linux-kernel - Re: [RFC 10/12][PATCH] SCHED_DEADLINE: group bandwidth management code

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]

Date:	Wed, 13 Jan 2010 10:46:54 +0100
From:	Raistlin <raistlin@...ux.it>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	michael trimarchi <michael@...dence.eu.com>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	Chris Friesen <cfriesen@...tel.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Henrik Austad <henrik@...tad.us>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Sven-Thorsten Dietrich <sven@...bigcorporation.com>,
	Claudio Scordino <claudio@...dence.eu.com>,
	Tommaso Cucinotta <tommaso.cucinotta@...up.it>,
	"giuseppe.lipari" <giuseppe.lipari@...up.it>,
	Juri Lelli <juri.lelli@...il.com>
Subject: Re: [RFC 10/12][PATCH] SCHED_DEADLINE: group bandwidth management
 code

On Mon, 2009-12-28 at 15:51 +0100, Peter Zijlstra wrote:
> On Fri, 2009-10-16 at 17:46 +0200, Raistlin wrote:
> > CPU Container Groups support for SCHED_DEADLINE is introduced by this commit.
> > 
> > CGroups, if configured, have a SCHED_DEADLINE bandwidth, and it is enforced
> > that the sum of the bandwidths of entities (tasks and groups) belonging to
> > a group stays below its own bandwidth.
> 
> No real comment on the code here, but since we have a deadline bandwidth
> reservation, should we not also couple to the existing rt (fifo)
> bandwidth reservation?
> 
> We can't after all guarantee the FIFO time if there's deadline
> reservations around for more.
> 
Mmm... If I'm getting this right, you're suggesting to decrease from the
available system rt-bandwidth the bandwidth devoted to deadline
scheduling.

This make more than sense to me... I'll think about how to make the code
reflect that.

Thanks and regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
----------------------------------------------------------------------
Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa  (Italy)

http://blog.linux.it/raistlin / raistlin@...ga.net /
dario.faggioli@...ber.org

Download attachment "signature.asc" of type "application/pgp-signature" (198 bytes)