1 post tagged #linux.
#linux
Asymmetric fences let you pay for a memory barrier only on the rare path. The common path gets a free compiler barrier; the uncommon path calls Linux membarrier(), which forces every other thread to run a full fence for you. Ryan Chung Yi Sheng's deep-dive follows the idea from the C++ standard down to the kernel, and finds a possible crack in the wording along the way.
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