LTTng-UST, the Linux Trace Toolkit Next Generation Userspace Tracer, is
port of the low-overhead tracing capabilities of the LTTng kernel tracer
to user-space. The library "liblttng-ust" enables tracing of
applications and libraries.
Major new features:
- Per context filtering (vtid, vpid, procname) with e.g.
--filter 'procname=="apache2"'
- Buffers shared across applications with same user id e.g.
lttng enable-channel -u mychan --buffers-uid
- Implement --switch-timer and --read-timer options (periodical flush
and RT-awareness).
- Function entry/exit tracing (see lttng-ust-cyg-profile(3) manpage).
Release name: Cuda
Description (Cuda):
Brewed at the Benelux microbrewery, this IPA has huge floral, citric and
resinous hop aroma, simply an amazing nose. The flavor is very fresh
with a light caramel malting touch completing a strong body. Huge
amounts of hops, lots of grapefruit, lemon and oranges. This is an
outstanding IPA!
Changelog:
2013-03-28 lttng-ust 2.2.0-rc1
* Fix: tracepoint instrumentation constructor order issue
* Documentation: update 2.0 to 2.x
* Add demo test back as an example
* Don't rely on explicit context for filtering
* Implement per-context filtering
* Fix: filter string comparison should check for literal
* update tests/demo readme file
* Add man page for lttng-ust-cyg-profile
* Fix: filter string wildcard comparison
* Fix: Remove test runner script
* Fix: forwarding of call_site argument to field
* Add demo README
* Tests: Use Perl prove as the testsuite runner
* Remove tests depending on consumerd
* Convert hello.cxx test to a build test
* Clean-up of configure.ac and tests/Makefile.am
* Fix snprintf test and output result to TAP format
* Replace same_line_marker test with same_line_tracepoint
* Remove tests-libustinstr-malloc
* Remove exit-fast test
* Remove fork test
* Remove daemon test
* Remove demo test
* Remove outdated test-nevents test
* Remove outdated simple_include test
* Remove outdated register_test test
* Convert hello-static-lib test to a build test
* Convert hello test to a build test only
* Remove outdated libustctl_function_tests test
* Remove outdated test hello2
* Remove outdated dlopen test
* Remove outdated test basic long
* Remove outdated test basic
* cyg_profile: implement fast and verbose .so
* Performance: add unlikely to tracepoint dynamic linking test
* Fix: _LGPL_SOURCE rcu dereference fix
* Implement liblttng-ust-cyg-profile function entry/exit instrumentation
* Minor fix: libc wrapper internal run script
* Fix: ustctl_recv_register_event pointer mixup
* Fix: allow enabling same events for two channels
* Add channel ID field to attr
* Remove useless else clause
* tracepoint: move "probe" test outside of loop
* Fix uninitialized has_loglevel variable
* Fix clang warnings
* Cleanup: work-around clang unused result warning
* Cleanup compile warning
* Cleanup: remove unused variables
* tracepoint: Don't add NULL probes
* Remove mention of locking issues associated with dlopen usage
* Implement read timer (for RT)
* Only flush when there are readers active
* Add mutex for channel wakeup fd update
* Fix: fields should be initialized to NULL
* Implement ustctl_duplicate_ust_object_data
* Add channel wakeup fd to monitor close
* Fix: refcount issue in lttng-ust-abi.c
* Fix: only consumerd should print errors
* Implement ring buffer periodic buffer switch timer
* Fix: ensure all probe providers have their symbols
* Reactivate error printing
* Unregister tracepoint probes when not needed
* Cleanup: remove now unused metadata code from UST
* Fix: notification timeout logic
* Fix: don't print error in comm proto connect on ENOENT
* Fix: return expected error return values for sessiond
* Fix: set wait/wake fd to -1 before close
* Fix: Only notify socket should have timeout/nonblock
* Fix: ustctl: return -EPIPE to sessiond if connection is closed
* Fix: Add timeout on notification socket
* Remove now unused metadata printf code
* Move metadata creation into lttng-sessiond and lttng-consumed
* Add write metadata API to ust-ctl.h
* Move UST registry into sessiond and implement notifiers
* Fix: don't flush-final for offset 0 if reader is on sub-buffer
* Use tp rcu link test in provider
* Remove direct dependency of probes on urcu-bp
* Use urcu tls-compat.h
* Lazy provider registration
* Always use lttng_get_probe_list_head to get probe list
* Fix static build
* Move LTTng-UST buffer ownership from application to consumer
* Fix package: don't distribute generated headers
* Fix: don't cancel already exited threads
* Scalability fix: tracepoint.c hash table size increase
* Scalability fix for many events: event hash table size
* Speed up probe registration for large amount of events
* Add missing demo-trace shell script to dist tarball
* Documentation: add uuid package name for Fedora in README
* Fix: missing test for lttng_ust_comm_should_quit in lttng-ust-comm.c
* Add compilation support for Tile architectures
* Documentation: clarify debian package name for uuid in README
* Fix: comment in ust-ctl.h
* Fix I/O-related error values in ustctl
* Introduce hash table for lttng_create_event_if_missing()
* Fix: don't build C++ example if a C++ compiler isn't available
* Remove LIBFORMAT output in configure.
* Document dependency on libuuid
Project website: http://lttng.org
Download link: http://lttng.org/download
(please refer to the README file for installation instructions)
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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