linux-kernel - Re: [RFC][PATCH] Multimedia scheduling class, take 2

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Message-ID: <4A099670.5060902@nortel.com>
Date:	Tue, 12 May 2009 09:32:00 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Jussi Laako <jussi@...arnerd.net>
CC:	Peter Zijlstra <peterz@...radead.org>,
	James Courtier-Dutton <James@...erbug.co.uk>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	d.faggioli@...up.it
Subject: Re: [RFC][PATCH] Multimedia scheduling class, take 2

Jussi Laako wrote:
> Peter Zijlstra wrote:
> 
>>As to the patch, I still think its an exceedingly bad idea to create
>>such a horridly ill defined scheduler class. There's nothing that keeps
>>people from stuffing everything in there and either generating DoS
>>issues or still generating bad interactivity.
> 
> 
> Lite patch practically exports nice levels as scheduling priorities in
> order to make it possible to assign different levels to different
> threads of the same process.

If all you're trying to do is allow different threads to run at
different nice levels, what about extending sys_setpriority() to take a
"which" of PRIO_THREAD?  We'd probably have to call the syscall directly
until/unless libc picks up the new option.

Chris
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