On Mon, Apr 24, 2006 at 02:07:01PM -0700, Linus Torvalds wrote:
> debugging standpoint. So even if it's just that every registered SA_SHIRQ
> would get a heartbeat at least once every five seconds (and we'd limit it
> to SA_SHIRQ exactly because a driver that doesn't have that set may get
> confused if it gets extra interrupts), that might sound totally useless,
> but it might actually help somebody who otherwise might just make a pretty
> useless "the machine hung" bug-report.
Have to watch enable/disable_irq and the other races here.
> The fake interrupt could even print out a warning if somebody returns
> SA_HANDLED (since normally there _shouldn't_ have been any work to handle
> for it), and if that means that for somebody, things go from "the machine
> hung" to "the machine got very slow, and printed out 'fake interrupt for
> ide0 returned SA_HANDLED!'", that would potentially be a big debug aid.
There are high rate IRQ sources that would trigger that erratically due to
races but it could be useful in some kind of "linux irqdebug" mode
> We've had our ass saved quite a few times now by the irq storm detector
> ("irq X: nobody cared" and friends), which has helped debug irqs that
> haven't been set up properly, that I'm convinced things like this might
> well make a huge deal.
Yep
Alan
--
"... and for $64000 question, could you get yourself vaguely familiar with
the notion of on-topic posting?"
-- Al Viro
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