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This bit, introduced in kernel 4.7, is used to indicate a perf ring buffer will be written backward [1]. This is mainly used for overwritable perf ring buffer. Suggested-by: Lorenz Bauer <lmb@isovalent.com> Signed-off-by: Francis Laniel <flaniel@microsoft.com> [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9ecda41acb97