Messages in this thread | | | Date | Tue, 20 Dec 2005 09:35:07 -0500 (EST) | From | Nicolas Pitre <> | Subject | Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch |
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On Wed, 21 Dec 2005, Nick Piggin wrote:
> Nicolas Pitre wrote: > > On Tue, 20 Dec 2005, Nick Piggin wrote: > > > > Considering that on UP, the arm should not need to disable interrupts > > > for this function (or has someone refuted Linus?), how about: > > > > > > Kernel preemption. > > > > preempt_disable() ?
Sure, and we're now more costly than the current implementation with irq disabling.
If we go with simple mutexes that's because there is a gain, even a huge one on ARM, especially for the fast uncontended case. If you guys insist on making things so generic and rigid then there is no gain anymore worth the bother.
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