Hello
I just tried to configure the metadata channel for UST. After that I get
an error when listing the session.
Could someone please verify this? See below for the commands I used and
the error message.
Many thanks in advance!
Best Regards
Bernd
> lttng create
Session auto-20141020-141307 created.
Traces will be written in /home/bernd/lttng-traces/auto-20141020-141307
>lttng enable-channel --subbuf-size 8192 -u metadata
UST channel metadata enabled for session auto-20141020-141307
>lttng list auto-20141020-141307
Tracing session auto-20141020-141307: [inactive]
Trace path: /home/bernd/lttng-traces/auto-20141020-141307
=== Domain: UST global ===
Buffer type: per UID
Error: UST channel not found
Error: Command error
On 10/20/2014 01:26 PM, David Goulet wrote:
Greetings everyone (including LTTng bards!),
The lttng-tools project provides a session daemon (lttng-sessiond) that acts as
a tracing registry, the "lttng" command line for tracing control, a lttng-ctl
library for tracing control and a lttng-relayd for network streaming and live
reading.
This is the release candidate number 1 of version 2.6, code name: Gaia.
This features are listed below but here is a quick howto to use them. For the
MI feature, simply adds to the lttng command line the option "--mi xml". Only
XML is supported for now.
lttng --mi xml version
Note that there are now new lines for parsing efficiency. You can find the XML
schema in "src/common/mi_lttng.xsd". Big thanks to Jonathan Rajotte for this
great feature that the lttng bash completion file has already started using it!
Also, Java log4j support has been added as a new domain (like JUL) that you can
use with the command line option -l, --log4j and with the API using
LTTNG_DOMAIN_LOG4J.
Finally, it's now possible to do per syscall tracing. You can get a full list
of the available syscalls on your system with "lttng list -k --syscall". To
enable a syscall, use its name like so:
lttng enable-event -k --syscall connect
Note that it's not possible to choose the bitness of the syscall thus for
instance enabling "read" on a kernel supporting both 32 and 64 bit will enabled
both of them.
Of course, we fix a BUNCH of things that hopefully will make lttng tools more
stable and powerful :). Here is the ChangeLog entry for 2.6-rc1.
2014-10-20 lttng-tools 2.6.0-rc1 (Harry Belafonte records Banana Boat Song)
* Machine Interface added to lttng command line (--mi)
* Java Log4j agent support (--log4j)
* Kernel per syscall tracing
* Multiple fixes. A lot!
Please report ANY issues to bugs.lttng.org or on that mailing list.
Using it is testing it!
Project website: https://lttng.org
Download link:
https://lttng.org/files/lttng-tools/lttng-tools-2.6.0-rc1.tar.bz2
GPG sig: https://lttng.org/files/lttng-tools/lttng-tools-2.6.0-rc1.tar.bz2.asc
Cheers!
David
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