This week at LWN: Speculating on page faults
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Improving the performance of the kernel is generally a good thing to do; that is why many of our best developers have put considerable amounts of time into optimization work. One area which has recently seen some attention is in the handling of soft page faults. As the course of this work shows, though, performance problems are not always where one thinks they might be; sometimes it's necessary to take a step back and reevaluate the situation, possibly dumping a lot of code in the process.
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