http://defect.opensolaris.org/bz/show_bug.cgi?id=7429
Summary: cpufreq.c DTrace scripts should be compatible with pre-
PAD kernels
Classification: Development
Product: power-mgmt
Version: unspecified
Platform: ANY/Generic
OS/Version: OpenSolaris
Status: ACCEPTED
Severity: minor
Priority: P4
Component: powertop
AssignedTo: rafael.vanoni at sun.com
ReportedBy: rafael.vanoni at sun.com
CC: tesla-dev at opensolaris.org
The Power Aware Dispatcher project changed the SDT cpu-change-speed probe's
arguments to facilitate it's utilization. This change resulted in an update to
PowerTOP's cpufreq.c scripts, bringing it up to speed with the probe's new
arguments.
However, pre-PAD snv kernels as well as Solaris 10 FCS to Update 7 have the old
probe prototype and will break if the script is updated without adding support
to previous versions of that probe. This is currently not a problem because:
(a) PowerTOP doesn't ship with any S10 update, the users can only use the tool
through the SVR4 package available at the website. The current package still
uses the old probe prototype.
(b) PowerTOP's development repo hasn't caught up with PAD, so it is also using
the old probe arguments.
This RFE suggests the introduction of some sort of versioning mechanism to
avoid breakeages due to different probe prototypes.
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