linux-kernel - Re: [RFC PATCH] introduce sys_membarrier(): process-wide memory barrier

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Message-ID: <1262870131.28171.3711.camel@gandalf.stny.rr.com>
Date:	Thu, 07 Jan 2010 08:15:31 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Josh Triplett <josh@...htriplett.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org,
	tglx@...utronix.de, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	laijs@...fujitsu.com, dipankar@...ibm.com
Subject: Re: [RFC PATCH] introduce sys_membarrier(): process-wide memory
 barrier

On Thu, 2010-01-07 at 09:44 +0100, Peter Zijlstra wrote:

> A simple:
> 
>   for_each_cpu(cpu, current->mm->cpu_vm_mask) {
>      if (cpu_curr(cpu)->mm == current->mm)
>         smp_call_function_single(cpu, func, NULL, 1);
>   }

I like this algorithm the best ;-)

-- Steve


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