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From: Tim Hockin <thockin@hockin.org>
To: "Nicolas Castagné" <nicolas.castagne@imag.fr>
Cc: linux-kernel@vger.kernel.org
Subject: Re: a few question on threads affinity and CPU shielding.
Date: Mon, 1 Dec 2003 05:49:19 -0800	[thread overview]
Message-ID: <20031201134919.GA10663@hockin.org> (raw)
In-Reply-To: <D7F95611-2425-11D8-9C79-000393C76CA6@imag.fr>

On Mon, Dec 01, 2003 at 06:43:16PM +0100, Nicolas Castagné wrote:
> I  was very pleased that some patches for controlling CPU affinities  
> were merged in the 2.5 (and 2.6) releases of the kernel.
> 
> Where may I find precisions on the patches that are now included ?

> - is there also a patch to shield cpu against the scheduler ?

I have a patch around that does this (against RedHat's backported O(1)).
Forward porting it should be no more difficult that creating it in the first
place :)  I was waiting until after 2.6.x was more stable to offer it.

> - is there also a patch to shield cpu against all interruptions  
> (especially hard clock interrups) ?

This could be added to my patch.

What my patch added was a sched_setprocstate() syscall, which lets you set a
CPU's run state.  Currently I support:

ENABLED - run any task
RESTRICTED - run only tasks with (cpus_allowed == 1 << cpu)
ISOLATED - run only tasks with
	(cpus_allowed == 1 << cpu && cpus_allowed_mask == 1 << cpu)

Tim

  reply	other threads:[~2003-12-01 17:47 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-12-01 17:43 a few question on threads affinity and CPU shielding Nicolas Castagné
2003-12-01 13:49 ` Tim Hockin [this message]
2003-12-02 18:57 ` Dimitri Sivanich

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