Messages in this thread | | | Date | Fri, 12 Jul 2002 12:40:28 -0700 | From | William Lee Irwin III <> | Subject | Re: [Lse-tech] Minutes from LSE Con Call |
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On Fri, Jul 12, 2002 at 11:38:06AM -0700, Hanna Linder wrote: > 8. Daniel asked about seeing results of rmap on a numaq. > Martin got distracted but will get back to getting some > results.
On elm3b17 I found more 2.5.25 vs. NUMA-Q issues and got workarounds for booting while doing work on stuffing pte_chains into highmem:
(1) cpu_init() heisenbug that goes away when adding printk's I just added the extra printk's and moved on (2) in_interrupt() is racy and needs to disable preemption while checking per-cpu counters. The trivial fix. (3) CONFIG_PREEMPT calls preempt_schedule() on secondaries before they're ready, and the exception is flagged as no vm86_info: BAD Didn't want to go to deep into it at 3AM and disabled preempt.
The usual ioremap()/smp_call_function() deadlock, irqbalance plugging unreachable cpu's into ioapics, bio splitting to make qlogicisp happy, and MAX_IO_APICS things are still needed.
So I guess the "real fixes" need to get found at some point and propagated out to maintainers. hpa and mochel are on cpu_init(), and rml should be on preempt vs. printk and in_interrupt(). axboe has already got bio splitting ready and no idea about the MAX_IO_APICS and getting irqbalance fixes past mingo doesn't look easy.
Cheers, Bill - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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