Hi Daniel, On Thu, 2015-04-30 at 12:06 +0200, Daniel Wagner wrote: > 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. > It looks like you were able to do quite a bit here with not much code - nice! Just FYI, I'll be working on a v5 of the hist triggers patchset that will incorporate the stuff from patch 1 (needs to be split into a separate patch for the triggers code already upstream, and one for hist triggers) and your comments from patch 2 (see comments in my reply to that patch), along with a couple other unrelated changes... Tom > 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 > -- 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
