linux-kernel - Re: [PATCH v4 1/5] sched: rework of sched

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Message-ID: <20140418105601.GU11182@twins.programming.kicks-ass.net>
Date:	Fri, 18 Apr 2014 12:56:01 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	tony.luck@...el.com, fenghua.yu@...el.com, schwidefsky@...ibm.com,
	cmetcalf@...era.com, benh@...nel.crashing.org,
	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	dietmar.eggemann@....com, preeti@...ux.vnet.ibm.com,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH v4 1/5] sched: rework of sched_domain topology definition

On Fri, Apr 11, 2014 at 11:44:37AM +0200, Vincent Guittot wrote:
> We replace the old way to configure the scheduler topology with a new method
> which enables a platform to declare additionnal level (if needed).
> 
> We still have a default topology table definition that can be used by platform
> that don't want more level than the SMT, MC, CPU and NUMA ones. This table can
> be overwritten by an arch which either wants to add new level where a load
> balance make sense like BOOK or powergating level or wants to change the flags
> configuration of some levels.
> 
> For each level, we need a function pointer that returns cpumask for each cpu,
> a function pointer that returns the flags for the level and a name. Only flags
> that describe topology, can be set by an architecture. The current topology
> flags are:
>  SD_SHARE_CPUPOWER
>  SD_SHARE_PKG_RESOURCES
>  SD_NUMA
>  SD_ASYM_PACKING
> 
> Then, each level must be a subset on the next one. The build sequence of the
> sched_domain will take care of removing useless levels like those with 1 CPU
> and those with the same CPU span and no more relevant information for
> load balancing than its childs.
> 
> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> Reviewed-by: Preeti U Murthy <preeti@...ux.vnet.ibm.com>

On x86_64 defconfig this gets me:

kernel/sched/core.c: In function 'sched_init_numa':
kernel/sched/core.c:6197:4: warning: initialization makes pointer from integer without a cast [enabled by default]
kernel/sched/core.c:6197:4: warning: (near initialization for '(anonymous).sd_flags') [enabled by default]

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