linux-kernel - Re: [PATCH] scheduler: introduce SCHED_RESET_ON

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Message-ID: <20090603140742.GA22953@tango.0pointer.de>
Date:	Wed, 3 Jun 2009 16:07:43 +0200
From:	Lennart Poettering <mzxreary@...inter.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scheduler: introduce SCHED_RESET_ON_FORK scheduling
	policy flag, Second try

On Fri, 29.05.09 10:38, Lennart Poettering (mzxreary@...inter.de) wrote:

> This patch introduces a new flag SCHED_RESET_ON_FORK which can be passed
> to the kernel via sched_setscheduler(), ORed in the policy parameter. If
> set this will make sure that when the process forks a) the scheduling
> priority is reset to DEFAULT_PRIO if it was higher and b) the scheduling
> policy is reset to SCHED_NORMAL if it was either SCHED_FIFO or SCHED_RR.

[...]

> This current patch compiles but is not otherwise tested. For now, I am
> sending this primarily as a request for comments. So please, I'd love to
> hear your comments!

I have now done some testing to make sure it actually works as
advertised. Everything seems to be fine. For those interested here's a
little test program that verifies that RR scheduling is properly
removed from the child process but is kept enabled in the parent process:

http://0pointer.de/public/reset-on-fork.c
 
Ingo, how can I bribe you into taking this patch, or at least
commenting on it?

Thanks,

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/           GnuPG 0x1A015CC4
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