Hi, I would like to discuss a possible way of getting the feature of the latecy_hist.patch [1] added to mainline. "Latency histograms are primarily relevant in the context of real-time enabled kernels (CONFIG_PREEMPT/CONFIG_PREEMPT_RT)and are used in the quality management of the Linux real-time capabilities." Steven pointed out that this might be doable based on Tom Zanussi's "[PATCH v4 0/7] tracing: 'hist' triggers" [2]. Here are my findings. It was not too complicated to get it working, though I had to add some hacks. I have added comments to each patch. cheers, daniel [2] https://lkml.org/lkml/2015/4/10/591 [1] https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit/?h=v3.14-rt-rebase&id=56d50cc34943bbba12b8c5942ee1ae3b29f73acb Daniel Wagner (4): tracing: Add support to sort on the key tracing: Add option to quantize key values tracing: Deference pointers without RCU checks tracing: Add trace_irqsoff tracepoints Tom Zanussi (1): tracing: 'hist' triggers include/linux/rculist.h | 36 +++++++++++++++++++++++++++++ include/linux/tracepoint.h | 4 ++-- include/trace/events/latency.h | 40 ++++++++++++++++++++++++++++++++ kernel/trace/trace_events_hist.c | 46 +++++++++++++++++++++++++++++++++---- kernel/trace/trace_events_trigger.c | 18 +++++++++------ kernel/trace/trace_irqsoff.c | 38 ++++++++++++++++++++++++++++++ 6 files changed, 168 insertions(+), 14 deletions(-) create mode 100644 include/trace/events/latency.h -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
