Thanks for posting this. I'll definitely try it out (already did actually).
The 'callstack' branches are available on Mathieu's github: https://github.com/compudj/lttng-modules-dev and https://github.com/compudj/lttng-tools-dev
The contexts to add are: * callstack-kernel * callstack-user lttng add-context -k -t callstack-kernel -t callstack-user Geneviève On 2017-03-31 09:17 AM, Mathieu Desnoyers wrote:
This patchset has been sitting in my dev branches for a while. I think it's time I post it for RFC. Add callstack contexts for lttng-modules kernel tracer (callstack-user for user-space callstack, and callstack-kernel for kernel callstack). It currently rely on frame pointers for user-space callstacks, so it's normal that we cannot get stack trace for all applications for now. We may want to investigate using unwind information in those situations. This is a RFC patchset. There are currently no tests for this feature in lttng-tools. Feedback is welcome! Thanks, Mathieu Francis Giraldeau (3): Pass arguments for context size computation Define max nesting count constant Add kernel and user callstack contexts Mathieu Desnoyers (7): Cleanup callstack context callstack context: use delimiter when stack is incomplete Fix: callstack context: false-sharing, bad memory size allocation Fix callstack context: write empty sequence if no stack trace Cleanup callstack context Fix: callstack context alignment calculation callstack context: bump number of entries to 128 Makefile | 3 +- lib/ringbuffer/frontend.h | 3 + lib/ringbuffer/frontend_api.h | 2 +- lttng-abi.c | 3 + lttng-abi.h | 2 + lttng-context-callstack.c | 361 ++++++++++++++++++++++++++++++++++++++++++ lttng-events.h | 12 ++ lttng-ring-buffer-client.h | 17 +- 8 files changed, 396 insertions(+), 7 deletions(-) create mode 100644 lttng-context-callstack.c
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