linux-kernel - Re: crazy idea: big percpu lock (Re: task isolation)

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Date:	Fri, 9 Oct 2015 10:27:13 +0100 (IST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andy Lutomirski <luto@...capital.net>,
	Christoph Lameter <cl@...ux.com>,
	Peter Zijlstra <peterz@...radead.org>
cc:	Chris Metcalf <cmetcalf@...hip.com>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Gilad Ben Yossef <giladb@...hip.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Tejun Heo <tj@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: crazy idea: big percpu lock (Re: task isolation)

On Thu, 8 Oct 2015, Andy Lutomirski wrote:
> I want to propose a new primitive that might go a long way toward
> solving this issue.  The new primitive would be called the "big percpu
> lock".

It took us 15+ years to get rid of the "Big Kernel Lock", so we really
don't want to add a new "Big XXX Lock". We have enough pain already
with preempt_disable() and local_irq_disable() which are basically
"Big CPU Locks".

Don't ever put BIG and LOCK into one context, really.

Thanks,

	tglx


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