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Subject: Re: [RFC PATCH] introduce sys_membarrier(): process-wide memory
 barrier
From: Steven Rostedt <rostedt@goodmis.org>
Reply-To: rostedt@goodmis.org
To: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Triplett <josh@joshtriplett.org>,
       Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       linux-kernel@vger.kernel.org,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
       Ingo Molnar <mingo@elte.hu>, akpm@linux-foundation.org,
       tglx@linutronix.de, Valdis.Kletnieks@vt.edu, dhowells@redhat.com,
       laijs@cn.fujitsu.com, dipankar@in.ibm.com
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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