From: Andi Kleen <ak@suse.de>
To: "Christopher Friesen" <cfriesen@nortel.com>
Cc: Russell King <rmk+lkml@arm.linux.org.uk>, linux-kernel@vger.kernel.org
Subject: Re: sched_clock() uses are broken
Date: Tue, 2 May 2006 18:59:18 +0200 [thread overview]
Message-ID: <200605021859.18948.ak@suse.de> (raw)
In-Reply-To: <44578EB9.8050402@nortel.com>
On Tuesday 02 May 2006 18:54, Christopher Friesen wrote:
> Andi Kleen wrote:
>
> > Agreed it's a problem, but probably a small one. At worst you'll get
> > a small scheduling hickup every half year, which should be hardly
> > that big an issue.
>
> Presumably this would be bad for soft-realtime embedded things. Set-top
> boxes, etc.
SCHED_RR/FIFO are not affected. AFAIK it's only used by the interactivity
detector in the normal scheduler. Worst case that happens is that a
process is not detected to be interactive when it should once, which
gives it only a small penalty. On the next time slice everything will be ok again.
-Andi
next prev parent reply other threads:[~2006-05-02 17:01 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-02 13:29 sched_clock() uses are broken Russell King
2006-05-02 14:21 ` Nick Piggin
2006-05-02 16:43 ` Andi Kleen
2006-05-02 16:50 ` Russell King
2006-05-02 17:01 ` Andi Kleen
2006-05-02 17:18 ` Nicolas Pitre
2006-05-02 18:55 ` Russell King
2006-05-02 19:05 ` Nicolas Pitre
2006-05-02 19:08 ` Russell King
2006-05-02 19:23 ` Nicolas Pitre
2006-05-02 21:35 ` Russell King
2006-05-02 17:15 ` Nicolas Pitre
2006-05-04 3:50 ` George Anzinger
2006-05-04 14:18 ` Nicolas Pitre
2006-05-02 16:54 ` Christopher Friesen
2006-05-02 16:59 ` Andi Kleen [this message]
2006-05-02 17:07 ` Nick Piggin
2006-05-03 7:09 ` Mike Galbraith
2006-05-03 7:40 ` Andi Kleen
2006-05-03 9:11 ` Mike Galbraith
2006-05-03 9:16 ` Andi Kleen
2006-05-03 9:31 ` Mike Galbraith
2006-05-07 12:33 ` Nick Piggin
2006-05-07 12:43 ` Russell King
2006-05-07 12:56 ` Nick Piggin
2006-05-07 13:00 ` Nick Piggin
2006-05-07 13:18 ` Russell King
2006-05-07 13:30 ` Nick Piggin
2006-05-07 13:55 ` Russell King
2006-05-07 14:04 ` Nick Piggin
2006-05-07 16:03 ` Andi Kleen
2006-05-07 16:53 ` Russell King
2006-05-07 17:52 ` Mike Galbraith
2006-05-07 17:37 ` Mike Galbraith
2006-05-07 17:32 ` Mike Galbraith
2006-05-08 4:14 ` Mike Galbraith
2006-05-08 4:37 ` Mike Galbraith
2006-05-08 4:46 ` Nick Piggin
2006-05-08 5:24 ` Mike Galbraith
2006-05-08 5:30 ` Nick Piggin
2006-05-04 20:02 ` Florian Paul Schmidt
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