----- On Jun 25, 2020, at 9:44 AM, rostedt rost...@goodmis.org wrote: > From: "Steven Rostedt (VMware)" <rost...@goodmis.org> > > [ SEVEN YEAR PROBLEM SOLVED! ] > > Up until now, if an event is interrupted while it is recorded by an > interrupt, and that interrupt records events, the time of those events will > all be the same. This is because events only record the delta of the time > since the previous event (or beginning of a page), and to handle updating > the time keeping for that of nested events is extremely racy. After years of > thinking about this and several failed attempts, I finally have a solution > to solve this puzzle.
Out of curiosity, considering that LTTng has solved this problem 10+ years ago with a simpler concurrency-friendly time-stamping model, why not simply use it rather than add complexity to the current ftrace timestamp scheme ? Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
