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.