From: Mike Galbraith <efault@gmx.de>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andi Kleen <ak@suse.de>,
Christopher Friesen <cfriesen@nortel.com>,
Russell King <rmk+lkml@arm.linux.org.uk>,
linux-kernel@vger.kernel.org
Subject: Re: sched_clock() uses are broken
Date: Wed, 03 May 2006 09:09:15 +0200 [thread overview]
Message-ID: <1146640155.7526.27.camel@homer> (raw)
In-Reply-To: <445791D3.9060306@yahoo.com.au>
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.
Given that most people are going to end up using the pm_timer anyway, I
don't see the point of even having a sched_clock(). If it's jiffy
resolution, it's useless. If it's wildly inaccurate (as it is in the
SMP case, monotonicity issues aside) it's more than useless.
-Mike
next prev parent reply other threads:[~2006-05-03 7:08 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 [this message]
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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