From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Russell King <rmk+lkml@arm.linux.org.uk>
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, 07 May 2006 22:56:16 +1000 [thread overview]
Message-ID: <445DEE70.10807@yahoo.com.au> (raw)
In-Reply-To: <20060507124307.GA20443@flint.arm.linux.org.uk>
Russell King wrote:
> On Sun, May 07, 2006 at 10:33:41PM +1000, Nick Piggin wrote:
>
>>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?
Well yes that's true. I meant the "sched_clock interface as defined". Now
there are obviously issues (including the one you raised) that makes the
sched_clock interface unreasonable to implement.
I stand by my first reply to your comment WRT the API. Seems like most of
the rest of the debate was unrelated or concerning implementation details.
kernel/sched.c patches implementing the new API would get an ack from me.
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2006-05-07 12:56 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
2006-05-07 12:56 ` Nick Piggin [this message]
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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