IPIQ messaging patch #1 for SMP
joerg at britannica.bec.de
Sun Apr 10 05:47:32 PDT 2005
On Sun, Apr 10, 2005 at 12:01:33AM -0700, Matthew Dillon wrote:
> * Implement a passive IPI message that does not signal the target cpu
> at all. The target cpu will process the message the next time it
> polls the queue (no less often then once a tick). Adjust the
> slab free() code to use this new API when freeing blocks owned by
> a different cpu. Such messages have huge target latencies (obviously)
> but cost virtually nothing on either the originating or target cpus
> because no hardware IPI is generated for the message.
How does this affect low memory situations?
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