linux-kernel - Re: [RFC PATCH 5/8] sched: introduce common topology level init function

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Date:	Fri, 20 Dec 2013 15:04:51 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	dietmar.eggemann@....com
Cc:	mingo@...hat.com, vincent.guittot@...aro.org,
	morten.rasmussen@....com, chris.redpath@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 5/8] sched: introduce common topology level init
 function

> +/*
> + * SD_flags allowed in topology descriptions.
> + *
> + * SD_SHARE_CPUPOWER      - describes SMT topologies
> + * SD_SHARE_PKG_RESOURCES - describes shared caches
> + * SD_NUMA                - describes NUMA topologies
> + *
> + * Odd one out:
> + * SD_ASYM_PACKING        - describes SMT quirks
> + *
> + * SD_PREFER_SIBLING      - describes preference for sibling domain
> + */
> +#define TOPOLOGY_SD_FLAGS         \
> +	(SD_SHARE_CPUPOWER |      \
> +	 SD_SHARE_PKG_RESOURCES | \
> +	 SD_NUMA |                \
> +	 SD_ASYM_PACKING |        \
> +	 SD_PREFER_SIBLING)

See SD_PREFER_SIBLING is behavioural, the exact kinda thing we want to
keep out of this mask,
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