[ltt-dev] LTTng 0.51, improved timestamping
compudj at krystal.dyndns.org
Thu Nov 6 08:10:34 EST 2008
disable tsc synth when ! trace clock ?
tsc synth get/put ?
- single cpu -> tsc_is_sync : no force on unstable tsc ?
- hotplug out all cpus, recheck
* Mathieu Desnoyers (compudj at krystal.dyndns.org) wrote:
> LTTng 0.51 for 18.104.22.168 does the following :
> It improves timestamping on architectures with non-synchronized TSCs in
> LTTng 0.51. I also now use per-cpu timers to do some time-related stuff
> I previously used IPIs for. It involves being more closely tied to the
> CPU hotplug callbacks.
> I also replaced x86 tsc_sync.c test by LTTng architecture independent
> test. (this will be posted separately on LKML for 2.6.28-rc3 tomorrow
> along with the "tracer clock" patchset).
> The event trap_entry, syscall_entry, irq_entry, softirq entry, exit and
> raise now use smaller fields (2 bytes), which should be enough to encode
> the IDs for all architectures. This will principally make a difference
> with non-aligned tracing for most of those events.
> Mathieu Desnoyers
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