Re: [patch V2 08/10] timer: Implement the hierarchical pull model

[Peter Zijlstra]

On Tue, Apr 18, 2017 at 01:11:10PM +0200, Thomas Gleixner wrote:
> +struct tmigr_group {
> +	raw_spinlock_t		lock;
> +	unsigned int		active;
> +	unsigned int		migrator;
> +	struct timerqueue_head	events;
> +	struct tmigr_event	groupevt;
> +	struct tmigr_group	*parent;
> +	cpumask_var_t		cpus;
> +	struct list_head	list;
> +	unsigned int		level;
> +	unsigned int		numa_node;
> +	unsigned int		num_childs;
> +};

If you place the cpumask at the end, as a 0 sized array, you can avoid a
second allocation.