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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-id: <4868EB3B.1030608@sun.com>
Date:	Mon, 30 Jun 2008 10:18:35 -0400
From:	David Collier-Brown <davecb@....com>
To:	svaidy@...ux.vnet.ibm.com
Cc:	Tim Connors <tconnors@...ro.swin.edu.au>,
	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

Vaidyanathan Srinivasan wrote:
> I am trying to find answer to the question: Should we have the power
> saving tunable as 'nice' value per process or system wide?
> 
> How should we interpret the POWER parameter in a datacenter with power
> constraint as mentioned in this thread?  Or in a simple case of AC vs
> battery in a laptop.

I agree with Tim re setting them all independently, and suggest that 
they're all really per-process values: setting power saving 
system-wide is meaningful, but so are individual settings.
There is therefor an argument for making them subsets of
a higher-level nice program.

Mind you, the order in which one *implements* the capability,
and whether one does powernice first and adds it to nice later
is your call!  I have no idea of how hard what I suggested is (;-))

--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
bridge: (877) 385-4099 code: 506 9191#
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/