Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 10 Jan 2024 15:29:27 -0500 | From | Mathieu Desnoyers <> | Subject | [RELEASE] LTTng-UST 2.12.9 and 2.13.7 (Linux user-space tracer) |
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LTTng-UST, the Linux Trace Toolkit Next Generation Userspace Tracer, is a low-overhead application tracer. The library "liblttng-ust" enables tracing of applications and libraries.
* New and noteworthy in these releases:
Specific to 2.13.7, a fix for misaligned urcu reader accesses was introduced. It only applies to the lttng-ust 2.13 branch because it implements its own "lttng-ust-urcu" flavor.
Also specific to 2.13.7, "sync" vs "unsync" enablers are introduced to eliminate an O(n*m) algorithm:
Eliminate iteration over unmodified enablers when synchronizing the enablers vs event state.
The intent is to turn a O(m*n) algorithm (m = number of enablers, n = number of event probes) into a O(n) when enabling many additional events when tracing is active.
Specifically in 2.12.9, the rfork() wrapper is fixed: it was not passing the flags arguments. This was fixed in a larger commit in the master and stable-2.13 branches.
Both stable branches include:
- a build system fix for documentation examples with old autoconf when used with a relative path.
- a clang warning fix around volatile qualifier on function pointers.
- Python agent uplift to adapt to modern python (>= 3.10),
- a possible race condition in the ustfork helper.
Enjoy!
Mathieu
Project website: https://lttng.org Documentation: https://lttng.org/docs Download link: https://lttng.org/download
Detailed change logs:
2024-01-10 (National Houseplant Appreciation Day) lttng-ust 2.13.7 * fix: invoke MKDIR_P before changing directories * fix: -Wsingle-bit-bitfield-constant-conversion with clang16 * fix: clean java inner class files in examples * Introduce sync vs unsync enablers * Fix: misaligned urcu reader accesses * ustfork: Fix warning about volatile qualifier * ustfork: Fix possible race conditions * Fix: tracepoint: Remove trailing \ at the end of macro * fix: python agent: use stdlib distutils when setuptools is installed * fix: python agent: install on Debian python >= 3.10 * fix: python agent: Add a dependency on generated files * python: use setuptools with python >= 3.12
2024-01-10 (National Houseplant Appreciation Day) lttng-ust 2.12.9 * fix: invoke MKDIR_P before changing directories * fix: clean java inner class files in examples * ustfork: Fix warning about volatile qualifier * ustfork: Fix possible race conditions * Fix: FreeBSD: Pass flags arguments to rfork wrapper * fix: python agent: use stdlib distutils when setuptools is installed * fix: python agent: install on Debian python >= 3.10 * fix: python agent: Add a dependency on generated files * python: use setuptools with python >= 3.12
-- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com
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