Did you know...?LWN.net is a subscriber-supported publication; we rely on subscribers to keep the entire operation going. Please help out by buying a subscription and keeping LWN on the net. There may be no single organization which runs more Linux systems than Google. But the kernel development community knows little about how Google uses Linux and what sort of problems are encountered there. Goo
This article brought to you by LWN subscribersSubscribers to LWN.net made this article — and everything that surrounds it — possible. If you appreciate our content, please buy a subscription and make the next set of articles possible. Introduction Read-copy update (RCU) is a synchronization mechanism that was added to the Linux kernel in October of 2002. RCU improves scalability by allowing reader
The Linux kernel contains a number of primitives for controlling mutual exclusion. Semaphores and spinlocks (in several varieties) have been around for a while, and the read-copy-update mechanism was added in the 2.5 series. Yet another mechanism, called "fast reader/writer locks," has found its way into Andrew Morton's -mm patch set, and appears likely to be forwarded on to Linus soon for inclusi
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