linux-kernel - Re: [RFC][PATCH 00/16] sched: SCHED

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Date:	Sat, 07 Apr 2012 16:25:31 +0700
From:	Tadeus Prastowo <tadeus.prastowo@...h-aachen.de>
To:	Luca Abeni <luca.abeni@...tn.it>
Cc:	Juri Lelli <juri.lelli@...il.com>, peterz@...radead.org,
	tglx@...utronix.de, mingo@...hat.com, rostedt@...dmis.org,
	cfriesen@...tel.com, oleg@...hat.com, fweisbec@...il.com,
	darren@...art.com, johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...csson.com, liming.wang@...driver.com
Subject: Re: [RFC][PATCH 00/16] sched: SCHED_DEADLINE v4

Hi everyone!

On Fri, 2012-04-06 at 10:25 +0200, Luca Abeni wrote:

[...]

> About BWI... A student of mine (added in cc) implemented a prototypal
> bandwidth inheritance (based on an old version of SCHED_DEADLINE). It is
> here:
> https://github.com/eus/cbs_inheritance
> (Tadeus, please correct me if I pointed to the wrong repository).

The repository is correct.

> It is not for inclusion yet (it is based on an old version, it is UP
> only, and it probably needs some cleanups), but it worked fine in our
> tests. Note that in this patch the BWI mechanism is not bound to
> rtmutexes, but inheritance is controlled through 2 syscalls (because we
> used BWI for client/server interactions).
> Anyway, I hope that the BWI code developed by Tadeus can be useful (or
> can be directly re-used) for implementing BWI in SCHED_DEADLINE.

For inclusion, I think the interaction between the two system calls and
RT-mutex subsystem needs some thoughts especially when multi-cores are
involved. I haven't given further thought on this matter upon the
completion of my thesis work, especially in taking into account Dario's
M-BWI approach.

For UP, the BWI syscalls implementation in the aforementioned branch
does not have Dario's BWI implementation for mutexes. And interaction
between the BWI syscalls and RT-Mutex has not been taken into account.

Happy Easter to all of you who celebrate it!

> 				Luca

-- 
Sincerely yours,
Tadeus Prastowo

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