Re: [Dynamicpower-devel] About Policy Manager

[Scott E. P. <pr...@mo...>]

I think most systems using DPM have some kind of load-based policy
manager, which adjusts the system OP based on the total system load.
On an embedded system, with dedicated applications, it would be possible
to have a finer-grained policy manager that tied the system OP to the
specific use case or workload being run.  However, on a general-purpose
system, running an unconstrained workload, you're probably limited to
doing reactive power control based on watching the system load.

scott

| From: <zha...@bj...>
| 
| Thanks,Dave
| 
| I'm also in trouble with questions as follows:
| The new proc-fs interface can associate "op" with applications,but,if an
| application have many states,like a JAVA game,
| energy will be supplied when playing while going to sleep when not playing
| for a long time.Is there a way to deal with this?
| Another question,also take the JAVA game for example,users can get their
| preferred game from Internet or other sources.How can
| DPM manages these "Extended" applications which manufacturer has not
| specific their "op" at the factory?
| I think,if the core's load is heavy,it should switch to a more high speed
| "op",and to low speed "op" when is light automately and
| intelligently.Then,scaling the CPU's load is a problem.Any means can be
| used to achieve this?
| 
| Thanks and best wishes!
| 
| Barry
| Beijing,China
| 
| 
| Actually, the new version of DPM I'm working on now just does that.  You
| can
| set the operating point you want on a per process basis and any time that
| process is exec'd or context switched the associated operating point
| will be set by the kernel.
| 
| There is a new procfs interface to simply set the operating point for a
| process.
| It makes it very simple to associate operating points with specific
| applications on the system.
| 
| On embedded system where typically all the applications are installed
| at the factory the manufacturer knows which operating point they'd like
| for each process.
| 
| With the new interface they can set them at boot time and the system will
| handle all the operating state changes invisibly to the applications.
| 
| Dave
| 
| On 11/8/06, zha...@bj... <zha...@bj...>
| wrote:
| > I'm very interested in DPM for linux.After read the document-"Dynamic
| Power
| > Management for Embedded Systems V1.1" and the source file of DPM patch
| for
| > 2.6.16 kernel and pxa27x,a question comes to me:how can DPM manage the
| > applications up layer? Maybe the "sysfs" or "proc" interface can be
| > utilized. But,a optimal idea is that - DPM is transparent to all
| > applications.That is to say, we should realize the "Policy Manager"
| refered
| > by this document,but how? Leave the linux core monitoring the tasks
| > schedule and then trigger "operation point" switch?
| >
| > Thanks and best wishes!
| >
| >
| >
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| 
| 
| 
| 
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scott preece
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