[lttng-dev] [RELEASE] LTTng-UST 2.9.0-rc1 "Joannès" (Linux user-space tracer)
Mathieu Desnoyers
mathieu.desnoyers at efficios.com
Sat Oct 8 13:47:20 UTC 2016
----- On Oct 7, 2016, at 4:05 PM, Mathieu Desnoyers mathieu.desnoyers at efficios.com wrote:
> We are proud to announce release candidate 1 of LTTng-UST 2.9.0.
> Please test it within the coming month, and let us know if anything
> goes unexpectedly before we proceed to the final release.
>
> 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 for 2.9.0-rc1:
>
> * Various performance improvements. Tested on x86-64 and ARM32.
> * New liblttng-ust-fd helper library to deal with daemon applications
> closing file descriptors that don't belong to them, e.g. loop
> closing file descriptors after fork, or BSD closeall().
> * Introduce library load/unlock tracking events, which is more
> precise than the dlopen/dlmopen/dlclose instrumentation we had
> in lttng-ust 2.8 in cases where a dlopen'd library loads its
> own dependencies.
> * Tracepoints: new payload types supported: array and sequences of
> integers in network byte order,
> * Documentation (man pages) overhaul,
> * Added support for ARM64 "aarch64_be" for some toolchains,
> * Added "-ust" suffix to lttng-ust thread names,
> * Introduce lttng_ust_loaded weak symbol, meant to allow applications
> to detect whether lttng-ust is dynamically loaded,
One more noteworthy new feature: perf counters contexts can now be used
across all architectures supported by Perf. We use a read()
system call on a perf file descriptor as fallback. It is slower,
but works everywhere.
Thanks,
Mathieu
>
> Project website: http://lttng.org
> Documentation: http://lttng.org/docs
> Download link: http://lttng.org/download
>
> The 2.9 release "Joannès" is named after a Berliner Weisse style
> beer from the Trèfle Noir microbrewery in Rouyn-Noranda.
>
> Changelog:
>
> 2016-10-07 (National Frappé Day) lttng-ust 2.9.0-rc1
> * Fix: cmake example with configure based oot build
> * Fix: perform statedump before replying to sessiond
> * build: check for CXX_WORKS for cmake example
> * Implement liblttng-ust-fd
> * Introduce file descriptor tracker
> * Fix: honor send timeout on unix socket connect
> * Fix: perform TLS fixup in all UST entry points from each thread
> * Fix: build: pass configure flags to cmake example
> * Performance: implement lttng_inline_memcpy
> * Performance: mark ring buffer do_copy callers always inline
> * Performance: cache the backend pages pointer in context
> * Add ctx_len field to ring buffer context
> * ring buffer: handle shmp errors
> * Cleanup: libringbuffer: remove duplicate shmp() invocations in slow paths
> * Performance: Only dereference shmp once
> * Performance: Mark channel and buffer event disabled check unlikely
> * Performance: Relax atomicity constraints for crash handling
> * Fix: compat: -ust suffix sprintf error handling
> * Performance: disable event counting by default
> * Fix: remove unlock in getcpu
> * Performance: remove rcu read lock from ring buffer get/put cpu
> * Performance: define _LGPL_SOURCE in LGPL c files
> * Performance: split check deliver fast/slow paths
> * Fix: perf counters build against kernel headers < 3.12
> * Fix: perf counter context deadlock
> * Fix: many-events registration/unregistration speed
> * Fix: pre-fault TLS in ust-malloc instrumentation
> * Fix: ust-ctl: use LTTNG_UST_HAVE_PERF_EVENT to report perf counter
> availability
> * Fix: reset vtid cache before releasing urcu locks
> * Fix: cleanup local_apps.allowed flag on lib cleanup
> * Fix: Correctly handle invalid agent port file
> * Fix: memory corruption in compat.h
> * Introduce lttng_ust_loaded weak symbol
> * Revert "Introduce LTTNG_UST_LOADED environment variable"
> * Introduce LTTNG_UST_LOADED environment variable
> * Fix: remove invalid free
> * Use AC_PROG_MKDIR_P (generic mkdir -p)
> * Split CMake example build steps on different lines
> * Fix: CMake example: specify source/built includes/libs
> * configure: allow building perf support across all architectures
> * Fix: use-after-free in statedump lib iter_end
> * Add generic fallback for perf counter read
> * Fix: perf counters: sign-extend pmc register
> * doc: Add flags for JUL and python agent compiling
> * tests/hello.cxx: add ctf_enum_auto() entries
> * Add ctf_enum_auto() for autoincrementing enumeration values
> * Add missing ust_lib.c and ust_lib.h
> * dl instrumentation: add dlmopen event, trace dlopen flags
> * Add library load/unload tracking events
> * Communication protocol: use fixed-size integer rather than enum
> * Add ustctl command to regenerate the statedump
> * Implement statedump command in UST
> * tests/hello.cxx: add enumeration field
> * Fix: ctf_enum_value() does not work with g++
> * Fix: lttng context perf: missing stdbool.h header include
> * Add perf context support for ARMv7
> * Keep perf context FD open for other architectures
> * Doc: cmake example: fix coding style
> * Doc: ship cmake example with 'make distcheck'
> * Doc: add CMake example
> * configure.ac: check cmake availability
> * Only build python lib when agent is enabled
> * doc: information has no plural
> * Fix: allow non-LGPL modules to use tracepoints
> * Add -ust to the name of UST threads of the application
> * Comment the locking mechanisms in ContextInfoManager
> * Fix: Null-check return value of log4j.Category.getAllAppenders()
> * Add liblttng-ust-agent.jar to the .gitignore
> * Fix: Specify encoding when reading agent port file
> * Fix: Include child loggers in the output of "lttng list"
> * Fix: Handle both agent config files pointing to same port
> * Suppress static method warning
> * Add more logging to the LttngTcpSessiondClient
> * Use config.h to detect sched_getcpu support
> * Fix: use limits.h in ust-elf test
> * Fix: strerror_r behavior is glibc specific
> * Add support for musl libc to ust-dlfcn.h
> * Fix: don't generate 0-len array in tracepoint probes
> * Fix: log4j example: set logger level to prevent unexpected level inheritance
> * Fix: no LGPL define for malloc and pthread wrappers
> * Fix: all lttng-ust source files should be tagged _LGPL_SOURCE
> * Fix: initialize RCU callbacks with mixed LGPL/non-LGPL objects
> * Fix: incorrect structure layout with mixed LGPL/non-LGPL objects
> * Fix: don't call __builtin_return_address(0) on 32-bit powerpc
> * Update version name TBD
> * Update version to 2.9.0-pre
> * Fix: tracepoint header: declare tracepoint_dlopen_ptr
> * Fix: update debug message about weak-hidden symbols
> * Fix: tracepoint-rcu header: use tracepoint_dlopen_ptr
> * Fix: test: relax requirement on weak-hidden symbol address
> * Fix: work-around gcc optimisation oddness on 32-bit powerpc
> * Fix: test weak-hidden symbols
> * Print DBG() message about compiler weak hidden symbol behavior
> * test: add test for gcc issue with weak hidden symbol on powerpc
> * Restrict Java context retriever names to a set of valid characters
> * Fix: Correctly compute Java agent list loggers response size
> * Add support for aarch64_be
> * Fix: Fix synchronization of LTTngAgent#dispose
> * Fix: Verify number of bytes contained in sessiond agent commands
> * Fix: Avoid potential null dereference with log4j loggers
> * Specify UTF-8 encoding for all Java agent commands
> * Fix: merge tap tests stdout and stderr
> * Documentation: ring buffer: SWITCH_FLUSH can be used when active
> * Fix: unchecked return value in trace_clock_read64_monotonic
> * Fix: portability: no arith on void pointer
> * Fix: initialize build id and debug link flags to 0
> * Tests: Add tap-driver.sh for automake < 1.12
> * Fix: add "has_build_id" and "has_debug_link" fields to debuginfo events
> * Tests: Replace prove by autotools tap runner
> * bootstrap: Standardize on autoreconf -vi
> * Harmonize bootstrap script across projects
> * lttng-ust(3): order environment variables
> * lttng-ust(3): fix syntax of env. variables section
> * lttng-ust(3): document $LTTNG_HOME
> * Fix: Java agent should use LTTNG_HOME
> * Fix: examples make distcheck failure
> * Cleanup: add static for internal symbols
> * Cleanup: Remove unused max() macros from ring_buffer_frontend.c
> * Use min_t/max_t macros in lttng-ust-elf.c
> * Tests: update ust-elf tests to reflect correct memsz computation
> * Fix: erroneous computation of ELF in-memory size
> * Make code and man pages share the same default values
> * Fix: remove NULL check of nonnull parameter in dlclose
> * Tracepoint array/sequence: add nowrite hex macros
> * Tracepoint: add ctf array for network byte order integers
> * Tracepoint: add ctf sequence for network byte order integers
> * Fix: endianness of integers received by filter
> * Doc: Update README.md
> * Fix: jul and log4j agents makefile missing line and indentation
> * Fix: re-introduce exported symbols
> * Doc: update manpages for soinfo/sopath name change
> * Rename statedump and dl events and fields
> * Tests: list ust-elf test data explicitly in EXTRA_DIST
> * Tests: add tests for lttng_ust_elf_is_pic
> * Add is_pic field to statedump soinfo event
> * Fix: add common jar to lttng-ust-agent-all dependencies
> * Fix: add version to lttng-ust-agent-all jar file
> * Fix: rename liblttng-ust-agent to lttng-ust-agent-all
> * Fix: re-add liblttng-ust-agent.jar
> * Fix: lttng java agent: dispose is non-static
> * doc/man: do not use macros in the NAME section
> * doc/man: remove duplicate copyrights section
> * doc/man: lttng-ust(3): add tracing control to example
> * doc/man: lttng-ust(3): split example files in subsections
> * doc/man/common-copyrights: add missing THANKS section
> * doc/man: lttng-ust(3): add missing ENVIRONMENT VARIABLES section
> * README.md: bolden dependencies and update links
> * README.md: split required and optional dependencies
> * Convert man pages to AsciiDoc
> * Fix: remove dead code from filter interpreter
> * Fix: convey enum value signedness into metadata
>
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com
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--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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