Messages in this thread |  | | Date | Thu, 20 Sep 2001 04:07:02 +0200 | From | Andrea Arcangeli <> | Subject | Re: Deadlock on the mm->mmap_sem |
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On Wed, Sep 19, 2001 at 08:19:09PM +0200, Manfred Spraul wrote: > > if we go generic then I strongly recommend my version of the generic > > semaphores is _much_ faster (and cleaner) than this one (it even > allows > > more than 2^31 concurrent readers on 64 bit archs ;). > > > Andrea, > > implementing recursive semaphores is trivial, but do you have any idea > how to fix the latency problem?
yes, one solution to the latency problem without writing the ugly code would be simply to add a per-process counter to pass to a modified rwsem api, then to hide the trickery in a mm_down_read macro. such way it will be recursive _and_ fair.
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