Hi, the Linux kernel tracing infrastructure has support for using different clocks to generate timestamps for trace events. Especially in TSN networks it's useful to have TAI as trace clock, because the application scheduling is done in accordance to the network time, which is based on TAI. With a tai trace_clock in place, it becomes very convenient to correlate network activity with Linux kernel application traces. However, there's no fast accessor for CLOCK_TAI yet. Therefore, patch #1 is adding one. Patch #2 introduces the clock and the last one adds documentation for it. Changes since v1: - Add missing data_race() annotation for TAI offset which is accessed without any form of locking for KCSAN (Thomas) - Add missing documentation entry for ktime_get_tai_fast_ns() - Minor changelog tweaks Previous versions: - https://lore.kernel.org/all/20220409081300.4762-1-kurt@xxxxxxxxxxxxx/ Thanks, Kurt Kurt Kanzenbach (3): timekeeping: Introduce fast accessor to clock tai tracing: Introduce trace clock tai tracing: Add documentation for trace clock tai Documentation/core-api/timekeeping.rst | 1 + Documentation/trace/ftrace.rst | 12 ++++++++++++ include/linux/timekeeping.h | 1 + kernel/time/timekeeping.c | 17 +++++++++++++++++ kernel/trace/trace.c | 1 + 5 files changed, 32 insertions(+) -- 2.30.2
