linux-kernel - Re: [PATCH 07/20] Simplify the check on whether cpusets are a factor or not

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Date:	Mon, 23 Feb 2009 17:14:25 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Linux Memory Management List <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>
Subject: Re: [PATCH 07/20] Simplify the check on whether cpusets are a factor
 or not

> +#ifdef CONFIG_CPUSETS
> +	/* Determine in advance if the cpuset checks will be needed */
> +	if ((alloc_flags & ALLOC_CPUSET) && unlikely(number_of_cpusets > 1))
> +		alloc_cpuset = 1;
> +#endif
> +
>  zonelist_scan:
>  	/*
>  	 * Scan zonelist, looking for a zone with enough free.
> @@ -1420,8 +1427,8 @@ zonelist_scan:
>  		if (NUMA_BUILD && zlc_active &&
>  			!zlc_zone_worth_trying(zonelist, z, allowednodes))
>  				continue;
> -		if ((alloc_flags & ALLOC_CPUSET) &&
> -			!cpuset_zone_allowed_softwall(zone, gfp_mask))
> +		if (alloc_cpuset)
> +			if (!cpuset_zone_allowed_softwall(zone, gfp_mask))

I think you can call __cpuset_zone_allowed_softwall() which won't
check number_of_cpusets, and note you should also define an empty
noop __xxx() for !CONFIG_CPUSETS.

>  				goto try_next_zone;
>  
>  		if (!(alloc_flags & ALLOC_NO_WATERMARKS)) {
--
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