Messages in this thread | | | Date | Sun, 17 Oct 2004 19:12:09 +0200 | From | Ingo Molnar <> | Subject | Re: [ANNOUNCE] Linux 2.6 Real Time Kernel |
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* Dipankar Sarma <dipankar@in.ibm.com> wrote:
> It seems that way to me too. Long ago I implemented preemptible RCU, > but did not follow it through because I believed it was not a good > idea. The original patch is here : > > http://www.uwsg.iu.edu/hypermail/linux/kernel/0205.1/0026.html > > This allows read-side critical sections of RCU to be preempted. It > will take a bit of work to re-use it in RCU as of now, but I don't > think it makes sense to do so. My primary concern is DoS/OOM situation > due to preempted tasks holding up RCU.
the DoS/OOM problems are serious i believe. Preemptible RCU in that sense is 'RCU with no guarantee of progress', which sounds bad from a design POV.
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