linux-kernel - Re: [patch] sched: accurate user accounting

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Date:	Sun, 25 Mar 2007 18:39:23 +1000
From:	Con Kolivas <kernel@...ivas.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux list <linux-kernel@...r.kernel.org>, malc <av1474@...tv.ru>,
	zwane@...radead.org, ck list <ck@....kolivas.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch] sched: accurate user accounting

On Sunday 25 March 2007 17:51, Ingo Molnar wrote:
> * Con Kolivas <kernel@...ivas.org> wrote:
> > For an rsdl 0.33 patched kernel. Comments? Overhead worth it?
>
> we want to do this - and we should do this to the vanilla scheduler
> first and check the results. I've back-merged the patch to before RSDL
> and have tested it - find the patch below. Vale, could you try this
> patch against a 2.6.21-rc4-ish kernel and re-test your testcase?

Great. That should fix a lot of misconceptions about cpu usage and HZ.

However-

> +/*
> + * Some helpers for converting nanosecond timing to jiffy resolution
> + */
> +#define NS_TO_JIFFIES(TIME)   ((TIME) / (1000000000 / HZ))
> +#define JIFFIES_TO_NS(TIME)   ((TIME) * (1000000000 / HZ))
> +

This hunk is already in mainline so it will be double defined now.

Thanks.

-- 
-ck
-
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