On Thu, Oct 22, 2015 at 06:28:22PM +0800, Wangnan (F) wrote: > information to analysis when glitch happen. Another way we are trying to > implement > now is to dynamically turn events on and off, or at least enable/disable > sampling dynamically because the overhead of copying those samples > is a big part of perf's total overhead. After that we can trace as many > event as possible, but only fetch data from them when we detect a glitch.
So why don't you 'fix' the flight recorder mode and just leave the data in memory and not bother copying it out until a glitch happens? Something like this: lkml.kernel.org/r/20130708121557.ga17...@twins.programming.kicks-ass.net it appears we never quite finished that. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
