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On Fri, Feb 27, 2004 at 12:55:55PM -0600, Matt Mackall wrote: > Let's imagine you have n sources simultaneously interrupting on a > given descriptor. Check the first, it's happening, acknowledge it, > exit, notice interrupt still asserted, check the first, nope, check > the second, yep, exit, etc. By the time we've made it to the nth ISR, > we've banged on the first one n times, the second n-1 times, etc. In > other words, early chain termination has an O(n^2) worst case. That is a pretty pathological worst case, and n is (almost?) always small. I don't know if it would make a lick of difference, or if it is worth the risk. Someone who has a lot of shared interrupts ought to try it. - 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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