Messages in this thread |  | | Date | Thu, 4 Jan 2001 13:54:24 -0800 (PST) | From | Nigel Gamble <> | Subject | Re: [PATCH] 2.4.0-prerelease: preemptive kernel. |
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On Thu, 4 Jan 2001, Andi Kleen wrote: > The problem is that current Linux semaphores are very costly locks -- they > always cause a context switch.
My preemptible kernel patch currently just uses Linux semaphores to implement sleeping kernel mutexes, but we (at MontaVista Software) are working on a new implementation that also does priority inheritance, to avoid the priority inversion problem, and that does the minimum necessary context switches.
Nigel Gamble nigel@nrg.org Mountain View, CA, USA. http://www.nrg.org/
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