linux-kernel - Re: [RFC][PATCH 00/18] Increase resolution of load weights

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Message-ID: <20110428121244.GA26851@linux.vnet.ibm.com>
Date:	Thu, 28 Apr 2011 17:42:44 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>
Cc:	Nikhil Rao <ncrao@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Turner <pjt@...gle.com>, Mike Galbraith <efault@....de>,
	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 00/18] Increase resolution of load weights

On Thu, Apr 28, 2011 at 05:18:27PM +0530, Nikunj A. Dadhania wrote:
> --- kernel/sched.c.orig	2011-04-28 16:34:24.000000000 +0530
> +++ kernel/sched.c	2011-04-28 16:36:29.000000000 +0530
> @@ -1336,7 +1336,7 @@ calc_delta_mine(unsigned long delta_exec
>  			lw->inv_weight = 1 + (WMULT_CONST - w/2) / (w + 1);
>  	}
> 
> -	tmp = (u64)delta_exec * weight;
> +	tmp = (u64)delta_exec * (weight >> SCHED_LOAD_RESOLUTION);

Should we be fixing inv_weight rather to account for SCHED_LOAD_RESOLUTION here?

- vatsa
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