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 -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
