linux-kernel - Re: [RFC v1] Tunable sched_mc_power

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Date:	Sun, 29 Jun 2008 14:02:58 -0400
From:	David Collier-Brown <davecb@....com>
To:	Tim Connors <tconnors@...ro.swin.edu.au>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>, dipankar@...ibm.com,
	balbir@...ux.vnet.ibm.com,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Vatsa <vatsa@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: Re: [RFC v1] Tunable sched_mc_power_savings=n

Andi Kleen <andi@...stfloor.org> said on Fri, 27 Jun 2008 00:38:53 +0200:
>>Peter Zijlstra wrote:
>>>>And your workload manager could just nice processes. It should probably
>>>>do that anyways to tell ondemand you don't need full frequency.
>>>
>>>Except that I want my nice 19 distcc processes to utilize as much cpu as
>>>possible, but just not bother any other stuff I might be doing...
>>
>>They already won't do that if you run ondemand and cpufreq. It won't
>>crank up the frequency for niced processes.


Tim Connors then wrote:
> Shouldn't there be a powernice, just as there is an ionice and a nice?
Hmmn, how about:

User Commands                                             nice(1)

NAME
     nice - invoke a command with an altered  priority

SYNOPSIS
     /usr/bin/nice [-increment | -n increment]  [-s|-i|-e|-p] command  [argu-
     ment...]

DESCRIPTION
     The nice utility invokes command, requesting that it be  run
     with a different  priority.  If -i is specified, the priority
     of (disk) I/O is modified. If -e is specified, ethernet (or
     other networking) priority is changed. If -p is specified, power
     usage priority is changed and if  -s is specified, or none 
     of -1, -e or -p  is specified, then system scheduling priority
     is modified...

--dave
-- 
David Collier-Brown            | Always do right. This will gratify
Sun Microsystems, Toronto      | some people and astonish the rest
davecb@....com                 |                      -- Mark Twain
(905) 943-1983, cell: (647) 833-9377, (800) 555-9786 x56583
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