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KernelTrap: Documenting Memory Barriers

Apr 03, 2006, 22:30 (0 Talkback[s])

"David Howells posted a document on memory barriers on the Linux Kernel mailing list. Memory barriers are a way of ordering IO accesses to devices from the kernel. His document has undergone a lot of revisions based on the feedback he's received from the developers of the Linux kernel. Excerpt:

"'... independent memory operations are effectively performed in random order, but this can be a problem for CPU-CPU interaction and for I/O. What is required is some way of intervening to instruct the compiler and the CPU to restrict the order...'"

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