LTTV & LTTng roadmap

Here are the roadmaps for the LTTV and LTTng development. I use a priority indice for the TODO items :
(1) : very high priority
(10): lowest priority


Dependencies are written between brackets [ ].
The # symbol marks who is currently working on the item.
The % symbol marks who is interested in the realisation of the item.

LTTV Roadmap

* TODO
(3) Make LTTV aware of type formats (visual separators) defined in the XML file.
(3) Use a per architecture enumeration for traps.
(4) Add event specific fields support to filter.
(4) Add a periodic event interval view. (useful to verify event periodicity)
(4) create a graphical per cpu activity view.
(5) Add Python scripting hooks.
(5) Flight recorder : start lttd automatically upon GUI trace control stop.
(5) Automatically detect traces with too much processes and disable faulty operations.
(5) Event sequence detector (inspired from regular expressions).
(7) Create a hardware counter viewer (low cost rate counters : L1 cache miss, page faults, interrupts...). This will be a generalisation of the event rate view into a view of the evolution of a user definable event field.
(10) Add cancel button to LTTV filter GUI window.

LTT Next Generation Roadmap

* TODO
(4) Add Xen support.
# Mathieu Desnoyers
# Parisa Heidari
(4) efficient dynamic event filtering while recording trace.
% Sensis Corp. Tim Bish
(4) instrument kernel bottom half irqsave, spinlocks, rwlocks, seqlocks, semaphores, mutexes, brlock.
(4) integrate NPTL instrumentation (see PTT).
(5) Support CPUs with scalable frequency.
(5) Integrate LTTng and lttd with LKCD.
(7) Integrate periodical dump of perfctr hardware counters.
(8) Integrate periodical dump of SystemTAP computed information.
(8) Integrate SystemTAP logging with LTTng.
(9) Add support for setjmp/longjmp and jump tables instrumentation to ltt-instrument-functions.
(9) Make ltt-usertrace-fast support internal heartbeat timer.
(3) port LTTng to :
x86_64
#Autodesk Francois L'Archeveque for 2.6.9 RedHat Enterprise (patch available in contrib, still has to be ported to 2.6.14, thanks!)
#Wind River for 2.6.14
PPC
PPC64
#Wind River for 2.6.14
%IBM
alpha
user-mode Linux
Xen
MIPS
MIPS64
#Mathieu Desnoyers
%Wind River for 2.6.14
S/390



* TODO (low priority)
enhance RPM packages for lttng kernel
Integrate header generation (genevent) in kernel build system.
Find a different way to printk from instrumentation : forbidden from schedule and wakeup (causes a deadlock). -> Modify printk so it uses LTTng tracer!
Export channels via network sockets instead of writing them to disk.
Export buffers with time constraint for "live" visualisation. Use ltt_force_switch periodically from a timer to insure slow channels do not interfere with viewing.
Have an optional round-robin mode to write information into multiple channels from the same source.

* Need to be discussed
Use 2.6.14 RelayFS control files.
Drop ltt-module-register and ltt-module-unregister, use exported variables.
drop ltt_filter_control, use functions pointers instead.
Merge facilities headers into one big header.
Change the name of XML files from XML to something else.
Remove ltt-base.c.


* lttng patch division (0.5.10+) :

instrumentation.diff
instrumentation-arm.diff
instrumentation-i386.diff
instrumentation-mips.diff
instrumentation-powerpc.diff
instrumentation-ppc.diff
instrumentation-s390.diff
instrumentation-sh.diff
ltt-facilities-headers.diff
ltt-facilities-loader.diff
ltt-facilities.diff
ltt-relayfs.diff
ltt-core.diff
ltt-build.diff


Mathieu Desnoyers