Messages in this thread | | | Date | Fri, 15 Feb 2002 15:22:03 +0100 (CET) | From | Roman Zippel <> | Subject | Re: [PATCH] move task_struct allocation to arch |
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Hi,
On Fri, 15 Feb 2002, Jeff Garzik wrote:
> > As I mentioned before I more like the byte approach, since atomic bit > > field handling is quite expensive on most architectures, where a simple > > set/clear byte is only one or two instructions, if there is byte > > load/store instruction. So I'd really like to see to leave the decision to > > the architecture, whether to use bit or byte fields. > > We have tons of code already using atomic test_and_set_bit type > stuff... why not just make sure your bit set/clear stuff is fast? :)
Because in this case there is no atomic test_and_(clear|set)_bit needed. We only need to clear the bit/byte before scheduling/signal delivery is started.
bye, Roman
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