<s>
LTTng	B-Application
(	O
Linux	B-Application
Trace	I-Application
Toolkit	I-Application
:	O
next	O
generation	O
)	O
is	O
a	O
system	B-Application
software	I-Application
package	O
for	O
correlated	O
tracing	O
of	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
applications	O
and	O
libraries	O
.	O
</s>
<s>
Its	O
predecessor	O
is	O
the	O
Linux	B-Application
Trace	I-Application
Toolkit	I-Application
.	O
</s>
<s>
LTTng	B-Application
uses	O
the	O
Tracepoint	B-Application
instrumentation	O
of	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
as	O
well	O
as	O
various	O
other	O
information	O
sources	O
such	O
as	O
kprobes	O
,	O
and	O
the	O
Perf	B-Application
performance	O
monitoring	O
counters	O
.	O
</s>
<s>
The	O
challenging	O
problems	O
traceable	O
with	O
LTTng	B-Application
include	O
,	O
for	O
example	O
,	O
performance	O
problems	O
on	O
parallel	O
systems	O
and	O
on	O
real-time	O
systems	O
.	O
</s>
<s>
LTTng	B-Application
consists	O
of	O
kernel	B-Operating_System
modules	O
(	O
for	O
Linux	B-Operating_System
kernel	I-Operating_System
tracing	O
)	O
and	O
dynamically	O
linked	O
libraries	O
(	O
for	O
application	O
and	O
library	O
tracing	O
)	O
.	O
</s>
<s>
It	O
is	O
controlled	O
by	O
a	O
session	O
daemon	O
,	O
which	O
receives	O
commands	O
from	O
a	O
command	O
line	O
interface	O
,	O
lttng	B-Application
.	O
</s>
<s>
The	O
Babeltrace	B-Application
project	O
allows	O
translating	O
traces	O
into	O
a	O
human-readable	O
log	O
,	O
and	O
provides	O
a	O
trace	O
reading	O
library	O
,	O
libbabeltrace	O
.	O
</s>
<s>
LTTng	B-Application
is	O
available	O
as	O
a	O
set	O
of	O
packages	O
.	O
</s>
<s>
LTTng	B-Application
has	O
at	O
least	O
basic	O
support	O
for	O
all	O
Linux-supported	O
architectures	B-General_Concept
(	O
see	O
the	O
LTTng-modules	O
README	O
file	O
for	O
more	O
details	O
)	O
as	O
well	O
as	O
support	O
for	O
FreeBSD	B-Operating_System
.	O
</s>
<s>
Major	O
users	O
include	O
Google	B-Application
,	O
IBM	O
,	O
Autodesk	O
,	O
Siemens	O
,	O
Nokia	O
,	O
Sony	O
and	O
Ericsson	O
.	O
</s>
<s>
It	O
is	O
included	O
in	O
Wind	O
River	O
Workbench	O
,	O
Mentor	O
Graphics	O
Mentor	O
Embedded	O
Linux	B-Application
,	O
ELinOS	B-Application
embedded	O
Linux	B-Application
,	O
MontaVista	B-Operating_System
Mobilinux	O
5.0	O
,	O
STLinux	O
and	O
SUSE	O
Linux	B-Application
Enterprise	O
Real-Time	O
Linux	B-Application
distributions	O
.	O
</s>
<s>
Once	O
collected	O
,	O
multiple	O
solutions	O
exist	O
to	O
process	O
and	O
visualize	O
LTTng	B-Application
trace	O
data	O
(	O
kernel	B-Operating_System
and	O
userspace	O
)	O
such	O
as	O
the	O
open-source	O
LTTV	O
viewer	O
,	O
Eclipse	B-Application
Trace	O
Compass	O
or	O
commercial	O
tools	O
such	O
as	O
Mentor	O
Graphics	O
 '	O
Sourcery	O
Analyzer	O
and	O
Percepio	O
Tracealyzer	O
.	O
</s>
<s>
LTTng-modules	O
,	O
LTTng-UST	O
,	O
LTTng-tools	O
and	O
Babeltrace	B-Application
are	O
actively	O
developed	O
by	O
an	O
open	O
community	O
.	O
</s>
