Messages in this thread |  | | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] task_struct colouring ... | Date | 30 Nov 2001 17:05:20 -0800 |
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Followup to: <Pine.LNX.4.40.0111301614000.1600-100000@blue1.dev.mcafeelabs.com> By author: Davide Libenzi <davidel@xmailserver.org> In newsgroup: linux.dev.kernel > > The point is why store kernel pointers in global registers when You can > achieve the same functionality, with a smaller patch, that does not need > to be recoded for each CPU, without using global registers. >
Because global registers are faster! This is exactly the kind of stuff that is properly CPU-dependent and should be treated as such. Heck, it even depends on what kind of multiprocessor architecture, if any, you're using!
That being said, I belive that on most, if not all, processors, the idea of having the pointer point not to "current" but to a per-CPU memory area is *very* appealing, and a change that should be made uniform unless it's a significant lose on some machines...
-hpa -- <hpa@transmeta.com> at work, <hpa@zytor.com> in private! "Unix gives you enough rope to shoot yourself in the foot." http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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