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* Matthew Wilcox <matthew@wil.cx> wrote: > > the gain is rather obvious: two parallel up()s (or just up()s which > > come close enough after each other) will wake up two tasks in > > parallel. With your patch, the first guy wakes up and then it wakes > > up the second guy. I.e. your patch serializes the wakeup chain, mine > > keeps it parallel. > > Yup. I explained why that's actually beneficial in an earlier email. but the problem is that by serializing the wakeup chains naively you introduced a more than 50% AIM7 performance regression. Ingo -- 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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