[ltt-dev] [RELEASE] LTTng 0.183/0.183o

[Mathieu Desnoyers]

* Mathieu Desnoyers (mathieu.desnoyers at polymtl.ca) wrote:
> * Mathieu Desnoyers (mathieu.desnoyers at polymtl.ca) wrote:
> > Hi !
> > 
> > I just released LTTng 0.182 for mainline kernel 2.6.32. It fixes ppc440
> > build and, more importantly, adds full support for ARM omap3 to the
> > trace clock:
> > 
> > - Power management support (suspend/resume, idle)
> > - DVFS support
> > 
> > Basically, the infrastructure is based on the 32k timer as external
> > time source, but uses the ccnt register to read the time base quickly at
> > each event. The trace clock is responsible for extending the 32-bit
> > counter to 64-bit, and for resynchronizing it on the 32k clock when
> > necessary.
> > 
> > I did all development and testing of the omap3 features on top of a
> > linux-omap-2.6 2.6.32-rc8 kernel and then reintegrated the patches in
> > the main LTTng tree. I only build-tested the port to main LTTng tree.
> > 
> > I should put the linux-omap-2.6-lttng tree online shortly, along with
> > the corresponding patchset.
> 
> .. and the corresponding patchset and git tree for the omap/pm tree,
> based on kernel 2.6.32-rc8:
> 
> git://lttng.org/linux-omap-pm-2.6-lttng.git
> 
> http://lttng.org/files/lttng/patch-omap-pm-2.6.32-rc8-lttng-0.182o.tar.bz2
> 
> (it is actually a mix of lttng 0.180 to 0.182).

Version 0.183/0.183o turns the periodic resync timer into a timer only
launched when actual DVFS frequency change occurs (it is used to ensure
very frequent DVFS freq. change do not generate a high rate of 32k clock
reads).

Also, I don't want to take any chance, and therefore don't assume the
ccnt register is stopped in idle. This version now additionally makes
sure to stop the ccnt register when going to idle/sleep.

Mathieu


> 
> Have fun !
> 
> Mathieu
> 
> > 
> > Feedback is welcome !
> > 
> > Thanks,
> > 
> > Mathieu
> > 
> > -- 
> > Mathieu Desnoyers
> > OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
> > 
> > _______________________________________________
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> > ltt-dev at lists.casi.polymtl.ca
> > http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
> > 
> 
> -- 
> Mathieu Desnoyers
> OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
> 
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-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68