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

[Peter Zijlstra]

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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