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[$] Short waits with umwait
Thursday June 13, 2019. 07:04 PM , from LWN.net
If a user-space process needs to wait for some event to happen, there is a
whole range of mechanisms provided by the kernel to make that easy. But calling into the kernel tends not to work well for the shortest of waits — those measured in small numbers of microseconds. For delays of this magnitude, developers often resort to busy loops, which have a much smaller potential for turning a small delay into a larger one. Needless to say, busy waiting has its own disadvantages, so Intel has come up with a set of instructions to support short delays. A patch set from Fenghua Yu to support these instructions is currently working its way through the review process.
https://lwn.net/Articles/790920/rss
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