Messages in this thread | | | From | Benny Amorsen <> | Subject | Re: IRQ off latency of printk is very high | Date | Fri, 26 Oct 2007 14:57:18 +0200 |
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>>>>> "MM" == Matt Mackall <mpm@selenic.com> writes:
MM> Well there are things we can do, yes, but I'd be worried that MM> they've give up the deterministic behavior we rely on quite MM> heavily for debugging. If event A happens before event B, we must MM> see the message from A before the one from B, even if B happens in MM> irq context.
MM> And if event B is a hard lock up, we'd also like to be sure the MM> message for A actually gets out. If B happens in the interrupt MM> that comes in when we re-enable them, that won't happen.
I can see the concerns, but right now it all leads to disabling serial console for real-time servers. That is even less helpful for debugging.
/Benny
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