linux-kernel - Re: [RFC][PATCH 02/22] sched: add extended scheduling interface

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Message-ID: <4CDB2340.2060501@sssup.it>
Date:	Wed, 10 Nov 2010 23:57:04 +0100
From:	Tommaso Cucinotta <tommaso.cucinotta@...up.it>
To:	Raistlin <raistlin@...ux.it>
CC:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chris Friesen <cfriesen@...tel.com>, oleg@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Claudio Scordino <claudio@...dence.eu.com>,
	michael trimarchi <trimarchi@...is.sssup.it>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Tommaso Cucinotta <cucinotta@...up.it>,
	Juri Lelli <juri.lelli@...il.com>,
	Nicola Manica <nicola.manica@...i.unitn.it>,
	Luca Abeni <luca.abeni@...tn.it>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Harald Gustafsson <hgu1972@...il.com>,
	paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 02/22] sched: add extended scheduling interface

Il 10/11/2010 23:17, Raistlin ha scritto:
>> I would suggest we add at least one more field so we can implement the
>> stochastic model from UNC, sched_runtime_dev or sched_runtime_var or
>> somesuch.
> Do we need some further mechanism to grant its
> extendability?
> Padding?
> Versioning?
> void *data field?
> Whatever?
This is a key point. Let me copy text from a slide of my LPC main-conf talk:

Warning: features & parameters may easily grow
- Addition of parameters, such as
     - deadline
     - desired vs guaranteed runtime (for adaptive reservations & 
controlled overcommitment)
- Set of flags for controlling variations on behavior
     - work conserving vs non-conserving reservations
     - what happens at fork() time
     - what happens on tasks death (automatic reclamation)
     - notifications from kernel (e.g., runtime exhaustion)
- Controlled access to RT scheduling by unprivileged
    applications (e.g., per-user “quotas”)
- Monitoring (e.g., residual runtime, available bandwidth)
- Integration/interaction with power management
    (e.g., spec of per-cpu-frequency budget)

How can we guarantee extensibility (or replacement) of parameters in the 
future ?

What about something like _attr_*() in POSIX-like interfaces ?

     T.

-- 
Tommaso Cucinotta, Computer Engineering PhD, Researcher
ReTiS Lab, Scuola Superiore Sant'Anna, Pisa, Italy
Tel +39 050 882 024, Fax +39 050 882 003
http://retis.sssup.it/people/tommaso

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