On Wed, Aug 25, 2010 at 3:11 PM, Amit Kucheria
<amit.kucheria@linaro.org> wrote:
The minutes of the weekly call can be found at:
https://wiki.linaro.org/WorkingGroups/PowerManagement/Meetings/2010-08-25
The minutes and actions are copied below.
Regards,
Amit
Attendees:
Linaro: Amit Kucheria, Amit Arora, Yong Shen
ARM: Robin Randhawa, Bobby Batacharia, Srinivas Kalaga
== Action Items from this Meeting ==
* ACTION: Yong to work with John Rigby and Ubuntu kernel team to make sure the Linaro kernel contains powertop kernel patches
* ACTION: Vishwa to verify powertop on 2.6.35
* ACTION: Vishwa to check with cpuidle/cpufreq experts in TI for verifying cpufreq behavior on multi-core OMAP
* ACTION: Amit A to get the powertop patch integrated into Linaro/Ubuntu packages
* ACTION: Yong to test common clk API patches on imx5 and help get it booting on babbage 3.0
== Action Items from Previous Meeting ==
* ACTIVE (Immediate):
* ACTION: Amit A to test on pm enabled OMAP3 board: DONE on 2.6.32 on zoom3 board
* New ACTION: Vishwa to verify on 2.6.35
* ACTION: Amit A to document details on power supply class (battery info) to PowerTOP internal wiki page: DONE
* ACTION: Yong to look into getting powertop kernel patches applied to Linaro kernel tree: Not DONE
* New ACTION: Yong to work with John Rigby and make sure the Linaro kernel contains it
* ACTION: Robin to send links to patches sent to linux-pm: DONE
* http://www.spinics.net/lists/cpufreq/msg01740.html
* It was a pointer to a discussion on having different governors on different cores
* ACTION: Amit K to spend some time on usecase to reproduce ondemand governor problems: POSTPONED
* ACTION: Yong to look at common clock FW, find out if debug info being exported (usage count, clk rate, dependencies): DONE
* DORMANT :
* ACTION: ARM to share internal instrumentation flow (BAB: we might also align with Linaro on workload discussions)
* Might take couple of months
* ACTION: Amit K to talk to jeremy about power domain framework: DONE
* Jeremy needs help, will revisit in a few weeks
* ACTION: Srinivas to provide details of where he believes userspace - kernel interaction is required. (low prio)
* ACTION: Bobby to check on multi-core boards availability (request open)
* ACTION: ARM to discuss giving out internal Eclipse based tool (similar to powertop) (no ETA as of now)
* ACTION: Amit Kucheria and Vishwa to get inputs from community on the issues related to CPUIDLE governor: POSTPONED until instrumentation work
== Minutes ==
* Discussion on http://www.spinics.net/lists/cpufreq/msg01740.html
* For ARM, both cores run at same frequency (CMP)
* Does it make sense for them to run different governors on each core?
* The consensus currently is NO
* TI uses ondemand governor + policy manager
* One core is kept OFF, all processing happens on the other one.
* If load on one core goes above a threshold, they turn ON other core
* Both cores run at same Operating Point once ON
* Debug info in common clk API being discussed upstream by Jeremy
* There is currently no debug info
* clock name is not part of the common struct clk to keep size down
* Need to engage with Jeremy
* Yong will test the patches from Jeremy on imx5 and report back
* Powerdebug: should we visualise the clock and power dependencies using information from /sys or debugfs?
* No immediate horror expressed at the idea
* Freescale and TI already do it to a certain extent by dumping the clock tree and rates into a table
* The entire tree is too complex to depict
* We could represent it in parts e.g. start at a peripheral and plot it's clock and power dependencies all the way up
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