linux-kernel - Re: Issue with SCHED

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Message-ID: <4BF1AC51.7080108@nortel.com>
Date:	Mon, 17 May 2010 14:51:29 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Xianghua Xiao <xiaoxianghua@...il.com>
CC:	Con Kolivas <kernel@...ivas.org>,
	Suresh Rajashekara <suresh.raj+linuxomap@...il.com>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Issue with SCHED_FIFO app

On 05/12/2010 09:16 PM, Xianghua Xiao wrote:

> I'm unsure if the newest "top" (or /proc/PID/stat) reports the correct
> cpu usage when CFS/BFS is used, as you mentioned it seems failed to do
> that. I will try to stress the system and see who fails first under
> same workload, maybe that's the only way to compare cpu usage between
> 2.6.18rt vs 2.6.33rt, for now.

If you turn on scheduler debugging, then /proc/sched_debug gives
accurate information using the scheduler clock (at least with CFS, not
sure about BFS).

Chris
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