From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Mike Galbraith <efault@gmx.de>, Andi Kleen <ak@suse.de>,
Christopher Friesen <cfriesen@nortel.com>,
linux-kernel@vger.kernel.org
Subject: Re: sched_clock() uses are broken
Date: Sun, 7 May 2006 13:43:07 +0100 [thread overview]
Message-ID: <20060507124307.GA20443@flint.arm.linux.org.uk> (raw)
In-Reply-To: <445DE925.9010006@yahoo.com.au>
On Sun, May 07, 2006 at 10:33:41PM +1000, Nick Piggin wrote:
> Mike Galbraith wrote:
> >On Wed, 2006-05-03 at 03:07 +1000, Nick Piggin wrote:
> >
> >>Other problem is that some people didn't RTFM and have started trying to
> >>use it for precise accounting :(
> >
> >
> >Are you talking about me perchance? I don't really care about precision
> >_that_ much, though I certainly do want to tighten timeslice accounting.
>
> No, sched_clock is fine to be used in CPU scheduling choices, which are
> heuristic anyway (although strictly speaking, even using it for timeslicing
> within a single CPU could cause slight unfairness).
Except maybe if it rolls over every 178 seconds, which is my original
point. Maybe someone could comment on my initial patch sent 5 days
ago?
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
next prev parent reply other threads:[~2006-05-07 12:43 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
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 [this message]
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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