linux-kernel - Re: [patch] CFS scheduler, -v14

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Message-ID: <20070529101947.GA12620@linux.vnet.ibm.com>
Date:	Tue, 29 May 2007 15:49:47 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	pranith-kumar_d@...torg.com, Andi Kleen <andi@...stfloor.org>
Subject: Re: [patch] CFS scheduler, -v14

Hi, Ingo,

> +static clock_t task_utime(struct task_struct *p)
> +{
> +	/*
> +	 * Use CFS's precise accounting, if available:
> +	 */
> +	if (!has_rt_policy(p) && !(sysctl_sched_load_smoothing & 128))
> +		return nsec_to_clock_t(p->sum_exec_runtime);


I wonder if this leads to data truncation, p->sum_exec_runtime is
unsigned long long and clock_t is long (on all architectures from what
my cscope shows me). I have my other patch ready on top of this. I'll
post it out soon.

> +
> +	return cputime_to_clock_t(p->utime);
> +}
> +

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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