Messages in this thread | | | Subject | Re: [PATCH HACK] powerpc: quick hack to get a functional eHEA with hardirq preemption | From | Benjamin Herrenschmidt <> | Date | Wed, 24 Sep 2008 20:17:47 +1000 |
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On Wed, 2008-09-24 at 04:58 -0500, Milton Miller wrote: > The per-interrupt mask and unmask calls have to go through RTAS, a > single-threaded global context, which in addition to increasing > path length will really limit scalability. The interrupt controller > poll and reject facilities are accessed through hypervisor calls > which are comparable to a fast syscall, and parallel to all cpus.
Note also that the XICS code thus assumes, iirc, as does the cell IIC code, that eoi is called on the -same- cpu that fetched the interrupt initially. That assumption can be broken with IRQ threads no ?
Ben.
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