1;2403;0cOn Mon 2013-05-06 10:55:47, Peter Zijlstra wrote:
> On Sun, May 05, 2013 at 11:18:44AM +0200, Ingo Molnar wrote:
> > That's the old 32-bit x86 trick to compute 'current' from the kernel stack
> > pointer.
> >
> > It can be done better - for example on platforms with optimized percpu
> > variables (x86-64) it looks like this:
>
> Doesn't i386 have all the funny per-cpu stuff too? So the only reason it still
> does the fugly stack based thing is because nobody could be arsed to do the
> work of converting it.
(Note that the quoted example was from ARM. But also note that the
percpu stuff requires memory access, so...)
Pavel
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