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From: Chris Friesen <cfriesen@nortel.com>
To: "Patrik Hägglund" <patrik.hagglund@bredband.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: SCHED_RR/SCHED_FIFO and kernel threads?
Date: Thu, 16 Jun 2005 09:48:53 -0600	[thread overview]
Message-ID: <42B19F65.6000102@nortel.com> (raw)
In-Reply-To: <42B199FF.5010705@bredband.net>

Patrik Hägglund wrote:

> Kernel threads seems to generally be scheduled in the SCHED_OTHER class 
> (with the 'migration' thread as an exception).

This is on purpose.  The idea is that realtime processes get all the 
time they request.  If the kernel threads are interrupting the realtime 
app, then the latency of the realtime app is degraded.

> As I see it, "kernel activity" shall not be starved by user-space 
> processes. Therefore, I was very suprised by this behaviour when I saw 
> it in 2.6.11.

If you want specific kernel threads to take priority, you can always 
manually make then SCHED_RR/SCHED_FIFO yourself.

Chris

  reply	other threads:[~2005-06-16 15:49 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-06-16 15:25 SCHED_RR/SCHED_FIFO and kernel threads? Patrik Hägglund
2005-06-16 15:48 ` Chris Friesen [this message]
2005-06-17  6:38   ` Patrik Hägglund
2005-06-17 12:37     ` Steven Rostedt
2005-06-18  8:14       ` Patrik Hägglund
2005-06-21 22:15         ` Patrik Hägglund
2005-06-21 22:18         ` Patrik Hägglund
2005-06-22  0:13           ` Lee Revell
2005-06-16 16:01 ` Lee Revell

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