Re: Re-tune x86 uaccess code for PREEMPT_VOLUNTARY

From: Mike Galbraith
Date: Sat Aug 10 2013 - 01:57:38 EST

On Fri, 2013-08-09 at 21:42 -0700, H. Peter Anvin wrote:
> On 08/09/2013 04:04 PM, Andi Kleen wrote:
> >
> > This patch kit is an attempt to get us back to sane code,
> > mostly by doing proper inlining and doing sleep checks in the right
> > place. Unfortunately I had to add one tree sweep to avoid an nasty
> > include loop.
> >
> > It costs a bit of text space, but I think it's worth it
> > (if only to keep my blood pressure down while reading ftrace logs...)
> >
> Looks nice at first glance.
> Now, here is a bigger question: shouldn't we be deprecating/getting rid

I sure hope not, PREEMPT munches throughput. If you need PREEMPT, seems
to me what you _really_ need is PREEMPT_RT (the real deal), so
eventually depreciating PREEMPT makes more sense to me.


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