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From: Robert Love <rml@tech9.net>
To: joe.korty@ccur.com
Cc: torvalds@osdl.org, akpm@digeo.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] protect migration/%d etc from sched_setaffinity
Date: 31 Jul 2003 16:02:29 -0700	[thread overview]
Message-ID: <1059692548.931.329.camel@localhost> (raw)
In-Reply-To: <20030731224604.GA24887@tsunami.ccur.com>

On Thu, 2003-07-31 at 15:46, Joe Korty wrote:

> Lock out users from changing the cpu affinity of those per-cpu system
> daemons which cannot survive such a change, such as migration/%d.
> 
> Passes basic handtest of sched_setaffinity(2) on various locked and
> unlocked processes on a i386, otherwise untested except by eyeball.
> 
> Except for one line in i386, no arch needed any changes to support
> this patch.

I have been wondering what to do about processor affinity and kernel
threads. I just concluded "only root can change it, and we can let root
stab herself if she really wants to."

But if this is really an issue, why not just do:

	ret = -EINVAL;
	if (!p->mm)
		goto out_unlock;

in sys_sched_setaffinity ?

	Robert Love



  parent reply	other threads:[~2003-07-31 22:55 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-31 22:46 [PATCH] protect migration/%d etc from sched_setaffinity Joe Korty
2003-07-31 22:47 ` Andrew Morton
2003-07-31 23:11   ` Joe Korty
2003-07-31 23:17     ` Andrew Morton
2003-07-31 23:41       ` Robert Love
2003-08-01  0:01       ` Joe Korty
2003-07-31 23:02 ` Robert Love [this message]
2003-07-31 23:06   ` Joe Korty
2003-07-31 23:18     ` Robert Love
2003-07-31 23:16       ` Joe Korty
2003-07-31 23:27         ` Robert Love
2003-07-31 23:26           ` Joe Korty
2003-07-31 23:18       ` [OT] " J.A. Magallon
2003-07-31 23:37         ` Robert Love
2003-08-01 11:09           ` Eric W. Biederman
2003-08-01 16:15             ` Jamie Lokier
2003-08-01 17:31               ` Eric W. Biederman
2003-08-01 17:55                 ` Jamie Lokier
2003-08-01 18:39                   ` Sean Estabrooks
2003-08-01 17:37             ` Robert Love
     [not found] <20030731224604.GA24887@tsunami.ccur.com.suse.lists.linux.kernel>
2003-07-31 23:17 ` Andi Kleen
2003-07-31 23:30   ` Joe Korty
2003-08-01 10:26 Mikael Pettersson

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