The minutes of the weekly call fresh-off-the-oven can be found at:
https://wiki.linaro.org/WorkingGroups/PowerManagement/Meetings/2010-08-04
Attendees:
Linaro: Amit Kucheria, Amit Arora, Vishwanath Sripathy, Yong Shen
ARM: Srinivas Kalaga, Robin Randhawa
Action Items from this Meeting
* Action: Robin and Srinivas to send mail to team, to target the
ftrace patches for upstream.
* Action: Amit K to send email regarding power aware scheduling by
Intel (CONFIG_SCHED_MC & CONFIG_SCHED_SMT ?) Yes!
* ACTION: Yong Shen to test Amit Arora's powertop patches and
powerdebug tool.
* ACTION: Yong Shen to investigate plugging in cpufreq framework
for freescale boards
* ACTION: Amit Arora to creat a new wiki page for instructions on
how to setup your own git repo on git.linaro.org
* ACTION: Amit K to talk to jeremy about power domain framework
* ACTION: Amit Arora and Yong to discuss about reporting sensor
information (hwmon, or some other source for ARM?)
Action Items from Previous Meeting
* ACTIVE (Immediate):
o ACTION: Bobby to investigate android contraints (e.g.
display keep-alive): CLOSED
+ Bobby sent a mail. Considering closed.
o ACTION: Srinivas to add ftrace item to task list and send
patches to linaro: CLOSED
+ Srinivas has emailed the patches to team. Needed to
get time-stamps when system is entering low power state with various
workloads
o ACTION: Vishwa to create a new blue print for the
instrumentation of cpuidle related work: CLOSED
+ Blue print created and assigned to Vishwa.
o ACTION: Amit Arora to create tarballs of his current work
and share it internally for testing: CLOSED
+ considered done, git tree now available on git.linaro.org
o ACTION: Amit Kucheria and Vishwa to get inputs from
community on the issues related to CPUIDLE governor: POSTPONED until
instrumentation work
* ACTIVE (Long Term) :
o ACTION: Srinivas to provide details of where he believes
userspace - kernel interaction is required. (low prio)
o ACTION: Bobby to check on multi-core boards availability
(request open)
o ACTION: ARM to discuss giving out internal Eclipse based
tool (similar to powertop) (no ETA as of now)
* DORMANT :
o ACTION: ARM to share internal instrumentation flow (BAB:
we might also align with Linaro on workload discussions)
+ Might take couple of months
Minutes
* ftrace patches part of larger tool work inside ARM, perhaps the
ftrace patch doesn't need to wait for the entire tool and can be sent
upstream
* power aware scheduling using perf counters, cache misses/hits,
TLB hits/misses?
o ties into instrumentation work for cpuidle being done by Vishwa
* Discussion regarding power domain framework
o Similar to clock framework
o Does SRF replacement handle it? No, according to Vishwa.
* displaying sensors information - is it duplicating work done by
lm-sensors tool?
o figure out what drivers are using hwmon
o perhaps it would make sense to use the lm-sensor library
(is there any?) to grab this info?
* API to read performance counters
o arch/arm/kernel/pmu.h perf_event.c
o No documentation? (Perhaps we should provide docs?)
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