,
	Al Viro <viro@...IV.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 11/18] seqcount: Introduce raw_write_seqcount_barrier()

On Thu, 18 Jun 2015 09:54:07 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> Yep, I have to frequently remind them that most projects need to support
> old compilers.  And I did point out that the commentary at the end
> of that document would not encourage adoption of C11.  They of course
> felt this was unfair of me, so I have to thank you both for proving the
> correctness of my reply to them.  Although you guys didn't use quite as
> many swear words as I would have expected.  ;-)

I could add a few more if you would like ;-)


What's their issue? Is there some kind of benchmark war going on
between different compilers? Where they want want to prove they can
produce the absolute fastest code possible, but only use single
threaded apps and screw those that must support multi-threaded
applications.

My phone and my camera have multicore systems. Single threaded is not
the way of the future. Which ever compiler makes it easier to write
multi-threaded applications is going to win, regardless of how well a
compiler can claim they optimize code the best for a single threaded
app.

-- Steve


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