Re: [patch] sched: fix sched domain degenerate

[Siddha, Suresh B]

On Fri, Apr 15, 2005 at 11:03:20PM +1000, Nick Piggin wrote:
> Index: linux-2.6/kernel/sched.c
> ===================================================================
> --- linux-2.6.orig/kernel/sched.c	2005-04-15 22:52:25.000000000 +1000
> +++ linux-2.6/kernel/sched.c	2005-04-15 22:58:54.000000000 +1000
> @@ -4844,7 +4844,14 @@ static int __devinit sd_parent_degenerat
>  	/* WAKE_BALANCE is a subset of WAKE_AFFINE */
>  	if (cflags & SD_WAKE_AFFINE)
>  		pflags &= ~SD_WAKE_BALANCE;
> -	if ((~sd->flags) & parent->flags)
> +	/* Flags needing groups don't count if only 1 group in parent */
> +	if (parent->groups == parent->groups->next) {
> +		pflags &= ~(SD_LOAD_BALANCE |
> +				SD_BALANCE_NEWIDLE |
> +				SD_BALANCE_FORK |
> +				SD_BALANCE_EXEC);
> +	}

This patch works fine and I like this fix. But should n't we be adding 
SD_WAKE_AFFINE and SD_WAKE_BALANCE to this list?

And about SD_BALANCE_FORK, now that we have multi level sbe/sbf, we should 
add this flag to SD_CPU/SIBLING_INIT too..

thanks,
suresh
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