Messages in this thread | | | Date | Tue, 28 Oct 2008 11:21:43 -0400 | From | Mathieu Desnoyers <> | Subject | Updated TODO list before releasing LTTng buffering to LKML |
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Hi everyone,
Thanks for the steady work those past weeks. We are close to a releasable result. I have been delighted to see people from Fujitsu helping on various items in the past weeks. Thanks to all those who report issues and/or provide patches.
Here is an updated Todo list before posting LTTng-buffering to LKML
Timestamping :
- Use kernel/time/tsc-sync.c in MIPS to detect unsync TSCs. - Tweak kernel/time/tsc-sync.c so it supports sync detection between two CPUs so it can be used to replace arch/x86/kernel/tsc_sync.c - I plan to leave the current cache-line bouncing time source for CPUs which have unsynched TSC, but to printk a warning telling the user to disabled freq. scaling and halt in idle to make sure the clocks are synchronized if he expects precise timestamping and good scalability to large number of nodes. Let's keep room for improvement on this aspect for later.
Markers :
- Tie the markers to event IDs and buffer name. That will permit to simplify a lot of stuff currently in ltt-marker-control.ko. It will also remove the need for a global event ID assignation, making it per-buffer (in LTTng terminology : per-channel). (will be done by myself soon)
- move ltt/ltt-marker-control.c /proc interface to debugfs I think we should integrate its directory tree to the new LTTng tracer debugfs API like this :
/debugfs/ltt/events/buffer_name/marker_name/ where we find files like : state write : 1/0 (on/off) read : 1/0 (on/off) format read : marker format string
(being done by Fujistsu)
LTTng tracer :
- Rip apart ltt/ltt-core.c and put it in ltt/ltt-tracer.c. This "builtin" part of LTTng can now sit in a module without any problem. This can be done because we have the markers to abstract all interactions with the tracer. (will be done by myself soon)
- switch ltt-control.ko (currently over netlink) to debugfs (being done by Fujistsu)
- Create a ltt-ascii.ko kernel module which merge-sorts the buffers and exports them to userspace through a debugfs file. (will be done by Fujistu)
- merge a simplified lttv in lttng (will be done by myself)
As always, feel free to indicate if you are willing to help on any of these items. If you need some pointers to the current state of work for a particular item, just ask and I'll give you the pointer to the patch within the -lttng git tree.
Thanks,
Mathieu
-- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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