linux-kernel - Re: [PATCH] fix for sched_clock() when using jiffies

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Date:	Sat, 9 May 2009 00:04:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ron <ron@...ian.org>
Cc:	mingo@...e.hu, a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix for sched_clock() when using jiffies

On Sat, 9 May 2009 13:35:37 +0930 Ron <ron@...ian.org> wrote:

>  All 'real'
> sched_clock implementations (empirically) count from 0, except this
> default one.

Well you live and learn.

Yup, we should make the toy sched_clock() match the fancy ones.

otoh, sched_clock() should do the INTITAL_JIFFIES offsetting as well,
because there are probably callers of sched_clock() who are buggy in
the presence of sched_clock()-return-value wraparound.

otooh, sched_clock() wraparound takes nearly 500 years so we can
afford to wait until linux-2.7.x to fix this.

I'll go off and find your original patch.  This was all a difficult way of
writing the changelog ;)
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