linux-kernel - Re: [PATCH 1/2] percpu-rw-semaphores: use light/heavy barriers

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Message-ID: <1351025831.13456.43.camel@twins>
Date:	Tue, 23 Oct 2012 22:57:11 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] percpu-rw-semaphores: use light/heavy barriers

On Tue, 2012-10-23 at 21:23 +0200, Oleg Nesterov wrote:
> 
>         static void mb_ipi(void *arg)
>         {
>                 smp_mb(); /* unneeded ? */
>         }
> 
>         static void force_mb_on_each_cpu(void)
>         {
>                 smp_mb();
>                 smp_call_function(mb_ipi, NULL, 1);
>         } 

You know we're spending an awful lot of time and effort to get rid of
such things, right? RT and HPC people absolutely hate these random IPI
things.
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