Write barrier

In operating systems, write barrier is a mechanism for enforcing a particular ordering in a sequence of writes to a storage system in a computer system. For example, a write barrier in a file system is a mechanism (program logic) that ensures that in-memory file system state is written out to persistent storage in the correct order.[1][2][3]

In Garbage collection

A write barrier in a garbage collector is a fragment of code emitted by the compiler immediately before every store operation to ensure that (e.g.) generational invariants are maintained. A write barrier in a memory system, also known as a memory barrier, is a hardware-specific compiler intrinsic that ensures that all preceding memory operations "happen before" all subsequent ones.[4]

See also

References
  1. "Chapter 16. Write Barriers". docs.fedoraproject.org. Retrieved 2014-01-24.
  2. Tejun Heo (2005-07-22). "I/O Barriers". kernel/git/torvalds/linux.git - Linux kernel source tree. git.kernel.org. Retrieved 2014-01-24.
  3. Jonathan Corbet (2010-08-18). "The end of block barriers". LWN.net. Retrieved 2014-01-24.
  4. "GC FAQ -- algorithms". www.iecc.com. Retrieved 2020-06-30.


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